android.os.FileObserver#CLOSE_WRITE源码实例Demo

@Override
public void onEvent(int eventType, @Nullable String relativePath) {
  if (relativePath == null || eventType != FileObserver.CLOSE_WRITE) {
    return;
  }

  logger.log(
      SentryLevel.DEBUG,
      "onEvent fired for EnvelopeFileObserver with event type %d on path: %s for file %s.",
      eventType,
      this.rootPath,
      relativePath);

  // TODO: Only some event types should be pass through?

  final CachedEnvelopeHint hint = new CachedEnvelopeHint(flushTimeoutMillis, logger);
  envelopeSender.processEnvelopeFile(this.rootPath + File.separator + relativePath, hint);
}
 

private void startWatching() {
    final String pathToWatch = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DCIM).getAbsolutePath();

    observer = new RecursiveFileObserver(pathToWatch, FileObserver.CLOSE_WRITE| FileObserver.MOVED_TO) { // set up a file observer to watch this directory on sd card
        @Override
        public void onEvent(int event, final String mediaPath) {
            if (mediaPath != null && (!mediaPath.equals(".probe"))) { // check that it's not equal to .probe because thats created every time camera is launched

                new Handler(Looper.getMainLooper()).post(new Runnable() {
                    @Override
                    public void run() {

                        if (mediaPath.endsWith(".mp4"))
                            handleNewVideo(mediaPath);
                    }
                });
            }
        }
    };
    observer.startWatching();


}
 

@Override
public void onEvent(int event, String path) {
    // this will automatically update the directory when an action like this
    // will be performed
    switch (event & FileObserver.ALL_EVENTS) {
        case FileObserver.CREATE:
        case FileObserver.CLOSE_WRITE:
        case FileObserver.MOVE_SELF:
        case FileObserver.MOVED_TO:
        case FileObserver.MOVED_FROM:
        case FileObserver.ATTRIB:
        case FileObserver.DELETE:
        case FileObserver.DELETE_SELF:
            sHandler.removeCallbacks(mLastRunnable);
            sHandler.post(mLastRunnable =
                    new NavigateRunnable((AbstractBrowserActivity) getActivity(), path));
            break;
    }
}
 

/**
 * Receives and processes events about updates of the monitor folder and its children files.
 * 
 * @param event     Kind of event occurred.
 * @param path      Relative path of the file referred by the event.
 */
@Override
public void onEvent(int event, String path) {
    Log_OC.d(TAG, "Got event " + event + " on FOLDER " + mPath + " about "
            + ((path != null) ? path : ""));
    
    boolean shouldSynchronize = false;
    synchronized(mObservedChildren) {
        if (path != null && path.length() > 0 && mObservedChildren.containsKey(path)) {
            
            if (    ((event & FileObserver.MODIFY) != 0) ||
                    ((event & FileObserver.ATTRIB) != 0) ||
                    ((event & FileObserver.MOVED_TO) != 0) ) {
                
                if (!mObservedChildren.get(path)) {
                    mObservedChildren.put(path, Boolean.valueOf(true));
                }
            }
            
            if ((event & FileObserver.CLOSE_WRITE) != 0 && mObservedChildren.get(path)) {
                mObservedChildren.put(path, Boolean.valueOf(false));
                shouldSynchronize = true;
            }
        }
    }
    if (shouldSynchronize) {
        startSyncOperation(path);
    }
    
    if ((event & IN_IGNORE) != 0 &&
            (path == null || path.length() == 0)) {
        Log_OC.d(TAG, "Stopping the observance on " + mPath);
    }
    
}
 

public SettingsFileObserver(int userHandle, String path) {
    super(path, FileObserver.CLOSE_WRITE |
          FileObserver.CREATE | FileObserver.DELETE |
          FileObserver.MOVED_TO | FileObserver.MODIFY);
    mUserHandle = userHandle;
    mPath = path;
}
 

private void setupFileObserver(File directory) {
    mFileObserver = new FileObserver(directory.getAbsolutePath()) {
        @Override
        public void onEvent(int event, String s) {
            if (s != null && s.equals(mOutputFile.getName()) && event == FileObserver.CLOSE_WRITE) {
                outputFileWrittenLatch.countDown();
            }
        }
    };
    mFileObserver.startWatching();
}
 

private void setupFileObserver(File directory) {
    mFileObserver = new FileObserver(directory.getAbsolutePath()) {
        @Override
        public void onEvent(int event, String s) {
            if (s != null && s.equals(mOutputFile.getName()) && event == FileObserver.CLOSE_WRITE) {
                outputFileWrittenLatch.countDown();
            }
        }
    };
    mFileObserver.startWatching();
}
 

