[android-developers] how to convert imagetview(ex maytinh.png) to bitmap

help me:
check my code:

package com.khmt2k3.xuantung.imageview;
import android.app.Activity;
import android.os.Bundle;
import android.widget.ImageView;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;

public class ImageViewActivity extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
ImageView image = new ImageView(context);
Bitmap viewBitmap =
Bitmap.createBitmap(maytinh.getWidth(),maytinh.getHeight(),Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(viewBitmap);
image.draw(canvas);
}
}

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