Java ThumbnailUtils类代码示例

import android.media.ThumbnailUtils; //导入依赖的package包/类
public static float[] getPixels(Bitmap bitmap, int[] intValues, float[] floatValues) {
    if (bitmap.getWidth() != IMAGE_SIZE || bitmap.getHeight() != IMAGE_SIZE) {
        // rescale the bitmap if needed
        bitmap = ThumbnailUtils.extractThumbnail(bitmap, IMAGE_SIZE, IMAGE_SIZE);
    }

    bitmap.getPixels(intValues, 0, bitmap.getWidth(), 0, 0, bitmap.getWidth(), bitmap.getHeight());

    // Preprocess the image data from 0-255 int to normalized float based
    // on the provided parameters.
    for (int i = 0; i < intValues.length; ++i) {
        final int val = intValues[i];
        floatValues[i * 3] = (((val >> 16) & 0xFF) - IMAGE_MEAN) / IMAGE_STD;
        floatValues[i * 3 + 1] = (((val >> 8) & 0xFF) - IMAGE_MEAN) / IMAGE_STD;
        floatValues[i * 3 + 2] = ((val & 0xFF) - IMAGE_MEAN) / IMAGE_STD;
    }
    return floatValues;
}
 

import android.media.ThumbnailUtils; //导入依赖的package包/类
@Override
protected Bitmap doInBackground(Void... params) {
	Bitmap bitmap = null;
	try {
		bitmap = ThumbnailUtils.createVideoThumbnail(mImageKey, Thumbnails.FULL_SCREEN_KIND);

		if (bitmap != null) {
			bitmap = Bitmap.createScaledBitmap(bitmap, mMaxWidth, mMaxWidth, false);
			addBitmapToCache(mImageKey, bitmap);
			return bitmap;
		}
		return null;
	} catch (Exception e) {
		if (e != null) {
			e.printStackTrace();
		}
		return null;
	}
}
 

import android.media.ThumbnailUtils; //导入依赖的package包/类
@Before
public void setUp() throws Exception {
  MockitoAnnotations.initMocks(this);
  mExecutor = new TestExecutorService(new FakeClock());
  mLocalVideoThumbnailProducer = new LocalVideoThumbnailProducer(
      mExecutor,
      RuntimeEnvironment.application.getContentResolver());
  mFile = new File(RuntimeEnvironment.application.getExternalFilesDir(null), TEST_FILENAME);

  mockStatic(ThumbnailUtils.class);
  mProducerContext = new SettableProducerContext(
      mImageRequest,
      mRequestId,
      mProducerListener,
      mock(Object.class),
      ImageRequest.RequestLevel.FULL_FETCH,
      false,
      false,
      Priority.MEDIUM);
  when(mImageRequest.getSourceFile()).thenReturn(mFile);
}
 

import android.media.ThumbnailUtils; //导入依赖的package包/类
@Test
public void testLocalVideoMicroThumbnailReturnsNull() throws Exception {
  when(mProducerListener.requiresExtraMap(mRequestId)).thenReturn(true);
  when(
      android.media.ThumbnailUtils.createVideoThumbnail(
          mFile.getPath(), MediaStore.Images.Thumbnails.MICRO_KIND))
      .thenReturn(null);
  mLocalVideoThumbnailProducer.produceResults(mConsumer, mProducerContext);
  mExecutor.runUntilIdle();
  verify(mConsumer).onNewResult(null, Consumer.IS_LAST);
  verify(mProducerListener).onProducerStart(mRequestId, PRODUCER_NAME);
  Map<String, String> thumbnailNotFoundMap =
      ImmutableMap.of(LocalVideoThumbnailProducer.CREATED_THUMBNAIL, "false");
  verify(mProducerListener).onProducerFinishWithSuccess(
      mRequestId, PRODUCER_NAME, thumbnailNotFoundMap);
  verify(mProducerListener).onUltimateProducerReached(mRequestId, PRODUCER_NAME, false);
}
 

import android.media.ThumbnailUtils; //导入依赖的package包/类
@Override
public void onDraw(Canvas canvas) {
    if (bitmap != null) {
        int size = Math.min(canvas.getWidth(), canvas.getHeight());
        if (size != this.size) {
            this.size = size;
            bitmap = ThumbnailUtils.extractThumbnail(bitmap, size, size);

