（有临时演员）错误时服务的应用程序运行，并强制关闭

问题描述：

在我的应用程序，名为callService服务，从通话记录中取呼叫和保存数据库，并检索。代码完美工作。

服务在切换按钮变为活动状态时开始。它使用AlarmManager的setRepeating（）函数调用。重复时间设置为5000，为避免重复输入呼叫细节到数据库中，使用sharedpreference以毫秒为单位保存上次输入的时间。呼叫细节通过检查最后输入的呼叫时间进入DB。

callService.java如下所示。

callService.java：

import java.sql.Date; 

import java.text.SimpleDateFormat; 

import java.util.Calendar; 

import android.animation.TimeInterpolator; 

import android.app.Service; 

import android.content.Context; 

import android.content.Intent; 

import android.content.SharedPreferences; 

import android.database.Cursor; 

import android.os.IBinder; 

import android.provider.CallLog; 

import android.widget.Toast; 

public class callService extends Service 
{ 

DBManager db; 
Cursor managedCursor; 
String CallName,CallNumber,CallType,CallDate,CallTime,CallDuration,CallDATETIME, AmOrPm; 
long CallTimeMilli; 
Context context=this; 
long timeShared; 
SharedPreferences sh; 
@Override 
public IBinder onBind(Intent intent) { 
    // TODO Auto-generated method stub 
    return null; 
} 
@Override 
public void onCreate() { 
    // TODO Auto-generated method stub 
    super.onCreate(); 
    Toast.makeText(getApplicationContext(), "Call Service Created", Toast.LENGTH_SHORT).show(); 
    db=new DBManager(this); 
    sh=(SharedPreferences) this.getSharedPreferences("LastCallLogEntryTime",Context.MODE_PRIVATE); 

    //Toast.makeText(getApplicationContext(), ""+timeShared, 3000).show(); 
} 
@Override 
@Deprecated 
public void onStart(Intent intent, int startId) { 
    // TODO Auto-generated method stub 
    super.onStart(intent, startId); 
    //Toast.makeText(getApplicationContext(), "Service Started", Toast.LENGTH_SHORT).show(); 
    getCallDetails(); 

} 
@Override 
public void onDestroy() { 
    // TODO Auto-generated method stub 
    super.onDestroy(); 
    Toast.makeText(getApplicationContext(), "Call Service Stopped", Toast.LENGTH_SHORT).show(); 
} 

private void getCallDetails() 
{ 
    //StringBuffer buffer=new StringBuffer(); 


    managedCursor=context.getContentResolver().query(CallLog.Calls.CONTENT_URI, null, null, null, null); 

    int number=managedCursor.getColumnIndex(CallLog.Calls.NUMBER); 
    int type=managedCursor.getColumnIndex(CallLog.Calls.TYPE); 
    int date=managedCursor.getColumnIndex(CallLog.Calls.DATE); 
    int duration=managedCursor.getColumnIndex(CallLog.Calls.DURATION); 
    int name=managedCursor.getColumnIndex(CallLog.Calls.CACHED_NAME); 

    //buffer.append("Call Details: "); 
    //int a=managedCursor.getCount(); 
    //Toast.makeText(getApplicationContext(), "Inside GetCallDetails Function", Toast.LENGTH_SHORT).show(); 
    while(managedCursor.moveToNext()) 
    { 

     timeShared=sh.getLong("Time", 0); 
     String[] str={"0","0","0"}; 
     String[] a={"0","0","0"}; 
     String[] b={"0","0","0"}; 

     int dd=0, mm=0, yy=0, hh=0,mn=0,sec=0; 
     CallName = managedCursor.getString(name); 
     CallNumber = managedCursor.getString(number); 
     String cType = managedCursor.getString(type); 
     //String callDate = managedCursor.getString(date); 

     long CallTimeMilli= managedCursor.getLong(date); 
     //Toast.makeText(context, ""+seconds, 3000).show(); 
     SimpleDateFormat formatter = new SimpleDateFormat("dd-MM-yyyy HH:mm:ss a"); 
     CallDATETIME = formatter.format(new Date(CallTimeMilli)); 

     str=CallDATETIME.split(" "); 
     CallDate=str[0]; 
     CallTime=str[1]+" "+str[2]; 
     //AmOrPm=str[2]; 


