!8791 add style transfer android demo

From: @sishuikang
Reviewed-by: @zhanghaibo5,@zhang_xue_tong
Signed-off-by: @zhanghaibo5

model_zoo/official/lite/posenet/app/build.gradle

@@ -46,7 +46,7 @@ android {
 apply from:'download.gradle'
 
 dependencies {
-    implementation fileTree(dir: "libs", include: ["*.jar"])
+    implementation fileTree(dir: "libs", include: ["*.aar"])
     implementation 'androidx.appcompat:appcompat:1.2.0'
     implementation 'androidx.constraintlayout:constraintlayout:2.0.4'
     implementation 'androidx.legacy:legacy-support-v4:1.0.0'
@@ -54,6 +54,4 @@ dependencies {
     androidTestImplementation 'androidx.test.ext:junit:1.1.2'
     androidTestImplementation 'androidx.test.espresso:espresso-core:3.3.0'
 
-    implementation(name: 'mindspore-lite-1.0.1', ext: 'aar')
-
 }

model_zoo/official/lite/style_transfer/.gitignore

@@ -0,0 +1,14 @@
+*.iml
+.gradle
+/local.properties
+/.idea/caches
+/.idea/libraries
+/.idea/modules.xml
+/.idea/workspace.xml
+/.idea/navEditor.xml
+/.idea/assetWizardSettings.xml
+.DS_Store
+/build
+/captures
+.externalNativeBuild
+.cxx

model_zoo/official/lite/style_transfer/app/.gitignore

@@ -0,0 +1 @@
+/build

model_zoo/official/lite/style_transfer/app/build.gradle

@@ -0,0 +1,62 @@
+apply plugin: 'com.android.application'
+apply from: 'download.gradle'
+
+android {
+    compileSdkVersion 30
+    buildToolsVersion "30.0.1"
+
+    defaultConfig {
+        applicationId "com.mindspore.styletransferdemo"
+        minSdkVersion 21
+        targetSdkVersion 30
+        versionCode 1
+        versionName "1.0"
+
+        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
+    }
+
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
+        }
+    }
+    aaptOptions {
+        noCompress "ms"
+    }
+
+    lintOptions {
+        checkReleaseBuilds false
+        // Or, if you prefer, you can continue to check for errors in release builds,
+        // but continue the build even when errors are found:
+        abortOnError false
+    }
+
+    repositories {
+        google()
+        jcenter()
+        flatDir {
+            dirs 'libs'
+        }
+    }
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_1_8
+    }
+}
+
+
+dependencies {
+    implementation fileTree(dir: "libs", include: ["*.aar"])
+    implementation 'androidx.legacy:legacy-support-v4:1.0.0'
+    implementation 'androidx.recyclerview:recyclerview:1.1.0'
+
+    implementation 'androidx.appcompat:appcompat:1.2.0'
+    implementation 'androidx.constraintlayout:constraintlayout:2.0.4'
+    testImplementation 'junit:junit:4.12'
+    androidTestImplementation 'androidx.test.ext:junit:1.1.2'
+    androidTestImplementation 'androidx.test.espresso:espresso-core:3.3.0'
+
+    implementation 'com.github.bumptech.glide:glide:4.11.0'
+    annotationProcessor 'com.github.bumptech.glide:compiler:4.11.0'
+}

