内存不足异常未被捕获

Question

我可以选择Bitmap在我的应用程序中保存到SD卡.
我正在节省AsyncTask方法.这是我在背景上所做的

public File saveImageToExternalStorage(Bitmap image, String name) {
 String fullPath = Environment.getExternalStorageDirectory().getAbsolutePath() + APP_PATH_SD_CARD + APP_THUMBNAIL_PATH_SD_CARD;

 try {
 File dir = new File(fullPath);
 if (!dir.exists()) {
 dir.mkdirs();
 }
 OutputStream fOut = null;
 File file = new File(fullPath, name.replaceAll("/", "").trim());
 file.createNewFile();
 fOut = new FileOutputStream(file);
 image.compress(Bitmap.CompressFormat.JPEG, 50, fOut);
 fOut.flush();
 fOut.close();
 MediaStore.Images.Media.insertImage(getApplicationContext().getContentResolver(), file.getAbsolutePath(), file.getName(), file.getName());

 return file;

 } catch (Exception e) {
 return null;
 }

如果我从这个方法中获取null,我正在显示有关用户无法保存等信息.虽然这应该足够了,但是我报告OutOfMemory了一个用户从这个方法崩溃了.堆栈跟踪:

java.lang.RuntimeException: An error occured while executing doInBackground()
at android.os.AsyncTask$3.done(AsyncTask.java:299)
at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273)
at java.util.concurrent.FutureTask.setException(FutureTask.java:124)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307)
at java.util.concurrent.FutureTask.run(FutureTask.java:137)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
at java.lang.Thread.run(Thread.java:856)
Caused by: java.lang.OutOfMemoryError
at android.graphics.BitmapFactory.nativeDecodeStream(Native Method)
at android.graphics.BitmapFactory.decodeStream(BitmapFactory.java:527)
at android.graphics.BitmapFactory.decodeFile(BitmapFactory.java:301)
at android.graphics.BitmapFactory.decodeFile(BitmapFactory.java:326)
at android.provider.MediaStore$Images$Media.insertImage(MediaStore.java:796)
at com.stancedcars.wallpapers.FullSelected.saveImageToExternalStorage(FullSelected.java:223)

我很乐意解决OutOfMemory问题,但是它Bitmap的尺寸很大,图像分辨率很高,我不想降低质量.更重要的是,我想知道为什么应用程序崩溃,即使它是在try catch？

Answer 1

你捕获了通用的Exception,而OutOfMemoryError是一个Error,它也是Throwable.

你有什么

java.lang.Object
   ?    java.lang.Throwable
       ?    java.lang.Error
           ?    java.lang.VirtualMachineError
               ?    java.lang.OutOfMemoryError

你能抓到什么

java.lang.Object
   ?    java.lang.Throwable
       ?    java.lang.Exception

所以要抓住所有可能的Throwables,你需要抓住

try {
     //...
} catch (Throwable e) {
    e.printStackTrace();
}