            RoundedBitmapDrawable roundedBitmapDrawable = RoundedBitmapDrawableFactory.create(getResources(), bitmap);

            roundedBitmapDrawable.setCornerRadius(size / 2);
            roundedBitmapDrawable.setAntiAlias(true);

            bitmap = ImageUtils.drawableToBitmap(roundedBitmapDrawable);
        }

        canvas.drawBitmap(bitmap, 0, 0, paint);
    }
}
 

import android.media.ThumbnailUtils; //导入依赖的package包/类
/**
 * Constructing a bitmap that contains the given bitmaps(max is three).
 *
 * For given two bitmaps the result will be a half and half bitmap.
 *
 * For given three the result will be a half of the first bitmap and the second
 * half will be shared equally by the two others.
 *
 * @param  bitmaps Array of bitmaps to use for the final image.
 * @param  width width of the final image, A positive number.
 * @param  height height of the final image, A positive number.
 *
 * @return A Bitmap containing the given images.
 * */
@Nullable public static Bitmap getMixImagesBitmap(@Size(min = 1) int width,@Size(min = 1) int height, @NonNull Bitmap...bitmaps){

    if (height == 0 || width == 0) return null;

    if (bitmaps.length == 0) return null;

    Bitmap finalImage = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
    Canvas canvas = new Canvas(finalImage);

    Paint paint = new Paint(Paint.FILTER_BITMAP_FLAG);

    if (bitmaps.length == 2){
        canvas.drawBitmap(ThumbnailUtils.extractThumbnail(bitmaps[0], width/2, height), 0, 0, paint);
        canvas.drawBitmap(ThumbnailUtils.extractThumbnail(bitmaps[1], width/2, height), width/2, 0, paint);
    }
    else{
        canvas.drawBitmap(ThumbnailUtils.extractThumbnail(bitmaps[0], width/2, height), 0, 0, paint);
        canvas.drawBitmap(ThumbnailUtils.extractThumbnail(bitmaps[1], width/2, height/2), width/2, 0, paint);
        canvas.drawBitmap(ThumbnailUtils.extractThumbnail(bitmaps[2], width/2, height/2), width/2, height/2, paint);
    }

    return finalImage;
}
 

import android.media.ThumbnailUtils; //导入依赖的package包/类
public static float[] getPixels(Bitmap bitmap) {
    if (bitmap.getWidth() != IMAGE_SIZE || bitmap.getHeight() != IMAGE_SIZE) {
        // rescale the bitmap if needed
        bitmap = ThumbnailUtils.extractThumbnail(bitmap, IMAGE_SIZE, IMAGE_SIZE);
    }
    int[] intValues = new int[IMAGE_SIZE * IMAGE_SIZE];

    bitmap.getPixels(intValues, 0, bitmap.getWidth(), 0, 0, bitmap.getWidth(), bitmap.getHeight());

    float[] floatValues = new float[IMAGE_SIZE * IMAGE_SIZE * 3];
    // Preprocess the image data from 0-255 int to normalized float based
    // on the provided parameters.
    for (int i = 0; i < intValues.length; ++i) {
        final int val = intValues[i];
        floatValues[i * 3] = (((val >> 16) & 0xFF) - IMAGE_MEAN) / IMAGE_STD;
        floatValues[i * 3 + 1] = (((val >> 8) & 0xFF) - IMAGE_MEAN) / IMAGE_STD;
        floatValues[i * 3 + 2] = ((val & 0xFF) - IMAGE_MEAN) / IMAGE_STD;
    }
    return floatValues;
}
 

import android.media.ThumbnailUtils; //导入依赖的package包/类
/**
 * 从系统媒体库获取图片，视频，音乐，apk文件的缩略图
 *
 * @param context  Context
 * @param mimeType 文件类型
 * @param path     文件路径
 * @param isList   是否为列表模式
 * @return 缩略图
 */
public static Bitmap getThumbFromDb(Context context, String mimeType, String path, boolean isList) {

    int width = isList ? 40 : 104;
    int height = isList ? 40 : 72;
    int thumbnailsValues = MediaStore.Images.Thumbnails.MINI_KIND;
    if (mimeType.startsWith("image")) {
        return ThumbnailUtils.extractThumbnail(getThumbImage(context, path, thumbnailsValues), FeViewUtils.dpToPx(width), FeViewUtils.dpToPx(height));
    } else if (mimeType.startsWith("video")) {
        return ThumbnailUtils.extractThumbnail(getVideoImage(context, path, thumbnailsValues), FeViewUtils.dpToPx(width), FeViewUtils.dpToPx(height));
    } else if (mimeType.startsWith("audio") || mimeType.equals("application/ogg")) {
        return ThumbnailUtils.extractThumbnail(getMusicThumb(path), FeViewUtils.dpToPx(width), FeViewUtils.dpToPx(height));
    } else if (mimeType.equals("application/vnd.android.package-archive")) {
        //app 图标在平铺模式下 56dp  设计规定
        width = isList ? 40 : 56;
        height = isList ? 40 : 56;
        Bitmap bitmap = getLocalApkIcon(context.getPackageManager(), path);
        if (bitmap != null) {
            return FeThumbUtils.scaleBitMap(bitmap, FeViewUtils.dpToPx(width), FeViewUtils.dpToPx(height));
        }