     /*//a=CallDate.split("-"); 
     //Toast.makeText(getApplicationContext(), a[0]+" "+a[1]+" "+a[2], Toast.LENGTH_SHORT).show(); 
     dd=Integer.parseInt(a[0]); 
     mm=Integer.parseInt(a[1]); 
     yy=Integer.parseInt(a[2]); 

     //b=CallTime.split(":"); 
     //Toast.makeText(getApplicationContext(), b[0]+" "+b[1], Toast.LENGTH_SHORT).show(); 
     hh=Integer.parseInt(b[0]); 
     mn=Integer.parseInt(b[1]); 
     sec=Integer.parseInt(b[2]); 


     //Calendar calendar=Calendar.getInstance(); 
     //calendar.set(yy, mm, dd, hh, mn, 0); 
     calendar.set(calendar.YEAR, yy); 
     calendar.set(calendar.MONTH, mm); 
     calendar.set(calendar.DATE, dd); 
     calendar.set(calendar.HOUR, hh); 
     calendar.set(calendar.MINUTE, mn); 
     calendar.set(calendar.SECOND, sec);  
     calendar.set(Calendar.MILLISECOND, 0); 

     //Toast.makeText(getApplicationContext(), " "+calendar.getTimeInMillis(), Toast.LENGTH_SHORT).show(); 
     //CallTimeMilli=calendar.getTimeInMillis(); 
     //Toast.makeText(getApplicationContext(), " "+CallTimeMilli, Toast.LENGTH_SHORT).show(); 
     //Date callDayTime = new Date(Long.valueOf(callDate)); 
     */ 
     CallDuration = managedCursor.getString(duration); 

     CallType = null; 
     int dircode = Integer.parseInt(cType); 
     switch(dircode) 
     { 
     case CallLog.Calls.OUTGOING_TYPE: 
      CallType = "OUTGOING"; 
      break; 
     case CallLog.Calls.INCOMING_TYPE: 
      CallType = "INCOMING"; 
      break; 
     case CallLog.Calls.MISSED_TYPE: 
      CallType = "MISSED"; 
      break; 
     } 
     //buffer.append("\nPerson Name:-- "+CallName+"\nPhone Number:--- "+CallNumber +" \nCall Type:--- "+CallType+" \nCall Date:--- "+CallDate+" \nCall Time:--- "+CallTime+" \nCall duration in sec :--- "+CallDuration+" \nTime in Milli:--- "+CallTimeMilli); 
     //buffer.append("\n----------------------------------"); 
    if(timeShared==0) 
    { 
     db.addRowCall(CallName, CallNumber, CallType, CallDate, CallTime, CallDuration, CallTimeMilli); 
     //Toast.makeText(getApplicationContext(), "Call Added to DB from start", Toast.LENGTH_SHORT).show(); 
     sh.edit().putLong("Time", db.retrieveLastCallTime()).commit(); 
    } 
    else 
    { 
     //timeRetrieved=db.retrieveLastCallTime(); 
     if(CallTimeMilli>timeShared) 
     { 
      db.addRowCall(CallName, CallNumber, CallType, CallDate, CallTime, CallDuration, CallTimeMilli); 
      //Toast.makeText(getApplicationContext(), "......Added to DB secnd time.........", Toast.LENGTH_SHORT).show(); 
      sh.edit().putLong("Time", db.retrieveLastCallTime()).commit(); 

     } 
    } 
    } 

    managedCursor.close(); 
    //long t=db.retrieveLastCallTime(); 
    //Toast.makeText(getApplicationContext(), "LongValue "+t, Toast.LENGTH_SHORT).show(); 

