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); } } 

 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; } }