# android 让文字像波浪一样闪烁动画

package com.arong.tool;

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;

public class MyTextView extends TextView {

   private LinearGradient mLinearGradient;
   private Matrix mGradientMatrix;
   private Paint mPaint;
   private int mViewWidth = 0;
   private int mTranslate = 0;

private boolean mAnimating = true;

   public MyTextView(Context context, AttributeSet attrs) {
       super(context, attrs);
   }

   @Override
   protected void onSizeChanged(int w, int h, int oldw, int oldh) {
       super.onSizeChanged(w, h, oldw, oldh);
       if (mViewWidth == 0) {
           mViewWidth = getMeasuredWidth();
           if (mViewWidth > 0) {
               mPaint = getPaint();
               mLinearGradient = new LinearGradient(-mViewWidth, 0, 0, 0,
                       new int[] { 0x33ffffff, 0xffffffff, 0x33ffffff },
                       new float[] { 0, 0.5f, 1 }, Shader.TileMode.CLAMP);
               mPaint.setShader(mLinearGradient);
               mGradientMatrix = new Matrix();
           }
       }
   }

   @Override
   protected void onDraw(Canvas canvas) {
       super.onDraw(canvas);
       if (mAnimating && mGradientMatrix != null) {
           mTranslate += mViewWidth / 10;
           if (mTranslate > 2 * mViewWidth) {
               mTranslate = -mViewWidth;
           }
           mGradientMatrix.setTranslate(mTranslate, 0);
           mLinearGradient.setLocalMatrix(mGradientMatrix);
           postInvalidateDelayed(50);
       }
   }

}

更多相关文章

随机推荐