Android 图片的平移、缩放、倒影、旋转实现

解析：
1）根据原来的图片创建新的图片
Bitmap modBm = Bitmap.createBitmap(bm.getWidth()+20, bm.getHeight()+20, bm.getConfig());
2）设置到画布
Canvas canvas = new Canvas(modBm);
3）使用矩阵进行平移…
Matrix matrix = new Matrix();
matrix.setRotate(90, bm.getWidth()/2, bm.getHeight()/2);
4）把改变后图片设置到
canvas.drawBitmap(bm, matrix, paint);
imageView2.setImageBitmap(modBm);

示例代码：
1、平移：

public class TranslateImageActivity extends Activity {

    private ImageView imageView1;
    private ImageView imageView2;

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

    private void initViews() {
        imageView1 = (ImageView) findViewById(R.id.imageView1);
        imageView2 = (ImageView) findViewById(R.id.imageView2);

        Bitmap bm = BitmapFactory.decodeResource(getResources(), R.drawable.mm0);
        imageView1.setImageBitmap(bm);

        Bitmap modBm = Bitmap.createBitmap(bm.getWidth()+20, bm.getHeight()+20, bm.getConfig());
        Canvas canvas = new Canvas(modBm);
        Paint paint = new Paint();
        paint.setColor(Color.BLACK);
        paint.setAntiAlias(true);
        Matrix matrix = new Matrix();
        //matrix.setRotate(90, bm.getWidth()/2, bm.getHeight()/2);
        matrix.setTranslate(20, 20);
        matrix.postTranslate(20, 20);

        canvas.drawBitmap(bm, matrix, paint);
        imageView2.setImageBitmap(modBm);
    }
}

2、缩放

public class ScaleImageActivity extends BaseActivity {
    private static final int DOUBLE = 2;
    private ImageView iv1, iv2;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_scale_iamge);
        iv1 = (ImageView) findViewById(R.id.imageView1);
        iv2 = (ImageView) findViewById(R.id.imageView2);

        Bitmap b1 = BitmapFactory.decodeResource(getResources(), R.drawable.p1);
        iv1.setImageBitmap(b1);
        Bitmap b2 = Bitmap.createBitmap(b1.getWidth()*DOUBLE, b1.getHeight(), Config.ARGB_8888);

        Canvas canvas = new Canvas(b2);
        Matrix matrix = new Matrix();
        matrix.setValues(new float[]{
                DOUBLE * 1.0f, 0,       0,//x
                0,             1.0f,    0,//y
                0,             0,       1.0f//z
        });
        canvas.drawBitmap(b1, matrix, new Paint());
        iv2.setImageBitmap(b2);
    }
}

3、倒影

public class ShadeImageActivity extends Activity {

    private ImageView imageView1;
    private ImageView imageView2;

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

    private void initViews() {
        imageView1 = (ImageView) findViewById(R.id.imageView1);
        imageView2 = (ImageView) findViewById(R.id.imageView2);

        Bitmap bm = BitmapFactory.decodeResource(getResources(), R.drawable.mm3);
        imageView1.setImageBitmap(bm);

        Bitmap modBm = Bitmap.createBitmap(bm.getWidth(), bm.getHeight(), bm.getConfig());
        Canvas canvas = new Canvas(modBm);
        Paint paint = new Paint();
        paint.setColor(Color.BLACK);
        paint.setAntiAlias(true);
        Matrix matrix = new Matrix();
        //matrix.setRotate(90, bm.getWidth()/2, bm.getHeight()/2);
        //matrix.setTranslate(20, 20);
        //镜子效果
        matrix.setScale(1, -1);
        matrix.postTranslate(0, bm.getHeight());

        canvas.drawBitmap(bm, matrix, paint);
        imageView2.setImageBitmap(modBm);
    }
}

4、旋转

public class RotateImageActivity extends Activity {

    private ImageView imageView1;
    private ImageView imageView2;

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

    private void initViews() {
        imageView1 = (ImageView) findViewById(R.id.imageView1);
        imageView2 = (ImageView) findViewById(R.id.imageView2);

        Bitmap bm = BitmapFactory.decodeResource(getResources(), R.drawable.mm0);
        imageView1.setImageBitmap(bm);

        Bitmap modBm = Bitmap.createBitmap(bm.getWidth(), bm.getHeight(), bm.getConfig());
        Canvas canvas = new Canvas(modBm);
        Paint paint = new Paint();
        paint.setColor(Color.BLACK);
        paint.setAntiAlias(true);
        Matrix matrix = new Matrix();
        matrix.setRotate(90, bm.getWidth()/2, bm.getHeight()/2);
        canvas.drawBitmap(bm, matrix, paint);
        imageView2.setImageBitmap(modBm);
    }
}

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