android - 启动后，崩溃

Question

我的应用程序正在使用启动服务。在该服务中，我必须从数据库中获取值，但应用程序在尝试获取值时崩溃了...

logcat 错误如下所示......

01-03 22:19:46.097: E/AndroidRuntime(240): FATAL EXCEPTION: main 01-03 22:19:46.097: E/AndroidRuntime(240): java.lang.RuntimeException: Unable to create service com.android.antitheft.MyService: java.lang.IllegalStateException: get field slot from row 0 col -1 failed 01-03 22:19:46.097: E/AndroidRuntime(240): at android.app.ActivityThread.handleCreateService(ActivityThread.java:2969) 01-03 22:19:46.097: E/AndroidRuntime(240): at android.app.ActivityThread.access$3300(ActivityThread.java:125) 01-03 22:19:46.097: E/AndroidRuntime(240): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2087) 01-03 22:19:46.097: E/AndroidRuntime(240): at android.os.Handler.dispatchMessage(Handler.java:99) 01-03 22:19:46.097: E/AndroidRuntime(240): at android.os.Looper.loop(Looper.java:123) 01-03 22:19:46.097: E/AndroidRuntime(240): at android.app.ActivityThread.main(ActivityThread.java:4627) 01-03 22:19:46.097: E/AndroidRuntime(240): at java.lang.reflect.Method.invokeNative(Native Method) 01-03 22:19:46.097: E/AndroidRuntime(240): at java.lang.reflect.Method.invoke(Method.java:521) 01-03 22:19:46.097: E/AndroidRuntime(240): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868) 01-03 22:19:46.097: E/AndroidRuntime(240): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626) 01-03 22:19:46.097: E/AndroidRuntime(240): at dalvik.system.NativeStart.main(Native Method) 01-03 22:19:46.097: E/AndroidRuntime(240): Caused by: java.lang.IllegalStateException: get field slot from row 0 col -1 failed 01-03 22:19:46.097: E/AndroidRuntime(240): at android.database.CursorWindow.getString_native(Native Method) 01-03 22:19:46.097: E/AndroidRuntime(240): at android.database.CursorWindow.getString(CursorWindow.java:329) 01-03 22:19:46.097: E/AndroidRuntime(240): at android.database.AbstractWindowedCursor.getString(AbstractWindowedCursor.java:49) 01-03 22:19:46.097: E/AndroidRuntime(240): at com.android.antitheft.MyService.onCreate(MyService.java:69) 01-03 22:19:46.097: E/AndroidRuntime(240): at android.app.ActivityThread.handleCreateService(ActivityThread.java:2959) 01-03 22:19:46.097: E/AndroidRuntime(240): ... 10 more

提前致谢......

我的service.java//文件

package com.android.antitheft;

import android.app.Service;
import android.content.Context;
import android.content.Intent;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.os.IBinder;
import android.telephony.TelephonyManager;
import android.telephony.SmsManager;
import android.util.Log;
import android.widget.Toast;

public class MyService extends Service {

SQLiteDatabase myDB;

@Override
public IBinder onBind(Intent arg0) {
    // TODO Auto-generated method stub
    return null;
}
@Override
public void onCreate() {
    super.onCreate();
    System.out.println("@@@@@@@@@@@OnCreate1111");
    Toast.makeText(this, "Service Created", Toast.LENGTH_LONG).show();


      myDB = MyService.this.openOrCreateDatabase("antitheft", MODE_PRIVATE, null);
        Cursor cursor1 = myDB.query("SimSerial", null, null, null, null, null, null);
     cursor1.moveToLast();
        //cursor1.moveToFirst();
        String ss1 = cursor1.getString(cursor1.getColumnIndex("simno"));
        Toast.makeText(this, "FROM DATABASE: SIM SERIAL "+ss1, Toast.LENGTH_LONG).show();
        cursor1.close();
        myDB.close();



//          cursor2.moveToNext();
//          String num2 = cursor2.getString(cursor2.getColumnIndex("secure"));
//          
//          cursor2.moveToNext();
//          String num3 = cursor2.getString(cursor2.getColumnIndex("secure"));  

        TelephonyManager tm = (TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE);
        String ss=tm.getSimSerialNumber();

        Log.v("SERVICE", ss);

        Toast.makeText(this, "Service started : SIM SERIAL "+ss, Toast.LENGTH_LONG).show();

        Log.v("StartServiceAtBoot", "StartAtBootService -- onStartCommand()");          



        if(ss.equals(ss1))
        {
            SmsManager sms = SmsManager.getDefault();

//              sms.sendTextMessage("5556", null, "message", null, null);

            Toast.makeText(this, "INSIDE iffffffffffff ", Toast.LENGTH_LONG).show();
             myDB = MyService.this.openOrCreateDatabase("antitheft", MODE_PRIVATE, null);
            Cursor cursor2 = myDB.query("SimSerial", null, null, null, null, null, null);

            cursor2.moveToFirst();
            while (cursor2.isAfterLast() == false) {
                String num1 = cursor2.getString(cursor2.getColumnIndex("secure"));
                sms.sendTextMessage(num1, null, "message", null, null);
                cursor2.moveToNext();
            }
            cursor2.close();

            myDB.close();

//              sms.sendTextMessage(num1, null, "message", null, null);  
//              sms.sendTextMessage(num2, null, "message", null, null);
//              sms.sendTextMessage(num3, null, "message", null, null);
            }

//          else
//              
//          {
//              SmsManager sms = SmsManager.getDefault();
//              sms.sendTextMessage("5556", null, "message", null, null);
//              
//              Toast.makeText(this, "INSIDE elseeeeeeeeeeeeee", Toast.LENGTH_LONG).show();
//          }


}

@Override
public void onDestroy() {
    super.onDestroy();

    Toast.makeText(this, "Service Destroyed", Toast.LENGTH_LONG).show();

}

 @Override
    public int onStartCommand(Intent intent, int flags, int startId) 
    {



        // We want this service to continue running until it is explicitly
        // stopped, so return sticky.
        return START_STICKY;
    }

Answer 1

当您从数据库创建游标时，您必须首先检查 (cursor != null && cursor.moveToFirst())。在您的情况下，如果没有任何可用数据，则会产生问题。

所以在你使用 Cursor 之前添加条件

if(c != null && c.moveToFirst()) {
//write your code here
} 

java.lang.IllegalStateException: get field slot from row 0 col -1 failed

如果您尝试从游标读取列值但该列不存在于游标中，通常会出现此错误。