【发布时间】：2014-07-07 14:37:53
【问题描述】：
我有一个每 5 分钟运行一次的 IntentService。此服务检查服务器上是否有任何警报。警报位于二维 ArrayList 中，我将其传递给 Activity 以显示在列表中。
目前，如果我启动应用程序并让它运行一个小时，堆栈上将有 12 个活动。用户必须单击后退按钮 12 次才能关闭所有活动。
我希望新的 ArrayList 被传递给堆栈上的原始 Activity，并且它的 listView 会使用新数据进行更新。
我确定我必须重写 onNewIntent 并在适配器上调用 notifyDataSetChanged。
有没有人知道如何做到这一点？ 我在正确的路线上吗？
public class ShowAlertsIntentService extends IntentService{
private static final String TAG = ShowAlertsIntentService.class.getSimpleName();
RROnCallApplication rrOnCallApp;
DateTime from;
DateTime to;
TwoDimensionalArrayList<String> alertsArray;
public ShowAlertsIntentService() {
super("ShowAlertsIntentService");
}
@Override
protected void onHandleIntent(Intent intent) {
Log.e(TAG, "inside onHandleIntent of ShowAlertsIntentService");
rrOnCallApp = (RROnCallApplication) getApplication();
from = new DateTime();
to = from.plusDays(1);
DateTimeFormatter fmt = DateTimeFormat.forPattern("d-MMM-Y");
String formattedfrom = fmt.print(from);
String formattedTo = fmt.print(to);
alertsArray = rrOnCallApp.webService.getAlerts("1", formattedfrom, formattedTo);
if(alertsArray != null){
Log.e(TAG, "size of alertArray = " + alertsArray.size());
String noCallsStatus = null;
String outOfRangeStatus = null;
ArrayList arrayList = (ArrayList) alertsArray.get(0);
noCallsStatus = (String) arrayList.get(0);
if((alertsArray.size() == 1) && (noCallsStatus.equalsIgnoreCase("no sig") || noCallsStatus.equalsIgnoreCase("no data"))){
//do nothing
Log.e(TAG, "no data or no sig sent back when getting alerts");
}else{
Intent intentShowAlertsActivity = new Intent(this, ShowAlertsActivity.class);
Bundle b = new Bundle();
b.putSerializable("alertsarray", alertsArray);
intentShowAlertsActivity.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
intentShowAlertsActivity.putExtra("alertsarraybundle", b);
startActivity(intentShowAlertsActivity);
}
}else{
Log.e(TAG, "alertsArray = null!!!!!");
}
}
}
.
public class AlertsFragment extends ListFragment{
private static final String TAG = AlertsFragment.class.getSimpleName();
MySimpleArrayAdapter myAdapter;
ArrayList<String> alertsArray;
TextView alertTitle;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Bundle b = getArguments();
if(b != null){
alertsArray = (ArrayList<String>) b.get("alertsArray");
Log.e(TAG, "alertsArray in AlertsFragment has size " + alertsArray.size());
}else{
Log.e(TAG, "Bundle b = null!!!!!!!!!!!");
}
}//end of onCreate
。 [编辑1]
07-07 15:46:26.056: E/AndroidRuntime(8253): FATAL EXCEPTION: IntentService[ShowAlertsIntentService]
07-07 15:46:26.056: E/AndroidRuntime(8253): android.util.AndroidRuntimeException: Calling startActivity() from outside of an Activity context requires the FLAG_ACTIVITY_NEW_TASK flag. Is this really what you want?
07-07 15:46:26.056: E/AndroidRuntime(8253): at android.app.ContextImpl.startActivity(ContextImpl.java:864)
07-07 15:46:26.056: E/AndroidRuntime(8253): at android.content.ContextWrapper.startActivity(ContextWrapper.java:276)
07-07 15:46:26.056: E/AndroidRuntime(8253): at com.carefreegroup.rr3.carefreeoncall.ShowAlertsIntentService.onHandleIntent(ShowAlertsIntentService.java:90)
07-07 15:46:26.056: E/AndroidRuntime(8253): at android.app.IntentService$ServiceHandler.handleMessage(IntentService.java:65)
07-07 15:46:26.056: E/AndroidRuntime(8253): at android.os.Handler.dispatchMessage(Handler.java:99)
07-07 15:46:26.056: E/AndroidRuntime(8253): at android.os.Looper.loop(Looper.java:137)
07-07 15:46:26.056: E/AndroidRuntime(8253): at android.os.HandlerThread.run(HandlerThread.java:60)
.
[编辑 2]
<activity
android:name=".ShowAlertsActivity"
android:screenOrientation="landscape" />
编辑3
@Override
protected void onNewIntent(Intent intent) {
super.onNewIntent(intent);
Log.e(TAG, "Inside onNewIntent");
alertsArray = (ArrayList<String>) getIntent().getBundleExtra("alertsarraybundle").get("alertsarray");
Log.e(TAG, "size of alertArray in ShowAlertsActivity = " + alertsArray.size());
Bundle b = new Bundle();
b.putSerializable("alertsArray", alertsArray);
Fragment newFragment = new AlertsFragment();
newFragment.setArguments(b);
FragmentTransaction transaction = getFragmentManager().beginTransaction();
// Replace whatever is in the fragment_container view with this fragment,
// and add the transaction to the back stack
transaction.replace(R.id.showalertslistfragment_container, newFragment);
//transaction.addToBackStack(null);
// Commit the transaction
transaction.commit();
}
【问题讨论】：
-
为什么选择 FLAG_ACTIVITY_NEW_TASK ？每次它都会开始一个新的活动并将前一个活动向下推..
-
@RanjitPati 我不记得为什么现在因为我在很久以前编写了它。我认为 Android 说我必须在从后台线程启动 Activity 时设置此标志？
-
ok..然后删除这一行并检查一次..也许它会解决你的问题..
-
好的，我已经把它注释掉了，我在edit1中得到了错误
-
Manifest 中如何定义您的 Activity？
标签： android listview android-intentservice