public static String toString(final int event) {
    switch (event) {
        case FileObserver.ACCESS:
            return "ACCESS";
        case FileObserver.MODIFY:
            return "MODIFY";
        case FileObserver.ATTRIB:
            return "ATTRIB";
        case FileObserver.CLOSE_WRITE:
            return "CLOSE_WRITE";
        case FileObserver.CLOSE_NOWRITE:
            return "CLOSE_NOWRITE";
        case FileObserver.OPEN:
            return "OPEN";
        case FileObserver.MOVED_FROM:
            return "MOVED_FROM";
        case FileObserver.MOVED_TO:
            return "MOVED_TO";
        case FileObserver.CREATE:
            return "CREATE";
        case FileObserver.DELETE:
            return "DELETE";
        case FileObserver.DELETE_SELF:
            return "DELETE_SELF";
        case FileObserver.MOVE_SELF:
            return "MOVE_SELF";
        default:
            return "0x" + Integer.toHexString(event);
    }
}
 

public FileInitializedObserver(File directory, String ... filenames) {
    // MOVED_TO is required for the Tor case where the Tor process creates <target>.tmp,
    // writes to that file, then renames to <target>. There's no CLOSE_WRITE event for <target>.
    super(
        directory.getAbsolutePath(),
        FileObserver.MOVED_TO | FileObserver.CLOSE_WRITE);
    mTargetFilenames = new ArrayList<String>(Arrays.asList(filenames));
    mLatch = new CountDownLatch(mTargetFilenames.size());
}
 

@Override
public void onEvent(int event, final String path) {
	if (path == null) {
		return;
	}
	
	switch (event & FileObserver.ALL_EVENTS) {
	case FileObserver.CLOSE_WRITE:
		// Download complete, or paused when wifi is disconnected. Possibly reported more than once in a row.
		// Useful for noticing when a download has been paused. For completions, register a receiver for 
		// DownloadManager.ACTION_DOWNLOAD_COMPLETE.
		break;
	case FileObserver.OPEN:
		// Called for both read and write modes.
		// Useful for noticing a download has been started or resumed.
		break;
	case FileObserver.DELETE:
	case FileObserver.MOVED_FROM:
		// This video is lost never to return. Remove it.
		handler.post(new Runnable() {
			@Override
			public void run() {
				DatabaseHelper helper = dataService.getHelper();
				helper.removeDownloadFromDownloadManager(helper.getVideoForFilename(path));
			}
		});
		break;
	case FileObserver.MODIFY:
		// Called very frequently while a download is ongoing (~1 per ms).
		// This could be used to trigger a progress update, but that should probably be done less often than this.
		shouldPoll = true;
		break;
	}
}
 

@Override
public void onEvent(int event, String path) {
    String parse = null;

    switch(event) {
        case FileObserver.CREATE:
            parse = "file created";
            break;
        case FileObserver.MODIFY:
            parse = "file modified";
            break;
        case FileObserver.CLOSE_WRITE:
            parse = "file closed/writen";
            break;
        case FileObserver.ACCESS:
            //parse = "file accessed";
            break;
        case FileObserver.DELETE:
            parse = "file deleted";
            break;
        case FileObserver.OPEN:
            //parse = "file opened";
            break;
        case FileObserver.CLOSE_NOWRITE:
            //parse = "file closed/not writen";
            break;
        case FileObserver.ATTRIB:
            parse = "file attribs changed";
            break;
    }

    if(parse != null) {
        Logger.d(LOG, String.format("EVENT %d ON %s: %s", event, path, parse));
        //lsof_r1(path);

        ILogPack logPack = new ILogPack();
        logPack.put(Keys.FILE_EFFECTED, path);
        logPack.put(Keys.ACCESS_TYPE, parse);
        logPack.put(Keys.ACCESS_CODE, event);

        DeviceSucker.this.sendToBuffer(logPack);
    }
}
 

/**
 * Process picture - from example GDK
 */
private void processPictureWhenReady(final String picturePath) {
    final File pictureFile = new File(picturePath);

    if (pictureFile.exists()) {
        // The picture is ready; process it.
    } else {
        // The file does not exist yet. Before starting the file observer, you
        // can update your UI to let the user know that the application is
        // waiting for the picture (for example, by displaying the thumbnail
        // image and a progress indicator).
        final File parentDirectory = pictureFile.getParentFile();
        final FileObserver observer = new FileObserver(parentDirectory.getPath()) {
            // Protect against additional pending events after CLOSE_WRITE is
            // handled.
            private boolean isFileWritten;

            @Override
            public void onEvent(int event, String path) {
                if (!isFileWritten) {
                    // For safety, make sure that the file that was created in
                    // the directory is actually the one that we're expecting.
                    final File affectedFile = new File(parentDirectory, path);
                    isFileWritten = (event == FileObserver.CLOSE_WRITE
                        && affectedFile.equals(pictureFile));

                    if (isFileWritten) {
                        stopWatching();

                        // Now that the file is ready, recursively call
                        // processPictureWhenReady again (on the UI thread).
                        runOnUiThread(new Runnable() {
                            @Override
                            public void run() {
                                processPictureWhenReady(picturePath);
                            }
                        });
                    }
                }
            }
        };
        observer.startWatching();
    }
}