Android 대화 상자 오류

Question

DatePicker 및 TimePicker를 만들었습니다. 그들과 함께 대화가 나타나야 할 시간을 정할 수 있습니다. 버튼을 눌러 알람을 설정해도 문제가 없지만 대화 상자가 나타나야 할 때 "불행하게도 프로그램이 중지되었습니다."대화 상자에 텍스트가 표시됩니다. 누군가 내 코드에서 어디에 문제가 있는지를 보여줄 수 있습니까?

MainActivity :

package in.wptrafficanalyzer.servicealarmdemo; 

    import java.util.GregorianCalendar; 

    import android.app.Activity; 
    import android.app.AlarmManager; 
    import android.app.PendingIntent; 
    import android.content.Intent; 
    import android.os.Bundle; 
    import android.view.Menu; 
    import android.view.View; 
    import android.view.View.OnClickListener; 
    import android.widget.Button; 
    import android.widget.DatePicker; 
    import android.widget.TimePicker; 
    import android.widget.Toast; 


    public class MainActivity extends Activity { 

     @Override 
     public void onCreate(Bundle savedInstanceState) { 
      super.onCreate(savedInstanceState); 
      setContentView(R.layout.activity_main); 

      OnClickListener setClickListener = new OnClickListener() { 

       @Override 
       public void onClick(View v) { 
        /** This intent invokes the activity DemoActivity, which in turn opens the AlertDialog window */ 
        Intent i = new Intent("in.wptrafficanalyzer.servicealarmdemo.demoactivity"); 

        /** Creating a Pending Intent */ 
        PendingIntent operation = PendingIntent.getActivity(getBaseContext(), 0, i, Intent.FLAG_ACTIVITY_NEW_TASK); 

        /** Getting a reference to the System Service ALARM_SERVICE */ 
        AlarmManager alarmManager = (AlarmManager) getBaseContext().getSystemService(ALARM_SERVICE); 

        /** Getting a reference to DatePicker object available in the MainActivity */ 
        DatePicker dpDate = (DatePicker) findViewById(R.id.dp_date); 

        /** Getting a reference to TimePicker object available in the MainActivity */ 
        TimePicker tpTime = (TimePicker) findViewById(R.id.tp_time); 

        int year = dpDate.getYear(); 
        int month = dpDate.getMonth(); 
        int day = dpDate.getDayOfMonth(); 
        int hour = tpTime.getCurrentHour(); 
        int minute = tpTime.getCurrentMinute(); 

        /** Creating a calendar object corresponding to the date and time set by the user */ 
        GregorianCalendar calendar = new GregorianCalendar(year,month,day, hour, minute); 

        /** Converting the date and time in to milliseconds elapsed since epoch */ 
        long alarm_time = calendar.getTimeInMillis(); 

        /** Setting an alarm, which invokes the operation at alart_time */ 
        alarmManager.set(AlarmManager.RTC_WAKEUP , alarm_time , operation); 

        /** Alert is set successfully */ 
        Toast.makeText(getBaseContext(), "Alarm is set successfully",Toast.LENGTH_SHORT).show(); 

       } 
      };  

      OnClickListener quitClickListener = new OnClickListener() {   
       @Override 
       public void onClick(View v) { 
        finish(); 
       } 
      }; 

      Button btnSetAlarm = (Button) findViewById(R.id.btn_set_alarm); 
      btnSetAlarm.setOnClickListener(setClickListener); 

      Button btnQuitAlarm = (Button) findViewById(R.id.btn_quit_alarm); 
      btnQuitAlarm.setOnClickListener(quitClickListener); 

     } 

     @Override 
     public boolean onCreateOptionsMenu(Menu menu) { 
      getMenuInflater().inflate(R.menu.activity_main, menu); 
      return true; 
     } 
    } 

AlertDemo :

package in.wptrafficanalyzer.servicealarmdemo; 

import android.app.AlertDialog; 
import android.app.Dialog; 
import android.content.DialogInterface; 
import android.content.DialogInterface.OnClickListener; 
import android.os.Bundle; 
import android.support.v4.app.DialogFragment; 
import android.view.WindowManager.LayoutParams; 


public class AlertDemo extends DialogFragment { 

    @Override 
    public Dialog onCreateDialog(Bundle savedInstanceState) { 

     /** Turn Screen On and Unlock the keypad when this alert dialog is displayed */ 
     getActivity().getWindow().addFlags(LayoutParams.FLAG_TURN_SCREEN_ON | LayoutParams.FLAG_DISMISS_KEYGUARD); 


     /** Creating a alert dialog builder */ 
     AlertDialog.Builder builder = new AlertDialog.Builder(getActivity()); 

