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This article mainly shows you "android how to achieve screencap small function", the content is easy to understand, clear, hope to help you solve doubts, the following let the editor lead you to study and learn "android how to achieve screencap small function" this article.

Train of thought

There are two ways to realize screencap in android, one is to directly use MediaProjectionManager of android to realize screencap, the other is to record voice only, the user's operation is recorded and saved in some way, and finally played through a certain protocol.

Each of the two schemes has its own advantages and disadvantages, the former is simple to implement, but can not only record the picture of a specific area, and the generated video files are generally large. The implementation of the latter is more tedious, there is no pause method before audio recording android7.0, can only generate multiple files, and then synthesize the audio. The user's operation needs to be saved and restored during playback. The player needs to be custom generated. But the advantage of the latter is that it has high scalability, supports recording in specific areas, and generates relatively small audio files.

Demand

Record artboard, artboard requirements can be changed color thickness, can be erased. The bottom of the drawing board can be a whiteboard, a picture. Pictures are required to be taken by a camera or a local picture. You can play the recording; you need to upload, so the file should be small, so you can only choose the second way. Github address

The whole project generates a folder that contains a MP3 file, a cw protocol file (which stores the user's actions), and pictures. The entire artboard is a recyclerView,item containing a graffiti artboard, picture control. Read cw protocol files during playback and draw them one by one according to time. The content of the protocol includes whether the contents of each page of the artboard are blank artboards or pictures, time points, operations (switching pictures / drawing lines).

Audio frequency

/ / start recording 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 format header try {mMediaRecorder.prepare (); mMediaRecorder.start (); isRunning = true; AudioUtil.startAudio (); mHandler.sendEmptyMessageDelayed (MSG_TYPE_COUNT_DOWN, 1000) } catch (IOException e) {e.printStackTrace ();}

/ * * synthesize amr_nb-encoded audio * @ param partsPaths * @ param unitedFilePath * / public static void uniteAMRFile (List 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 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 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 (viewviews null) {SimpleDoodleView doodleView = view.findViewById (R.id.doodleView); doodleView.setDrawPath (cwact.getLine ());}} else if ("clear" .equals (cwact.getAction () {/ / clear screen if (position > recyclerViewList.size ()-1) {continue;} View view = recyclerViewList.get (position); if (viewviews null) {SimpleDoodleView doodleView = view.findViewById (R.id.doodleView) DoodleView.clear ();}

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