【Android】监听文件的创建

需求是监听到指定目录创建文件后，将其移动到其他目录，并将原文件无效化。因为直接删除会在通知栏提示，不得已采用此方法
这里我将华为截屏的图片移动到其他目录。
先上效果图

Gif.gif

其中的MP4文件是录屏文件。

监听文件，我用到了FileObserver

public class SDCardListener extends FileObserver {
    private static final String TAG = "SDCardListener";
    private Context mContext;
    public static String mSrcPath = "/storage/emulated/0/Pictures/Screenshots/";
    private String mDecPath = "/storage/emulated/0/Pictures/Dec/";

    public SDCardListener(String path, Context context) {
        super(path);
        this.mContext = context;
    }

    @Override
    public void onEvent(int event, @Nullable String path) {
        switch (event) {
            case FileObserver.CLOSE_WRITE:
                new Thread(new Runnable() {
                    @Override
                    public void run() {
                        if (!path.endsWith("jpg")) {
                            return;
                        }
                        File srcFile = new File(mSrcPath, path);
                        File decFile = new File(mDecPath, path);
                        FileUtil.fileChannelCopy(srcFile.getAbsolutePath(), decFile .getAbsolutePath());
                        SystemClock.sleep(1000);
                        srcFile.renameTo(new File(mSrcPath, "temp"));
                        srcFile = new File(mSrcPath, "temp");
                        FileOutputStream fileOutputStream = null;
                        try {
                            fileOutputStream = new FileOutputStream(srcFile);
                            fileOutputStream.write("".getBytes());
                            fileOutputStream.flush();
                        } catch (Exception e) {
                            e.printStackTrace();
                            Log.d(TAG, "CLOSE_WRITE e:" + e.getMessage());
                        } finally {
                            CloseableUtil.close(fileOutputStream);
                        }
                        // 这里要传截图的原路径（清除原图片）
                        MediaScannerConnection.scanFile(mContext, new String[]{VEnvironment.getScreenshotsSrcFile(path).getPath()}, null, null);
                    
                    }
                }).start();
        }
    }
}

我在服务onCreate的时候对其进行初始化监听

public class FileObserverService extends Service {
    private static final String TAG = "FileObserverService";
    private SDCardListener listener;


    @Nullable
    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        if (listener == null) {
            Log.i(TAG, "FileObserverService startWatching");
            listener = new SDCardListener(VEnvironment.getOutScreenshots(), getApplicationContext());
            //开始监听
            listener.startWatching();
        }
        return super.onStartCommand(intent, flags, startId);
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        if (listener != null) {
            Log.i(TAG, "FileObserverService stopWatching");
            listener.stopWatching();
            listener = null;
        }

    }
}

这样就完成了。