model_zoo/official/lite/style_transfer/app/download.gradle

@@ -0,0 +1,88 @@
+/**
+ * To download necessary library from HuaWei server.
+ * Including mindspore-lite .so file, minddata-lite .so file and model file.
+ * The libraries can be downloaded manually.
+ */
+def mindsporeLite_Version = "mindspore-lite-maven-1.0.1"
+def targetPredictModelFile = "src/main/assets/style_predict_quant.ms"
+def targetTransferModelFile = "src/main/assets/style_transfer_quant.ms"
+def modelPredictDownloadUrl = "https://download.mindspore.cn/model_zoo/official/lite/style_lite/style_predict_quant.ms"
+def modelTransferDownloadUrl = "https://download.mindspore.cn/model_zoo/official/lite/style_lite/style_transfer_quant.ms"
+def mindsporeLiteDownloadUrl = "https://ms-release.obs.cn-north-4.myhuaweicloud.com/1.0.1/lite/java/${mindsporeLite_Version}.zip"
+def mindSporeLibrary = "libs/${mindsporeLite_Version}.zip"
+def cleantargetMindSporeInclude = "libs"
+def targetMindSporeInclude = "libs/"
+
+
+task downloadPredictModelFile(type: DownloadUrlTask) {
+    doFirst {
+        println "Downloading ${modelPredictDownloadUrl}"
+    }
+    sourceUrl = "${modelPredictDownloadUrl}"
+    target = file("${targetPredictModelFile}")
+}
+
+task downloadTransferModelFile(type: DownloadUrlTask) {
+    doFirst {
+        println "Downloading ${modelTransferDownloadUrl}"
+    }
+    sourceUrl = "${modelTransferDownloadUrl}"
+    target = file("${targetTransferModelFile}")
+}
+
+
+task downloadMindSporeLibrary(type: DownloadUrlTask) {
+    doFirst {
+        println "Downloading ${mindsporeLiteDownloadUrl}"
+    }
+    sourceUrl = "${mindsporeLiteDownloadUrl}"
+    target = file("${mindSporeLibrary}")
+}
+
+task unzipMindSporeInclude(type: Copy, dependsOn: ['downloadMindSporeLibrary']) {
+    doFirst {
+        println "Unzipping ${mindSporeLibrary}"
+    }
+    from zipTree("${mindSporeLibrary}")
+    into "${targetMindSporeInclude}"
+}
+
+task cleanUnusedmindsporeFiles(type: Delete, dependsOn: ['unzipMindSporeInclude']) {
+    delete fileTree("${cleantargetMindSporeInclude}").matching {
+        include "*.zip"
+    }
+}
+
+if (file("libs/mindspore-lite-1.0.1.aar").exists()){
+    downloadMindSporeLibrary.enabled = false
+    unzipMindSporeInclude.enabled = false
+    cleanUnusedmindsporeFiles.enabled = false
+}
+
+
+if (file("src/main/assets/style_transfer_quant.ms").exists()){
+    downloadTransferModelFile.enabled = false
+}
+
+if (file("src/main/assets/style_predict_quant.ms").exists()){
+    downloadPredictModelFile.enabled = false
+}
+
+preBuild.dependsOn downloadPredictModelFile
+preBuild.dependsOn downloadTransferModelFile
+preBuild.dependsOn downloadMindSporeLibrary
+preBuild.dependsOn unzipMindSporeInclude
+preBuild.dependsOn cleanUnusedmindsporeFiles
+
+class DownloadUrlTask extends DefaultTask {
+    @Input
+    String sourceUrl
+
+    @OutputFile
+    File target
+
+    @TaskAction
+    void download() {
+        ant.get(src: sourceUrl, dest: target)
+    }
+}

model_zoo/official/lite/style_transfer/app/proguard-rules.pro

@@ -0,0 +1,21 @@
+# Add project specific ProGuard rules here.
+# You can control the set of applied configuration files using the
+# proguardFiles setting in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile

model_zoo/official/lite/style_transfer/app/src/androidTest/java/com/mindspore/styletransferdemo/ExampleInstrumentedTest.java

@@ -0,0 +1,26 @@
+package com.mindspore.styletransferdemo;
+
+import android.content.Context;
+
+import androidx.test.platform.app.InstrumentationRegistry;
+import androidx.test.ext.junit.runners.AndroidJUnit4;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import static org.junit.Assert.*;
+
+/**
+ * Instrumented test, which will execute on an Android device.
+ *
+ * @see <a href="http://d.android.com/tools/testing">Testing documentation</a>
+ */
+@RunWith(AndroidJUnit4.class)
+public class ExampleInstrumentedTest {
+    @Test
+    public void useAppContext() {
+        // Context of the app under test.
+        Context appContext = InstrumentationRegistry.getInstrumentation().getTargetContext();
+        assertEquals("com.mindspore.styletransferdemo", appContext.getPackageName());
+    }
+}

model_zoo/official/lite/style_transfer/app/src/main/AndroidManifest.xml

@@ -0,0 +1,39 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="com.mindspore.styletransferdemo">
+
+    <uses-permission android:name="android.permission.CAMERA" />
+    <uses-permission android:name="android.permission.WRITE_INTERNAL_STORAGE" />
+    <uses-permission android:name="android.permission.READ_INTERNAL_STORAGE" />
+    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
+    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
+    <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEM" />
+    <uses-permission android:name="android.permission.READ_PHONE_STATE" />
+    <uses-permission android:name="android.permission.REQUEST_INSTALL_PACKAGES" />
+
+    <application
+        android:allowBackup="true"
+        android:icon="@mipmap/ic_launcher"
+        android:label="@string/app_name"
+        android:requestLegacyExternalStorage="true"
+        android:roundIcon="@mipmap/ic_launcher_round"
+        android:supportsRtl="true"
+        android:theme="@style/AppTheme">
+        <activity
+            android:name=".TestActivity"
+            android:screenOrientation="portrait"
+            android:theme="@style/Theme.AppCompat.Light.NoActionBar">
+
+        </activity>
+        <activity
+            android:name=".MainActivity"
+            android:screenOrientation="portrait"
+            android:theme="@style/Theme.AppCompat.Light.NoActionBar">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+
+</manifest>

model_zoo/official/lite/style_transfer/app/src/main/java/com/mindspore/styletransferdemo/BitmapUtils.java

