Android录制按钮源码解析

 private void initParame(Context context, @Nullable AttributeSet attrs, int defStyleAttr) { TypedArray typedArray = context.obtainStyledAttributes(attrs, R.styleable.RButtonY, defStyleAttr, 0); //外圆和内部正方形之间的间距 mCircleOutMarginSize = typedArray.getDimensionPixelSize(R.styleable.RButtonY_rby_circle_out_margin, 5); //外圆画笔的宽度 mCircleWidth = typedArray.getDimensionPixelSize(R.styleable.RButtonY_rby_circle_width, 5); //外圆画笔的颜色 mCirclePaintColor = typedArray.getColor(R.styleable.RButtonY_rby_circle_paint_color, Color.YELLOW); //内部正方形画笔的颜色 mRectPaintColor = typedArray.getColor(R.styleable.RButtonY_rby_rect_paint_color, Color.RED); //内部正方形初始边长相对于外圆内切正方形边长比率 0-1 mRectRateStart = typedArray.getFloat(R.styleable.RButtonY_rby_rect_rate_start, 0.9f); //内部正方形结束边长相对于外圆内切正方形边长比率 0-1 mRectRateFinish = typedArray.getFloat(R.styleable.RButtonY_rby_rect_rate_fnish, 0.5f); //录制规定最短时间 mShortest = typedArray.getInteger(R.styleable.RButtonY_rby_short_time, 3); //录制规定最长时间 mLongest = typedArray.getInteger(R.styleable.RButtonY_rby_long_time, 10); typedArray.recycle(); }

 // Paint.Style.FILL设置只绘制图形内容 // Paint.Style.STROKE设置只绘制图形的边 // Paint.Style.FILL_AND_STROKE设置都绘制 private void initPaint() { //外圆画笔 mCirclePaint = new Paint(); mCirclePaint.setAntiAlias(true); mCirclePaint.setColor(mCirclePaintColor); mCirclePaint.setStyle(Paint.Style.STROKE); mCirclePaint.setStrokeWidth(mCircleWidth); //内部正方形画笔 mRectPaint = new Paint(); mRectPaint.setAntiAlias(true); mRectPaint.setColor(mRectPaintColor); mRectPaint.setStyle(Paint.Style.FILL_AND_STROKE); }

 private void initRect() { mRectF = new RectF(); }

 /** * 初始化动画 * 这里对动画进行监听, 获取正方形边长随动画改变的值,然后重绘 */ private void initAnimator() { mAnimator = new ValueAnimator(); /** * onAnimationStart() - 当动画开始的时候调用. * onAnimationEnd() - 动画结束时调用. * onAnimationRepeat() - 动画重复时调用. * onAnimationCancel() - 动画取消时调用.取消动画也会调用onAnimationEnd，它不会关系动画是怎么结束的。 */ mAnimator.addListener(new AnimatorListenerAdapter() { @Override public void onAnimationEnd(Animator animation) { //动画结束 isAnimRuning = false; } @Override public void onAnimationStart(Animator animation) { //动画开始 isAnimRuning = true; } }); //动画进度监听,获取正方形随动画变化的边长,然后重绘 mAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() { @Override public void onAnimationUpdate(ValueAnimator animation) { //动态获取正方形边长 mTempRectSize = (float) animation.getAnimatedValue(); invalidate();//重绘 } }); }

 @Override protected void onLayout(boolean changed, int left, int top, int right, int bottom) { super.onLayout(changed, left, top, right, bottom); int width = getWidth(); int height = getHeight(); //圆心坐标 centerX = width / 2; centerY = height / 2; //半径 radius = Math.min(centerX, centerY) - mCircleOutMarginSize / 2; //pow 平方，sqrt 开方 //正方形开始边长,圆形直径的平方除以二再开放,为正方形边长. mRectStartSize = (int) (Math.sqrt(Math.pow(radius * 2, 2) / 2) * mRectRateStart); //正方形结束边长 mRectEndSize = (int) (mRectStartSize * mRectRateFinish); //mTempRectSize == 0 时, 即第一创建该View. if (mTempRectSize == 0) { //如果屏幕旋转,onLayout将被回调,此时并不希望mTempRectSize被重新赋值为mRectStartSize(开始状态). //所以只有当第一次创建时,才需要为mTempRectSize赋值为mRectStartSize(开始状态) mTempRectSize = mRectStartSize; } }

