Intereting Posts
   

隐藏视图时崩溃

我在列表视图的顶部有一个搜索栏,并且有一个操作按钮可以切换搜索栏的可见性…

搜索栏显示正确,但是当我隐藏它时,应用程序崩溃了。 这是切换视图的代码……

/** * Show / Hide the search box */ private void toggleSearch() { //in the instance there are not customers...a crash will occur when searching if(customers.length > 0) { if(searchVisible)//hide the search bar { searchFrame.setVisibility(View.GONE); Log.i("SEARCH", "HIDDEN"); searchVisible = false; Log.i("SEARCH", "BOOLEAN SET"); resetList(); Log.i("SEARCH", "LIST RESET?"); } else//show the search bar { searchFrame.setVisibility(View.VISIBLE); searchVisible = true; } } } 

这是LogCat输出……

 11-18 11:33:22.483: I/SEARCH(1591): SHOWN 11-18 11:33:22.493: D/audio_hw_primary(183): select_devices: out_snd_device(4: headphones) in_snd_device(0: ) 11-18 11:33:22.753: D/audio_hw_primary(183): out_set_parameters: enter: usecase(0: deep-buffer-playback) kvpairs: routing=4 11-18 11:33:24.473: I/SEARCH(1591): HIDDEN 11-18 11:33:24.473: I/SEARCH(1591): BOOLEAN SET 11-18 11:33:24.473: I/SEARCH(1591): LIST RESET? 11-18 11:33:24.473: D/AndroidRuntime(1591): Shutting down VM 11-18 11:33:24.473: E/AndroidRuntime(1591): FATAL EXCEPTION: main 11-18 11:33:24.473: E/AndroidRuntime(1591): Process: evans.louis.firstdroid, PID: 1591 11-18 11:33:24.473: E/AndroidRuntime(1591): java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.TextView.setText(java.lang.CharSequence)' on a null object reference 11-18 11:33:24.473: E/AndroidRuntime(1591): at android.widget.ArrayAdapter.createViewFromResource(ArrayAdapter.java:392) 11-18 11:33:24.473: E/AndroidRuntime(1591): at android.widget.ArrayAdapter.getView(ArrayAdapter.java:362) 11-18 11:33:24.473: E/AndroidRuntime(1591): at android.widget.AbsListView.obtainView(AbsListView.java:2263) 11-18 11:33:24.473: E/AndroidRuntime(1591): at android.widget.ListView.measureHeightOfChildren(ListView.java:1263) 11-18 11:33:24.473: E/AndroidRuntime(1591): at android.widget.ListView.onMeasure(ListView.java:1175) 11-18 11:33:24.473: E/AndroidRuntime(1591): at android.view.View.measure(View.java:16458) 11-18 11:33:24.473: E/AndroidRuntime(1591): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125) 11-18 11:33:24.473: E/AndroidRuntime(1591): at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1404) 11-18 11:33:24.473: E/AndroidRuntime(1591): at android.widget.LinearLayout.measureVertical(LinearLayout.java:695) 11-18 11:33:24.473: E/AndroidRuntime(1591): at android.widget.LinearLayout.onMeasure(LinearLayout.java:588) 11-18 11:33:24.473: E/AndroidRuntime(1591): at android.view.View.measure(View.java:16458) 11-18 11:33:24.473: E/AndroidRuntime(1591): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125) 11-18 11:33:24.473: E/AndroidRuntime(1591): at android.widget.FrameLayout.onMeasure(FrameLayout.java:310) 11-18 11:33:24.473: E/AndroidRuntime(1591): at android.view.View.measure(View.java:16458) 11-18 11:33:24.473: E/AndroidRuntime(1591): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125) 11-18 11:33:24.473: E/AndroidRuntime(1591): at com.android.internal.widget.ActionBarOverlayLayout.onMeasure(ActionBarOverlayLayout.java:327) 11-18 11:33:24.473: E/AndroidRuntime(1591): at android.view.View.measure(View.java:16458) 11-18 11:33:24.473: E/AndroidRuntime(1591): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125) 11-18 11:33:24.473: E/AndroidRuntime(1591): at android.widget.FrameLayout.onMeasure(FrameLayout.java:310) 11-18 11:33:24.473: E/AndroidRuntime(1591): at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2289) 11-18 11:33:24.473: E/AndroidRuntime(1591): at android.view.View.measure(View.java:16458) 11-18 11:33:24.473: E/AndroidRuntime(1591): at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:1914) 11-18 11:33:24.473: E/AndroidRuntime(1591): at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1111) 11-18 11:33:24.473: E/AndroidRuntime(1591): at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1293) 11-18 11:33:24.473: E/AndroidRuntime(1591): at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:998) 11-18 11:33:24.473: E/AndroidRuntime(1591): at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5582) 11-18 11:33:24.473: E/AndroidRuntime(1591): at android.view.Choreographer$CallbackRecord.run(Choreographer.java:749) 11-18 11:33:24.473: E/AndroidRuntime(1591): at android.view.Choreographer.doCallbacks(Choreographer.java:562) 11-18 11:33:24.473: E/AndroidRuntime(1591): at android.view.Choreographer.doFrame(Choreographer.java:532) 11-18 11:33:24.473: E/AndroidRuntime(1591): at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:735) 11-18 11:33:24.473: E/AndroidRuntime(1591): at android.os.Handler.handleCallback(Handler.java:733) 11-18 11:33:24.473: E/AndroidRuntime(1591): at android.os.Handler.dispatchMessage(Handler.java:95) 11-18 11:33:24.473: E/AndroidRuntime(1591): at android.os.Looper.loop(Looper.java:137) 11-18 11:33:24.473: E/AndroidRuntime(1591): at android.app.ActivityThread.main(ActivityThread.java:4998) 11-18 11:33:24.473: E/AndroidRuntime(1591): at java.lang.reflect.Method.invoke(Native Method) 11-18 11:33:24.473: E/AndroidRuntime(1591): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:777) 11-18 11:33:24.473: E/AndroidRuntime(1591): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:593) 11-18 11:33:24.483: W/ActivityManager(609): Force finishing activity evans.louis.firstdroid/com.firsthosted.firstdroid.CustomerList 

有任何想法吗?

谢谢

编辑:这里是请求的resetList()

 /** * Revert the ListView to it's original order */ private void resetList() { try { adapter = new ArrayAdapter(this, R.layout.listview_container, R.id.name, customers); lv.setAdapter(adapter); } catch(Exception e) { Library.errorHandler("resetList", e); } } 

刚刚在resetList()中发现了我的错误

我有…

 adapter = new ArrayAdapter(this, R.layout.listview_container, R.id.name, customers); 

它应该是……

 adapter = new ArrayAdapter(this, R.layout.listview_text, R.id.name, customers); 

你在一个null的元素上调用setText,我假设你在if语句之外调用.setText方法。