我正在使用 Home 小部件做一个应用程序。
主页小部件第一次工作正常，而删除主页小部件正常并再次添加主页小部件强制关闭。
我的代码：
@Override
public void onUpdate(Context context, AppWidgetManager appWidgetManager1,int[] appWidgetIds1) {
appWidgetIds=appWidgetIds1;
appWidgetManager=appWidgetManager1;
context.startService(new Intent(context, UpdateService.class));
}
public static class UpdateService extends Service {
@Override
public void onStart(Intent intent, int startId) {
remoteViews = new RemoteViews(getPackageName(),R.layout.widget_layout);
Date month=new Date(System.currentTimeMillis());
todayDate=month.getDate();
todayMonth=currnetMonth=(month.getMonth())+1;
todayYear=currentYear=(month.getYear())+1900;
// Build the widget update for today
RemoteViews updateViews = buildUpdate(this);
// Push update for this widget to the home screen
ComponentName thisWidget = new ComponentName(this, MyWidgetProvider.class);
AppWidgetManager manager = AppWidgetManager.getInstance(this);
manager.updateAppWidget(thisWidget, updateViews);
}
public RemoteViews buildUpdate(Context context) {
list = UpdateWidgetDatas();
try{
int fr_size=list.length;
if(fr_size>0){
remoteViews.setViewVisibility(R.id.loading, View.GONE);
remoteViews.setViewVisibility(R.id.top_rel, View.VISIBLE);
remoteViews.setTextViewText(R.id.title, "title");
remoteViews.setTextViewText(R.id.des,"description");
remoteViews.setTextViewText(R.id.date, "todayDate");
remoteViews.setImageViewBitmap(R.id.friend_image, downloadBitMapImage("imagelink"));
}else{
remoteViews.setViewVisibility(R.id.top_rel, View.GONE);
remoteViews.setViewVisibility(R.id.loading, View.VISIBLE);
remoteViews.setTextViewText(R.id.loading, "No data Available.");
}
Intent BRHomePage = new Intent(context, HomePage.class);
PendingIntent HomePageIntent=PendingIntent.getActivity(context, 0 , BRHomePage,PendingIntent.FLAG_UPDATE_CURRENT);
remoteViews.setOnClickPendingIntent(R.id.top_rel, HomePageIntent);
}catch (Exception e) {
// TODO: handle exception
System.out.println("store error----"+e);
}
appWidgetManager.updateAppWidget(appWidgetIds, remoteViews);
return remoteViews;
}
public void onReceive(Context context, Intent intent)
{
final String action = intent.getAction();
if(action.equalsIgnoreCase("android.appwidget.action.APPWIDGET_DELETED")){
if(remoteViews!=null)
remoteViews=null;
}
}
@Override
public void onDestroy() {
System.gc();
Toast.makeText(this, "removed widger", Toast.LENGTH_SHORT).show();
}
public static List<String> UpdateWidgetDatas() {
try {
//return list value
}catch (Exception e) {
Log.e("", "FacebookDetails--->"+e);
}
return list;
}
Bitmap downloadBitMapImage(String imageUrl){
Bitmap imgBitmap=null;
try
{
URL url= new URL(imageUrl);
HttpURLConnection c = ( HttpURLConnection ) url.openConnection();
c.setDoInput(true);
c.connect();
InputStream is = c.getInputStream();
imgBitmap = BitmapFactory.decodeStream(is);
}
catch ( MalformedURLException e )
{
Log.d( "RemoteImageHandler", "fetchImage passed invalid URL: " + imageUrl );
}
catch ( IOException e )
{
Log.d( "RemoteImageHandler", "fetchImage IO exception: " + e );
}
return imgBitmap;
}
}
logcat 中出现错误：
10-29 17:25:51.849: ERROR/(160): Dumpstate > /data/log/dumpstate_app_error
10-29 17:25:51.849: ERROR/AndroidRuntime(7270): FATAL EXCEPTION: main
10-29 17:25:51.849: ERROR/AndroidRuntime(7270): java.lang.RuntimeException: Unable to start service cmyapp.MyWidgetProvider$UpdateService@4051e0c8 with Intent { cmp=cmyapp/.MyWidgetProvider$UpdateService }: java.lang.NullPointerException
10-29 17:25:51.849: ERROR/AndroidRuntime(7270): at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:2056)
10-29 17:25:51.849: ERROR/AndroidRuntime(7270): at android.app.ActivityThread.access$2800(ActivityThread.java:117)
10-29 17:25:51.849: ERROR/AndroidRuntime(7270): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:998)
10-29 17:25:51.849: ERROR/AndroidRuntime(7270): at android.os.Handler.dispatchMessage(Handler.java:99)
10-29 17:25:51.849: ERROR/AndroidRuntime(7270): at android.os.Looper.loop(Looper.java:130)
10-29 17:25:51.849: ERROR/AndroidRuntime(7270): at android.app.ActivityThread.main(ActivityThread.java:3687)
10-29 17:25:51.849: ERROR/AndroidRuntime(7270): at java.lang.reflect.Method.invokeNative(Native Method)
10-29 17:25:51.849: ERROR/AndroidRuntime(7270): at java.lang.reflect.Method.invoke(Method.java:507)
10-29 17:25:51.849: ERROR/AndroidRuntime(7270): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:867)
10-29 17:25:51.849: ERROR/AndroidRuntime(7270): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:625)
10-29 17:25:51.849: ERROR/AndroidRuntime(7270): at dalvik.system.NativeStart.main(Native Method)
10-29 17:25:51.849: ERROR/AndroidRuntime(7270): Caused by: java.lang.NullPointerException
10-29 17:25:51.849: ERROR/AndroidRuntime(7270): at android.widget.RemoteViews$ReflectionAction.writeToParcel(RemoteViews.java:730)
10-29 17:25:51.849: ERROR/AndroidRuntime(7270): at android.widget.RemoteViews.writeToParcel(RemoteViews.java:1376)
10-29 17:25:51.849: ERROR/AndroidRuntime(7270): at com.android.internal.appwidget.IAppWidgetService$Stub$Proxy.updateAppWidgetIds(IAppWidgetService.java:374)
10-29 17:25:51.849: ERROR/AndroidRuntime(7270): at android.appwidget.AppWidgetManager.updateAppWidget(AppWidgetManager.java:246)
10-29 17:25:51.849: ERROR/AndroidRuntime(7270): at cmyapp.MyWidgetProvider$UpdateService.buildUpdate(MyWidgetProvider.java:168)
10-29 17:25:51.849: ERROR/AndroidRuntime(7270): at cmyapp.MyWidgetProvider$UpdateService.onStart(MyWidgetProvider.java:87)
10-29 17:25:51.849: ERROR/AndroidRuntime(7270): at android.app.Service.onStartCommand(Service.java:428)
10-29 17:25:51.849: ERROR/AndroidRuntime(7270): at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:2043)
请推荐正确的方法，谢谢，