How to use

getFile

method

in

com.bumptech.glide.disklrucache.DiskLruCache$Value

@Override
public File get(Key key) {
 String safeKey = safeKeyGenerator.getSafeKey(key);
 if (Log.isLoggable(TAG, Log.VERBOSE)) {
  Log.v(TAG, "Get: Obtained: " + safeKey + " for for Key: " + key);
 }
 File result = null;
 try {
  // It is possible that the there will be a put in between these two gets. If so that shouldn't
  // be a problem because we will always put the same value at the same key so our input streams
  // will still represent the same data.
  final DiskLruCache.Value value = getDiskCache().get(safeKey);
  if (value != null) {
   result = value.getFile(0);
  }
 } catch (IOException e) {
  if (Log.isLoggable(TAG, Log.WARN)) {
   Log.w(TAG, "Unable to get from disk cache", e);
  }
 }
 return result;
}

@Override
public File get(Key key) {
  String safeKey = safeKeyGenerator.getSafeKey(key);
  File result = null;
  try {
    //It is possible that the there will be a put in between these two gets. If so that shouldn't be a problem
    //because we will always put the same value at the same key so our input streams will still represent
    //the same data
    final DiskLruCache.Value value = getDiskCache().get(safeKey);
    if (value != null) {
      result = value.getFile(0);
    }
  } catch (IOException e) {
    if (Log.isLoggable(TAG, Log.WARN)) {
      Log.w(TAG, "Unable to get from disk cache", e);
    }
  }
  return result;
}

private Bitmap getBitmap(DiskLruCache.Value value) {
  Bitmap bitmap = null;
  final File file = value.getFile(BITMAP_INDEX);
  if (file != null) {
    BitmapFactory.Options options = new BitmapFactory.Options();
    options.inPreferredConfig = Bitmap.Config.ARGB_8888;
    FileInputStream fileInputStream = null;
    try {
      fileInputStream = new FileInputStream(file);
      bitmap = BitmapFactory.decodeStream(fileInputStream, null, options);
    } catch (FileNotFoundException e) {
      e.printStackTrace();
    } finally {
      if (fileInputStream != null) {
        try {
          fileInputStream.close();
        } catch (IOException e) {
          e.printStackTrace();
        }
      }
    }
  }
  return bitmap;
}

@Override
public File get(Key key) {
 String safeKey = safeKeyGenerator.getSafeKey(key);
 if (Log.isLoggable(TAG, Log.VERBOSE)) {
  Log.v(TAG, "Get: Obtained: " + safeKey + " for for Key: " + key);
 }
 File result = null;
 try {
  // It is possible that the there will be a put in between these two gets. If so that shouldn't
  // be a problem because we will always put the same value at the same key so our input streams
  // will still represent the same data.
  final DiskLruCache.Value value = getDiskCache().get(safeKey);
  if (value != null) {
   result = value.getFile(0);
  }
 } catch (IOException e) {
  if (Log.isLoggable(TAG, Log.WARN)) {
   Log.w(TAG, "Unable to get from disk cache", e);
  }
 }
 return result;
}

/**
 * 获取是否有某张原图的缓存
 * 缓存模式必须是：DiskCacheStrategy.SOURCE 才能获取到缓存文件
 */
public static File getGlideCacheFile(Context context, String url) {
  try {
    OriginalKey originalKey = new OriginalKey(url, EmptySignature.obtain());
    SafeKeyGenerator safeKeyGenerator = new SafeKeyGenerator();
    String safeKey = safeKeyGenerator.getSafeKey(originalKey);
    File file = new File(context.getCacheDir(), DiskCache.Factory.DEFAULT_DISK_CACHE_DIR);
    DiskLruCache diskLruCache = DiskLruCache.open(file, 1, 1, DiskCache.Factory.DEFAULT_DISK_CACHE_SIZE);
    DiskLruCache.Value value = diskLruCache.get(safeKey);
    if (value != null) {
      return value.getFile(0);
    }
  } catch (Exception e) {
    e.printStackTrace();
  }
  return null;
}

@Test public void readingTheSameFileMultipleTimes() throws Exception {
 set("a", "a", "b");
 DiskLruCache.Value value = cache.get("a");
 assertThat(value.getFile(0)).isSameAs(value.getFile(0));
}