無法啓動組件信息的DatePicker

Question

我使用標籤以及使用單標籤多種活動。 我面臨的一個問題，即當我從父類到子類，類中有日期選擇器，然後單擊按鈕，顯示從那裏日期B中日對話。但是當我點擊該按鈕（觸發日期的對話），我的應用程序崩潰 當以下 「無法啓動組件信息」 需要幫助解決這個

這裏是子活動代碼

import java.util.Calendar; 
import android.app.Activity; 
import android.app.DatePickerDialog; 
import android.app.Dialog; 
import android.content.Intent; 
import android.os.Bundle; 
import android.view.View; 
import android.view.View.OnClickListener; 
import android.widget.Button; 
import android.widget.DatePicker; 
import android.widget.TextView; 
public class PlaceOrder extends Activity { 
    private TextView tvDisplayDate,personName,Cname,cAdrress; 
    private DatePicker dpResult; 
    private Button btnChangeDate; 
    Button cancel; 
    private int year; 
    private int month; 
    private int day; 
    static final int DATE_DIALOG_ID = 0; 

    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.placeorder); 
     personName=(TextView)findViewById(R.id.firstName); 
     Cname=(TextView)findViewById(R.id.Cname); 
     cAdrress=(TextView)findViewById(R.id.CAddname); 
     personName.setText(AccountInfo.fnameNlName); 
     Cname.setText(AccountInfo.cName); 
     cAdrress.setText(AccountInfo.cAdd); 
     setCurrentDateOnView(); 
     addListenerOnButton(); 
     cancel=(Button)findViewById(R.id.Cancel); 

     cancel.setOnClickListener(new OnClickListener() { 
      @Override 
      public void onClick(View v) { 
       if(FastPkgMainActivity.fastPackge==1) 
       { 
        Intent fastPkgQuote = new Intent(v.getContext(), FastPkgQuote.class); 
        StringBuffer urlString = new StringBuffer(); 
        FastPkgQuote parentActivity = (FastPkgQuote)getParent(); 
        parentActivity.replaceContentView("fastpkg1", fastPkgQuote); 
       } 
       else if(FastPkgMainActivity.fastPackge==2) 
       { 
        Intent fastpkgQuoteNew = new Intent(v.getContext(), FastPkgQuoteNew.class); 
        StringBuffer urlString = new StringBuffer(); 
        FastPkgQuoteNew parentActivity = (FastPkgQuoteNew)getParent(); 
        parentActivity.replaceContentView1("fastPkg2", fastpkgQuoteNew); 
       } 
      } 
     }); 
    } 

    public void setCurrentDateOnView() { 
     tvDisplayDate = (TextView) findViewById(R.id.tvDate); 
     dpResult = (DatePicker) findViewById(R.id.dpResult); 
     dpResult.setVisibility(View.INVISIBLE); 
     final Calendar c = Calendar.getInstance(); 
     year = c.get(Calendar.YEAR); 
     month = c.get(Calendar.MONTH); 
     day = c.get(Calendar.DAY_OF_MONTH); 
     tvDisplayDate.setText(new StringBuilder() 
      .append(month + 1).append("-").append(day).append("-").append(year).append(" ")); 
     dpResult.init(year, month, day, null); 
    } 

    public void addListenerOnButton() { 
     btnChangeDate = (Button) findViewById(R.id.btnChangeDate); 
     btnChangeDate.setOnClickListener(new View.OnClickListener() { 

      @Override 
      public void onClick(View v) { 
       showDialog(DATE_DIALOG_ID); 
      } 
     }); 
    } 

    @Override 
    public Dialog onCreateDialog(int id) { 
     switch (id) { 
      case DATE_DIALOG_ID: 
       return new DatePickerDialog(this, datePickerListener, year, month,day); 
     } 
     return null; 
    } 

    public DatePickerDialog.OnDateSetListener datePickerListener = new 
     DatePickerDialog.OnDateSetListener() { 
      public void onDateSet(DatePicker view, int selectedYear,int selectedMonth, int selectedDay) 
      { 
       year = selectedYear; 
       month = selectedMonth; 
       day = selectedDay; 
       tvDisplayDate.setText(new StringBuilder().append(month + 1).append("-").append(day).append("-").append(year).append(" ")); 
       // set selected date into datepicker also 
       dpResult.init(year, month, day, null); 
      } 
     }; 
    } 
} 

這裏是logcat的結果

FATAL EXCEPTION: main 

android.view.WindowManager$BadTokenException: 

Unable to add window -- token android.app.LocalActivityManager$LocalActivityRecord@44ef0838 

is not valid; is your activity running? 


android.view.ViewRoot.setView(ViewRoot.java:505) 

04-20 15:50:06.703: E/AndroidRuntime(323): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:177) 
04-20 15:50:06.703: E/AndroidRuntime(323): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:91) 
04-20 15:50:06.703: E/AndroidRuntime(323): at android.view.Window$LocalWindowManager.addView(Window.java:424) 
04-20 15:50:06.703: E/AndroidRuntime(323): at android.app.Dialog.show(Dialog.java:241) 
04-20 15:50:06.703: E/AndroidRuntime(323): at android.app.DatePickerDialog.show(DatePickerDialog.java:129) 
04-20 15:50:06.703: E/AndroidRuntime(323): at android.app.Activity.showDialog(Activity.java:2556) 
04-20 15:50:06.703: E/AndroidRuntime(323): at android.app.Activity.showDialog(Activity.java:2514) 
04-20 15:50:06.703: E/AndroidRuntime(323): at corrculator.fastPkg.PlaceOrder$3.onClick(PlaceOrder.java:108) 
04-20 15:50:06.703: E/AndroidRuntime(323): at android.view.View.performClick(View.java:2408) 
04-20 15:50:06.703: E/AndroidRuntime(323): at android.view.View$PerformClick.run(View.java:8816) 
04-20 15:50:06.703: E/AndroidRuntime(323): at android.os.Handler.handleCallback(Handler.java:587) 
04-20 15:50:06.703: E/AndroidRuntime(323): at android.os.Handler.dispatchMessage(Handler.java:92) 
04-20 15:50:06.703: E/AndroidRuntime(323): at android.os.Looper.loop(Looper.java:123) 
04-20 15:50:06.703: E/AndroidRuntime(323): at android.app.ActivityThread.main(ActivityThread.java:4627) 
04-20 15:50:06.703: E/AndroidRuntime(323): at java.lang.reflect.Method.invokeNative(Native Method) 
04-20 15:50:06.703: E/AndroidRuntime(323): at java.lang.reflect.Method.invoke(Method.java:521) 
04-20 15:50:06.703: E/AndroidRuntime(323): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868) 
04-20 15:50:06.703: E/AndroidRuntime(323): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626) 
04-20 15:50:06.703: E/AndroidRuntime(323): at dalvik.system.NativeStart.main(Native Method) 

Answer 1

我認爲這個問題可能是在這條線：

AlertDialog.Builder builder = new AlertDialog.Builder(this); 

嘗試將其改爲：

AlertDialog.Builder builder = new AlertDialog.Builder(MyActivityName.this);