下面列出了android.util.LruCache#get ( ) 实例代码，或者点击链接到github查看源代码，也可以在右侧发表评论。
public Bitmap getPreviewForUri(Attachment attachment, int size, boolean cacheOnly) {
final String key = "attachment_" + attachment.getUuid().toString() + "_" + String.valueOf(size);
final LruCache<String, Bitmap> cache = mXmppConnectionService.getBitmapCache();
Bitmap bitmap = cache.get(key);
if (bitmap != null || cacheOnly) {
return bitmap;
}
DownloadableFile file = new DownloadableFile(attachment.getUri().getPath());
if ("application/pdf".equals(attachment.getMime()) && Compatibility.runsTwentyOne()) {
bitmap = cropCenterSquare(getPDFPreview(file, size), size);
} else if (attachment.getMime() != null && attachment.getMime().startsWith("video/")) {
bitmap = cropCenterSquareVideo(attachment.getUri(), size);
drawOverlay(bitmap, R.drawable.play_video, 0.75f);
} else {
bitmap = cropCenterSquare(attachment.getUri(), size);
if (bitmap != null && "image/gif".equals(attachment.getMime())) {
Bitmap withGifOverlay = bitmap.copy(Bitmap.Config.ARGB_8888, true);
drawOverlay(withGifOverlay, R.drawable.play_gif, 1.0f);
bitmap.recycle();
bitmap = withGifOverlay;
}
}
if (bitmap != null) {
cache.put(key, bitmap);
}
return bitmap;
}
public Bitmap getPreviewForUri(Attachment attachment, int size, boolean cacheOnly) {
final String key = "attachment_" + attachment.getUuid().toString() + "_" + size;
final LruCache<String, Bitmap> cache = mXmppConnectionService.getBitmapCache();
Bitmap bitmap = cache.get(key);
if (bitmap != null || cacheOnly) {
return bitmap;
}
final String mime = attachment.getMime();
if ("application/pdf".equals(mime) && Compatibility.runsTwentyOne()) {
bitmap = cropCenterSquarePdf(attachment.getUri(), size);
drawOverlay(bitmap, paintOverlayBlackPdf(bitmap) ? R.drawable.open_pdf_black : R.drawable.open_pdf_white, 0.75f);
} else if (mime != null && mime.startsWith("video/")) {
bitmap = cropCenterSquareVideo(attachment.getUri(), size);
drawOverlay(bitmap, paintOverlayBlack(bitmap) ? R.drawable.play_video_black : R.drawable.play_video_white, 0.75f);
} else {
bitmap = cropCenterSquare(attachment.getUri(), size);
if (bitmap != null && "image/gif".equals(mime)) {
Bitmap withGifOverlay = bitmap.copy(Bitmap.Config.ARGB_8888, true);
drawOverlay(withGifOverlay, paintOverlayBlack(withGifOverlay) ? R.drawable.play_gif_black : R.drawable.play_gif_white, 1.0f);
bitmap.recycle();
bitmap = withGifOverlay;
}
}
if (bitmap != null) {
cache.put(key, bitmap);
}
return bitmap;
}
public Bitmap getThumbnail(Message message, int size, boolean cacheOnly) throws IOException {
final String uuid = message.getUuid();
final LruCache<String, Bitmap> cache = mXmppConnectionService.getBitmapCache();
Bitmap thumbnail = cache.get(uuid);
if ((thumbnail == null) && (!cacheOnly)) {
synchronized (THUMBNAIL_LOCK) {
thumbnail = cache.get(uuid);
if (thumbnail != null) {
return thumbnail;
}
DownloadableFile file = getFile(message);
final String mime = file.getMimeType();
if ("application/pdf".equals(mime) && Compatibility.runsTwentyOne()) {
thumbnail = getPdfDocumentPreview(file, size);
} else if (mime.startsWith("video/")) {
thumbnail = getVideoPreview(file, size);
} else {
Bitmap fullsize = getFullSizeImagePreview(file, size);
if (fullsize == null) {
throw new FileNotFoundException();
}
thumbnail = resize(fullsize, size);
thumbnail = rotate(thumbnail, getRotation(file));
if (mime.equals("image/gif")) {
Bitmap withGifOverlay = thumbnail.copy(Bitmap.Config.ARGB_8888, true);
drawOverlay(withGifOverlay, paintOverlayBlack(withGifOverlay) ? R.drawable.play_gif_black : R.drawable.play_gif_white, 1.0f);
thumbnail.recycle();
thumbnail = withGifOverlay;
}
}
cache.put(uuid, thumbnail);
}
}
return thumbnail;
}
/**
* 对RecyclerView进行截图
* https://gist.github.com/PrashamTrivedi/809d2541776c8c141d9a
*/
public static Bitmap shotRecyclerView(RecyclerView view) {
RecyclerView.Adapter adapter = view.getAdapter();
Bitmap bigBitmap = null;
if (adapter != null) {
int size = adapter.getItemCount();
int height = 0;
Paint paint = new Paint();
int iHeight = 0;
final int maxMemory = (int) (Runtime.getRuntime().maxMemory() / 1024);
// Use 1/8th of the available memory for this memory cache.
