根據一個answer由CommonsWare:爲什麼在應用程序運行時調用onResume()?
onResume()
被稱爲任何時間的活動正在恢復前景 輸入。這包括:
當它返回到屏幕後,別的東西有 前景(例如,設置),以及
當它首次在這一過程中被創建(其中 包括所需的任何新的過程,因爲你殺了從 DDMS舊)
因此,您的代碼將檢查無論是振鈴模式的狀態的情況下,將在任何情況下使用正確的圖像。
但在我的情況下,onResume()
被調用,而應用程序正在運行沒有任何上述條件。 onResume()
有一個refresh()
方法,它顯示一個ProgressBar
,加載WebView
中的一些內容,然後隱藏ProgressBar
並顯示WebView
。
請注意,它並不總是發生,但大部分時間都是這樣。
我真的很好奇,知道爲什麼發生這種情況,如果可能的話,我怎麼能阻止它,因爲它真的讓用戶看到它發生令人討厭的事情。
代碼:
public void refresh()
{
webView.clearCache(true);
layout.setVisibility(View.GONE);
progress.setVisibility(View.VISIBLE);
fetcher = new DataFetcher();
String url = "http...." // some url
fetcher.execute(url);
}
public void onResume()
{
super.onResume();
refresh();
}
編輯 這是我Thread.dumpStack()
後得到了(這表明兩次在logcat中,所以onResume()被調用兩次):
12-12 10:36:22.033: W/HardwareRenderer(22358): Attempting to initialize hardware acceleration outside of the main thread, aborting
12-12 10:36:24.947: W/HardwareRenderer(22358): Attempting to initialize hardware acceleration outside of the main thread, aborting
12-12 10:36:26.744: W/HardwareRenderer(22358): Attempting to initialize hardware acceleration outside of the main thread, aborting
12-12 10:36:27.064: W/System.err(22358): java.lang.Throwable: stack dump
12-12 10:36:27.088: W/System.err(22358): at java.lang.Thread.dumpStack(Thread.java:496)
12-12 10:36:27.088: W/System.err(22358): at com.example.app.menufragments.SalesByPointsFragment.onResume(SampleFragment.java:101)
12-12 10:36:27.088: W/System.err(22358): at android.support.v4.app.Fragment.performResume(Fragment.java:1543)
12-12 10:36:27.088: W/System.err(22358): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:963)
12-12 10:36:27.088: W/System.err(22358): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1104)
12-12 10:36:27.088: W/System.err(22358): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1086)
12-12 10:36:27.088: W/System.err(22358): at android.support.v4.app.FragmentManagerImpl.dispatchResume(FragmentManager.java:1894)
12-12 10:36:27.088: W/System.err(22358): at android.support.v4.app.FragmentActivity.onResumeFragments(FragmentActivity.java:466)
12-12 10:36:27.088: W/System.err(22358): at android.support.v4.app.FragmentActivity.onPostResume(FragmentActivity.java:455)
12-12 10:36:27.088: W/System.err(22358): at com.actionbarsherlock.app.SherlockFragmentActivity.onPostResume(SherlockFragmentActivity.java:68)
12-12 10:36:27.088: W/System.err(22358): at android.app.Activity.performResume(Activity.java:5195)
12-12 10:36:27.088: W/System.err(22358): at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2860)
12-12 10:36:27.088: W/System.err(22358): at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:2899)
12-12 10:36:27.088: W/System.err(22358): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1289)
12-12 10:36:27.088: W/System.err(22358): at android.os.Handler.dispatchMessage(Handler.java:99)
12-12 10:36:27.088: W/System.err(22358): at android.os.Looper.loop(Looper.java:137)
12-12 10:36:27.088: W/System.err(22358): at android.app.ActivityThread.main(ActivityThread.java:5227)
12-12 10:36:27.096: W/System.err(22358): at java.lang.reflect.Method.invokeNative(Native Method)
12-12 10:36:27.096: W/System.err(22358): at java.lang.reflect.Method.invoke(Method.java:511)
12-12 10:36:27.096: W/System.err(22358): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:795)
12-12 10:36:27.096: W/System.err(22358): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:562)
12-12 10:36:27.096: W/System.err(22358): at dalvik.system.NativeStart.main(Native Method)
我也把Thread.dumpStack()
在onPause()
,並且日誌再次以:
12-12 10:55:38.502: W/HardwareRenderer(29996): Attempting to initialize hardware acceleration outside of the main thread, aborting
12-12 10:55:38.572: W/HardwareRenderer(29996): Attempting to initialize hardware acceleration outside of the main thread, aborting
12-12 10:55:46.369: W/HardwareRenderer(29996): Attempting to initialize hardware acceleration outside of the main thread, aborting
12-12 10:55:50.736: W/HardwareRenderer(29996): Attempting to initialize hardware acceleration outside of the main thread, aborting
我認爲這與WebView
有關,也許密集工作使它暫停和恢復?
此外,我收到編舞的警告。這一切都發生的原因是WebView
我相信,因爲它顯示了JavaScript圖表。 WebView
是否在主線程中處理?
請發佈您的代碼,以便我們可以理解爲什麼發生這種情況並幫助您 – SoulRayder
之前我已經看到onResume()被調用兩次(沒有onPause())。這是一個三星Galaxy Tab 2. – tristan2468
我張貼了一些代碼,但我不知道是否有更多的代碼需要 – TGO