@@ -0,0 +1,151 @@
+/**
+ * Copyright 2020 Huawei Technologies Co., Ltd
+ * <p>
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * <p>
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * <p>
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.mindspore.styletransferdemo;
+
+import android.app.Activity;
+import android.database.Cursor;
+import android.graphics.Bitmap;
+import android.graphics.BitmapFactory;
+import android.graphics.Matrix;
+import android.media.ExifInterface;
+import android.net.Uri;
+import android.provider.MediaStore;
+import android.util.Log;
+
+import java.io.IOException;
+import java.io.InputStream;
+
+public class BitmapUtils {
+    private static final String TAG = "BitmapUtils";
+
+    public static void recycleBitmap(Bitmap... bitmaps) {
+        for (Bitmap bitmap : bitmaps) {
+            if (bitmap != null && !bitmap.isRecycled()) {
+                bitmap.recycle();
+                bitmap = null;
+            }
+        }
+    }
+
+    private static String getImagePath(Activity activity, Uri uri) {
+        String[] projection = {MediaStore.Images.Media.DATA};
+        Cursor cursor = activity.managedQuery(uri, projection, null, null, null);
+        int columnIndex = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
+        cursor.moveToFirst();
+        return cursor.getString(columnIndex);
+    }
+
+    public static Bitmap loadFromPath(Activity activity, int id, int width, int height) {
+        BitmapFactory.Options options = new BitmapFactory.Options();
+        options.inJustDecodeBounds = true;
+        InputStream is = activity.getResources().openRawResource(id);
+        int sampleSize = calculateInSampleSize(options, width, height);
+        options.inSampleSize = sampleSize;
+        options.inJustDecodeBounds = false;
+        return zoomImage(BitmapFactory.decodeStream(is), width, height);
+    }
+
+    public static Bitmap loadFromPath(Activity activity, Uri uri, int width, int height) {
+        BitmapFactory.Options options = new BitmapFactory.Options();
+        options.inJustDecodeBounds = true;
+
+        String path = getImagePath(activity, uri);
+        BitmapFactory.decodeFile(path, options);
+        int sampleSize = calculateInSampleSize(options, width, height);
+        options.inSampleSize = sampleSize;
+        options.inJustDecodeBounds = false;
+
+        Bitmap bitmap = zoomImage(BitmapFactory.decodeFile(path, options), width, height);
+        return rotateBitmap(bitmap, getRotationAngle(path));
+    }
+
+    private static int calculateInSampleSize(BitmapFactory.Options options, int reqWidth, int reqHeight) {
+        final int width = options.outWidth;
+        final int height = options.outHeight;
+        int inSampleSize = 1;
+
+        if (height > reqHeight || width > reqWidth) {
+            // Calculate height and required height scale.
+            final int heightRatio = Math.round((float) height / (float) reqHeight);
+            // Calculate width and required width scale.
+            final int widthRatio = Math.round((float) width / (float) reqWidth);
+            // Take the larger of the values.
+            inSampleSize = heightRatio > widthRatio ? heightRatio : widthRatio;
+        }
+        return inSampleSize;
+    }
+
+    // Scale pictures to screen width.
+    private static Bitmap zoomImage(Bitmap imageBitmap, int targetWidth, int maxHeight) {
+        float scaleFactor =
+                Math.max(
+                        (float) imageBitmap.getWidth() / (float) targetWidth,
+                        (float) imageBitmap.getHeight() / (float) maxHeight);
+        Bitmap resizedBitmap =
+                Bitmap.createScaledBitmap(
+                        imageBitmap,
+                        (int) (imageBitmap.getWidth() / scaleFactor),
+                        (int) (imageBitmap.getHeight() / scaleFactor),
+                        true);
+
+        return resizedBitmap;
+    }
+
+    /**
+     * Get the rotation angle of the photo.
+     *
+     * @param path photo path.
+     * @return angle.
+     */
+    public static int getRotationAngle(String path) {
+        int rotation = 0;
+        try {
+            ExifInterface exifInterface = new ExifInterface(path);
+            int orientation = exifInterface.getAttributeInt(ExifInterface.TAG_ORIENTATION, ExifInterface.ORIENTATION_NORMAL);
+            switch (orientation) {
+                case ExifInterface.ORIENTATION_ROTATE_90:
+                    rotation = 90;
+                    break;
+                case ExifInterface.ORIENTATION_ROTATE_180:
+                    rotation = 180;
+                    break;
+                case ExifInterface.ORIENTATION_ROTATE_270:
+                    rotation = 270;
+                    break;
+                default:
+                    break;
+            }
+        } catch (IOException e) {
+            Log.e(TAG, "Failed to get rotation: " + e.getMessage());
+        }
+        return rotation;
+    }
+
+    public static Bitmap rotateBitmap(Bitmap bitmap, int angle) {
+        Matrix matrix = new Matrix();
+        matrix.postRotate(angle);
+        Bitmap result = null;
+        try {
+            result = Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), matrix, true);
+        } catch (OutOfMemoryError e) {
+            Log.e(TAG, "Failed to rotate bitmap: " + e.getMessage());
+        }
+        if (result == null) {
+            return bitmap;
+        }
+        return result;
+    }
+}

model_zoo/official/lite/style_transfer/app/src/main/java/com/mindspore/styletransferdemo/ImageUtils.java