        return null;
    }

    return null;
}
 

import android.media.ThumbnailUtils; //导入依赖的package包/类
public static Bitmap getThumbFromThumbPath(Context ctx, String filePath, int kind) {
    Bitmap bitmap;
    try {
        bitmap = BitmapFactory.decodeFile(filePath);
        bitmap = ThumbnailUtils.extractThumbnail(bitmap, 80, 80,
                ThumbnailUtils.OPTIONS_RECYCLE_INPUT);
    } catch (Exception e) {
        e.printStackTrace();
        return null;
    } catch (OutOfMemoryError o) {
        System.gc();
        try {
            bitmap = createImageThumbnailThrowErrorOrException(ctx,
                    filePath, kind);
            return bitmap;
        } catch (Throwable t) {
            t.printStackTrace();
            return null;
        }
    }
    return bitmap;
}
 

import android.media.ThumbnailUtils; //导入依赖的package包/类
/**
 * 获取图片的缩略图
 *
 * @param imagePath 图片路径
 * @param maxWidth  最大宽度
 * @param maxHeight 最大高度
 * @return 一个bitmap缩略图
 */
public static Bitmap getImageThumbnail(String imagePath, int maxWidth, int maxHeight) {
    Bitmap bitmap;
    BitmapFactory.Options options = new BitmapFactory.Options();
    options.inJustDecodeBounds = true;
    // 获取这个图片的宽和高，注意此处的bitmap为null
    bitmap = BitmapFactory.decodeFile(imagePath, options);
    options.inJustDecodeBounds = false; // 设为 false
    // 计算缩放比
    int h = options.outHeight;
    int w = options.outWidth;
    int beWidth = w / maxWidth;
    int beHeight = h / maxHeight;
    int be = beWidth < beHeight ? beWidth : beHeight;

    if (be <= 0) {
        be = 1;
    }
    options.inSampleSize = be;
    // 重新读入图片，读取缩放后的bitmap，注意这次要把options.inJustDecodeBounds 设为 false
    bitmap = BitmapFactory.decodeFile(imagePath, options);
    // 利用ThumbnailUtils来创建缩略图，这里要指定要缩放哪个Bitmap对象
    bitmap = ThumbnailUtils.extractThumbnail(bitmap, maxWidth, maxHeight,
            ThumbnailUtils.OPTIONS_RECYCLE_INPUT);
    return bitmap;
}
 

import android.media.ThumbnailUtils; //导入依赖的package包/类
private void fadeThumbnailIn(SnippetArticle snippet, Bitmap thumbnail) {
    mImageCallback = null;
    if (thumbnail == null) return; // Nothing to do, we keep the placeholder.

    // We need to crop and scale the downloaded bitmap, as the ImageView we set it on won't be
    // able to do so when using a TransitionDrawable (as opposed to the straight bitmap).
    // That's a limitation of TransitionDrawable, which doesn't handle layers of varying sizes.
    Resources res = mThumbnailView.getResources();
    int targetSize = res.getDimensionPixelSize(R.dimen.snippets_thumbnail_size);
    Bitmap scaledThumbnail = ThumbnailUtils.extractThumbnail(
            thumbnail, targetSize, targetSize, ThumbnailUtils.OPTIONS_RECYCLE_INPUT);

    // Store the bitmap to skip the download task next time we display this snippet.
    snippet.setThumbnailBitmap(scaledThumbnail);

