无法显示用户输入的时间

Question

所以我有一个时间选择器全部设置好了，它在我的应用程序中打开得很好。我可以选择时间，点击'完成'，它就像它应该的那样关闭。我现在想要输入时间并将其显示在XML文件中定义的TextView中。

我已经得到了这样做是使用这行代码最接近：

TextView textView = (TextView)getView().findViewById(R.id.timeOfWorkoutTextView); 

此代码至少不显示在Eclipse的错误，但我每次运行应用程序和打'完成'按钮，它会引发错误并关闭应用程序。下面是logcat的：

04-27 19:13:49.482: E/AndroidRuntime(11553): FATAL EXCEPTION: main 
04-27 19:13:49.482: E/AndroidRuntime(11553): java.lang.NullPointerException 
04-27 19:13:49.482: E/AndroidRuntime(11553): at com.example.test_project.TimePickerFragment.onTimeSet(TimePickerFragment.java:30) 
04-27 19:13:49.482: E/AndroidRuntime(11553): at android.app.TimePickerDialog.tryNotifyTimeSet(TimePickerDialog.java:130) 
04-27 19:13:49.482: E/AndroidRuntime(11553): at android.app.TimePickerDialog.onClick(TimePickerDialog.java:115) 
04-27 19:13:49.482: E/AndroidRuntime(11553): at com.android.internal.app.AlertController$ButtonHandler.handleMessage(AlertController.java:166) 
04-27 19:13:49.482: E/AndroidRuntime(11553): at android.os.Handler.dispatchMessage(Handler.java:99) 
04-27 19:13:49.482: E/AndroidRuntime(11553): at android.os.Looper.loop(Looper.java:137) 
04-27 19:13:49.482: E/AndroidRuntime(11553): at android.app.ActivityThread.main(ActivityThread.java:5059) 
04-27 19:13:49.482: E/AndroidRuntime(11553): at java.lang.reflect.Method.invokeNative(Native Method) 
04-27 19:13:49.482: E/AndroidRuntime(11553): at java.lang.reflect.Method.invoke(Method.java:511) 
04-27 19:13:49.482: E/AndroidRuntime(11553): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:792) 
04-27 19:13:49.482: E/AndroidRuntime(11553): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:555) 
04-27 19:13:49.482: E/AndroidRuntime(11553): at dalvik.system.NativeStart.main(Native Method) 
04-27 19:13:51.060: I/Process(11553): Sending signal. PID: 11553 SIG: 9 

我打算使用的StringBuilder创建一个包含小时和分钟的字符串，然后使用这样的：textView.setText（hourMinuteString）;

这里是我的所有代码：

package com.example.test_project; 

import java.util.Calendar; 

import android.app.Dialog; 
import android.app.DialogFragment; 
import android.app.TimePickerDialog; 
import android.os.Bundle; 
import android.text.format.DateFormat; 
import android.view.View; 
import android.widget.TextView; 
import android.widget.TimePicker; 

public class TimePickerFragment extends DialogFragment 
implements TimePickerDialog.OnTimeSetListener { 

@Override 
public Dialog onCreateDialog(Bundle savedInstanceState) { 
// Use the current time as the default values for the picker 
final Calendar c = Calendar.getInstance(); 
int hour = c.get(Calendar.HOUR_OF_DAY); 
int minute = c.get(Calendar.MINUTE); 

// Create a new instance of TimePickerDialog and return it 
return new TimePickerDialog(getActivity(), this, hour, minute, 
DateFormat.is24HourFormat(getActivity())); 
} 

public void onTimeSet(TimePicker view, int hourOfDay, int minute) { 
TextView textView = (TextView)getView().findViewById(R.id.timeOfWorkoutTextView); 

} 

public void showTimePickerDialog(View v) { 
    DialogFragment newFragment = new TimePickerFragment(); 
    newFragment.show(getFragmentManager(), "timePicker"); 
} 
} 

我非常新的Android开发人员和编程一般，所以一些非常详细的，愚蠢的，足以换一个孩子理解的答案将不胜感激!!!!

在此先感谢！

Answer 1

覆盖onActivityCreated()有初始化你的文字，如：

private TextView view; 

@Override 
public void onActivityCreated (Bundle savedInstanceState){ 
    view = (TextView) getView().findViewById(R.id.timeOfWorkoutTextView); 
} 

然后修改onTimeSet使用view，而不是调用getView()

public void onTimeSet(TimePicker view, int hourOfDay, int minute) { 
    TextView textView = (TextView)view.findViewById(R.id.timeOfWorkoutTextView); 
}