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我正在做一个呼叫跟踪应用程序...

在我的应用程序中，有一个名为 callService 的服务，它从通话记录中获取通话并保存到数据库，然后进行检索。该代码完美运行。

该服务在切换按钮变为活动状态时启动。它是使用 AlarmManager 的 setRepeating() 函数调用的。重复时间设置为 5000，并且为了避免条目调用详细信息重复到 DB 中，使用 sharedpreference 以毫秒为单位保存上次输入的时间。通过检查最后输入的通话时间，通话详细信息进入数据库。

callService.java 如下所示。

调用服务.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();

}

}

使用切换按钮从 settings.java 调用该服务

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));
                }
            }
        });

问题是，当我启动服务时，它工作正常，并且数据输入到 DB，Bt，每当呼叫到来，因为时间间隔是 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 MainPRJ.Diary.callService@43e66740 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

我进行了很多搜索，但没有得到任何解决方案...我是 android 新手，无法理解这里发生的事情...提前致谢...

4

1 回答 1

0

可能context是 null 因为您试图在创建服务之前对其进行初始化：

@Override
public void onCreate() {
    // TODO Auto-generated method stub
    super.onCreate();
    context=callService.this;
    .....
}
于 2013-10-19T16:51:28.277 回答