自定义View之 继承View2

类似音频播放器的动感条

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.graphics.Shader;import android.util.AttributeSet;import android.view.View;/** * Created by Administrator on 2017/7/24 0024. */public class NewView2 extends View{    int mRectCount = 20;    int mWidth = 20 ;    int offset = 10;    double mRandom;    //矩形条的宽度    int mRectWidth =10;    int mRectHight = 50;    Paint mPaint;    LinearGradient mLinearGradient;    public NewView2(Context context, AttributeSet attrs)    {        super(context, attrs);        mPaint = new Paint();        //给画笔设置颜色        mPaint.setColor(getResources().getColor(android.R.color.holo_blue_bright));        mPaint.setStyle(Paint.Style.FILL);        mPaint.setStrokeWidth(4);    }    @Override    protected void onDraw(Canvas canvas)    {        super.onDraw(canvas);        for (int i = 0; i < mRectCount; i++)        {            mRandom = Math.random();            float currentHight = (float) (mRectHight * mRandom);            canvas.drawRect(                    (float) (mWidth * 0.4 / 2 + mRectWidth * i + offset),                    currentHight,                    (float) (mWidth * 0.4 / 2 + mRectWidth * (i + 1)),                    mRectHight,                    mPaint            );        }        postInvalidateDelayed(300);    }    @Override    protected void onSizeChanged(int w, int h, int oldw, int oldh)    {        super.onSizeChanged(w, h, oldw, oldh);        mWidth = getWidth();        mRectHight = getHeight();        mRectWidth = (int) (mWidth * 0.6 / mRectCount);        mLinearGradient = new LinearGradient(                0,                0,                mRectWidth,                mRectHight,                Color.YELLOW,                Color.BLUE,                Shader.TileMode.CLAMP        );        mPaint.setShader(mLinearGradient);    }}