final int cacheSize = maxMemory / 8;
LruCache<String, Bitmap> bitmaCache = new LruCache<>(cacheSize);
for (int i = 0; i < size; i++) {
RecyclerView.ViewHolder holder = adapter.createViewHolder(view, adapter.getItemViewType(i));
adapter.onBindViewHolder(holder, i);
holder.itemView.measure(
View.MeasureSpec.makeMeasureSpec(view.getWidth(), View.MeasureSpec.EXACTLY),
View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED));
holder.itemView.layout(0, 0, holder.itemView.getMeasuredWidth(),
holder.itemView.getMeasuredHeight());
holder.itemView.setDrawingCacheEnabled(true);
holder.itemView.buildDrawingCache();
Bitmap drawingCache = holder.itemView.getDrawingCache();
if (drawingCache != null) {
bitmaCache.put(String.valueOf(i), drawingCache);
}
height += holder.itemView.getMeasuredHeight();
}
bigBitmap = Bitmap.createBitmap(view.getMeasuredWidth(), height, Bitmap.Config.ARGB_8888);
Canvas bigCanvas = new Canvas(bigBitmap);
Drawable lBackground = view.getBackground();
if (lBackground instanceof ColorDrawable) {
ColorDrawable lColorDrawable = (ColorDrawable) lBackground;
int lColor = lColorDrawable.getColor();
bigCanvas.drawColor(lColor);
}
for (int i = 0; i < size; i++) {
Bitmap bitmap = bitmaCache.get(String.valueOf(i));
bigCanvas.drawBitmap(bitmap, 0f, iHeight, paint);
iHeight += bitmap.getHeight();
bitmap.recycle();
}
}
return bigBitmap;
}
public static Bitmap shotRecyclerView(RecyclerView view) {
RecyclerView.Adapter adapter = view.getAdapter();
Bitmap bigBitmap = null;
if (adapter != null) {
int size = adapter.getItemCount();
int height = 0;
Paint paint = new Paint();
int iHeight = 0;
final int maxMemory = (int) (Runtime.getRuntime().maxMemory() / 1024);
// Use 1/8th of the available memory for this memory cache.
final int cacheSize = maxMemory / 8;
LruCache<String, Bitmap> bitmaCache = new LruCache<>(cacheSize);
for (int i = 0; i < size; i++) {
RecyclerView.ViewHolder holder = adapter.createViewHolder(view, adapter.getItemViewType(i));
adapter.onBindViewHolder(holder, i);
holder.itemView.measure(
View.MeasureSpec.makeMeasureSpec(view.getWidth(), View.MeasureSpec.EXACTLY),
View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED));
holder.itemView.layout(0, 0, holder.itemView.getMeasuredWidth(),
holder.itemView.getMeasuredHeight());
holder.itemView.setDrawingCacheEnabled(true);
holder.itemView.buildDrawingCache();
Bitmap drawingCache = holder.itemView.getDrawingCache();
if (drawingCache != null) {
bitmaCache.put(String.valueOf(i), drawingCache);
}
height += holder.itemView.getMeasuredHeight();
}
bigBitmap = Bitmap.createBitmap(view.getMeasuredWidth(), height, Config.ARGB_8888);
Canvas bigCanvas = new Canvas(bigBitmap);
Drawable lBackground = view.getBackground();
if (lBackground instanceof ColorDrawable) {
ColorDrawable lColorDrawable = (ColorDrawable) lBackground;
int lColor = lColorDrawable.getColor();
bigCanvas.drawColor(lColor);
}
for (int i = 0; i < size; i++) {
Bitmap bitmap = bitmaCache.get(String.valueOf(i));
bigCanvas.drawBitmap(bitmap, 0f, iHeight, paint);
iHeight += bitmap.getHeight();
bitmap.recycle();
}
}
return bigBitmap;
}
public static Bitmap shotRecyclerView(RecyclerView view, int itemHeight) {
RecyclerView.Adapter adapter = view.getAdapter();
Bitmap bigBitmap = null;
if (adapter != null) {
int size = adapter.getItemCount();
int height = 0;
Paint paint = new Paint();
int iHeight = 0;
final int maxMemory = (int) (Runtime.getRuntime().maxMemory() / 1024);
// Use 1/8th of the available memory for this memory cache.