@@ -0,0 +1,201 @@
+/**
+ * Copyright 2020 Huawei Technologies Co., Ltd
+ * <p>
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * <p>
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * <p>
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.mindspore.styletransferdemo;
+
+import android.content.Context;
+import android.graphics.Bitmap;
+import android.graphics.BitmapFactory;
+import android.graphics.Color;
+import android.graphics.Matrix;
+import android.graphics.RectF;
+
+import androidx.annotation.NonNull;
+import androidx.exifinterface.media.ExifInterface;
+
+import java.io.File;
+import java.io.IOException;
+import java.io.InputStream;
+import java.nio.ByteBuffer;
+import java.nio.ByteOrder;
+
+public class ImageUtils {
+
+    private static Matrix decodeExifOrientation(int orientation) {
+        Matrix matrix = new Matrix();
+
+        switch (orientation) {
+            case ExifInterface.ORIENTATION_NORMAL:
+            case ExifInterface.ORIENTATION_UNDEFINED:
+                break;
+            case ExifInterface.ORIENTATION_ROTATE_90:
+                matrix.postRotate(90F);
+                break;
+            case ExifInterface.ORIENTATION_ROTATE_180:
+                matrix.postRotate(180F);
+                break;
+            case ExifInterface.ORIENTATION_ROTATE_270:
+                matrix.postRotate(270F);
+                break;
+            case ExifInterface.ORIENTATION_FLIP_HORIZONTAL:
+                matrix.postScale(-1F, 1F);
+                break;
+            case ExifInterface.ORIENTATION_FLIP_VERTICAL:
+                matrix.postScale(1F, -1F);
+                break;
+            case ExifInterface.ORIENTATION_TRANSPOSE:
+                matrix.postScale(-1F, 1F);
+                matrix.postRotate(270F);
+                break;
+            case ExifInterface.ORIENTATION_TRANSVERSE:
+                matrix.postScale(-1F, 1F);
+                matrix.postRotate(90F);
+                break;
+
+            default:
+                try {
+                    new IllegalArgumentException("Invalid orientation: " + orientation);
+                } catch (Throwable throwable) {
+                    throwable.printStackTrace();
+                }
+        }
+        return matrix;
+    }
+
+    public void setExifOrientation(@NonNull String filePath, @NonNull String value) {
+        try {
+            ExifInterface exif = new ExifInterface(filePath);
+            exif.setAttribute(ExifInterface.TAG_ORIENTATION, value);
+            exif.saveAttributes();
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+    }
+
+    public int computeExifOrientation(int rotationDegrees, boolean mirrored) {
+        if (rotationDegrees == 0 && !mirrored) {
+            return ExifInterface.ORIENTATION_NORMAL;
+        } else if (rotationDegrees == 0 && mirrored) {
+            return ExifInterface.ORIENTATION_FLIP_HORIZONTAL;
+        } else if (rotationDegrees == 180 && !mirrored) {
+            return ExifInterface.ORIENTATION_ROTATE_180;
+        } else if (rotationDegrees == 180 && mirrored) {
+            return ExifInterface.ORIENTATION_FLIP_VERTICAL;
+        } else if (rotationDegrees == 90 && !mirrored) {
+            return ExifInterface.ORIENTATION_ROTATE_90;
+        } else if (rotationDegrees == 90 && mirrored) {
+            return ExifInterface.ORIENTATION_TRANSPOSE;
+        } else if (rotationDegrees == 270 && !mirrored) {
+            return ExifInterface.ORIENTATION_ROTATE_270;
+        } else if (rotationDegrees == 270 && mirrored) {
+            return ExifInterface.ORIENTATION_TRANSVERSE;
+        } else {
+            return ExifInterface.ORIENTATION_UNDEFINED;
+        }
+    }
+
+    public static Bitmap decodeBitmap(@NonNull File file) {
