本文实例为大家分享了android实现录屏小功能的具体代码,供大家参考,具体内容如下
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
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//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(); } |
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/** * 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
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mediaPlayer = new MediaPlayer(); mediaPlayer.setDataSource(path); mediaPlayer.prepare(); mediaPlayer.start(); |
recyclerView
是否禁止滑动
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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
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mPagerSnapHelper = new PagerSnapHelper(); mPagerSnapHelper.attachToRecyclerView(recyclerView); |
获得当前是第几页,类似viewPage的pageSelect
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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)
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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
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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(); } } } } |
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持服务器之家。
原文链接:https://blog.csdn.net/qq_31433525/article/details/101533832