我有一個奇怪的問題,我的應用程序 -onStart()之後直接調用片段onStop() - 爲什麼?
一個有一個包含片段的片段活動 - )該片段啓動一個的AsyncTask的onCreate(和取消的AsyncTask的onStop()。我的問題出現了,因爲雖然我的片段保持運行&沒有被遮擋,但onStop()在onCreate()後幾乎直接調用。
有誰知道如何跟蹤爲什麼會發生這種情況?
09-28 11:41:56.785: VERBOSE/SearchFragment1(924): onCreate()
09-28 11:41:56.796: VERBOSE/SearchFragment1(924): onStop()
編輯
我已經刪除從片段中的代碼,我仍然感到困惑絕對 - 的問題仍然存在!我已經添加了幾行日誌記錄:
09-28 14:09:00.242: VERBOSE/SearchResultsFragment1(1789): onAttach()
09-28 14:09:00.242: VERBOSE/SearchResultsFragment1(1789): onCreate()
09-28 14:09:00.242: VERBOSE/SearchResultsFragment1(1789): onCreateView()
09-28 14:09:00.242: VERBOSE/SearchResultsFragment1(1789): onActivityCreated()
09-28 14:09:00.242: VERBOSE/SearchResultsFragment1(1789): onStart()
09-28 14:09:00.246: VERBOSE/SearchResultsFragment1(1789): onStop()
09-28 14:09:00.246: VERBOSE/SearchResultsFragment1(1789): onStart()
09-28 14:09:00.246: VERBOSE/SearchResultsFragment1(1789): onResume()
上述行爲是......莫名其妙。在活動中使用的代碼如下所示:
if(savedInstanceState == null)
{
try {
FragmentTransaction transaction= getSupportFragmentManager().beginTransaction();
Fragment currentFragment= (Fragment)Class.forName(getIntent().getAction()).newInstance();
transaction.replace(R.id.singlePane, currentFragment);
transaction.commit();
} catch ...
這是片段,因爲它在調試期間表示:
private static final boolean LOGGING_ENABLED = true;
private static int global_creation_count = 0;
private int local_count = global_creation_count;
@Override
public void onAttach(Activity activity) {
super.onAttach(activity);
if(LOGGING_ENABLED) Log.v(this.getClass().getSimpleName() + local_count, "onAttach()");
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
global_creation_count+=1;
if(LOGGING_ENABLED) Log.v(this.getClass().getSimpleName() + local_count, "onCreate()");
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
if(LOGGING_ENABLED) Log.v(this.getClass().getSimpleName() + local_count, "onCreateView()");
return super.onCreateView(inflater, container, savedInstanceState);
}
@Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
if(LOGGING_ENABLED) Log.v(this.getClass().getSimpleName() + local_count,
"onActivityCreated()");
}
@Override
public void onStart() {
super.onStart();
if(LOGGING_ENABLED) Log.v(this.getClass().getSimpleName() + local_count, "onStart()");
}
@Override
public void onResume() {
super.onResume();
if(LOGGING_ENABLED) Log.v(this.getClass().getSimpleName() + local_count, "onResume()");
}
// Fragment is active
@Override
public void onPause() {
super.onPause();
if(LOGGING_ENABLED) Log.v(this.getClass().getSimpleName() + local_count, "onPause()");
}
@Override
public void onStop() {
super.onStop();
if(LOGGING_ENABLED) Log.v(this.getClass().getSimpleName() + local_count, "onStop()");
}
@Override
public void onDestroyView() {
super.onDestroyView();
if(LOGGING_ENABLED) Log.v(this.getClass().getSimpleName() + local_count, "onDestroyView()");
}
@Override
public void onDestroy() {
super.onDestroy();
if(LOGGING_ENABLED) Log.v(this.getClass().getSimpleName() + local_count, "onDestroy()");
}
@Override
public void onDetach() {
super.onDetach();
if(LOGGING_ENABLED) Log.v(this.getClass().getSimpleName() + local_count, "onDetach()");
}
EDIT2
從代碼似乎的onStop( )在onStart()之後被直接調用。我試圖通過在onCreateView()中添加Thread.sleep(1000)來查看它是否與onStart()同時被調用。輸出是相同的 - 這使我相信onStop()被直接從Fragment創建過程調用/引發。
EDIT3
堆棧跟蹤上的onStop()打破時:
我要去嘗試,並附源代碼和步發現問題的所在。
謝謝 - 這讓我非常痛苦。我想這是一箇舊版本的suppport庫中的錯誤。 – Tom