+        Bitmap finalBitmap = null;
+        try {
+            ExifInterface exif = new ExifInterface(file.getAbsolutePath());
+
+            Matrix transformation = decodeExifOrientation(exif.getAttributeInt(ExifInterface.TAG_ORIENTATION, ExifInterface.ORIENTATION_ROTATE_90));
+
+            BitmapFactory.Options options = new BitmapFactory.Options();
+            Bitmap bitmap = BitmapFactory.decodeFile(file.getAbsolutePath(), options);
+            finalBitmap = Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), transformation, true);
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+        return finalBitmap;
+    }
+
+
+    public static Bitmap scaleBitmapAndKeepRatio(Bitmap targetBmp, int reqHeightInPixels, int reqWidthInPixels) {
+        if (targetBmp.getHeight() == reqHeightInPixels && targetBmp.getWidth() == reqWidthInPixels) {
+            return targetBmp;
+        }
+
+        Matrix matrix = new Matrix();
+        matrix.setRectToRect(new RectF(0f, 0f,
+                targetBmp.getWidth(),
+                targetBmp.getHeight()
+        ), new RectF(0f, 0f,
+                reqWidthInPixels,
+                reqHeightInPixels
+        ), Matrix.ScaleToFit.FILL);
+
+        return Bitmap.createBitmap(
+                targetBmp, 0, 0,
+                targetBmp.getWidth(),
+                targetBmp.getHeight(), matrix, true
+        );
+    }
+
+    public static Bitmap loadBitmapFromResources(Context context, String path) {
+        try {
+            InputStream inputStream = context.getAssets().open(path);
+            return BitmapFactory.decodeStream(inputStream);
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+        return null;
+    }
+
+    public static ByteBuffer bitmapToByteBuffer(Bitmap bitmapIn, int width, int height, float mean, float std) {
+        Bitmap bitmap = scaleBitmapAndKeepRatio(bitmapIn, width, height);
+        ByteBuffer inputImage = ByteBuffer.allocateDirect(1 * width * height * 3 * 4);
+        inputImage.order(ByteOrder.nativeOrder());
+        inputImage.rewind();
+        int[] intValues = new int[width * height];
+        bitmap.getPixels(intValues, 0, width, 0, 0, width, height);
+        int pixel = 0;
+        for (int y = 0; y < height; y++) {
+            for (int x = 0; x < width; x++) {
+                int value = intValues[pixel++];
+                inputImage.putFloat(((float) (value >> 16 & 255) - mean) / std);
+                inputImage.putFloat(((float) (value >> 8 & 255) - mean) / std);
+                inputImage.putFloat(((float) (value & 255) - mean) / std);
+            }
+        }
+        inputImage.rewind();
+        return inputImage;
+    }
+
+
+    public static Bitmap convertArrayToBitmap(float[][][][] imageArray, int imageWidth, int imageHeight) {
+        Bitmap styledImage = Bitmap.createBitmap(imageWidth, imageHeight, Bitmap.Config.ARGB_8888);
+
+        for (int x = 0; x < imageArray[0].length; x++) {
+            for (int y = 0; y < imageArray[0][0].length; y++) {
+
+                int color = Color.rgb((int) (imageArray[0][x][y][0] * (float) 255),
+                        (int) (imageArray[0][x][y][1] * (float) 255),
+                        (int) (imageArray[0][x][y][2] * (float) 255));
+                // this y, x is in the correct order!!!
+                styledImage.setPixel(y, x, color);
+            }
+        }
+        return styledImage;
+    }
+
+    public Bitmap createEmptyBitmap(int imageWidth, int imageHeigth, int color) {
+        Bitmap ret = Bitmap.createBitmap(imageWidth, imageHeigth, Bitmap.Config.RGB_565);
+        if (color != 0) {
+            ret.eraseColor(color);
+        }
+        return ret;
+    }
+}