} 

}

的服务是从settings.java调用，使用切换按钮

call_track.setOnClickListener(new OnClickListener() { 

      @Override 
      public void onClick(View v) { 
       // TODO Auto-generated method stub 
       if(call_track.isChecked()) 
       { 
        AlarmManager al=(AlarmManager)context_settins.getSystemService(context_settins.ALARM_SERVICE); 
        Intent istart = new Intent(context_settins, callService.class); 
        PendingIntent p=PendingIntent.getService(getApplicationContext(), 123456, istart, 0); 
        al.setRepeating(AlarmManager.RTC_WAKEUP,System.currentTimeMillis(),5000, p); 
        startService(new Intent(context_settins, callService.class)); 

       } 
       else 
       { 
        Intent intent=new Intent(context_settins, callService.class); 
        PendingIntent sender=PendingIntent.getService(context_settins, 123456, intent, 0); 
        AlarmManager alManager=(AlarmManager) context_settins.getSystemService(Context.ALARM_SERVICE); 
        alManager.cancel(sender); 
        stopService(new Intent(context_settins,callService.class)); 
       } 
      } 
     });

的问题是，当我启动该服务能正常工作，而数据进入到DB，Bt，每当有呼叫时，由于时间间隔是5000.

但是，一段时间后，应用程序强制关闭并在log cat中显示以下错误详细信息。

10-19 21:36:58.783: E/AndroidRuntime(298): java.lang.RuntimeException: Unable to startservice [email protected] with Intent { flg=0x4 cmp=MainPRJ.Diary/.callService (has extras) }: java.lang.NullPointerException 

10-19 21:36:58.783: E/AndroidRuntime(298): at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:3063) 

10-19 21:36:58.783: E/AndroidRuntime(298): at android.app.ActivityThread.access$3600(ActivityThread.java:125) 

10-19 21:36:58.783: E/AndroidRuntime(298): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2096) 

10-19 21:36:58.783: E/AndroidRuntime(298): at android.os.Handler.dispatchMessage(Handler.java:99) 
10-19 21:36:58.783: E/AndroidRuntime(298): at android.os.Looper.loop(Looper.java:123) 

10-19 21:36:58.783: E/AndroidRuntime(298): at android.app.ActivityThread.main(ActivityThread.java:4627) 

10-19 21:36:58.783: E/AndroidRuntime(298): at java.lang.reflect.Method.invokeNative(Native Method) 

10-19 21:36:58.783: E/AndroidRuntime(298): at java.lang.reflect.Method.invoke(Method.java:521) 

10-19 21:36:58.783: E/AndroidRuntime(298): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868) 

10-19 21:36:58.783: E/AndroidRuntime(298): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626) 

10-19 21:36:58.783: E/AndroidRuntime(298): at dalvik.system.NativeStart.main(Native Method) 

10-19 21:36:58.783: E/AndroidRuntime(298): Caused by: java.lang.NullPointerException 

10-19 21:36:58.783: E/AndroidRuntime(298): at MainPRJ.Diary.callService.getCallDetails(callService.java:64) 

10-19 21:36:58.783: E/AndroidRuntime(298): at MainPRJ.Diary.callService.onStart(callService.java:47) 

10-19 21:36:58.783: E/AndroidRuntime(298): at android.app.Service.onStartCommand(Service.java:420) 

10-19 21:36:58.783: E/AndroidRuntime(298): at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:3053) 

10-19 21:36:58.783: E/AndroidRuntime(298): ... 10 more

我寻觅了很多，但没有得到任何解决方案... 我是新来的Android和无法理解whtas在这里发生...... 在此先感谢...

这哪里是'callService.java：64'？ –

您在callService.java上有一个NPE，行64 – Fustigador

yaa ..行号64是getCallDetails（）中的第二行代码... \t \t int number = managedCursor.getColumnIndex（CallLog.Calls.NUMBER）; – nafi

答

可能context为null，因为你正在努力创建服务之前初始化它：

@Override 
public void onCreate() { 
    // TODO Auto-generated method stub 
    super.onCreate(); 
    context=callService.this; 
    ..... 
}

要正确初始化上下文，做上下文context = getApplicationContext（） – Fustigador

好的..我会尝试这... – nafi

我认为它的工作原理...错误没有显示到现在...谢谢... – nafi

（有临时演员）错误时服务的应用程序运行，并强制关闭

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