ImageView becomes blank on Screen orientation chan

问题:

I am using the below line to set my ImageView.

    Bitmap bm = Media.getBitmap(getContentResolver(), capturedImage);
                    Bitmap bm1=Bitmap.createScaledBitmap(bm, 300, 300,true);
                    pic.setImageBitmap(bm1);

But when I rotate my mobile, the imageView becomes blank. Can anyone help me. Any help is appreciated.

回答1:

Proper way to it is to save the bitmap in onRetainNonConfigurationInstance()

Here is an example: http://developer.android.com/guide/topics/resources/runtime-changes.html

回答2:

Try adding android:configChanges="orientation|keyboardHidden" to your Activity tag in your AndroidManifest. Take a look here for more details.

回答3:

You should save capturedImage in your onSaveInstanceState method, and then check in your onRestoreInstanceState method to see if you saved it and then re-execute the code you have above. See the answer of Saving Android Activity state using Save Instance State for an excellent example of how this would work.