     /** Setting title for the alert dialog */ 
     builder.setTitle("Alarm"); 

     /** Setting the content for the alert dialog */ 
     builder.setMessage("An Alarm by AlarmManager"); 

     /** Defining an OK button event listener */ 
     builder.setPositiveButton("OK", new OnClickListener() { 
      @Override 
      public void onClick(DialogInterface dialog, int which) { 
       /** Exit application on click OK */ 
       getActivity().finish(); 
      }      
     }); 

     /** Creating the alert dialog window */ 
     return builder.create(); 
    } 

    /** The application should be exit, if the user presses the back button */ 
    @Override 
    public void onDestroy() {  
     super.onDestroy(); 
     getActivity().finish(); 
    } 

} 

DemoActivity :

package in.wptrafficanalyzer.servicealarmdemo; 

import android.os.Bundle; 
import android.support.v4.app.FragmentActivity; 
import android.view.WindowManager.LayoutParams; 
import android.widget.Toast; 

public class DemoActivity extends FragmentActivity { 
    @Override 
    protected void onCreate(Bundle savedInstanceState) {   
     super.onCreate(savedInstanceState); 

     /** Creating an Alert Dialog Window */ 
     AlertDemo alert = new AlertDemo(); 

     /** Opening the Alert Dialog Window */ 
     alert.show(getSupportFragmentManager(), "AlertDemo");  
    } 
} 

로그 캣 :

07-18 15:01:40.740: E/AndroidRuntime(429): FATAL EXCEPTION: main 
07-18 15:01:40.740: E/AndroidRuntime(429): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{in.wptrafficanalyzer.servicealarmdemo/in.wptrafficanalyzer.servicealarmdemo.DemoActivity}: java.lang.ClassNotFoundException: in.wptrafficanalyzer.servicealarmdemo.DemoActivity in loader dalvik.system.PathClassLoader[/data/app/in.wptrafficanalyzer.servicealarmdemo-1.apk] 
07-18 15:01:40.740: E/AndroidRuntime(429): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2585) 
07-18 15:01:40.740: E/AndroidRuntime(429): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679) 
07-18 15:01:40.740: E/AndroidRuntime(429): at android.app.ActivityThread.access$2300(ActivityThread.java:125) 
07-18 15:01:40.740: E/AndroidRuntime(429): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033) 
07-18 15:01:40.740: E/AndroidRuntime(429): at android.os.Handler.dispatchMessage(Handler.java:99) 
07-18 15:01:40.740: E/AndroidRuntime(429): at android.os.Looper.loop(Looper.java:123) 
07-18 15:01:40.740: E/AndroidRuntime(429): at android.app.ActivityThread.main(ActivityThread.java:4627) 
07-18 15:01:40.740: E/AndroidRuntime(429): at java.lang.reflect.Method.invokeNative(Native Method) 
07-18 15:01:40.740: E/AndroidRuntime(429): at java.lang.reflect.Method.invoke(Method.java:521) 
07-18 15:01:40.740: E/AndroidRuntime(429): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868) 
07-18 15:01:40.740: E/AndroidRuntime(429): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626) 
07-18 15:01:40.740: E/AndroidRuntime(429): at dalvik.system.NativeStart.main(Native Method) 
07-18 15:01:40.740: E/AndroidRuntime(429): Caused by: java.lang.ClassNotFoundException: in.wptrafficanalyzer.servicealarmdemo.DemoActivity in loader dalvik.system.PathClassLoader[/data/app/in.wptrafficanalyzer.servicealarmdemo-1.apk] 
07-18 15:01:40.740: E/AndroidRuntime(429): at dalvik.system.PathClassLoader.findClass(PathClassLoader.java:243) 
07-18 15:01:40.740: E/AndroidRuntime(429): at java.lang.ClassLoader.loadClass(ClassLoader.java:573) 
07-18 15:01:40.740: E/AndroidRuntime(429): at java.lang.ClassLoader.loadClass(ClassLoader.java:532) 
07-18 15:01:40.740: E/AndroidRuntime(429): at android.app.Instrumentation.newActivity(Instrumentation.java:1021) 
07-18 15:01:40.740: E/AndroidRuntime(429): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2577) 

Answer 1

클래스 로더가 찾을 수없는 DemoActivity을 찾고 있습니다. 프로젝트에서 DemoActivity 클래스를 사용할 수 있는지 확인하십시오.

Intent i = new Intent("in.wptrafficanalyzer.servicealarmdemo.demoactivity"); 

사용한다 : 대신 또한

// 유래 :

Intent i = new Intent(getBaseContext(),DemoActivity.class);