android - 我的简单 android Activity 如何泄漏内存？

Question

我的 Activity 只显示一张图片:

public class PhotoFrameActivity extends Activity {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        File externalStorageDir = Environment.getExternalStorageDirectory();
        File picturesDir = new File(externalStorageDir, "DCIM/Camera");
        File[] files = picturesDir.listFiles(new FilenameFilter(){
            public boolean accept(File dir, String name) {
                return name.toLowerCase().endsWith(".jpg");
            }});
        List<File> photoFiles = Arrays.asList(files);
        if (!photoFiles.isEmpty()) {
            try {
                Bitmap currentPhoto = BitmapFactory.decodeStream(new FileInputStream(photoFiles.get(3)));
                ImageView view = (ImageView) findViewById(R.id.photo);
                view.setImageBitmap(currentPhoto);
            } catch (FileNotFoundException e) {
                Log.e("SHOWPIC", "Could not find photo", e);
            }
        }
    }

}

如果 Activity 重新启动，则不会回收内存。即，如果我转动手机两次，我会得到以下 FC:

10-01 17:29:06.011: ERROR/AndroidRuntime(8446): java.lang.OutOfMemoryError: bitmap size exceeds VM budget
10-01 17:29:06.011: ERROR/AndroidRuntime(8446):     at android.graphics.BitmapFactory.nativeDecodeStream(Native Method)
10-01 17:29:06.011: ERROR/AndroidRuntime(8446):     at android.graphics.BitmapFactory.decodeStream(BitmapFactory.java:470)
10-01 17:29:06.011: ERROR/AndroidRuntime(8446):     at android.graphics.BitmapFactory.decodeStream(BitmapFactory.java:525)
10-01 17:29:06.011: ERROR/AndroidRuntime(8446):     at net.badgerhunt.photoframe.PhotoFrameActivity.onCreate(PhotoFrameActivity.java:34)

我怎么漏水了？

Answer 1

正如 Yashwanth Kumar 所建议的，这不是因为您的图像太大。即使您减少样本量，您仍然(最终)会得到 OOM。您的内存泄漏不会通过减少样本量来解决。

您似乎有内存泄漏。您可以继续寻找内存泄漏并尝试找到问题的根源，或者您可以覆盖 Activity 的 ondestroy 方法并执行

 @Override
    protected void onDestroy() {
        super.onDestroy();
    view.setImageBitmap(null);
    currentPhoto.recycle();
    }

这将确保您的位图得到回收并在您的 Activity 被销毁时释放内存(如在方向切换的情况下)。但是，我建议您观看此视频并最终找到泄漏的根源:http://www.google.com/events/io/2011/sessions/memory-management-for-android-apps.html