 @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); //外圆绘制 canvas.drawCircle(centerX, centerY, radius, mCirclePaint); //正方形四点坐标 int mLeftRectTemp = (int) (centerX - mTempRectSize / 2); int mRightRectTemp = (int) (centerX + mTempRectSize / 2); int mTopRectTemp = (int) (centerY + mTempRectSize / 2); int mButtonRectTemp = (int) (centerY - mTempRectSize / 2); //绘制正方形 mRectF.set(mLeftRectTemp, mTopRectTemp, mRightRectTemp, mButtonRectTemp); //(float) Math.sqrt(radius): 圆角半径 canvas.drawRoundRect(mRectF, (float) Math.sqrt(radius), (float) Math.sqrt(radius), mRectPaint); }

 /** * 录制开始 */ private void recordStart() { //正方形开始动画 startAnimation(mRectStartSize, mRectEndSize); if (rbyCb != null) { //录制开始的回调 rbyCb.startCb(String.valueOf(mCurrent)); } //开始计时 mHandler.sendEmptyMessage(0); //录制标识为开始 up = true; mTempRectSize = mRectEndSize; } /** * 录制结束 */ private void recordFinish() { //正方形结束动画 startAnimation(mRectEndSize, mRectStartSize); if (rbyCb != null) { //结束时回调 rbyCb.finishCb(String.valueOf(mCurrent)); } //录制结束,当前时间归0 mCurrent = 0; mHandler.removeCallbacksAndMessages(null); //录制标识为结束 up = false; mTempRectSize = mRectStartSize; } /** * 开始动画 * * @param startValue * @param endValue */ private void startAnimation(float startValue, float endValue) mAnimator.setFloatValues(startValue, endValue); mAnimator.setDuration(100); mAnimator.setInterpolator(new LinearInterpolator()); mAnimator.start(); }

 public interface RBYCallback { /** * 记录结束的回调 * * @param current */ void finishCb(String current); /** * 每一秒 都会触发该回调 * * @param current */ void eventCb(String current); /** * 开始记录的回调 */ void startCb(String current); /** * 录制时长小于录制最短要求时间之时,用户点击按钮时候,回调该方法 */ void lessShortTimeRecode(String current); }

 @Override public boolean onTouchEvent(MotionEvent event) { switch (event.getAction()) { case MotionEvent.ACTION_UP: //如果正方形动画正在播放，就拒绝按钮点击 if (isAnimRuning) return true; //up为false代表未开始记录,true 代表开始记录 //未开始记录时,mCurrent是等于0 if (!up && mCurrent == 0) { recordStart(); } //已开始记录,并且当前录制时间大于或者等于所设置的最短记录时长,则按钮可以手动结束 if (up && mCurrent >= mShortest) { recordFinish(); } //已开始记录,当前录制时间小于所设置的最短记录时长,并且录制时间大于1,则回调方法通知当前还不能手动结束录制 if (up && mCurrent = 1) { if (rbyCb != null) { rbyCb.lessShortTimeRecode(String.valueOf(mCurrent)); } } break; } return true;//消费事件 }

 //屏幕旋转时候保存必要的数据 @Nullable @Override protected Parcelable onSaveInstanceState() { if (mCurrent != 0) { Bundle bundle = new Bundle(); //保存系统其他原有的状态信息 bundle.putParcelable("instance", super.onSaveInstanceState()); //保存当前的一些状态 bundle.putFloat("rect_size", mTempRectSize);//保存方形边长 bundle.putBoolean("up", up);//当前录制状态 bundle.putInt("mCurrent", mCurrent);//当前录制时间 return bundle; } else { return super.onSaveInstanceState(); } } @Override protected void onRestoreInstanceState(Parcelable state) { //判断state的类型是否为bundle,若是则从bundle中取数据 if (state instanceof Bundle) { Bundle bundle = (Bundle) state; mTempRectSize = bundle.getFloat("rect_size"); up = bundle.getBoolean("up"); mCurrent = bundle.getInt("mCurrent"); //开始计时 mHandler.sendEmptyMessage(0); super.onRestoreInstanceState(bundle.getParcelable("instance")); return; } super.onRestoreInstanceState(state); }

 @SuppressLint("HandlerLeak") private Handler mHandler = new Handler() { @Override public void handleMessage(@NonNull Message msg) { super.handleMessage(msg); mCurrent++; if (rbyCb != null) { rbyCb.eventCb(String.valueOf(mCurrent)); } if (mCurrent >= mLongest) {//当前记录时间大于或等于最大记录时间，将自动结束记录 recordFinish(); } else { mHandler.sendEmptyMessageDelayed(0, 1000); } } };

 //页面销毁,清空消息,防止内存泄漏 @Override protected void onDetachedFromWindow() { super.onDetachedFromWindow(); mHandler.removeCallbacksAndMessages(null); mHandler = null; }