不能从静态内容引用非静态方法 checkWriteStoragePermission() [重复]

Question

我正在尝试从类中调用位于片段中的方法。现在我收到错误消息：无法从静态内容中引用非静态方法 checkWriteStoragePermission()。我真的没主意了。我现在在谷歌上搜索了大约 2 天，没有任何结果。

我试图调用该方法的类：

public class MyFirebaseMessagingService extends FirebaseMessagingService {

public static String sRecordDate;

public void onMessageReceived(RemoteMessage remoteMessage) {

    Intent intent = new Intent(this,MainActivity.class);
    intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
    PendingIntent pendingIntent = PendingIntent.getActivity(this,0,intent,PendingIntent.FLAG_ONE_SHOT);
    NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(this);
    notificationBuilder.setContentTitle("FCM NOTIFICATION");
    notificationBuilder.setContentText(remoteMessage.getNotification().getBody());
    notificationBuilder.setAutoCancel(true);
    notificationBuilder.setSmallIcon(R.mipmap.ic_launcher);
    notificationBuilder.setContentIntent(pendingIntent);
    NotificationManager notificationManager = (NotificationManager)getSystemService(Context.NOTIFICATION_SERVICE);
    notificationManager.notify(0,notificationBuilder.build());

    for (Map.Entry<String, String> entry : remoteMessage.getData().entrySet()) {
        String key = entry.getKey();
        String value = entry.getValue();

        Log.d(":", "key, " + key + " value " + value);

        sRecordDate = value;

        RecordingMode.checkWriteStoragePermission(); //HERE I AM GETIING THE ERROR
    }
}

Fragment 类中的方法：

    public void checkWriteStoragePermission() {
    if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
        if(ContextCompat.checkSelfPermission(getActivity(), android.Manifest.permission.WRITE_EXTERNAL_STORAGE)
                == PackageManager.PERMISSION_GRANTED) {
            mIsRecording = true;
            try {
                createVideoFileName();
            } catch (IOException e) {
                e.printStackTrace();
            }
            startRecord();
            mMediaRecorder.start();
            mChronometer.setBase(SystemClock.elapsedRealtime());
            mChronometer.setVisibility(View.VISIBLE);
            mChronometer.start();
        } else {
            if(shouldShowRequestPermissionRationale(android.Manifest.permission.WRITE_EXTERNAL_STORAGE)) {
                Toast.makeText(getActivity(), "app needs to be able to save videos", Toast.LENGTH_SHORT).show();
            }
            requestPermissions(new String[]{android.Manifest.permission.WRITE_EXTERNAL_STORAGE}, REQUEST_WRITE_EXTERNAL_STORAGE_PERMISSION_RESULT);
        }
    } else {
        mIsRecording = true;
        try {
            createVideoFileName();
        } catch (IOException e) {
            e.printStackTrace();
        }
        startRecord();
        mMediaRecorder.start();
        mChronometer.setBase(SystemClock.elapsedRealtime());
        mChronometer.setVisibility(View.VISIBLE);
        mChronometer.start();
    }
}

如何轻松解决此问题？因为我无法将其转换为静态方法。

亲切的问候，

Answer 1

但是您正在使用此方法，就好像它是静态方法（通过类的名称调用它），创建您拥有此方法的类的实例并在该实例上调用它。你说它是 `Fragment' 类，那么：

Fragment fragment = new Fragment();
fragment.checkWriteStoragePermission();

Answer 2

您的方法checkWriteStoragePermission 不是static，但您尝试直接从您的服务调用它。 尝试编辑这样的方法：

public static void checkWriteStoragePermission() {
....
}