android - 显示图像导致内存错误(31961104 字节分配内存不足。)

Question

我有一个应用程序可以拍照，然后在应用程序中显示它们。拍摄的第一张图片有效并显示在应用程序中，但是当拍摄第二张图片时，应用程序崩溃并且我在 logcat 的标题中收到错误。

p.s 这是 friend 写的代码，所以我不是100%确定。

代码

private PictureCallback mPicture = new PictureCallback() {
    @Override
    public void onPictureTaken(byte[] data, Camera camera) {
        mImageView = (ImageView) findViewById(R.id.mImageView);
        Bitmap imageBitmap = BitmapFactory.decodeByteArray(data, 0,
                data.length);

        mImageView.setImageBitmap(imageBitmap);

        File pictureFile = getOutputMediaFile(MEDIA_TYPE_IMAGE);
        if (pictureFile == null) {
            /*
             * Log.d(TAG,
             * "Error creating media file, check storage permissions: " +
             * e.getMessage());
             */
            return;
        }
        try {
            SharedPreferences save = getPreferences(0);
            SharedPreferences.Editor editor = save.edit(); 
            editor.putString("oldFile", pictureFile.getAbsolutePath());

            // Commit the edits!
            editor.commit();
            Log.v("output", "oldFile: " + oldFilePath);
            File oldFile = new File(oldFilePath);
            if(oldFile.delete()) // DELETING PICTURES TOO FAST.
                Log.v(TAG, "Image deleted.");
            oldFilePath = pictureFile.getAbsolutePath();
            Log.v("output", "newFile: " + oldFilePath);

            FileOutputStream fos = new FileOutputStream(pictureFile);
            fos.write(data);
            fos.close();
        } catch (FileNotFoundException e) {
            Log.d(TAG, "File not found: " + e.getMessage());
        } catch (IOException e) {
            Log.d(TAG, "Error accessing file: " + e.getMessage());
        }
    }
};

日志

02-19 14:22:08.158: E/dalvikvm-heap(10394): Out of memory on a 31961104-byte allocation. 02-19 14:22:08.163: E/AndroidRuntime(10394): FATAL EXCEPTION: main 02-19 14:22:08.163: E/AndroidRuntime(10394): java.lang.OutOfMemoryError 02-19 14:22:08.163: E/AndroidRuntime(10394): at android.graphics.BitmapFactory.nativeDecodeByteArray(Native Method) 02-19 14:22:08.163: E/AndroidRuntime(10394): at android.graphics.BitmapFactory.decodeByteArray(BitmapFactory.java:551) 02-19 14:22:08.163: E/AndroidRuntime(10394): at android.graphics.BitmapFactory.decodeByteArray(BitmapFactory.java:569) 02-19 14:22:08.163: E/AndroidRuntime(10394): at com.example.oxplastics.MainActivity$1.onPictureTaken(MainActivity.java:331) 02-19 14:22:08.163: E/AndroidRuntime(10394): at android.hardware.Camera$EventHandler.handleMessage(Camera.java:823) 02-19 14:22:08.163: E/AndroidRuntime(10394): at android.os.Handler.dispatchMessage(Handler.java:99) 02-19 14:22:08.163: E/AndroidRuntime(10394): at android.os.Looper.loop(Looper.java:137) 02-19 14:22:08.163: E/AndroidRuntime(10394): at android.app.ActivityThread.main(ActivityThread.java:4921) 02-19 14:22:08.163: E/AndroidRuntime(10394): at java.lang.reflect.Method.invokeNative(Native Method) 02-19 14:22:08.163: E/AndroidRuntime(10394): at java.lang.reflect.Method.invoke(Method.java:511) 02-19 14:22:08.163: E/AndroidRuntime(10394): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1027) 02-19 14:22:08.163: E/AndroidRuntime(10394): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:794) 02-19 14:22:08.163: E/AndroidRuntime(10394): at dalvik.system.NativeStart.main(Native Method)

Answer 1

在屏幕上显示图像之前，您应该对图像进行采样，查看以下链接

http://developer.android.com/training/displaying-bitmaps/index.html .

现在有可能第一次创建您的位图对象时，您的设备有足够的内存，但是当创建下一个对象时它会内存不足!!