Question

该应用程序有一个主要活动和两个片段。主要活动主机MainFragment和MainFragment包含提交BreedingFragment（运行）的按钮。只有在方向未更改时应用程序才能正常工作，但在BreedingFragment打开且方向发生变化时崩溃。

在对 stackoverflow 进行了几个小时的调查后，我找到了以下文章并按照答案进行了调查，但没有调试问题。

Android Application Crashes With Orientation Changes
Orientation change Crash Application
Rotation of screen crashes android app
My Android application crashes when I change screen orientation

答案主要建议在AndroidManifest.xml中使用以下代码：

android:configChanges="orientation|keyboardHidden|screenSize"

最后一个帖子建议考虑以下因素：

每次设备活动都会停止并重新启动方向变化。你需要写下你的线程，即停止线程并在设备更改时重新启动它取向，也许是在两者之间挽救国家。

MainActivity：

public class MainActivity extends FragmentActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }
}

MainFragment：

public class MainFragment extends Fragment {
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {

        View v = inflater.inflate(R.layout.fragment_main, container, false);

        Button breedButton = (Button) v.findViewById(R.id.pokemon_breeding_button);

        breedButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                final FragmentManager fragmentManager = getActivity().getSupportFragmentManager();
                final FragmentTransaction transaction = fragmentManager.beginTransaction();
                transaction.replace(R.id.fragment, new BreedingFragment());
                transaction.addToBackStack(null);
                transaction.commit();
            }
        });
        return v;
    }
}

BreedingFragment：

public class BreedingFragment extends Fragment {

    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {

        return inflater.inflate(R.layout.fragment_breeding, container, false);
    }
}

Log Cat：

E/AndroidRuntime: FATAL EXCEPTION: main
                  Process: com.revittechnology.zapdos, PID: 12795
                  java.lang.RuntimeException: Unable to start activity ComponentInfo{com.revittechnology.zapdos/com.revittechnology.zapdos.MainActivity}: android.view.InflateException: Binary XML file line #24: Error inflating class fragment
                      at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2429)
                      at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2493)
                      at android.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:4014)
                      at android.app.ActivityThread.access$900(ActivityThread.java:166)
                      at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1289)
                      at android.os.Handler.dispatchMessage(Handler.java:102)
                      at android.os.Looper.loop(Looper.java:136)
                      at android.app.ActivityThread.main(ActivityThread.java:5590)
                      at java.lang.reflect.Method.invokeNative(Native Method)
                      at java.lang.reflect.Method.invoke(Method.java:515)
                      at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1280)
                      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1096)
                      at dalvik.system.NativeStart.main(Native Method)
                   Caused by: android.view.InflateException: Binary XML file line #24: Error inflating class fragment
                      at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:720)
                      at android.view.LayoutInflater.rInflate(LayoutInflater.java:762)
                      at android.view.LayoutInflater.rInflate(LayoutInflater.java:771)
                      at android.view.LayoutInflater.rInflate(LayoutInflater.java:771)
                      at android.view.LayoutInflater.inflate(LayoutInflater.java:499)
                      at android.view.LayoutInflater.inflate(LayoutInflater.java:398)
                      at android.view.LayoutInflater.inflate(LayoutInflater.java:354)
                      at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:331)
                      at android.app.Activity.setContentView(Activity.java:2018)
                      at com.revittechnology.zapdos.MainActivity.onCreate(MainActivity.java:13)
                      at android.app.Activity.performCreate(Activity.java:5447)
                      at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1094)
                      at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2393)
                      at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2493) 
                      at android.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:4014) 
                      at android.app.ActivityThread.access$900(ActivityThread.java:166) 
                      at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1289) 
                      at android.os.Handler.dispatchMessage(Handler.java:102) 
                      at android.os.Looper.loop(Looper.java:136) 
                      at android.app.ActivityThread.main(ActivityThread.java:5590) 
                      at java.lang.reflect.Method.invokeNative(Native Method) 
                      at java.lang.reflect.Method.invoke(Method.java:515) 
                      at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1280) 
                      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1096) 
                      at dalvik.system.NativeStart.main(Native Method) 
                   Caused by: java.lang.IllegalStateException: Fragment com.revittechnology.zapdos.MainFragment did not create a view.
                      at android.support.v4.app.FragmentManagerImpl.onCreateView(FragmentManager.java:2319)
                      at android.support.v4.app.FragmentController.onCreateView(FragmentController.java:120)
                      at android.support.v4.app.FragmentActivity.dispatchFragmentsOnCreateView(FragmentActivity.java:356)
                      at android.support.v4.app.BaseFragmentActivityHoneycomb.onCreateView(BaseFragmentActivityHoneycomb.java:31)
                      at android.support.v4.app.FragmentActivity.onCreateView(FragmentActivity.java:79)
                      at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:696)
                      at android.view.LayoutInflater.rInflate(LayoutInflater.java:762) 
                      at android.view.LayoutInflater.rInflate(LayoutInflater.java:771) 
                      at android.view.LayoutInflater.rInflate(LayoutInflater.java:771) 
                      at android.view.LayoutInflater.inflate(LayoutInflater.java:499) 
                      at android.view.LayoutInflater.inflate(LayoutInflater.java:398) 
                      at android.view.LayoutInflater.inflate(LayoutInflater.java:354) 
                      at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:331) 
                      at android.app.Activity.setContentView(Activity.java:2018) 
                      at com.revittechnology.zapdos.MainActivity.onCreate(MainActivity.java:13) 
                      at android.app.Activity.performCreate(Activity.java:5447) 
                      at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1094) 
                      at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2393) 
                      at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2493) 
                      at android.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:4014) 
                      at android.app.ActivityThread.access$900(ActivityThread.java:166) 
                      at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1289) 
                      at android.os.Handler.dispatchMessage(Handler.java:102) 
                      at android.os.Looper.loop(Looper.java:136) 
                      at android.app.ActivityThread.main(ActivityThread.java:5590) 
                      at java.lang.reflect.Method.invokeNative(Native Method) 
                      at java.lang.reflect.Method.invoke(Method.java:515) 
                      at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1280) 
                      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1096) 
                      at dalvik.system.NativeStart.main(Native Method) 
I/Process: Sending signal. PID: 12795 SIG: 9
Application terminated.

