文件观察器 onEvent() 中的 startActivity() 出现问题

Trouble with startActivity() in file observers onEvent()

我有一个 fileObserver 运行,现在我需要在 onEvent 被调用后启动一个 activity,考虑到我无法获得,我不太确定该怎么做startActivity().

这是我当前的代码:

public class snapObserver extends FileObserver {

public final String TAG = "DEBUG";
public static Context mContext;

public snapObserver(String path) {
    super(path, FileObserver.CREATE);
}

@Override
public void onEvent(int event, String path) {
    if (path == null){
        Log.d(TAG, "path is null");
    }

    Log.d(TAG, "File created!!!!");
    mContext.startActivity(new Intent(mContext, editActivity.class));
}
}

此代码抛出 java.lang.NullPointerException

java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String android.content.Context.getPackageName()' on a null object reference at android.content.ComponentName.(ComponentName.java:77) at android.content.Intent.(Intent.java:3996) at com.samplersnapshoot.domiq.samplersnapshoot.snapObserver.onEvent(snapObserver.java:28) at android.os.FileObserver$ObserverThread.onEvent(FileObserver.java:122) at android.os.FileObserver$ObserverThread.observe(Native Method) at android.os.FileObserver$ObserverThread.run(FileObserver.java:85)

我在后台有一个服务 运行,它通过简单的 startWatching 调用 fileObserver。

尝试这样做:

public class snapObserver extends FileObserer {
    private Context mContext;

    //any code

    public snapObserver(String path, Context context) {
        super(path, FileObserver.CREATE);

        this.mContext = context;
    }

    //any code
}