<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:tools="http://schemas.android.com/tools"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:orientation="vertical"
  tools:context=".MainActivity" >

  <ImageView
    android:id="@+id/iv_1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    />

  <ImageView
    android:id="@+id/iv_2"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
     />

</LinearLayout>

邏輯代碼如下：

public class MainActivity extends Activity {

  private ImageView iv1;
  private ImageView iv2;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    iv1 = (ImageView) findViewById(R.id.iv_1);
    iv2 = (ImageView) findViewById(R.id.iv_2);

    // 設(shè)置第一個(gè)bitmap的圖標(biāo)
    Bitmap bitmap1 = BitmapFactory.decodeResource(getResources(),
        R.drawable.ic_launcher);

    iv1.setImageBitmap(bitmap1);

    // 新建一個(gè)bitmap
    Bitmap alterBitmap = Bitmap.createBitmap(bitmap1.getWidth(),
        bitmap1.getHeight(), bitmap1.getConfig());

    // 以alterBitmap為模板新建畫(huà)布
    Canvas canvas = new Canvas(alterBitmap);
    // 新建畫(huà)筆并設(shè)置屬性
    Paint paint = new Paint();
    paint.setColor(Color.BLACK);
    
    //新建矩陣并設(shè)置縮放值
    Matrix matrix = new Matrix();
    matrix.setValues(new float[] { 
        0.5f, 0, 0, 
        0, 1, 0, 
        0, 0, 1 
    });
    //設(shè)置畫(huà)布
    canvas.drawBitmap(bitmap1, matrix, paint);
    iv2.setImageBitmap(alterBitmap);
  }

}

如果你對(duì)矩陣的設(shè)置不清楚，還可以使用下列api提供的方法替換上面標(biāo)記部分的代碼：

matrix.setScale(0.5f, 1);

注意：新建矩陣并設(shè)置縮放值

       Matrix matrix = new Matrix();
        matrix.setValues(new float[] {
                0.5f, 0, 0,
                0, 1, 0,
                0, 0, 1
        });

最后運(yùn)行項(xiàng)目效果如下：