我想从ImageView中获取Bitmap。我使用了以下代码，但它抛出了ArrayIndexOutOfBoundExcpetion异常。如何解决这个问题？

 bitmap.getPixels(mImagePixels, 0, bitmap.getWidth(), 0, 0,                    bitmap.getWidth(), bitmap.getHeight());            int pixel = 0;            for (int i = 0; i < DIM_IMG_SIZE_WIDTH; ++i) {                for (int j = 0; j < DIM_IMG_SIZE_HEIGHT; ++j) {                    final int val = mImagePixels[pixel++];                    mImgData.putFloat(convertToGreyScale(val));                }            }        }        private float convertToGreyScale(int color) {            return (((color >> 16) & 0xFF) + ((color >> 8) & 0xFF) + (color & 0xFF)) / 3.0f / 255.0f;        }     java.lang.ArrayIndexOutOfBoundsException            at android.graphics.Bitmap.checkPixelsAccess(Bitmap.java:1824)            at android.graphics.Bitmap.getPixels(Bitmap.java:1765)            at com.drprajapati.android.plantclassification.ml.Classifier.convertBitmapToByteBuffer(Classifier.java:69)            at com.drprajapati.android.plantclassification.ml.Classifier.classify(Classifier.java:53)            at com.drprajapati.android.plantclassification.MainActivity$1.onClick(MainActivity.java:58)            at android.view.View.performClick(View.java:6671)            at android.view.View.performClickInternal(View.java:6640)            at android.view.View.access$3100(View.java:791)            at android.view.View$PerformClick.run(View.java:26173)            at android.os.Handler.handleCallback(Handler.java:873)            at android.os.Handler.dispatchMessage(Handler.java:99)            at android.os.Looper.loop(Looper.java:193)            at android.app.ActivityThread.main(ActivityThread.java:6912)            at java.lang.reflect.Method.invoke(Native Method)            at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:537)            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)

回答：

可以尝试以下方法：

BitmapDrawable drawable = (BitmapDrawable) imageView.getDrawable();Bitmap bitmap = drawable.getBitmap();