    // Cross-fade between the placeholder and the thumbnail.
    Drawable[] layers = {mThumbnailView.getDrawable(),
            new BitmapDrawable(mThumbnailView.getResources(), scaledThumbnail)};
    TransitionDrawable transitionDrawable = new TransitionDrawable(layers);
    mThumbnailView.setImageDrawable(transitionDrawable);
    transitionDrawable.startTransition(FADE_IN_ANIMATION_TIME_MS);
}
 

import android.media.ThumbnailUtils; //导入依赖的package包/类
private Bitmap getScaledBitmap(Bitmap bitmap, int width, int height) {
    double scale = icon.getScale();

    if (scale <= 1)
        return ThumbnailUtils.extractThumbnail(bitmap, (int) ((2 - scale) * width), (int) ((2 - scale) * height));
    else if (bitmap.getWidth() > 1 && bitmap.getHeight() > 1) {
        int widthMargin = (int) ((scale - 1) * width);
        int heightMargin = (int) ((scale - 1) * height);

        if (widthMargin > 0 && heightMargin > 0) {
            Bitmap source = ThumbnailUtils.extractThumbnail(bitmap, (int) ((2 - scale) * width), (int) ((2 - scale) * height));
            int dWidth = width + widthMargin;
            int dHeight = height + heightMargin;
            bitmap = Bitmap.createBitmap(dWidth, dHeight, bitmap.getConfig());
            Canvas canvas = new Canvas(bitmap);
            canvas.drawBitmap(source, (dWidth - source.getWidth()) / 2, (dHeight - source.getHeight()) / 2, new Paint());
            return bitmap;
        }
    } else if (bitmap.getWidth() > 0 && bitmap.getHeight() > 0)
        return ThumbnailUtils.extractThumbnail(bitmap, width, height);

    return null;
}
 

import android.media.ThumbnailUtils; //导入依赖的package包/类
public static Bitmap getImageThumbnail(String imagePath, int width, int height) {
    BitmapFactory.Options options = new BitmapFactory.Options();
    options.inJustDecodeBounds = true;
    options.inJustDecodeBounds = false;
    int outWidth = options.outWidth;
    int outHeight = options.outHeight;
    int w = outWidth / width;
    int h = outHeight / height;
    int inSampleSize;
    if (w < h) {
        inSampleSize = w;
    } else {
        inSampleSize = h;
    }
    if (inSampleSize <= 0) {
        inSampleSize = 1;
    }
    options.inSampleSize = inSampleSize;
    Bitmap bitmap = BitmapFactory.decodeFile(imagePath, options);
    bitmap = ThumbnailUtils.extractThumbnail(bitmap, width, height,
            ThumbnailUtils.OPTIONS_RECYCLE_INPUT);
    return bitmap;
}
 

import android.media.ThumbnailUtils; //导入依赖的package包/类
@Override
public void onInfo(MediaRecorder mediaRecorder, int what, int extra) {
    if (what == MediaRecorder.MEDIA_RECORDER_INFO_MAX_DURATION_REACHED || what == MediaRecorder.MEDIA_RECORDER_INFO_MAX_FILESIZE_REACHED || what == MediaRecorder.MEDIA_RECORDER_INFO_UNKNOWN) {
        MediaRecorder tempRecorder = recorder;
        recorder = null;
        if (tempRecorder != null) {
            tempRecorder.stop();
            tempRecorder.release();
        }
        if (onVideoTakeCallback != null) {
            final Bitmap bitmap = ThumbnailUtils.createVideoThumbnail(recordedFile, MediaStore.Video.Thumbnails.MINI_KIND);
            AndroidUtilities.runOnUIThread(new Runnable() {
                @Override
                public void run() {
                    if (onVideoTakeCallback != null) {
                        onVideoTakeCallback.onFinishVideoRecording(bitmap);
                        onVideoTakeCallback = null;
                    }
                }
            });
        }
    }
}
 

import android.media.ThumbnailUtils; //导入依赖的package包/类
@Override
public void onInfo(MediaRecorder mediaRecorder, int what, int extra) {
    if (what == MediaRecorder.MEDIA_RECORDER_INFO_MAX_DURATION_REACHED || what == MediaRecorder.MEDIA_RECORDER_INFO_MAX_FILESIZE_REACHED || what == MediaRecorder.MEDIA_RECORDER_INFO_UNKNOWN) {
        MediaRecorder tempRecorder = recorder;
        recorder = null;
        if (tempRecorder != null) {
            tempRecorder.stop();
            tempRecorder.release();
        }
        final Bitmap bitmap = ThumbnailUtils.createVideoThumbnail(recordedFile, MediaStore.Video.Thumbnails.MINI_KIND);
        AndroidUtilities.runOnUIThread(new Runnable() {
            @Override
            public void run() {
                onVideoTakeCallback.onFinishVideoRecording(bitmap);
            }
        });
    }
}