在我的 Android 应用程序中,我需要在图像视图的触摸位置放置一个图标。我使用了以下代码,但我无法得到结果。我的代码是:
public class MainActivity extends Activity {
private ImageView iv;
private Bitmap bitmap2 = null, bitmap = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Drawable myDrawable = getResources().getDrawable(R.drawable.i);
bitmap2 = ((BitmapDrawable) myDrawable).getBitmap();
Drawable myDrawable1 = getResources().getDrawable(
R.drawable.ic_launcher);
bitmap = ((BitmapDrawable) myDrawable1).getBitmap();
final Bitmap bitmap1 = bitmap.copy(bitmap.getConfig(), true);
iv = (ImageView) findViewById(R.id.imageView1);
iv.setOnTouchListener(new OnTouchListener() {
@Override
public boolean onTouch(View arg0, MotionEvent event) {
Matrix inverse = new Matrix();
iv.getImageMatrix().invert(inverse);
float[] touchPoint = new float[] { event.getRawX(),
event.getRawY() };
inverse.mapPoints(touchPoint);
Log.e("touch", "touch coords = [x,y] " + touchPoint[0] + " , "
+ touchPoint[1]);
Bitmap resultBitmap = Bitmap.createBitmap(
bitmap1.getWidth(), bitmap1.getHeight(),
Bitmap.Config.ARGB_8888);
Canvas c = new Canvas(resultBitmap);
c.drawBitmap(bitmap1, touchPoint[0], touchPoint[1], null);
Paint p = new Paint();
p.setAlpha(127);
c.drawBitmap(bitmap2, touchPoint[0], touchPoint[1], p);
Log.e("canvas", "bitmap drawing");
return false;
}
});
}
}
预期输出:
无论用户在哪里点击图像视图,我都需要在其上放置“P”图标。