model_zoo/official/lite/style_transfer/app/src/main/java/com/mindspore/styletransferdemo/MainActivity.java

@@ -0,0 +1,223 @@
+/**
+ * Copyright 2020 Huawei Technologies Co., Ltd
+ * <p>
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * <p>
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * <p>
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.mindspore.styletransferdemo;
+
+import android.Manifest;
+import android.content.Intent;
+import android.content.res.Configuration;
+import android.graphics.Bitmap;
+import android.net.Uri;
+import android.os.Bundle;
+import android.provider.MediaStore;
+import android.text.TextUtils;
+import android.util.Log;
+import android.util.Pair;
+import android.view.View;
+import android.widget.ImageView;
+import android.widget.ProgressBar;
+import android.widget.Toast;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import androidx.appcompat.app.AppCompatActivity;
+import androidx.core.app.ActivityCompat;
+
+import com.bumptech.glide.Glide;
+
+public class MainActivity extends AppCompatActivity implements View.OnClickListener, StyleFragment.OnListFragmentInteractionListener {
+
+    private static final String TAG = "MainActivity";
+
+    private static final int REQUEST_PERMISSION = 1;
+    private static final int RC_CHOOSE_PHOTO = 2;
+
+    private StyleTransferModelExecutor transferModelExecutor;
+
+    private boolean isHasPermssion;
+    private boolean isRunningModel;
+
+    private ImageView imgOrigin, imgStyle, imgResult;
+    private ProgressBar progressResult;
+    private Uri imageUri;
+
+    private Integer maxWidthOfImage;
+    private Integer maxHeightOfImage;
+    private boolean isLandScape;
+
+    private Bitmap originBitmap, styleBitmap;
+    private StyleFragment styleFragment;
+    private String selectedStyle;
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_main);
+        this.isLandScape = getResources().getConfiguration().orientation == Configuration.ORIENTATION_LANDSCAPE;
+        requestPermissions();
+        init();
+    }
+
+    private void init() {
+        imgOrigin = findViewById(R.id.img_origin);
+        imgStyle = findViewById(R.id.img_style);
+        imgResult = findViewById(R.id.img_result);
+        progressResult = findViewById(R.id.progress_circular);
+
+        imgOrigin.setOnClickListener(this);
+        imgStyle.setOnClickListener(this);
+        imgResult.setOnClickListener(this);
+
+        styleFragment = StyleFragment.newInstance();
+        transferModelExecutor = new StyleTransferModelExecutor(this, false);
+    }
+
+    private void requestPermissions() {
+        ActivityCompat.requestPermissions(this,
+                new String[]{Manifest.permission.READ_EXTERNAL_STORAGE, Manifest.permission.WRITE_EXTERNAL_STORAGE,
+                        Manifest.permission.READ_PHONE_STATE, Manifest.permission.CAMERA}, REQUEST_PERMISSION);
+    }
+
+    /**
+     * Authority application result callback
+     */
+    @Override
+    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
+        if (REQUEST_PERMISSION == requestCode) {
+            isHasPermssion = true;
+        }
+    }
+
+
+    @Override
+    public void onClick(View view) {
+        if (view.getId() == R.id.img_origin) {
+            if (isHasPermssion) {
+                openGallay();
+            } else {
+                requestPermissions();
+            }
+        } else if (view.getId() == R.id.img_style) {
+            if (!isRunningModel) {
+                styleFragment.show(getSupportFragmentManager(), TAG);
+            }
+        }
+    }
+
+    private void openGallay() {
+        Intent intentToPickPic = new Intent(Intent.ACTION_PICK, null);
+        intentToPickPic.setDataAndType(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, "image/*");
+        startActivityForResult(intentToPickPic, RC_CHOOSE_PHOTO);
+    }
+
+    @Override
+    protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
+        super.onActivityResult(requestCode, resultCode, data);
+
+        if (RC_CHOOSE_PHOTO == requestCode && null != data && null != data.getData()) {
+            if (data != null) {
+                this.imageUri = data.getData();
+                showOriginImage();
+            }
+        } else {
+            finish();
+        }
+    }
+
+    private void showOriginImage() {
+        Pair<Integer, Integer> targetedSize = this.getTargetSize();
+        int targetWidth = targetedSize.first;
+        int maxHeight = targetedSize.second;
+        originBitmap = BitmapUtils.loadFromPath(MainActivity.this, imageUri, targetWidth, maxHeight);
+        // Determine how much to scale down the image.
+        Log.i(TAG, "resized image size width:" + originBitmap.getWidth() + ",height: " + originBitmap.getHeight());
+
+        if (originBitmap != null) {
+            Glide.with(this).load(originBitmap).into(imgOrigin);
+        }
+    }
+
+
+    @Override
+    public void onListFragmentInteraction(String item) {
+        this.selectedStyle = item;
+        styleFragment.dismiss();
+        startRunningModel();
+    }
+
+    private void startRunningModel() {
+        if (!isRunningModel && !TextUtils.isEmpty(selectedStyle)) {
+            styleBitmap = ImageUtils.loadBitmapFromResources(this, getUriFromAssetThumb(selectedStyle));
+            Glide.with(this)
+                    .load(styleBitmap)
+                    .into(imgStyle);
+
+            if (originBitmap == null) {
+                Toast.makeText(this, "Please select an original picture first", Toast.LENGTH_SHORT).show();
+                return;
+            }
+            progressResult.setVisibility(View.VISIBLE);
+            isRunningModel = true;
+            ModelExecutionResult result = transferModelExecutor.execute(originBitmap, styleBitmap);
+            Glide.with(this).load(result.getStyledImage()).into(imgResult);
+            progressResult.setVisibility(View.GONE);
+            isRunningModel = false;
+        } else {
+            Toast.makeText(this, "Previous Model still running", Toast.LENGTH_SHORT).show();
+        }
+    }
+
+    private String getUriFromAssetThumb(String thumb) {
+        return "thumbnails/" + thumb;
+    }
+
+    // Returns max width of image.
+    private Integer getMaxWidthOfImage() {
+        if (this.maxWidthOfImage == null) {
+            if (this.isLandScape) {
+                this.maxWidthOfImage = ((View) this.imgOrigin.getParent()).getHeight();
+            } else {
+                this.maxWidthOfImage = ((View) this.imgOrigin.getParent()).getWidth();
+            }
+        }
+        return this.maxWidthOfImage;
+    }
+
+    // Returns max height of image.
+    private Integer getMaxHeightOfImage() {
+        if (this.maxHeightOfImage == null) {
+            if (this.isLandScape) {
+                this.maxHeightOfImage = ((View) this.imgOrigin.getParent()).getWidth();
+            } else {
+                this.maxHeightOfImage = ((View) this.imgOrigin.getParent()).getHeight();
+            }
+        }
+        return this.maxHeightOfImage;
+    }
+
+    // Gets the targeted size(width / height).
+    private Pair<Integer, Integer> getTargetSize() {
+        Integer targetWidth;
+        Integer targetHeight;
+        Integer maxWidth = this.getMaxWidthOfImage();
+        Integer maxHeight = this.getMaxHeightOfImage();
+        targetWidth = this.isLandScape ? maxHeight : maxWidth;
+        targetHeight = this.isLandScape ? maxWidth : maxHeight;
+        Log.i(TAG, "height:" + targetHeight + ",width:" + targetWidth);
+        return new Pair<>(targetWidth, targetHeight);
+    }
+
+
+}

model_zoo/official/lite/style_transfer/app/src/main/java/com/mindspore/styletransferdemo/ModelExecutionResult.java

