对现有控件进行拓展

写的带有带有背景和边框

package com.example.administrator.youku_animi.MyView;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.LinearGradient;
import android.graphics.Paint;
import android.widget.TextView;

/**
 * Created by Administrator on 2017/7/22 0022.
 */

public class MyTextView extends TextView
{
    Paint mPaint1 = null;
    Paint mPaint2 = null;

    LinearGradient mLinearGradient = null;
    public MyTextView(Context context)
    {
        super(context);
    }

    @Override
    protected void onDraw(Canvas canvas)
    {
        mPaint1 = new Paint();
        mPaint1.setColor(getResources().getColor(android.R.color.holo_blue_light));
        mPaint1.setStyle(Paint.Style.FILL);
        mPaint2 = new Paint();
        mPaint2.setColor(Color.YELLOW);
        mPaint2.setStyle(Paint.Style.FILL);
        //Preconcat the current matrix with the specified translation 
        canvas.drawRect(
                0,
                0,
                getMeasuredWidth(),
                getMeasuredHeight(),
                mPaint1
        );
        canvas.drawRect(
                10,
                10,
                getMeasuredWidth() - 10,
                getMeasuredHeight() - 10,
                mPaint2
        );
        //Saves the current matrix and clip onto a private stack.
        canvas.save();
        //Preconcat the current matrix with the specified translation 
        canvas.translate(10, 0);
        super.onDraw(canvas);
        //This call balances a previous call to save(), and is used to remove all modifications to the matrix/clip state since the last save call.
        canvas.restore();
    }
}

闪动字体的TextView

package com.example.administrator.youku_animi.MyView;

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.widget.TextView;

/**
 * Created by Administrator on 2017/7/22 0022.
 */

public class MyTextView2 extends TextView
{
    int mTranslate ;
    int mViewWidth;
    LinearGradient mLinearGradient = null;
    Paint mPaint;
    Matrix matrix = null, matrix1;
    public MyTextView2(Context context)
    {
        super(context);
    }

    @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(
                        0,
                        0,
                        mViewWidth,
                        0,
                        new int[]{
                                Color.RED,
                                0xffffffff,
                                Color.BLUE
                        },
                        null,
                        Shader.TileMode.REPEAT
                );
                mPaint.setShader(mLinearGradient);
                matrix = new Matrix();


            }
        }
    }

    @Override
    protected void onDraw(Canvas canvas)
    {
        super.onDraw(canvas);
        if (matrix != null)
        {
            mTranslate += mViewWidth / 10;
        }
        matrix.setTranslate(mTranslate, 0);
        mLinearGradient.setLocalMatrix(matrix);
        postInvalidateDelayed(100);
    }
}