android - 制作位图时内存不足错误

Question

我正在制作可以合成相机预览和 png 的相机应用程序。

我想在 onPictureTaken 回调中保存图片

我的来源在下面

    public void onPictureTaken(byte[] data, Camera camera) {

            //preview from camera
            Bitmap bitmap = BitmapFactory.decodeByteArray(data, 0, data.length); 

            // overlay image 
            Bitmap overlayBmp = overlay.getDrawingCache(); 

            //blank beatmap 
            Bitmap blankBitmap = 
            Bitmap.createBitmap(bitmap.getWidth(),bitmap.getHeight(), 
            Bitmap.Config.ARGB_8888); 

            //make canvas
            Canvas canvas = new Canvas(blankBitmap); 

            //composite image
            canvas.drawBitmap(bitmap, null,new Rect(0, 0, bitmap.getWidth(), 
    bitmap.getHeight()), null); 
            canvas.drawBitmap(overlayBmp, null,new Rect(0, 0, bitmap.getWidth(), 
    bitmap.getHeight()), null); 

但是它显示outofmemoryerror，我该如何解决这个问题..？

05-20 15:13:49.114: E/AndroidRuntime(31647): FATAL EXCEPTION: main
05-20 15:13:49.114: E/AndroidRuntime(31647): java.lang.OutOfMemoryError
05-20 15:13:49.114: E/AndroidRuntime(31647):    at android.graphics.Bitmap.nativeCreate(Native Method)
05-20 15:13:49.114: E/AndroidRuntime(31647):    at android.graphics.Bitmap.createBitmap(Bitmap.java:605)
05-20 15:13:49.114: E/AndroidRuntime(31647):    at android.graphics.Bitmap.createBitmap(Bitmap.java:585)
05-20 15:13:49.114: E/AndroidRuntime(31647):    at com.example.firstcameraappli.MainActivity$2.onPictureTaken(MainActivity.java:103)
05-20 15:13:49.114: E/AndroidRuntime(31647):    at android.hardware.Camera$EventHandler.handleMessage(Camera.java:750)
05-20 15:13:49.114: E/AndroidRuntime(31647):    at android.os.Handler.dispatchMessage(Handler.java:99)
05-20 15:13:49.114: E/AndroidRuntime(31647):    at      android.os.Looper.loop(Looper.java:137)
05-20 15:13:49.114: E/AndroidRuntime(31647):    at android.app.ActivityThread.main(ActivityThread.java:4514)
05-20 15:13:49.114: E/AndroidRuntime(31647):    at java.lang.reflect.Method.invokeNative(Native Method)
05-20 15:13:49.114: E/AndroidRuntime(31647):    at java.lang.reflect.Method.invoke(Method.java:511)
05-20 15:13:49.114: E/AndroidRuntime(31647):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:980)

Answer 1

试试这段代码....

PictureCallback myPictureCallback_JPG = new PictureCallback()
{

    @Override
    public void onPictureTaken(byte[] data, Camera arg1) {

        BitmapFactory.Options opt;

        opt = new BitmapFactory.Options();
        opt.inTempStorage = new byte[16 * 1024];
        Parameters parameters = arg1.getParameters();
        Size size = parameters.getPictureSize();

        int height11 = size.height;
        int width11 = size.width;
        float mb = (width11 * height11) / 1024000;

        if (mb > 4f)
            opt.inSampleSize = 4;
        else if (mb > 3f)
            opt.inSampleSize = 2;

        //preview from camera
        Bitmap bitmap = BitmapFactory.decodeByteArray(data, 0, data.length,opt); 


    }
}

获取位图中的图像，然后根据您的要求使用。