【音视频】播放音频能量跳动状态柱状View

引言

做音视频类的APP，大多都会遇到一个需要用的VIEW，那就是
一般简单点，我们就搞个帧动画，UI 切切切就完事，这是最简单的，也是成效最快的，缺点就是一直循环的几张图。
另一种情况就是手写VIEW，这样更高大上点，效果看起来也比较好，而且颜色以及柱的数量高度可以随意定制。

自定义VIEW

public class AudioColumnView extends View {
    private int columnNum = 5;
    private int random;
    private boolean isStart = true;
    private Random mRandom;
    private int mRect_t1;
    private int mRect_t2;
    private int mRect_t3;
    private int mRect_t4;
    private int mRect_t5;
    private Handler mHandler = new Handler(){
        @Override
        public void handleMessage(Message msg) {
            if (msg.what == 0x1234) {
                invalidate();
            }
        }
    };
    private Paint mPaint;
    private int mWidth;
    private int mHeight;
    private double mRect_w;
    private RectF r1;
    private RectF r2;
    private RectF r3;
    private RectF r4;
    private RectF r5;
    public AudioColumnView(Context context) {
        this(context, null);
    }

    public AudioColumnView(Context context, AttributeSet attrs) {
        this(context, attrs, -1);
    }

    public AudioColumnView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        init();
    }

    private void init() {
        mRandom = new Random();
        mPaint = new Paint();
        mPaint.setColor(getResources().getColor(R.color.orange));
        mPaint.setStyle(Paint.Style.FILL);
        r1 = new RectF();
        r2 = new RectF();
        r3 = new RectF();
        r4 = new RectF();
        r5 = new RectF();
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        mWidth = MeasureSpec.getSize(widthMeasureSpec);
        mHeight = MeasureSpec.getSize(heightMeasureSpec);
        mRect_w = mWidth/(2*columnNum+1);
        random =mHeight / 5;
    }

    public void start(){
        isStart = true;
        invalidate();
    }

    public void stop(){
        isStart = false;
        invalidate();
    }

    public boolean isStart(){
        return isStart;
    }


    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        if (isStart) {
            new Timer().schedule(new TimerTask() {
                @Override
                public void run() {
                    mRect_t1 = mRandom.nextInt(random);
                    mRect_t2 = mRandom.nextInt(random);
                    mRect_t3 = mRandom.nextInt(random);
                    mRect_t4 = mRandom.nextInt(random);
                    mRect_t5 = mRandom.nextInt(random);
                    mHandler.sendEmptyMessage(0x1234);
                }
            },200);
        }
        r1.set((float) (mRect_w),mRect_t1*5,(float)( mRect_w*2),(float) (mHeight*0.9));
        r2.set((float) (mRect_w*3),mRect_t2*5,(float)(mRect_w*4),(float) (mHeight*0.9));
        r3.set((float) (mRect_w*5),mRect_t3*5,(float)(mRect_w*6),(float) (mHeight*0.9));
        r4.set((float) (mRect_w*7),mRect_t4*5,(float)( mRect_w*8),(float) (mHeight*0.9));
        r5.set((float) (mRect_w*9),mRect_t5*5,(float)(mRect_w*10),(float) (mHeight*0.9));
        canvas.drawRect(r1,mPaint);
        canvas.drawRect(r2,mPaint);
        canvas.drawRect(r3,mPaint);
        canvas.drawRect(r4,mPaint);
        canvas.drawRect(r5,mPaint);
    }
}