android录屏功能 android实现录屏小功能
poorSir 人气:4思路
android实现录屏功能有两种方案,一种是直接使用android自带的MediaProjectionManager实现录屏功能,第二种是是只录语音,用户的操作通过某种方式进行记录保存,最后通过某种协议进行播放。
两种方案各有各的优缺点,前者实现方式简单,但无法只录制特定区域的画面,并且生成的视频文件一般都比较大。后者实现较为繁琐,音频录制android7.0之前没有暂停方法,只能生成多个文件,然后对音频进行合成。用户的操作需要自己进行保存,播放时还原。播放器需要自定义生成。但后者的好处是可扩展性高,支持特定区域录制,并且生成的音频文件比较小。
需求
录制画板,画板要求可以更改颜色粗细,可以擦除。画板底部可以是白板,图片。图片要求是相机拍摄或者本地图片。可以播放录制内容;需要上传,所以文件要小,所有只能选择第二种方式。
github地址
整个项目生成的是一个文件夹,文件夹中包含一个MP3文件,一个cw协议文件(存储用户的操作),图片。整个画板是一个recyclerView,item中包含一个涂鸦画板,图片控件。播放时读取cw协议文件,按照时间一个个绘制,协议内容包含画板各个页的内容是空白画板还是图片,时间点,操作(切换图片/画线)。
音频
//开始录音 if (mMediaRecorder == null) { mMediaRecorder = new MediaRecorder(); } mMediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC); mMediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.AMR_NB); mMediaRecorder.setOutputFile(mRecordFilePath); mMediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);//amr_nb格式头部有6个字节的头信息 try { mMediaRecorder.prepare(); mMediaRecorder.start(); isRunning = true; AudioUtil.startAudio(); mHandler.sendEmptyMessageDelayed(MSG_TYPE_COUNT_DOWN, 1000); } catch (IOException e) { e.printStackTrace(); }
/** * 合成amr_nb编码的音频 * @param partsPaths * @param unitedFilePath */ public static void uniteAMRFile(List<String> partsPaths, String unitedFilePath) { try { File unitedFile = new File(unitedFilePath); FileOutputStream fos = new FileOutputStream(unitedFile); RandomAccessFile ra = null; for (int i = 0; i < partsPaths.size(); i++) { ra = new RandomAccessFile(partsPaths.get(i), "rw"); if (i != 0) { ra.seek(6); } byte[] buffer = new byte[1024 * 8]; int len = 0; while ((len = ra.read(buffer)) != -1) { fos.write(buffer,0,len); } File file = new File(partsPaths.get(i)); if(file.exists()){ file.delete(); } } if(ra!=null){ ra.close(); } fos.close(); } catch (Exception e) { e.printStackTrace(); } }
音频播放
mediaPlayer = new MediaPlayer(); mediaPlayer.setDataSource(path); mediaPlayer.prepare(); mediaPlayer.start();
recyclerView
是否禁止滑动
public class ForbitLayoutManager extends LinearLayoutManager { private boolean canScrollHorizon = true; private boolean canScrollVertical = true; public ForbitLayoutManager(Context context) { super(context); } public ForbitLayoutManager(Context context, int orientation, boolean reverseLayout) { super(context, orientation, reverseLayout); } public ForbitLayoutManager(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) { super(context, attrs, defStyleAttr, defStyleRes); } public void setCanScrollHorizon(boolean canScrollHorizon) { this.canScrollHorizon = canScrollHorizon; } public void setCanScrollVertical(boolean canScrollVertical) { this.canScrollVertical = canScrollVertical; } @Override public boolean canScrollHorizontally() { return canScrollHorizon && super.canScrollHorizontally(); } @Override public boolean canScrollVertically() { return canScrollVertical && super.canScrollVertically(); } }
滑动时只滑动一页类似viewPage
mPagerSnapHelper = new PagerSnapHelper(); mPagerSnapHelper.attachToRecyclerView(recyclerView);
获得当前是第几页,类似viewPage的pageSelect
public class RecyclerViewPageChangeListenerHelper extends RecyclerView.OnScrollListener { private SnapHelper snapHelper; private OnPageChangeListener onPageChangeListener; private int oldPosition = -1;//防止同一Position多次触发 public RecyclerViewPageChangeListenerHelper(SnapHelper snapHelper, OnPageChangeListener onPageChangeListener) { this.snapHelper = snapHelper; this.onPageChangeListener = onPageChangeListener; } @Override public void onScrolled(RecyclerView recyclerView, int dx, int dy) { super.onScrolled(recyclerView, dx, dy); if (onPageChangeListener != null) { onPageChangeListener.onScrolled(recyclerView, dx, dy); } } @Override public void onScrollStateChanged(RecyclerView recyclerView, int newState) { super.onScrollStateChanged(recyclerView, newState); int position = 0; RecyclerView.LayoutManager layoutManager = recyclerView.getLayoutManager(); //获取当前选中的itemView View view = snapHelper.findSnapView(layoutManager); if (view != null) { //获取itemView的position position = layoutManager.getPosition(view); } if (onPageChangeListener != null) { onPageChangeListener.onScrollStateChanged(recyclerView, newState); //newState == RecyclerView.SCROLL_STATE_IDLE 当滚动停止时触发防止在滚动过程中不停触发 if (newState == RecyclerView.SCROLL_STATE_IDLE && oldPosition != position) { oldPosition = position; onPageChangeListener.onPageSelected(position); } } } public interface OnPageChangeListener { void onScrollStateChanged(RecyclerView recyclerView, int newState); void onScrolled(RecyclerView recyclerView, int dx, int dy); void onPageSelected(int position); } }
获得当前选择的item(只能获得可视页面item)
View view = forbitLayoutManager.findViewByPosition(position); //有时会获取到null,是因为页面还没有渲染完成,可以使用 recyclerView.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver .OnGlobalLayoutListener() { @Override public void onGlobalLayout() { //会多次调用,执行完逻辑之后取消监听 recyclerView.getViewTreeObserver().removeOnGlobalLayoutListener(this); } });
根据时间进行播放
private void convertCWACT(CW cw, int seconds,boolean isSeek) { List<CWACT> cwacts = cw.getACT(); //如何是播放器跳转,先回到首页,清空所有item中的画板,防止从高时间跳转到低时间出现错误 if(isSeek){ position =0; forbitLayoutManager.scrollToPosition(position); forbitLayoutManager.setStackFromEnd(true); for(int i=0;i<recyclerViewList.size();i++){ View view = recyclerViewList.get(i); if(view!=null){ SimpleDoodleView doodleView = view.findViewById(R.id.doodleView); doodleView.clear(); } } } for (CWACT cwact : cwacts) { int time = cwact.getTime(); if(isSeek?time > seconds:time != seconds){ continue; } if ("switch".equals(cwact.getAction())) {//切换页面 position = cwact.getCwSwitch().getIndex(); forbitLayoutManager.scrollToPosition(position); forbitLayoutManager.setStackFromEnd(true); } else if ("line".equals(cwact.getAction())) {//划线 if(position>recyclerViewList.size()-1){ continue; } View view = recyclerViewList.get(position); if(view!=null){ SimpleDoodleView doodleView = view.findViewById(R.id.doodleView); doodleView.setDrawPath(cwact.getLine()); } } else if ("clear".equals(cwact.getAction())) {//清屏 if(position>recyclerViewList.size()-1){ continue; } View view = recyclerViewList.get(position); if(view!=null){ SimpleDoodleView doodleView = view.findViewById(R.id.doodleView); doodleView.clear(); } } } }
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