Java-Android装置上的模拟器不在IndexOutOfBoundsException错误

概述这是我现在正在使用我的Android应用程序处理的问题.程序在模拟器上运行良好,没有任何错误,但在运行相同 *** 作系统的真实设备上却出现了错误.>我有一个应用程序小部件更新服务,用于更新我的小部件.此服务检查窗口小部件是否在屏幕上,否则不进行更新过程.在模拟器上工作正常.>每次必

这是我现在正在使用我的Android应用程序处理的问题.程序在模拟器上运行良好,没有任何错误,但在运行相同 *** 作系统的真实设备上却出现了错误.

>我有一个应用程序小部件更新服务,用于更新我的小部件.此服务检查窗口小部件是否在屏幕上,否则不进行更新过程.在模拟器上工作正常.
>每次必须在OnReceive方法中更新窗口小部件时,我都会在字符串变量check_intent中捕获该意图,该变量告诉我其ENABLED,DELETED或UPDATE意图.
>我有一个sqlite表tuuserID_Widget_enabled,其中仅启用了一个字段.启用意图后,将其切换为1,将其删除时将其切换为0.工作正常.
>当意图为UPDATE时,我检查DB表中的enable字段是否为1(如果为true),然后继续进行更新.这是我在设备上收到“游标索引超出范围”错误的地方,但是一切都在模拟器上按预期工作.

我将不胜感激.提前致谢.抱歉,如果我做错了什么,我正在学习AndroID.

这是错误-

    02-02 18:58:03.007: ERROR/AndroIDRuntime(4292): FATAL EXCEPTION: main02-02 18:58:03.007: ERROR/AndroIDRuntime(4292): java.lang.RuntimeException: Unable to start service Test.TU.TUWidget$UpdateService@45d2b7d0 with Intent { cmp=Test.TU/.TUWidget$UpdateService }: androID.database.Cursorindexoutofboundsexception: Index 0 requested, with a size of 002-02 18:58:03.007: ERROR/AndroIDRuntime(4292):     at androID.app.ActivityThread.handleServiceArgs(ActivityThread.java:3282)02-02 18:58:03.007: ERROR/AndroIDRuntime(4292):     at androID.app.ActivityThread.access00(ActivityThread.java:135)02-02 18:58:03.007: ERROR/AndroIDRuntime(4292):     at androID.app.ActivityThread$H.handleMessage(ActivityThread.java:2211)02-02 18:58:03.007: ERROR/AndroIDRuntime(4292):     at androID.os.Handler.dispatchMessage(Handler.java:99)02-02 18:58:03.007: ERROR/AndroIDRuntime(4292):     at androID.os.Looper.loop(Looper.java:144)02-02 18:58:03.007: ERROR/AndroIDRuntime(4292):     at androID.app.ActivityThread.main(ActivityThread.java:4937)02-02 18:58:03.007: ERROR/AndroIDRuntime(4292):     at java.lang.reflect.Method.invokeNative(Native Method)02-02 18:58:03.007: ERROR/AndroIDRuntime(4292):     at java.lang.reflect.Method.invoke(Method.java:521)02-02 18:58:03.007: ERROR/AndroIDRuntime(4292):     at com.androID.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)02-02 18:58:03.007: ERROR/AndroIDRuntime(4292):     at com.androID.internal.os.ZygoteInit.main(ZygoteInit.java:626)02-02 18:58:03.007: ERROR/AndroIDRuntime(4292):     at dalvik.system.NativeStart.main(Native Method)02-02 18:58:03.007: ERROR/AndroIDRuntime(4292): Caused by: androID.database.Cursorindexoutofboundsexception: Index 0 requested, with a size of 002-02 18:58:03.007: ERROR/AndroIDRuntime(4292):     at androID.database.AbstractCursor.checkposition(AbstractCursor.java:580)02-02 18:58:03.007: ERROR/AndroIDRuntime(4292):     at androID.database.AbstractwindowedCursor.checkposition(AbstractwindowedCursor.java:214)02-02 18:58:03.007: ERROR/AndroIDRuntime(4292):     at androID.database.AbstractwindowedCursor.getInt(AbstractwindowedCursor.java:84)02-02 18:58:03.007: ERROR/AndroIDRuntime(4292):     at Test.TU.TUWidget$UpdateService.onStart(TUWidget.java:209)02-02 18:58:03.007: ERROR/AndroIDRuntime(4292):     at androID.app.Service.onStartCommand(Service.java:420)02-02 18:58:03.007: ERROR/AndroIDRuntime(4292):     at androID.app.ActivityThread.handleServiceArgs(ActivityThread.java:3267)02-02 18:58:03.007: ERROR/AndroIDRuntime(4292):     ... 10 more

以下是代码片段.

@OverrIDe    public voID onReceive(Context context, Intent intent) {        check_intent = intent.getAction();        WidgetUpdate.setAction(AppWidgetManager.ACTION_APPWidget_UPDATE);        AlarmManager alarms = (AlarmManager)context.getSystemService(Context.ALARM_SERVICE);        PendingIntent newPending = PendingIntent.getbroadcast(context, 0, WidgetUpdate,PendingIntent.FLAG_UPDATE_CURRENT);        alarms.set(AlarmManager.ELAPSED_REALTIME, SystemClock.elapsedRealtime()+ PERIOD, newPending);        context.startService(new Intent(context, UpdateService.class));} public static class UpdateService extends Service {        @OverrIDe        public voID onStart(Intent intent, int startID) {        if (check_intent.contains("APPWidget_ENABLED")){            TUDB tdb = new TUDB(getApplicationContext());            final sqliteDatabase db = tdb.getReadableDatabase();            String update_sql = "update tuuserID_Widget_enabled set enabled = '1';";            if(db.isopen() && !db.isReadonly()){                db.execsql(update_sql);                db.close();            }        }        else        **if (check_intent.contains("APPWidget_UPDATE")){            TUDB tdb1 = new TUDB(getBaseContext());            final sqliteDatabase db1 = tdb1.getReadableDatabase();            String check_Widget_enabled = "select enabled from tuuserID_Widget_enabled;";            if(db1.isopen() && !db1.isReadonly()){                Cursor cur = db1.rawquery(check_Widget_enabled, null);                 cur.movetoFirst();                Widget_enabled = cur.getInt(0); //this is where it bombs                cur.close();                db1.close();            }**            if (Widget_enabled == 1){                RemoteVIEws updateVIEws = buildUpdate(getApplicationContext());                          Componentname thisWidget = new Componentname(getApplicationContext(), TUWidget.class);                AppWidgetManager manager = AppWidgetManager.getInstance(getApplicationContext());                manager.updateAppWidget(thisWidget, updateVIEws);               }        }        else        if (check_intent.contains("APPWidget_DELETED")){            TUDB tdb = new TUDB(getBaseContext());            final sqliteDatabase db = tdb.getReadableDatabase();            String update_sql = "update tuuserID_Widget_enabled set enabled = '0';";            if(db.isopen() && !db.isReadonly()){                db.execsql(update_sql);                db.close();            }        }    }

解决方法:

您的游标/数据库可能为空-没有行.尝试：

if (cur.movetoFirst()) { // returns false if cursor is empty    Widget_enabled = cur.getInt(0);} else {    Widget_enabled = 0;}

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