Android中TextView和ImageView实现倾斜效果

public class MyTextView extends TextView{    public MyTextView(Context context, AttributeSet attrs) {     super(context, attrs);   }    @Override   protected void onDraw(Canvas canvas) {     //倾斜度45,上下左右居中     canvas.rotate(-45, getMeasuredWidth()/2, getMeasuredHeight()/2);     super.onDraw(canvas);   }    } 

<com.peace.test.incline_textview.MyTextView     android:layout_width="100dip"     android:layout_height="100dip"     android:gravity="center"     android:text="@string/hello_world"/> 

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);    }   }  }  } 

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;  }  } 

<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>