方法findViewById(int)在Get Data Fragment for Accelerometer Sensor类型中未定义。

Question

我正在进行一个在安卓平台上使用加速度计传感器获取数据的项目。但是，在最后三行代码中出现了错误代码。具体来说，findViewById不能用于获取数据片段。那么，我如何在片段中使用findViewById来获取加速度传感器数据呢？非常感谢您的回答:)

import android.app.Activity;
import android.app.Fragment;
import android.content.Context;
import android.hardware.Sensor;
import android.hardware.SensorManager;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.TextureView;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorManager;
import android.hardware.SensorEventListener;


public class GetDataFragment extends Fragment implements SensorEventListener {

//definisi variabel-variabel
//Sensor accelerometer;
private Activity parent;
TextView koordinatX;
TextView koordinatY;
TextView koordinatZ;

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    return inflater.inflate(R.layout.get_data, container, false);
}

private SensorManager sensorManager;
private Sensor sensor;
//TextView koordinatX;


    @Override
public void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);

     parent = getActivity();


    sensorManager = (SensorManager) parent.getSystemService(Context.SENSOR_SERVICE);
    sensor = sensorManager.getSensorList(Sensor.TYPE_ACCELEROMETER).get(0);


    koordinatX = (TextView)findViewById(R.id.coordinatx);
    koordinatY = (TextView)findViewById(R.id.coordinaty);
    koordinatZ = (TextView)findViewById(R.id.coordinatz);


}

- user2080041

Answer 1

必须在 onCreateView() 中填充您的 Views ：

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {
    View rootView = inflater.inflate(R.layout.get_data, container, false);
    koordinatX = (TextView)rootView.findViewById(R.id.coordinatx);
    koordinatY = (TextView)rootView.findViewById(R.id.coordinaty);
    koordinatZ = (TextView)rootView.findViewById(R.id.coordinatz);
    return rootView;
}

希望这可以帮助您。

- Egor

---

我刚刚按照你的建议修改了代码，如下所示：public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View rootView = inflater.inflate(R.layout.get_data,container,false); //第6行 koordinatX = (TextView)rootView.findViewById(R.id.coordinatx); koordinatY = (TextView)rootView.findViewById(R.id.coordinaty); koordinatZ = (TextView)rootView.findViewById(R.id.coordinatz); return rootView;}但是出现了“第6行无法访问的代码”错误。 - user2080041

直接复制粘贴代码，你就犯了一个错误。 - Egor

好的，我刚刚做了，但是在包含以下内容的public void onCreate中仍然出现错误： koordinatX = (TextView)findViewById(R.id.coordinatx); koordinatY = (TextView)findViewById(R.id.coordinaty); koordinatZ = (TextView)findViewById(R.id.coordinatz); - user2080041