Answer 1

上面的照片详细说明了这个案例。托管MainActivity.java的{{1}}和主片段有一个按钮，用于启动另一个片段。

我的要求是什么？

主要活动只承载主片段，但没有别的什么。
Main Fragment具有启动第二个片段的按钮。
按下后退按钮时关闭（结束/完成）第二个片段（返回主要活动）。
使用设备（屏幕）旋转。

第一步是创建主要活动。主要活动中考虑的内容很少：

将MainFragment.java扩展为MainActivity

FragmentActivity如下：

检查public class MainActivity extends FragmentActivity，如果是savedInstanceState，请运行。{ MainFragment。我们这样做的原因是为了避免再次运行以及设备轮换的MainFragment。

以下是 null 的代码：

MainActivity.java

确保在 public class MainActivity extends FragmentActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); if (savedInstanceState == null) { FragmentManager fManager = getSupportFragmentManager(); FragmentTransaction fTransaction = fManager.beginTransaction(); fTransaction.add(R.id.fragment, new MainFragment()); fTransaction.commit(); } } } ：

activity_main.xml

现在创建 <FrameLayout android:layout_width="match_parent" android:layout_height="match_parent" android:name="com.revittechnology.zapdos.MainFragment" android:id="@+id/fragment" /> ：

MainFragment.java

在返回视图（public class MainFragment extends Fragment { @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View v = inflater.inflate(R.layout.fragment_main, container, false); // Inflate the layout for this fragment Button breedButton = (Button) v.findViewById(R.id.pokemon_breeding_button); breedButton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { final FragmentManager fragmentManager = getActivity().getSupportFragmentManager(); final FragmentTransaction transaction = fragmentManager.beginTransaction(); transaction.replace(R.id.fragment, new BreedingFragment()); transaction.addToBackStack("tag"); transaction.commit(); } }); return v; } }）之前包含所有代码，因为如果视图不存在，则无法找到按钮和布局的其他元素。 return v有助于将片段添加到后台堆栈中，并允许返回以通过反压来关闭片段。

现在创建第二个片段 BreedingFragment.java` ：

transaction.addToBackStack("tag");

注意：在声明课程之前，请导入上述课程所需的库。

结论：应用程序因设备方向而崩溃，因为第二个片段是通过按钮点击启动的，MainFragment是MainActivity的主机。使用设备方向时，片段已关闭，public class BreedingFragment extends Fragment { public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { // Inflate the layout for this fragment return inflater.inflate(R.layout.fragment_breeding, container, false); } }中没有代码可再次启动片段，因此，它提供了空的异常错误。将片段相关代码添加到MainActivity.java中以启动片段以编程方式解决问题。

Android应用程序因方向更改而崩溃

1 个答案: