根据一个answer由CommonsWare:为什么在应用程序运行时调用onResume()?
onResume()
被称为任何时间的活动正在恢复前景 输入。这包括:
当它返回到屏幕后,别的东西有 前景(例如,设置),以及
当它首次在这一过程中被创建(其中 包括所需的任何新的过程,因为你杀了从 DDMS旧)
因此,您的代码将检查无论是振铃模式的状态的情况下,将在任何情况下使用正确的图像。
但在我的情况下,onResume()
被调用,而应用程序正在运行没有任何上述条件。 onResume()
有一个refresh()
方法,它显示一个ProgressBar
,加载WebView
中的一些内容,然后隐藏ProgressBar
并显示WebView
。
请注意,它并不总是发生,但大部分时间都是这样。
我真的很好奇,知道为什么发生这种情况,如果可能的话,我怎么能阻止它,因为它真的让用户看到它发生令人讨厌的事情。
代码:
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();
}
编辑 这是我Thread.dumpStack()
后得到了(这表明两次在logcat中,所以onResume()被调用两次):
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()
,并且日志再次以:
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
我认为这与WebView
有关,也许密集工作使它暂停和恢复?
此外,我收到编舞的警告。这一切都发生的原因是WebView
我相信,因为它显示了JavaScript图表。 WebView
是否在主线程中处理?
请发布您的代码,以便我们可以理解为什么发生这种情况并帮助您 – SoulRayder
之前我已经看到onResume()被调用两次(没有onPause())。这是一个三星Galaxy Tab 2. – tristan2468
我张贴了一些代码,但我不知道是否有更多的代码需要 – TGO