Android图片旋转,缩放,位移,倾斜,对称完整示例(一)——imageView.setImageMatrix(matrix)和Matrix

MainActivity如下:

import android.os.Bundle;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.widget.ImageView;
import android.app.Activity;
import android.graphics.Matrix;
/**
 * Demo描述:
 * 利用mImageView.setImageMatrix(matrix)实现
 * 图片的平移,缩放,旋转,倾斜以及对称
 *
 * 参考资料:
 * 0 http://blog.csdn.net/pathuang68/article/details/6991988
 * 1 http://blog.csdn.net/mingli198611/article/details/7830633
 *
 * Thank you very much
 */
public class MainActivity extends Activity {
    private TestMatrixImageView mTestMatrixImageView;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        mTestMatrixImageView=new TestMatrixImageView(MainActivity.this);
        mTestMatrixImageView.setScaleType(ImageView.ScaleType.MATRIX);//??
        mTestMatrixImageView.setOnTouchListener(new TouchListenerImpl());
        setContentView(mTestMatrixImageView);
    }

    private class TouchListenerImpl implements OnTouchListener{
        @Override
        public boolean onTouch(View v, MotionEvent event) {
            if (event.getAction()==MotionEvent.ACTION_UP) {
                //1 测试平移
                testTranslate();
                //2 测试围绕图片中心点旋转
                //testRotate();
                //3 测试围绕原点旋转后平移
                //testRotateAndTranslate();
                //4 缩放
                //testScale();
                //5 水平倾斜
                //testSkewX();
                //6 垂直倾斜
                //testSkewY();
                //7 水平且垂直倾斜
                //testSkewXY();
                //8 水平对称
                //testSymmetryX();
                //9 垂直对称
                //testSymmetryY();
                //10 关于X=Y对称
                //testSymmetryXY();
            }
            return true;
        }

    }

    //平移
    private void testTranslate(){
        Matrix matrix=new Matrix();
        int width=mTestMatrixImageView.getBitmap().getWidth();
        int height=mTestMatrixImageView.getBitmap().getHeight();
        matrix.postTranslate(width, height);
        mTestMatrixImageView.setImageMatrix(matrix);
        showMatrixEveryValue(matrix);
    }
    //围绕图片中心点旋转
    private void testRotate(){
        Matrix matrix=new Matrix();
        int width=mTestMatrixImageView.getBitmap().getWidth();
        int height=mTestMatrixImageView.getBitmap().getHeight();
        matrix.postRotate(45f, width/2, height/2);
        matrix.postTranslate(width, height);
        mTestMatrixImageView.setImageMatrix(matrix);
        showMatrixEveryValue(matrix);
    }

    //围绕原点旋转后平移
    //注意以下三行代码的执行顺序:
    //matrix.setRotate(45f);
    //matrix.preTranslate(-width, -height);
    //matrix.postTranslate(width, height);
    //先执行matrix.preTranslate(-width, -height);
    //后执行matrix.setRotate(45f);
    //再执行matrix.postTranslate(width, height);
    private void testRotateAndTranslate() {
        Matrix matrix = new Matrix();
        int width = mTestMatrixImageView.getBitmap().getWidth();
        int height = mTestMatrixImageView.getBitmap().getHeight();
        matrix.setRotate(45f);
        matrix.preTranslate(-width, -height);
        matrix.postTranslate(width, height);
        mTestMatrixImageView.setImageMatrix(matrix);
        showMatrixEveryValue(matrix);
    }

    //缩放
    private void testScale() {
        Matrix matrix = new Matrix();
        matrix.setScale(0.5f, 0.5f);
        mTestMatrixImageView.setImageMatrix(matrix);
        showMatrixEveryValue(matrix);
    }

    //水平倾斜
    private void testSkewX() {
        Matrix matrix = new Matrix();
        matrix.setSkew(0.5f, 0);
        mTestMatrixImageView.setImageMatrix(matrix);
        showMatrixEveryValue(matrix);
    }

