Android中TextView和ImageView实现倾斜效果

TextView倾斜：

想做一个倾斜的TextView,想海报上显示的那样 ,在网上找例子一直不能实现,看了看TextView源码,发现很简单,为方便像我一样糊涂的孩纸,贴出来了.

首先需要先自定义一个TextView

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); 
  } 
   
}

xml文件中添加上这个MyTextView

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

ImageView倾斜：

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>

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Android中TextView和ImageView实现倾斜效果

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