|
|
| 行17: |
行17: |
| | mopub | | mopub |
| | https://github.com/mopub/mopub-android-sdk/blob/master/mopub-sdk/mopub-sdk-base/src/main/java/com/mopub/common/DiskLruCache.java | | https://github.com/mopub/mopub-android-sdk/blob/master/mopub-sdk/mopub-sdk-base/src/main/java/com/mopub/common/DiskLruCache.java |
| − | ==bitmapサンプル== | + | ==使い方サンプル== |
| − | https://developer.android.com/topic/performance/graphics/cache-bitmap#java
| + | |
| − | | + | |
| | <pre> | | <pre> |
| − | private DiskLruCache mDiskLruCache;
| |
| − | private final Object mDiskCacheLock = new Object();
| |
| − | private boolean mDiskCacheStarting = true;
| |
| − | private static final int DISK_CACHE_SIZE = 1024 * 1024 * 10; // 10MB
| |
| − | private static final String DISK_CACHE_SUBDIR = "thumbnails";
| |
| | | | |
| − | @Override
| + | </pre> |
| − | protected void onCreate(Bundle savedInstanceState) {
| + | |
| − | ...
| + | |
| − | // Initialize memory cache
| + | |
| − | ...
| + | |
| − | // Initialize disk cache on background thread
| + | |
| − | File cacheDir = getDiskCacheDir(this, DISK_CACHE_SUBDIR);
| + | |
| − | new InitDiskCacheTask().execute(cacheDir);
| + | |
| − | ...
| + | |
| − | }
| + | |
| | | | |
| − | class InitDiskCacheTask extends AsyncTask<File, Void, Void> {
| + | 参考:mopubでの使い方 |
| − | @Override
| + | https://github.com/mopub/mopub-android-sdk/blob/master/mopub-sdk/mopub-sdk-base/src/main/java/com/mopub/common/CacheService.java |
| − | protected Void doInBackground(File... params) {
| + | |
| − | synchronized (mDiskCacheLock) {
| + | |
| − | File cacheDir = params[0];
| + | |
| − | mDiskLruCache = DiskLruCache.open(cacheDir, DISK_CACHE_SIZE);
| + | |
| − | mDiskCacheStarting = false; // Finished initialization
| + | |
| − | mDiskCacheLock.notifyAll(); // Wake any waiting threads
| + | |
| − | }
| + | |
| − | return null;
| + | |
| − | }
| + | |
| − | }
| + | |
| − | | + | |
| − | class BitmapWorkerTask extends AsyncTask<Integer, Void, Bitmap> {
| + | |
| − | ...
| + | |
| − | // Decode image in background.
| + | |
| − | @Override
| + | |
| − | protected Bitmap doInBackground(Integer... params) {
| + | |
| − | final String imageKey = String.valueOf(params[0]);
| + | |
| − | | + | |
| − | // Check disk cache in background thread
| + | |
| − | Bitmap bitmap = getBitmapFromDiskCache(imageKey);
| + | |
| − | | + | |
| − | if (bitmap == null) { // Not found in disk cache
| + | |
| − | // Process as normal
| + | |
| − | final Bitmap bitmap = decodeSampledBitmapFromResource(
| + | |
| − | getResources(), params[0], 100, 100));
| + | |
| − | }
| + | |
| − | | + | |
| − | // Add final bitmap to caches
| + | |
| − | addBitmapToCache(imageKey, bitmap);
| + | |
| − | | + | |
| − | return bitmap;
| + | |
| − | }
| + | |
| − | ...
| + | |
| − | }
| + | |
| − | | + | |
| − | public void addBitmapToCache(String key, Bitmap bitmap) {
| + | |
| − | // Add to memory cache as before
| + | |
| − | if (getBitmapFromMemCache(key) == null) {
| + | |
| − | mMemoryCache.put(key, bitmap);
| + | |
| − | }
| + | |
| − | | + | |
| − | // Also add to disk cache
| + | |
| − | synchronized (mDiskCacheLock) {
| + | |
| − | if (mDiskLruCache != null && mDiskLruCache.get(key) == null) {
| + | |
| − | mDiskLruCache.put(key, bitmap);
| + | |
| − | }
| + | |
| − | }
| + | |
| − | }
| + | |
| − | | + | |
| − | public Bitmap getBitmapFromDiskCache(String key) {
| + | |
| − | synchronized (mDiskCacheLock) {
| + | |
| − | // Wait while disk cache is started from background thread
| + | |
| − | while (mDiskCacheStarting) {
| + | |
| − | try {
| + | |
| − | mDiskCacheLock.wait();
| + | |
| − | } catch (InterruptedException e) {}
| + | |
| − | }
| + | |
| − | if (mDiskLruCache != null) {
| + | |
| − | return mDiskLruCache.get(key);
| + | |
| − | }
| + | |
| − | }
| + | |
| − | return null;
| + | |
| − | }
| + | |
| − | | + | |
| − | // Creates a unique subdirectory of the designated app cache directory. Tries to use external
| + | |
| − | // but if not mounted, falls back on internal storage.
| + | |
| − | public static File getDiskCacheDir(Context context, String uniqueName) {
| + | |
| − | // Check if media is mounted or storage is built-in, if so, try and use external cache dir
| + | |
| − | // otherwise use internal cache dir
| + | |
| − | final String cachePath =
| + | |
| − | Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState()) ||
| + | |
| − | !isExternalStorageRemovable() ? getExternalCacheDir(context).getPath() :
| + | |
| − | context.getCacheDir().getPath();
| + | |
| − | | + | |
| − | return new File(cachePath + File.separator + uniqueName);
| + | |
| − | }
| + | |
| − | </pre>
| + | |