    // 垂直倾斜
    private void testSkewY() {
        Matrix matrix = new Matrix();
        matrix.setSkew(0, 0.5f);
        mTestMatrixImageView.setImageMatrix(matrix);
        showMatrixEveryValue(matrix);
    }

    // 水平且垂直倾斜
    private void testSkewXY() {
        Matrix matrix = new Matrix();
        matrix.setSkew(0.5f, 0.5f);
        mTestMatrixImageView.setImageMatrix(matrix);
        showMatrixEveryValue(matrix);
    }

    // 水平对称--图片关于X轴对称
    private void testSymmetryX() {
        Matrix matrix = new Matrix();
        int height = mTestMatrixImageView.getBitmap().getHeight();
        float matrixValues[] = { 1f, 0f, 0f, 0f, -1f, 0f, 0f, 0f, 1f };
        matrix.setValues(matrixValues);
        //若是matrix.postTranslate(0, height);
        //表示将图片上下倒置
        matrix.postTranslate(0, height*2);
        mTestMatrixImageView.setImageMatrix(matrix);
        showMatrixEveryValue(matrix);
    }

    // 垂直对称--图片关于Y轴对称
    private void testSymmetryY() {
        Matrix matrix = new Matrix();
        int width=mTestMatrixImageView.getBitmap().getWidth();
        float matrixValues[] = {-1f, 0f, 0f, 0f, 1f, 0f, 0f, 0f, 1f};
        matrix.setValues(matrixValues);
        //若是matrix.postTranslate(width,0);
        //表示将图片左右倒置
        matrix.postTranslate(width*2, 0);
        mTestMatrixImageView.setImageMatrix(matrix);
        showMatrixEveryValue(matrix);

    }

    // 关于X=Y对称--图片关于X=Y轴对称
    private void testSymmetryXY() {
        Matrix matrix = new Matrix();
        int width = mTestMatrixImageView.getBitmap().getWidth();
        int height = mTestMatrixImageView.getBitmap().getHeight();
        float matrixValues[] = { 0f, -1f, 0f, -1f, 0f, 0f, 0f, 0f, 1f };
        matrix.setValues(matrixValues);
        matrix.postTranslate(width+height, width+height);
        mTestMatrixImageView.setImageMatrix(matrix);
        showMatrixEveryValue(matrix);
    }

    //获取变换矩阵Matrix中的每个值
    private void showMatrixEveryValue(Matrix matrix){
        float matrixValues []=new float[9];
        matrix.getValues(matrixValues);
        for (int i = 0; i <3; i++) {
            String valueString="";
            for (int j = 0; j < 3; j++) {
                valueString=matrixValues[3*i+j]+"";
                System.out.println("第"+(i+1)+"行的第"+(j+1)+"列的值为"+valueString);
            }
        }
    }

}

TestMatrixImageView如下:

package cn.testmatrix;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Matrix;
import android.widget.ImageView;
/**
 * 总结:
 * 在MainActivity中执行:
 * mTestMatrixImageView.setImageMatrix(matrix);
 * 时此自定义View会先调用setImageMatrix(Matrix matrix)
 * 然后调用onDraw(Canvas canvas)
 */
public class TestMatrixImageView extends ImageView{
    private Matrix mMatrix;
    private Bitmap mBitmap;
    public TestMatrixImageView(Context context) {
        super(context);
        mMatrix=new Matrix();
        mBitmap=BitmapFactory.decodeResource(getResources(), R.drawable.icon);
    }
    @Override
    protected void onDraw(Canvas canvas) {
        System.out.println("---> onDraw");
        //画原图
        canvas.drawBitmap(mBitmap, 0, 0, null);
        //画经过Matrix变化后的图
        canvas.drawBitmap(mBitmap, mMatrix, null);
        super.onDraw(canvas);
    }
    @Override
    public void setImageMatrix(Matrix matrix) {
        System.out.println("---> setImageMatrix");
        this.mMatrix.set(matrix);
        super.setImageMatrix(matrix);
    }

    public Bitmap getBitmap(){
        System.out.println("---> getBitmap");
        return mBitmap;
    }

}

main.xml如下：

<RelativeLayout 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"
    >

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/hello_world" />

</RelativeLayout>