Question

我正在开发Android的应用程序，它应该从相机拍摄照片并将这些图像用作应用程序的个人资料图片。然而，该应用程序运行良好的前3-4张图片，但当我尝试拍摄更多图片时，应用程序崩溃了。原因是内存泄漏。

以下是启动相机意图的代码：

String fileName = "temp.jpg";
ContentValues values = new ContentValues();
values.put(MediaStore.Images.Media.TITLE, fileName);
mCapturedImageURI = getContentResolver().insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, values);
Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
takePictureIntent.setFlags(Intent.FLAG_ACTIVITY_REORDER_TO_FRONT);
takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, mCapturedImageURI);
startActivityForResult(takePictureIntent,RESULT_LOAD_IMAGE_CAMERA);

以下是接收意图的代码：

if (requestCode == RESULT_LOAD_IMAGE_CAMERA && resultCode == RESULT_OK ) {
    String[] projection = { MediaStore.Images.Media.DATA};
    Cursor cursor = managedQuery(mCapturedImageURI, projection, null, null, null);
    final int column_index_data = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
    cursor.moveToFirst();
    String capturedImageFilePath = cursor.getString(column_index_data);
    profilePic.setImageURI(Uri.fromFile(new  File(capturedImageFilePath)));
}

这是日志：

02-28 18:28:36.727: E/dalvikvm-heap(4081): 9830400-byte external allocation too large for this process.
02-28 18:28:36.727: E/GraphicsJNI(4081): VM won't let us allocate 9830400 bytes
02-28 18:28:36.824: E/AndroidRuntime(4081): FATAL EXCEPTION: main
02-28 18:28:36.824: E/AndroidRuntime(4081): java.lang.OutOfMemoryError: bitmap size    exceeds VM budget
02-28 18:28:36.824: E/AndroidRuntime(4081):     at   android.graphics.BitmapFactory.nativeDecodeStream(Native Method)
02-28 18:28:36.824: E/AndroidRuntime(4081):     at   android.graphics.BitmapFactory.decodeStream(BitmapFactory.java:562)
02-28 18:28:36.824: E/AndroidRuntime(4081):     at  android.graphics.BitmapFactory.decodeResourceStream(BitmapFactory.java:426)
02-28 18:28:36.824: E/AndroidRuntime(4081):     at android.graphics.drawable.Drawable.createFromResourceStream(Drawable.java:697)
02-28 18:28:36.824: E/AndroidRuntime(4081):     at android.graphics.drawable.Drawable.createFromStream(Drawable.java:657)
02-28 18:28:36.824: E/AndroidRuntime(4081):     at android.widget.ImageView.resolveUri(ImageView.java:509)
02-28 18:28:36.824: E/AndroidRuntime(4081):     at android.widget.ImageView.setImageURI(ImageView.java:293)
02-28 18:28:36.824: E/AndroidRuntime(4081):     at com.octanetech.cortes.ProfileActivity.onActivityResult(ProfileActivity.java:596)
02-28 18:28:36.824: E/AndroidRuntime(4081):     at android.app.Activity.dispatchActivityResult(Activity.java:3890)
02-28 18:28:36.824: E/AndroidRuntime(4081):     at android.app.ActivityThread.deliverResults(ActivityThread.java:3511)
02-28 18:28:36.824: E/AndroidRuntime(4081):     at android.app.ActivityThread.handleSendResult(ActivityThread.java:3557)
02-28 18:28:36.824: E/AndroidRuntime(4081):     at android.app.ActivityThread.access$2800(ActivityThread.java:125)
02-28 18:28:36.824: E/AndroidRuntime(4081):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2063)
02-28 18:28:36.824: E/AndroidRuntime(4081):     at android.os.Handler.dispatchMessage(Handler.java:99)
02-28 18:28:36.824: E/AndroidRuntime(4081):     at android.os.Looper.loop(Looper.java:123)
02-28 18:28:36.824: E/AndroidRuntime(4081):     at android.app.ActivityThread.main(ActivityThread.java:4627)
02-28 18:28:36.824: E/AndroidRuntime(4081):     at java.lang.reflect.Method.invokeNative(Native Method)
02-28 18:28:36.824: E/AndroidRuntime(4081):     at java.lang.reflect.Method.invoke(Method.java:521)
02-28 18:28:36.824: E/AndroidRuntime(4081):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:871)
02-28 18:28:36.824: E/AndroidRuntime(4081):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:629)
02-28 18:28:36.824: E/AndroidRuntime(4081):     at dalvik.system.NativeStart.main(Native Method)

任何帮助都将受到高度赞赏。

Answer 1

最后我自己解决了这个问题。导致内存泄漏的主要问题是我没有回收位图对象。我只是用另一个位图图像替换位图对象。认为对象被另一个Bitmap图像替换，仍然是先前的Bitmap图像存在于内存中。因此，在从相机拍摄多个图像时，位图图像堆积起来并引发了内存不足的异常。

因此，在将新图像分配给Bitmap对象之前，我玩了一个回收（删除）Bitmap图像的技巧。我刚用过

mImageBitmap.recycle();

这清除了之前的Bitmap图像，并且没有发生内存泄漏。希望它也能帮助其他人。

Answer 2

替换此行

profilePic.setImageURI(Uri.fromFile(new  File(capturedImageFilePath)));

您正在直接从sdcard加载图像，但它的大小可能会导致内存问题。

试试这个

BitmapFactory.Options options = new BitmapFactory.Options();
options.inSampleSize=8;      // 1/8 of original image
Bitmap b = BitmapFactory.decodeFile(capturedImageFilePath,options);
profilePic.setImageBitmap(b);

Answer 3

尝试使用inSampleSize扩展较大的位图，如下所示：摘自@ Fedor懒惰列表的片段 https://github.com/thest1/LazyList/blob/master/src/com/fedorvlasov/lazylist/ImageLoader.java

public int inSampleSize

如果设置为值＆gt; 1，请求解码器对原始图像进行二次采样，返回较小的图像以节省存储器。

//decodes image and scales it to reduce memory consumption
    private Bitmap decodeFile(File f){
        try {
            //decode image size
            BitmapFactory.Options o = new BitmapFactory.Options();
            o.inJustDecodeBounds = true;
            FileInputStream stream1=new FileInputStream(f);
            BitmapFactory.decodeStream(stream1,null,o);
            stream1.close();

            //Find the correct scale value. It should be the power of 2.
            final int REQUIRED_SIZE=70;
            int width_tmp=o.outWidth, height_tmp=o.outHeight;
            int scale=1;
            while(true){
                if(width_tmp/2<REQUIRED_SIZE || height_tmp/2<REQUIRED_SIZE)
                    break;
                width_tmp/=2;
                height_tmp/=2;
                scale*=2;
            }

            //decode with inSampleSize
            BitmapFactory.Options o2 = new BitmapFactory.Options();
            o2.inSampleSize=scale;
            FileInputStream stream2=new FileInputStream(f);
            Bitmap bitmap=BitmapFactory.decodeStream(stream2, null, o2);
            stream2.close();
            return bitmap;
        } catch (FileNotFoundException e) {
        } 
        catch (IOException e) {
            e.printStackTrace();
        }
        return null;
    }

希望这能帮到你：

从Android相机拍摄多张照片后应用程序崩溃

3 个答案: