基本上,当我单击小部件上的特定按钮时,我想要获取数据库中的下一条记录。该功能本身正常工作,因为我在应用程序中使用它。但在小部件中,它正在崩溃。我认为这是onreceive函数本身就是问题,但即使我只是设置onReceive来更新它崩溃的文本视图为nullpointerexception。Android小部件onReceive崩溃
public static String NEXT_RECORD =“next_record”;
这里是它被称为:
意图意图=新意图(上下文,MyWidgetProvider.class);
intent.setAction(NEXT_RECORD); PendingIntent pendingIntent = PendingIntent.getBroadcast(context, 0,intent,PendingIntent.FLAG_UPDATE_CURRENT); remoteViews.setOnClickPendingIntent(R.id.TextView02,pendingIntent);
和的onReceive
@Override
public void onReceive(Context context, Intent intent) {
super.onReceive(context, intent);
if(NEXT_RECORD.equals(intent.getAction())){
newid = mDbHelper.getNextRecord(1, keyid);
}
}
04-12 14:47:57.591: E/AndroidRuntime(30633): FATAL EXCEPTION: main
04-12 14:47:57.591: E/AndroidRuntime(30633): java.lang.RuntimeException: Unable to start receiver com.example.app.hs.MyWidgetProvider: java.lang.NullPointerException
04-12 14:47:57.591: E/AndroidRuntime(30633): at android.app.ActivityThread.handleReceiver(ActivityThread.java:2362)
04-12 14:47:57.591: E/AndroidRuntime(30633): at android.app.ActivityThread.access$1500(ActivityThread.java:142)
04-12 14:47:57.591: E/AndroidRuntime(30633): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1284)
04-12 14:47:57.591: E/AndroidRuntime(30633): at android.os.Handler.dispatchMessage(Handler.java:99)
04-12 14:47:57.591: E/AndroidRuntime(30633): at android.os.Looper.loop(Looper.java:137)
04-12 14:47:57.591: E/AndroidRuntime(30633): at android.app.ActivityThread.main(ActivityThread.java:4931)
04-12 14:47:57.591: E/AndroidRuntime(30633): at java.lang.reflect.Method.invokeNative(Native Method)
04-12 14:47:57.591: E/AndroidRuntime(30633): at java.lang.reflect.Method.invoke(Method.java:511)
04-12 14:47:57.591: E/AndroidRuntime(30633): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:791)
04-12 14:47:57.591: E/AndroidRuntime(30633): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:558)
04-12 14:47:57.591: E/AndroidRuntime(30633): at dalvik.system.NativeStart.main(Native Method)
04-12 14:47:57.591: E/AndroidRuntime(30633): Caused by: java.lang.NullPointerException
04-12 14:47:57.591: E/AndroidRuntime(30633): at com.example.app.hs.MyWidgetProvider.onReceive(MyWidgetProvider.java:100)
添加Logcat堆栈跟踪。 – tolgap
我已经添加了。第100行是getNextRecord,但正如我所说的,我可以在其中添加任何内容,并且会崩溃。 – Paul
你可以显示你的mDbHelper实例的创建位置吗? –