问题描述
这是我现在正在使用我的Android应用程序处理的问题.程序可以在模拟器上正常运行，没有任何错误，但是在运行相同操作系统的真实设备上却可以出错.
Here is the problem that I am dealing with right now with my Android App. Program works fine on emulator without any error but errors out on real device running same OS.
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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.在模拟器上可以正常工作.
I have a App Widget Update Service that updates my Widget. This service checks whether the widget is on the screen otherwise does not go through the update process. Works fine on emulator.
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，该变量会告诉我其ENABLED，DELETED或UPDATE意图.
Every time the widget has to be updated in the OnReceive method I capture the intent in a string variable check_intent which tells me if its ENABLED, DELETED or UPDATE intents.
我有一个仅启用了一个字段的SQLite表tuuserid_widget_enabled.启用意图后，将其切换为1，将其删除时，将其切换为0.
I have a SQLite table tuuserid_widget_enabled which has only one field enabled. When the intent is enabled I toggle it to 1 and when deleted I toggle it to 0. Works fine.
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，但是在模拟器上一切正常.
When the intent is UPDATE I check if the enable field in the DB table is = 1 if true then I go ahead with the update. This is where I get the Cursor Index Out of Bounds error on the device but everything works as expected on the emulator.
在此方面的任何帮助，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.
I would appreciate any help on this. Thanks in advance. Sorry if I did something wrong, I am just learning Android.
这是错误-
02-02 18:58:03.007: ERROR/AndroidRuntime(4292): FATAL EXCEPTION: main
02-02 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 0
02-02 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.access$3600(ActivityThread.java:135)
02-02 18:58:03.007: ERROR/AndroidRuntime(4292): at android.app.ActivityThread$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$MethodAndArgsCaller.run(ZygoteInit.java:868)
02-02 18:58:03.007: ERROR/AndroidRuntime(4292): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
02-02 18:58:03.007: ERROR/AndroidRuntime(4292): at dalvik.system.NativeStart.main(Native Method)
02-02 18:58:03.007: ERROR/AndroidRuntime(4292): Caused by: android.database.CursorIndexOutOfBoundsException: Index 0 requested, with a size of 0
02-02 18:58:03.007: ERROR/AndroidRuntime(4292): at android.database.AbstractCursor.checkPosition(AbstractCursor.java:580)
02-02 18:58:03.007: ERROR/AndroidRuntime(4292): at android.database.AbstractWindowedCursor.checkPosition(AbstractWindowedCursor.java:214)
02-02 18:58:03.007: ERROR/AndroidRuntime(4292): at android.database.AbstractWindowedCursor.getInt(AbstractWindowedCursor.java:84)
02-02 18:58:03.007: ERROR/AndroidRuntime(4292): at Test.TU.TUWidget$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
这是代码段.
@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();
}
}
}
推荐答案
您的游标/数据库可能为空-没有行.试试:
Your cursor/database is probably empty - no rows. Try:
if (cur.moveToFirst()) { // returns false if cursor is empty
widget_enabled = cur.getInt(0);
} else {
widget_enabled = 0;
}
这篇关于不在模拟器上的Android设备上的IndexOutOfBoundsException错误的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！