android EMFILE(太多打开的文件)

Question

我实现了一个文件缓存来加载长图像的小图像.滚动片刻后,我得到了很多libcore.io.ErrnoException: open failed: EMFILE (Too many open files)

我该如何避免这种情况？这是读取一个位图的代码:

File fullCacheDir = new File(Environment.getExternalStorageDirectory().toString(), cacheDir);
File file = new File(fullCacheDir.toString(), fileName);

if (!file.exists()) {
    return null;
}

Bitmap bm = BitmapFactory.decodeFile(file.toString());

这是为了保存一个位图:

FileOutputStream outputStream = new FileOutputStream(fileUri);
bitmap.compress(Bitmap.CompressFormat.JPEG, 100, outputStream);
outputStream.flush();
outputStream.close();

Answer 1

由于异常,你的close()调用是否有机会？我一般编码如下:

try {
  new FileOutputStream(fileUri);
  bitmap.compress(Bitmap.CompressFormat.JPEG, 100, outputStream);
  outputStream.flush();
} finally {
  try {
    outputStream.close();
  } catch (Exception ignored) {
    // ignore exceptions generated by close()
  }
}

我看不出第一个代码片段有什么明显错误.