@@ -0,0 +1,112 @@
+/**
+ * Copyright 2020 Huawei Technologies Co., Ltd
+ * <p>
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * <p>
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * <p>
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.mindspore.styletransferdemo;
+
+import android.graphics.Bitmap;
+
+public class ModelExecutionResult {
+    private Bitmap styledImage;
+    private long preProcessTime;
+    private long stylePredictTime;
+    private long styleTransferTime;
+    private long postProcessTime;
+    private long totalExecutionTime;
+    private String executionLog;
+    private String errorMessage;
+
+
+    public ModelExecutionResult(Bitmap styledImage, long preProcessTime, long stylePredictTime, long styleTransferTime, long postProcessTime, long totalExecutionTime, String executionLog) {
+        this.styledImage = styledImage;
+        this.preProcessTime = preProcessTime;
+        this.stylePredictTime = stylePredictTime;
+        this.styleTransferTime = styleTransferTime;
+        this.postProcessTime = postProcessTime;
+        this.totalExecutionTime = totalExecutionTime;
+        this.executionLog = executionLog;
+    }
+
+    public Bitmap getStyledImage() {
+        return styledImage;
+    }
+
+    public ModelExecutionResult setStyledImage(Bitmap styledImage) {
+        this.styledImage = styledImage;
+        return this;
+    }
+
+    public long getPreProcessTime() {
+        return preProcessTime;
+    }
+
+    public ModelExecutionResult setPreProcessTime(long preProcessTime) {
+        this.preProcessTime = preProcessTime;
+        return this;
+    }
+
+    public long getStylePredictTime() {
+        return stylePredictTime;
+    }
+
+    public ModelExecutionResult setStylePredictTime(long stylePredictTime) {
+        this.stylePredictTime = stylePredictTime;
+        return this;
+    }
+
+    public long getStyleTransferTime() {
+        return styleTransferTime;
+    }
+
+    public ModelExecutionResult setStyleTransferTime(long styleTransferTime) {
+        this.styleTransferTime = styleTransferTime;
+        return this;
+    }
+
+    public long getPostProcessTime() {
+        return postProcessTime;
+    }
+
+    public ModelExecutionResult setPostProcessTime(long postProcessTime) {
+        this.postProcessTime = postProcessTime;
+        return this;
+    }
+
+    public long getTotalExecutionTime() {
+        return totalExecutionTime;
+    }
+
+    public ModelExecutionResult setTotalExecutionTime(long totalExecutionTime) {
+        this.totalExecutionTime = totalExecutionTime;
+        return this;
+    }
+
+    public String getExecutionLog() {
+        return executionLog;
+    }
+
+    public ModelExecutionResult setExecutionLog(String executionLog) {
+        this.executionLog = executionLog;
+        return this;
+    }
+
+    public String getErrorMessage() {
+        return errorMessage;
+    }
+
+    public ModelExecutionResult setErrorMessage(String errorMessage) {
+        this.errorMessage = errorMessage;
+        return this;
+    }
+}

model_zoo/official/lite/style_transfer/app/src/main/java/com/mindspore/styletransferdemo/StyleFragment.java

@@ -0,0 +1,92 @@
+/**
+ * Copyright 2020 Huawei Technologies Co., Ltd
+ * <p>
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * <p>
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * <p>
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.mindspore.styletransferdemo;
+
+import android.content.Context;
+import android.os.Bundle;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+
+import androidx.annotation.NonNull;
+import androidx.fragment.app.DialogFragment;
+import androidx.fragment.app.Fragment;
+import androidx.recyclerview.widget.GridLayoutManager;
+import androidx.recyclerview.widget.RecyclerView;
+
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+
+/**
+ * A simple {@link Fragment} subclass.
+ * Use the {@link StyleFragment#newInstance} factory method to
+ * create an instance of this fragment.
+ */
+public class StyleFragment extends DialogFragment {
+
+    private OnListFragmentInteractionListener listener;
+
+    public StyleFragment() {
+        // Required empty public constructor
+    }
+
+
+    public static StyleFragment newInstance() {
+        StyleFragment fragment = new StyleFragment();
+        return fragment;
+    }
+
+
+    @Override
+    public View onCreateView(LayoutInflater inflater, ViewGroup container,
+                             Bundle savedInstanceState) {
+        View view = inflater.inflate(R.layout.fragment_style, container, false);
+        List<String> styles = new ArrayList<>();
+        try {
+            styles.addAll(Arrays.asList(getActivity().getAssets().list("thumbnails")));
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+
+        if (view instanceof RecyclerView) {
+            GridLayoutManager gridLayoutManager = new GridLayoutManager(getContext(), 3);
+            ((RecyclerView) view).setLayoutManager(gridLayoutManager);
+            ((RecyclerView) view).setAdapter(new StyleRecyclerViewAdapter(getActivity(), styles, listener));
+        }
+
+        return view;
+    }
+
+
+    @Override
+    public void onAttach(@NonNull Context context) {
+        super.onAttach(context);
+        if (context instanceof OnListFragmentInteractionListener) {
+            this.listener = (StyleFragment.OnListFragmentInteractionListener) context;
+        }
+    }
+
+    public void onDetach() {
+        super.onDetach();
+        this.listener = null;
+    }
+
+    public interface OnListFragmentInteractionListener {
+        void onListFragmentInteraction(String item);
+    }
+}

model_zoo/official/lite/style_transfer/app/src/main/java/com/mindspore/styletransferdemo/StyleRecyclerViewAdapter.java

