Android录制按钮源码解析 Android录制按钮源码解析

本文实例为大家分享了Android实现录制按钮的具体代码，供大家参考，具体内容如下
初始化
布局文件中参数

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(); }

画笔初始化

// 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); }

内部正方形RectF初始化

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

内部正方形所需动画初始化, 当开始录制或者结束录制时候,内部正方形会有一个动画效果,这个动画效果需要内部正方形边长改变才能实现.

/** * 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() {@Overridepublic void onAnimationEnd(Animator animation) {//动画结束isAnimRuning = false; }@Overridepublic 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() {@Overridepublic void onAnimationUpdate(ValueAnimator animation) {//动态获取正方形边长mTempRectSize = (float) animation.getAnimatedValue(); invalidate(); //重绘}}); }

确定圆形半径,圆心坐标,内部正方形边长等

@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; } }

绘制内部正方形和外圆

@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); }

录制开始和结束方法以及动画执行方法

/** * 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0mCurrent = 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(); }

回调接口

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); }

对控件点击事件进行处理

@Overridepublic 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0if (!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 < mShortest && mCurrent >= 1) {if (rbyCb != null) {rbyCb.lessShortTimeRecode(String.valueOf(mCurrent)); }}break; }return true; //消费事件}

屏幕旋转保存与还原数据

//屏幕旋转时候保存必要的数据@Nullable@Overrideprotected 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(); }}@Overrideprotected 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); }

定时mHandler

@SuppressLint("HandlerLeak")private Handler mHandler = new Handler() {@Overridepublic 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); }}};

页面销毁处理

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

效果图