final int cacheSize = maxMemory / 8;
LruCache<String, Bitmap> bitmaCache = new LruCache<>(cacheSize);
for (int i = 0; i < size; i++) {
RecyclerView.ViewHolder holder = adapter.createViewHolder(view, adapter.getItemViewType(i));
adapter.onBindViewHolder(holder, i);
holder.itemView.measure(
View.MeasureSpec.makeMeasureSpec(view.getWidth(), View.MeasureSpec.EXACTLY),
View.MeasureSpec.makeMeasureSpec(itemHeight, View.MeasureSpec.EXACTLY));
holder.itemView.layout(0, 0, holder.itemView.getMeasuredWidth(),
holder.itemView.getMeasuredHeight());
holder.itemView.setDrawingCacheEnabled(true);
holder.itemView.buildDrawingCache();
Bitmap drawingCache = holder.itemView.getDrawingCache();
if (drawingCache != null) {
bitmaCache.put(String.valueOf(i), drawingCache);
}
height += holder.itemView.getMeasuredHeight();
}
bigBitmap = Bitmap.createBitmap(view.getMeasuredWidth(), height, Config.ARGB_8888);
Canvas bigCanvas = new Canvas(bigBitmap);
Drawable lBackground = view.getBackground();
if (lBackground instanceof ColorDrawable) {
ColorDrawable lColorDrawable = (ColorDrawable) lBackground;
int lColor = lColorDrawable.getColor();
bigCanvas.drawColor(lColor);
}
for (int i = 0; i < size; i++) {
Bitmap bitmap = bitmaCache.get(String.valueOf(i));
bigCanvas.drawBitmap(bitmap, 0f, iHeight, paint);
iHeight += bitmap.getHeight();
bitmap.recycle();
}
}
return bigBitmap;
}
public Bitmap getThumbnail(Message message, int size, boolean cacheOnly) throws IOException {
// The key for getting a cached thumbnail contains the UUID and the size
// since this method is used for thumbnails of (bigger) normal image messages and (smaller) image message references.
// If only the UUID were used, the first loaded thumbnail would be cached and the next loading
// would get that thumbnail which would have the size of the first cached thumbnail
// possibly leading to undesirable appearance of the displayed thumbnail.
final String key = message.getUuid() + String.valueOf(size);
final String uuid = message.getUuid();
final LruCache<String, Bitmap> cache = mXmppConnectionService.getBitmapCache();
Bitmap thumbnail = cache.get(key);
if ((thumbnail == null) && (!cacheOnly)) {
synchronized (THUMBNAIL_LOCK) {
thumbnail = cache.get(key);
if (thumbnail != null) {
return thumbnail;
}
DownloadableFile file = getFile(message);
final String mime = file.getMimeType();
if ("application/pdf".equals(mime) && Compatibility.runsTwentyOne()) {
thumbnail = getPDFPreview(file, size);
} else if (mime.startsWith("video/")) {
thumbnail = getVideoPreview(file, size);
} else if (mime.startsWith("image/")) {
Bitmap fullsize = getFullsizeImagePreview(file, size);
if (fullsize == null) {
throw new FileNotFoundException();
}
thumbnail = resize(fullsize, size);
thumbnail = rotate(thumbnail, getRotation(file));
if (mime.equals("image/gif")) {
Bitmap withGifOverlay = thumbnail.copy(Bitmap.Config.ARGB_8888, true);
drawOverlay(withGifOverlay, R.drawable.play_gif, 1.0f);
thumbnail.recycle();
thumbnail = withGifOverlay;
}
}
cache.put(key, thumbnail);
}
}
return thumbnail;
}