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.
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"/>
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,-1f,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,1f,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 }; 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,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>