当我对图像产生影响时，android应用程序中的内存泄漏

Question

我是相机内功能的新手。当我启动相机并单击图像后在图像视图上设置图像然后我单击效果按钮。现在应用程序已关闭。错误是内存。这个应用程序是在 2.2 以下版本上制作的。当我曾经在 4.4 版本中运行这个应用程序时，应用程序被弯腰显示应用程序中的内存泄漏

12-05 17:10:53.898: E/dalvikvm-heap(21667): Out of memory on a 31961104-byte allocation.
12-05 17:10:53.938: E/dalvikvm(21667): Out of memory: Heap Size=42403KB, Allocated=34174KB, Limit=49152KB
12-05 17:10:53.938: E/dalvikvm(21667): Extra info: Footprint=42403KB, Allowed Footprint=42403KB, Trimmed=0KB
12-05 17:10:53.948: E/AndroidRuntime(21667): FATAL EXCEPTION: main
12-05 17:10:53.948: E/AndroidRuntime(21667): java.lang.OutOfMemoryError: (Heap Size=42403KB, Allocated=34174KB)
12-05 17:10:53.948: E/AndroidRuntime(21667):    at android.graphics.Bitmap.nativeCreate(Native Method)
12-05 17:10:53.948: E/AndroidRuntime(21667):    at android.graphics.Bitmap.createBitmap(Bitmap.java:917)
12-05 17:10:53.948: E/AndroidRuntime(21667):    at android.graphics.Bitmap.createBitmap(Bitmap.java:897)
12-05 17:10:53.948: E/AndroidRuntime(21667):    at com.photomarging.PhotoMargingActivity.createSepiaToningEffect(PhotoMargingActivity.java:577)
12-05 17:10:53.948: E/AndroidRuntime(21667):    at com.photomarging.PhotoMargingActivity.applyEffect(PhotoMargingActivity.java:472)
12-05 17:10:53.948: E/AndroidRuntime(21667):    at com.photomarging.PhotoMargingActivity$5.onClick(PhotoMargingActivity.java:199)
12-05 17:10:53.948: E/AndroidRuntime(21667):    at android.view.View.performClick(View.java:3549)
12-05 17:10:53.948: E/AndroidRuntime(21667):    at android.view.View$PerformClick.run(View.java:14393)
12-05 17:10:53.948: E/AndroidRuntime(21667):    at android.os.Handler.handleCallback(Handler.java:605)
12-05 17:10:53.948: E/AndroidRuntime(21667):    at android.os.Handler.dispatchMessage(Handler.java:92)
12-05 17:10:53.948: E/AndroidRuntime(21667):    at android.os.Looper.loop(Looper.java:154)
12-05 17:10:53.948: E/AndroidRuntime(21667):    at android.app.ActivityThread.main(ActivityThread.java:4945)
12-05 17:10:53.948: E/AndroidRuntime(21667):    at java.lang.reflect.Method.invokeNative(Native Method)
12-05 17:10:53.948: E/AndroidRuntime(21667):    at java.lang.reflect.Method.invoke(Method.java:511)
12-05 17:10:53.948: E/AndroidRuntime(21667):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
12-05 17:10:53.948: E/AndroidRuntime(21667):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
12-05 17:10:53.948: E/AndroidRuntime(21667):    at dalvik.system.NativeStart.main(Native Method)

主要课程在这里http://pastebin.com/sR5FPG22，另一个课程在这里http://pastebin.com/GY3xzPBW（照片合并），我不明白如何解决问题帮助我 预览课在这里

    @TargetApi(8)
  class Preview extends SurfaceView implements SurfaceHolder.Callback {
private static final String TAG = "Preview";

SurfaceHolder mHolder;
public Camera camera;

Preview(Context context) {
    super(context);

    // Install a SurfaceHolder.Callback so we get notified when the
    // underlying surface is created and destroyed.
    mHolder = getHolder();
    mHolder.addCallback(this);
    mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);

}

public void surfaceCreated(SurfaceHolder holder) {
    // The Surface has been created, acquire the camera and tell it where
    // to draw.
    if(camera==null){
    camera = Camera.open();
    }
    else{
        try {
            camera.reconnect();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
    try {
        camera.setPreviewDisplay(holder);


        camera.setPreviewCallback(new PreviewCallback() {

            public void onPreviewFrame(byte[] data, Camera arg1) {
                FileOutputStream outStream = null;
                try {

                    ByteArrayInputStream imagestream=new     
  ByteArrayInputStream(data);
                    Bitmap     
      icon=BitmapFactory.decodeStream(imagestream);

    PhotoMargingActivity.img.setImageBitmap(icon);
                    outStream = new 
       FileOutputStream(String.format("/sdcard/%d.jpg",    
  System.currentTimeMillis())); 
                    outStream.write(data);
                    outStream.close();
                    Log.d(TAG, "onPreviewFrame - wrote bytes: 
         " + data.length);
                } catch (FileNotFoundException e) {
                    e.printStackTrace();
                } catch (IOException e) {
                    e.printStackTrace();
                } finally {
                }
                    Preview.this.invalidate();
                    //
            }
        });
    } catch (IOException e) {
        e.printStackTrace();
    }
}

public void surfaceDestroyed(SurfaceHolder holder) {
    // Surface will be destroyed when we return, so stop the preview.
    // Because the CameraDevice object is not a shared resource, it's very
    // important to release it when the activity is paused.
    camera.stopPreview();

    camera.release();
    camera = null;
}
     ///////////////////// change in the preve class /////////////////////////////
    public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) {
    // Now that the size is known, set up the camera parameters and begin
    // the preview.
     //        Camera.Parameters parameters = camera.getParameters();
      //        parameters.setPreviewSize(w, h);
      //        camera.setParameters(parameters);
      //        camera.startPreview();

    // Now that the size is known, set up the camera parameters and begin
    // the preview.
    //        Camera.Parameters parameters = camera.getParameters();
     //        parameters.setPreviewSize(w, h);
     //        camera.setParameters(parameters);
      //        camera.startPreview();

     Camera.Parameters parameters = camera.getParameters();
        List<Camera.Size> previewSizes = parameters.getSupportedPreviewSizes();

        // You need to choose the most appropriate previewSize for your app
        Camera.Size previewSize;//= // .... select one of previewSizes here
                 if(previewSizes.size() > 1){
                        previewSize =previewSizes.get(1);  // .... select one of    
           previewSizes here
                    }else{
                        previewSize =previewSizes.get(0);
                    }
        parameters.setPreviewSize(previewSize.width, previewSize.height);
        camera.setParameters(parameters);
        camera.startPreview();

}

@Override
public void draw(Canvas canvas) {
        super.draw(canvas);
        Paint p= new Paint(Color.RED);
        Log.d(TAG,"draw");
        canvas.drawText("PREVIEW", canvas.getWidth()/2, canvas.getHeight()/2, p );
}

Answer 1

在您处理使用中的主要变量的特定位置在您的代码中使用以下代码。

Runtime.getRuntime().gc();

另外，请继续练习，通过以下方式回收不需要的位图对象。

if (bitmap != null){
  bitmap.recycle();
  bitmap = null;
}

希望这对您有所帮助。

谢谢。