@@ -0,0 +1,111 @@
+/**
+ * Copyright 2020 Huawei Technologies Co., Ltd
+ * <p>
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * <p>
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * <p>
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.mindspore.styletransferdemo;
+
+import android.content.Context;
+import android.net.Uri;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.ImageView;
+
+import androidx.annotation.NonNull;
+import androidx.recyclerview.widget.RecyclerView;
+
+import com.bumptech.glide.Glide;
+
+import java.util.List;
+
+public class StyleRecyclerViewAdapter extends RecyclerView.Adapter<StyleRecyclerViewAdapter.StyleItemViewHolder> {
+
+    private View.OnClickListener mOnClickListener;
+    private List<String> stylesList;
+    private Context context;
+    private StyleFragment.OnListFragmentInteractionListener mListener;
+
+    public StyleRecyclerViewAdapter(Context context, List<String> stylesList, StyleFragment.OnListFragmentInteractionListener mListener) {
+        this.stylesList = stylesList;
+        this.context = context;
+        this.mListener = mListener;
+
+        this.mOnClickListener = new View.OnClickListener() {
+            @Override
+            public void onClick(View view) {
+
+            }
+        };
+
+        this.mOnClickListener = (View.OnClickListener) (new View.OnClickListener() {
+            public final void onClick(View v) {
+
+                if (v.getTag() != null && v.getTag() instanceof String) {
+                    mListener.onListFragmentInteraction(String.valueOf(v.getTag()));
+                }
+            }
+        });
+    }
+
+    @NonNull
+    @Override
+    public StyleItemViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
+        View view = LayoutInflater.from(context)
+                .inflate(R.layout.image_item, parent, false);
+        return new StyleItemViewHolder(view);
+    }
+
+    @Override
+    public void onBindViewHolder(@NonNull StyleItemViewHolder holder, int position) {
+        String imagePath = stylesList.get(position);
+        Glide.with(context).
+                load(Uri.parse("file:///android_asset/thumbnails/" + imagePath)).
+                centerInside().
+                into(holder.getImageView());
+
+        View view = holder.getMView();
+        view.setTag(imagePath);
+        view.setOnClickListener(this.mOnClickListener);
+    }
+
+
+    @Override
+    public int getItemCount() {
+        return stylesList == null ? 0 : stylesList.size();
+    }
+
+
+    public class StyleItemViewHolder extends RecyclerView.ViewHolder {
+        private ImageView imageView;
+        private final View mView;
+
+        public final ImageView getImageView() {
+            return this.imageView;
+        }
+
+        public final void setImageView(ImageView imageView) {
+            this.imageView = imageView;
+        }
+
+        public final View getMView() {
+            return this.mView;
+        }
+
+        public StyleItemViewHolder(View mView) {
+            super(mView);
+            this.mView = mView;
+            this.imageView = mView.findViewById(R.id.image_view);
+        }
+    }
+}

model_zoo/official/lite/style_transfer/app/src/main/java/com/mindspore/styletransferdemo/TestActivity.java

@@ -0,0 +1,52 @@
+/**
+ * Copyright 2020 Huawei Technologies Co., Ltd
+ * <p>
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * <p>
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * <p>
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.mindspore.styletransferdemo;
+
+import android.graphics.Bitmap;
+import android.graphics.BitmapFactory;
+import android.os.Bundle;
+import android.widget.ImageView;
+
+import androidx.appcompat.app.AppCompatActivity;
+
+import com.bumptech.glide.Glide;
+
+public class TestActivity extends AppCompatActivity {
+
+    private ImageView img1, img2, img3;
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_test);
+
+        img1 = findViewById(R.id.img1);
+        img2 = findViewById(R.id.img2);
+        img3 = findViewById(R.id.img3);
+
+        Bitmap bitmap1 = BitmapFactory.decodeResource(getResources(), R.drawable.person);
+        Glide.with(this).load(bitmap1).into(img1);
+
+        Bitmap bitmap2 =
+                ImageUtils.loadBitmapFromResources(this, "thumbnails/style3.jpg");
+        Glide.with(this).load(bitmap2).into(img2);
+
+
+        StyleTransferModelExecutor transferModelExecutor = new StyleTransferModelExecutor(this, false);
+        ModelExecutionResult result = transferModelExecutor.execute(bitmap1, bitmap2);
+        Glide.with(this).load(result.getStyledImage()).into(img3);
+    }
+}