android录屏功能

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

android录屏功能_第1张图片

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 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(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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