android textView特效

/**   * @Title: TwinkleTextView.java */package com.zero.view;import android.content.Context;import android.graphics.Canvas;import android.graphics.LinearGradient;import android.graphics.Matrix;import android.graphics.Paint;import android.graphics.Shader;import android.util.AttributeSet;import android.widget.TextView;/** * @ClassName: TwinkleTextView * @Description: 自定义移动闪光textview * @author ZeRo_Ci * @date 2014-5-6 下午12:54:46 *  */public class TwinkleTextView extends TextView {private LinearGradient mLinearGradient;private Matrix mMatrix;private Paint mPaint;private int mViewWidth = 0;private int mTranslate = 0;private boolean mAnimating = true;/** * @Description: 自定义移动闪光textview * @author ZeRo_Ci * @date 2014-5-6 下午12:55:05 */public TwinkleTextView(Context context, AttributeSet attributeSet) {super(context, attributeSet);}protected void onSizeChanged(int w, int h, int oldw, int oldh) {super.onSizeChanged(w, h, oldw, oldh);if (mViewWidth == 0) {// 获取textView的宽度mViewWidth = getMeasuredWidth();if (mViewWidth > 0) {mPaint = getPaint();// ↓↓↓关于LinearGradient的使用参考一下博客↓↓↓：// http://www.apihome.cn/api/android/LinearGradient.html// http://blog.csdn.net/q445697127/article/details/7865504mLinearGradient = new LinearGradient(-mViewWidth, 0, 0, 0,new int[] { 0x33ffffff, 0xffffffff, 0x33ffffff },new float[] { 0, 0.5f, 1 }, Shader.TileMode.CLAMP);// 设置对象mPaint.setShader(mLinearGradient);mMatrix = new Matrix();}}}protected void onDraw(Canvas canvas) {super.onDraw(canvas);if (mAnimating && mMatrix != null) {mTranslate += mViewWidth / 10;if (mTranslate > 2 * mViewWidth) {mTranslate = -mViewWidth;}// 设置一个矩阵mMatrix.setTranslate(mTranslate, 0);mLinearGradient.setLocalMatrix(mMatrix);// 设置循环并指定时间postInvalidateDelayed(50);}}}// Shader类源码/** * Shader is the based class for objects that return horizontal spans of colors * during drawing. A subclass of Shader is installed in a Paint calling * paint.setShader(shader). After that any object (other than a bitmap) that is * drawn with that paint will get its color(s) from the shader. */// public abstract class Shader {//// private final Matrix mMatrix = new Matrix();//// public enum TileMode {// /**// * replicate the edge color if the shader draws outside of its// * original bounds// */// CLAMP(0),// /**// * repeat the shader's image horizontally and vertically// */// REPEAT(1),// /**// * repeat the shader's image horizontally and vertically,// * alternating mirror images so that adjacent images always seam// */// MIRROR(2);//// TileMode(int nativeInt) {// this.nativeInt = nativeInt;// }//// final int nativeInt;// }//// /**// * Return true if the shader has a non-identity local matrix.// *// * @param localM// * If not null, it is set to the shader's local matrix.// * @return true if the shader has a non-identity local matrix// */// public boolean getLocalMatrix(Matrix localM) {// if (localM != null) {// localM.set(mMatrix);// }//// return !mMatrix.isIdentity();// }//// /**// * Set the shader's local matrix. Passing null will reset the shader's// * matrix to identity// *// * @param localM// * The shader's new local matrix, or null to specify identity// */// public void setLocalMatrix(Matrix localM) {// if (localM != null) {// mMatrix.set(localM);// } else {// mMatrix.reset();// }// }//// /**// * Returns a java.awt.Paint object matching this shader.// */// abstract java.awt.Paint getJavaPaint();// }

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android textview特效

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