使用時間選擇器的自定義對話框

Question

我正在從主要活動開始一項新活動。當單擊主活動上的單選按鈕時，我需要顯示時間選取器對話框。當我點擊單選按鈕時出現錯誤，該對話框將顯示給我。

CODE

import java.util.Calendar; 
import android.app.Dialog; 
import android.support.v4.app.DialogFragment; 
import android.app.TimePickerDialog; 
import android.os.Bundle; 
import android.text.format.DateFormat; 
import android.widget.TimePicker; 

public class Tilldate 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) { 
     // Do something with the time chosen by the user 
    } 

} 

logcat的

10-16 13:01:37.539: E/AndroidRuntime(1435): FATAL EXCEPTION: main 
10-16 13:01:37.539: E/AndroidRuntime(1435): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.example.avst.callxpressmobile/com.example.avst.callxpressmobile.Tilldate}: java.lang.ClassCastException: com.example.avst.callxpressmobile.Tilldate cannot be cast to android.app.Activity 
10-16 13:01:37.539: E/AndroidRuntime(1435):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1983) 
10-16 13:01:37.539: E/AndroidRuntime(1435):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084) 
10-16 13:01:37.539: E/AndroidRuntime(1435):  at android.app.ActivityThread.access$600(ActivityThread.java:130) 
10-16 13:01:37.539: E/AndroidRuntime(1435):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195) 
10-16 13:01:37.539: E/AndroidRuntime(1435):  at android.os.Handler.dispatchMessage(Handler.java:99) 
10-16 13:01:37.539: E/AndroidRuntime(1435):  at android.os.Looper.loop(Looper.java:137) 
10-16 13:01:37.539: E/AndroidRuntime(1435):  at android.app.ActivityThread.main(ActivityThread.java:4745) 
10-16 13:01:37.539: E/AndroidRuntime(1435):  at java.lang.reflect.Method.invokeNative(Native Method) 
10-16 13:01:37.539: E/AndroidRuntime(1435):  at java.lang.reflect.Method.invoke(Method.java:511) 
10-16 13:01:37.539: E/AndroidRuntime(1435):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786) 
10-16 13:01:37.539: E/AndroidRuntime(1435):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) 
10-16 13:01:37.539: E/AndroidRuntime(1435):  at dalvik.system.NativeStart.main(Native Method) 
10-16 13:01:37.539: E/AndroidRuntime(1435): Caused by: java.lang.ClassCastException: com.example.avst.callxpressmobile.Tilldate cannot be cast to android.app.Activity 
10-16 13:01:37.539: E/AndroidRuntime(1435):  at android.app.Instrumentation.newActivity(Instrumentation.java:1053) 
10-16 13:01:37.539: E/AndroidRuntime(1435):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1974) 
10-16 13:01:37.539: E/AndroidRuntime(1435):  ... 11 more 

對於我的主要活動，請看看

Number of Custom Dialogs (Date and Time Picker) with relation to Radio Buttons

Answer 1

由於它不是一項活動從AndroidManifest刪除Tilldate。 xml，然後假設你正在調用startActivity ， 使用

DialogFragment dialog = new Tilldate(); 

對話框.show（getFragmentManager（）， 「對話」）;

dialog .show(getFragmentManager().beginTransaction(), "dialog"); 

代替startActivity

的

如果你需要一個自定義對話框，延長TimePickerDialog。