public class helloWorld extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView( new drawCanvas(this) );
}
class drawCanvas extends View {
public drawCanvas(Context context) {
super(context);
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
// 取得Resource 圖片的Bitmap
Bitmap vBitmap = BitmapFactory.decodeResource( this.getResources(), R.drawable.icon);
// 建立Paint 物件
Paint vPaint = new Paint();
vPaint .setStyle( Paint.Style.STROKE ); //空心
vPaint .setAlpha( 75 ); // Bitmap透明度(0 ~ 100)
canvas.drawBitmap ( vBitmap , 50, 100, null ); //無透明
canvas.drawBitmap ( vBitmap , 50, 200, vPaint ); //有透明
}
}
}