Android Bitmap 縮放 (Picture 縮放)

Android 透過 Bitmap.createScaledBitmap 來設定 Bitmap 縮放.

Java 程式範例 :

 程式碼

public class helloWorld extends Activity {
    
    /** Called when the activity is first created. */
    @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
                                                         );
            
            // Bitmap 縮放
            Bitmap vB2 = Bitmap.createScaledBitmap( vBitmap
                                                  , vBitmap.getWidth() * 3
                                                  , vBitmap.getHeight() * 2
                                                  , true
                                                  );
            
            canvas.drawBitmap( vBitmap, 50, 100, null );  // 無縮放
            canvas.drawBitmap( vB2,     50, 200, null );  // 有縮放
        }
    }
}

範例結果 :

昭佑.天翔