Android Studio 无法解析“视图”

Question

最近我遇到了一个错误，尽管我的 gradle 和 import 中有所需的一切，但我无法解决。我尝试重新启动应用程序，重新运行它并更改导入，但没有任何改变。 Android Studio 无法解析符号“视图”，与变量有关。也许是我错过的东西。我不知道。

以下是我认为需要的导入：

import android.view.View;
import android.view.ViewGroup;

我得到错误的代码：

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    // Inflate the layout for this fragment
    return inflater.inflate(R.layout.fragment_running, container, false);

    //Initialize views
    stepText = (TextView) view.findViewById(R.id.stepText);
    timeText = (TextView) view.findViewById(R.id.timeText);
    speedText = (TextView) view.findViewById(R.id.speedText);
    distanceText = (TextView) view.findViewById(R.id.distanceText);
    orientationText = (TextView) view.findViewById(R.id.orientationText);
    achievedText = (TextView) view.findViewById(R.id.achievedText);
    setViewDefaultValues();

    //Step counting and other calculations start when user presses "start" button
    final Button startButton = (Button) view.findViewById(R.id.startButton);
    if (startButton != null) {
        startButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (!active) {
                    startButton.setText(R.string.pause);
                    startButton.setBackgroundColor(ContextCompat.getColor(getActivity(), R.color.gray2));
                    sensorManager.registerListener(RunningFragment.this, stepDetectorSensor, SensorManager.SENSOR_DELAY_NORMAL);
                    sensorManager.registerListener(RunningFragment.this, accelerometer, SensorManager.SENSOR_DELAY_NORMAL);
                    sensorManager.registerListener(RunningFragment.this, magnetometer, SensorManager.SENSOR_DELAY_NORMAL);
                    startTime = SystemClock.uptimeMillis();
                    handler.postDelayed(timerRunnable, 0);
                    active = true;

                } else {
                    startButton.setText(R.string.start);
                    startButton.setBackgroundColor(ContextCompat.getColor(getActivity(), R.color.gray2));
                    sensorManager.unregisterListener(RunningFragment.this, stepDetectorSensor);
                    sensorManager.unregisterListener(RunningFragment.this, accelerometer);
                    sensorManager.unregisterListener(RunningFragment.this, magnetometer);
                    elapsedTime += timeInMilliseconds;
                    handler.removeCallbacks(timerRunnable);
                    active = false;
                }
            }
        });
    }

//Reset all calculations to 0
Button resetButton = (Button) view.findViewById(R.id.resetButton);
    resetButton.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        stepCount = 0;
        distance = 0;
        elapsedTime = 0;
        setViewDefaultValues();
    }
});

//Opens SettingsActivity where user can set the step record of the day
Button settingsButton = (Button) view.findViewById(R.id.settingsButton);
    settingsButton.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        Intent intent = new Intent(getActivity(), SettingsActivity.class);
        startActivity(intent);
    }
});

    return view;
}

一些截图：

Answer 1

问题是您在不使用视图的情况下返回视图。 你必须有一个视图的参考才能使用它。 替换代码如下。

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.fragment_running, container, false);
 //Initialize views
    stepText = (TextView) view.findViewById(R.id.stepText);
    timeText = (TextView) view.findViewById(R.id.timeText);
    speedText = (TextView) view.findViewById(R.id.speedText);
    distanceText = (TextView) view.findViewById(R.id.distanceText);
    orientationText = (TextView) view.findViewById(R.id.orientationText);
    achievedText = (TextView) view.findViewById(R.id.achievedText);
    setViewDefaultValues();

    //Step counting and other calculations start when user presses "start" button
    final Button startButton = (Button) view.findViewById(R.id.startButton);
    if (startButton != null) {
        startButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (!active) {
                    startButton.setText(R.string.pause);
                    startButton.setBackgroundColor(ContextCompat.getColor(getActivity(), R.color.gray2));
                    sensorManager.registerListener(RunningFragment.this, stepDetectorSensor, SensorManager.SENSOR_DELAY_NORMAL);
                    sensorManager.registerListener(RunningFragment.this, accelerometer, SensorManager.SENSOR_DELAY_NORMAL);
                    sensorManager.registerListener(RunningFragment.this, magnetometer, SensorManager.SENSOR_DELAY_NORMAL);
                    startTime = SystemClock.uptimeMillis();
                    handler.postDelayed(timerRunnable, 0);
                    active = true;

                } else {
                    startButton.setText(R.string.start);
                    startButton.setBackgroundColor(ContextCompat.getColor(getActivity(), R.color.gray2));
                    sensorManager.unregisterListener(RunningFragment.this, stepDetectorSensor);
                    sensorManager.unregisterListener(RunningFragment.this, accelerometer);
                    sensorManager.unregisterListener(RunningFragment.this, magnetometer);
                    elapsedTime += timeInMilliseconds;
                    handler.removeCallbacks(timerRunnable);
                    active = false;
                }
            }
        });
return view;
}