Java 如果用户已从存储目录中删除了项目表单recyclerview，如何删除它？

下面是我尝试的代码

import android.os.FileObserver;
import android.support.annotation.Nullable;
import android.util.Log;

public class ObserveFiles extends FileObserver {
public RecyclerViewAdapter recyclerViewAdapter;

public String absolutePath;

public ObserveFiles(String path) {
    super(path, FileObserver.ALL_EVENTS);

    absolutePath = path;
}

@Override
public void onEvent(int event, @Nullable String path) {

    if (path == null) {
        return;
    }
    //a new file or subdirectory was created under the monitored directory
    if ((FileObserver.DELETE & event)!=0) {
        Log.d("Deleted---------->", "File Deleted [" + absolutePath +  "/" + path + "]");
        String filepath = absolutePath + "/" + path;
        recyclerViewAdapter.removeOutOfApp(filepath);
    }

    //data was written to a file
    if ((FileObserver.MODIFY & event)!=0) {
        Log.d("Deleted---------->", "File Modified [" + absolutePath  +  "/" + path + "]");
    }

    //the monitored file or directory was deleted, monitoring effectively stops
    if ((FileObserver.DELETE_SELF & event)!=0) {
        Log.d("Deleted---------->", "File Self Deleted [" + absolutePath + "/URecorder" +  "/" + path + "]");
    }

    //a file or directory was opened
    if ((FileObserver.MOVED_TO & event)!=0) {
        Log.d("Deleted---------->", "File Moved To [" +  absolutePath  +  "/" + path  + "]");
    }

    //a file or subdirectory was moved from the monitored directory
    if ((FileObserver.MOVED_FROM & event)!=0) {
        Log.d("Deleted---------->", "File Moved From [" + absolutePath  +  "/" + path + "]");
    }

    //the monitored file or directory was moved; monitoring continues
    if ((FileObserver.MOVE_SELF & event)!=0) {
        Log.d("Deleted---------->", "File Moved Self[" + absolutePath  + "/" +  path + "]");
    }

}
}

@Override
    protected void onResume() {
    super.onResume();

    String filePath = android.os.Environment.getExternalStorageDirectory().toString() + "/URecorder";
    observeFiles = new ObserveFiles(filePath);
    observeFiles.startWatching();
}

@Override
protected void onDestroy() {
    super.onDestroy();

    observeFiles.stopWatching();
}

欢迎来到SO！：）

以下是伪代码：

1） 删除：从RecyclerView中删除项目有4个步骤

list.remove(position);
recycler.removeViewAt(position);
mAdapter.notifyItemRemoved(position);                 
mAdapter.notifyItemRangeChanged(position, list.size());

这些代码行对我有用

2） 更新数据：我唯一要做的就是

mAdapter.notifyDataSetChanged();

所有这些都必须在Activity/Fragment代码中完成，而不是在RecyclerView适配器代码中完成

---

希望能有所帮助。

我不知道你的数据/文件数量，也不知道你在做什么任务。 但另一种可选方法是在

OnResume（）中加载数据。
如果用户
最小化应用程序>删除文件..>当应用程序出现在前台时，将再次调用onResume。

因此，每次它都会加载新数据，除非其他背景内容会删除该文件
 String path=“file://”+newfile[i].getAbsolutePath（）

文件=新文件（路径）

delete（）

这是直接从存储中删除文件的过程
如果用户从外部/内部存储目录中删除文件，我希望从回收器视图和sqlite中删除。否如果用户从存储目录中删除文件，我希望更新回收器视图