Android View之对现有控件进行拓展实例

package com.xiong.demo1;import android.content.Context;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.LinearGradient;import android.graphics.Matrix;import android.graphics.Paint;import android.graphics.Shader;import android.util.AttributeSet;import android.widget.TextView;/** * Created by xionglh on 2015/12/29. */public class CustTextView extends TextView {    private int mViewWith;    private int mTranleate;    private Paint mPaint;    private LinearGradient mLinearGradient;    private Matrix mMatrix;    public CustTextView(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 (mViewWith == 0) {            mViewWith = getMeasuredWidth();            if (mViewWith > 0) {                mPaint = getPaint();                /**                 * LinearGradient第一个和第二个参数表示颜色渐变的起点 第三、第四表示颜色渐变的终点 第五个参数表示渐变的颜色                 * 第六个参数可以为空,表示坐标,值为0-1 new float[] {0.25f, 0.5f, 0.75f, 1 }                 *如果这是空的，颜色均匀分布，沿梯度线                 *  第七个表示平铺方式                 * CLAMP重复最后一个颜色至最后                 * MIRROR重复着色的图像水平或垂直方向已镜像方式填充会有翻转效果                 *REPEAT重复着色的图像水平或垂直方向                 */                mLinearGradient = new LinearGradient(0, 0, mViewWith, 0,                        new int[]{Color.parseColor("#7B68EE"), Color.parseColor("#FFC0CB"), Color.parseColor("#7B68EE")},                        null, Shader.TileMode.MIRROR);                mPaint.setShader(mLinearGradient);                mMatrix = new Matrix();            }        }    }    @Override    protected void onDraw(Canvas canvas) {        super.onDraw(canvas);        if (mMatrix != null) {            mTranleate += mViewWith / 14;            if (mTranleate > 2 * mViewWith) {                mTranleate = -mViewWith;            }            mMatrix.setTranslate(mTranleate, 0);            mLinearGradient.setLocalMatrix(mMatrix);            postInvalidateDelayed(100);        }    }}
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