Android DialogFragment在方向更改时崩溃应用程序

我的

AlertFragment

有一个问题，当你第一次运行应用程序时，它显示得很好，但是当你旋转设备（方向改变）时，应用程序崩溃了

架构：

MainActivity

-->

ScheduledReclitFragment

-->

AlertFragment

主要活动（简化摘录）：

警报片段：

class AlertFragment extends DialogFragment {

String title;
String message;


public AlertFragment(String title, String message)  {

    this.title = title;
    this.message = message;
}


public AlertFragment()  {


}

@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
    AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(getActivity());
    alertDialogBuilder.setTitle(title);
    alertDialogBuilder.setMessage(message);
    //null should be your on click listener

    alertDialogBuilder.setNegativeButton("Dismiss", new DialogInterface.OnClickListener() {

        @Override
        public void onClick(DialogInterface dialog, int which) {
            dialog.dismiss();
        }
    });


    return alertDialogBuilder.create();
}
}

日志：

12-30 12:35:27.421  11871-11871/com.app.example E/AndroidRuntime﹕ FATAL EXCEPTION: main
    java.lang.RuntimeException: Unable to start activity ComponentInfo{com.app.example/com.app.example.MainActivity}: android.app.Fragment$InstantiationException: Unable to instantiate fragment com.app.example.AlertFragment: make sure class name exists, is public, and has an empty constructor that is public
            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2205)
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2255)
            at android.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:3727)
            at android.app.ActivityThread.access$700(ActivityThread.java:146)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1246)
            at android.os.Handler.dispatchMessage(Handler.java:99)
            at android.os.Looper.loop(Looper.java:137)
            at android.app.ActivityThread.main(ActivityThread.java:5171)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:511)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:797)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:564)
            at dalvik.system.NativeStart.main(Native Method)
     Caused by: android.app.Fragment$InstantiationException: Unable to instantiate fragment com.app.example.AlertFragment: make sure class name exists, is public, and has an empty constructor that is public
            at android.app.Fragment.instantiate(Fragment.java:600)
            at android.app.FragmentState.instantiate(Fragment.java:97)
            at android.app.FragmentManagerImpl.restoreAllState(FragmentManager.java:1747)
            at android.app.Activity.onCreate(Activity.java:922)
            at com.app.example.MainActivity.onCreate(MainActivity.java:28)
            at android.app.Activity.performCreate(Activity.java:5200)
            at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2169)
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2255)
            at android.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:3727)
            at android.app.ActivityThread.access$700(ActivityThread.java:146)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1246)
            at android.os.Handler.dispatchMessage(Handler.java:99)
            at android.os.Looper.loop(Looper.java:137)
            at android.app.ActivityThread.main(ActivityThread.java:5171)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:511)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:797)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:564)
            at dalvik.system.NativeStart.main(Native Method)
     Caused by: java.lang.IllegalAccessException: access to class not allowed
            at java.lang.Class.newInstanceImpl(Native Method)
            at java.lang.Class.newInstance(Class.java:1319)
            at android.app.Fragment.instantiate(Fragment.java:585)
            at android.app.FragmentState.instantiate(Fragment.java:97)
            at android.app.FragmentManagerImpl.restoreAllState(FragmentManager.java:1747)
            at android.app.Activity.onCreate(Activity.java:922)
            at com.app.example.MainActivity.onCreate(MainActivity.java:28)
            at android.app.Activity.performCreate(Activity.java:5200)
            at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2169)
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2255)
            at android.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:3727)
            at android.app.ActivityThread.access$700(ActivityThread.java:146)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1246)
            at android.os.Handler.dispatchMessage(Handler.java:99)
            at android.os.Looper.loop(Looper.java:137)
            at android.app.ActivityThread.main(ActivityThread.java:5171)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:511)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:797)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:564)
            at dalvik.system.NativeStart.main(Native Method)

---

好的，我找到了。。。解决方案是将

setRetainInstance（true）

放入

Dialog

的

onCreateDialog（）

方法中。

由于更改方向时警报片段会丢失数据，请使用捆绑包。您甚至可以通过在清单文件中为该活动添加

Configchanges

属性并将其值设置为

orientation

，来限制UI重新启动，这可能有助于situation@Astral投影我已经尝试使用

Bundle

，但这并没有改变任何事情@但是我不想限制我需要知道为什么会发生。

class AlertFragment extends DialogFragment {

String title;
String message;


public AlertFragment(String title, String message)  {

    this.title = title;
    this.message = message;
}


public AlertFragment()  {


}

@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
    AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(getActivity());
    alertDialogBuilder.setTitle(title);
    alertDialogBuilder.setMessage(message);
    //null should be your on click listener

    alertDialogBuilder.setNegativeButton("Dismiss", new DialogInterface.OnClickListener() {

        @Override
        public void onClick(DialogInterface dialog, int which) {
            dialog.dismiss();
        }
    });


    return alertDialogBuilder.create();
}
}

12-30 12:35:27.421  11871-11871/com.app.example E/AndroidRuntime﹕ FATAL EXCEPTION: main
    java.lang.RuntimeException: Unable to start activity ComponentInfo{com.app.example/com.app.example.MainActivity}: android.app.Fragment$InstantiationException: Unable to instantiate fragment com.app.example.AlertFragment: make sure class name exists, is public, and has an empty constructor that is public
            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2205)
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2255)
            at android.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:3727)
            at android.app.ActivityThread.access$700(ActivityThread.java:146)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1246)
            at android.os.Handler.dispatchMessage(Handler.java:99)
            at android.os.Looper.loop(Looper.java:137)
            at android.app.ActivityThread.main(ActivityThread.java:5171)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:511)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:797)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:564)
            at dalvik.system.NativeStart.main(Native Method)
     Caused by: android.app.Fragment$InstantiationException: Unable to instantiate fragment com.app.example.AlertFragment: make sure class name exists, is public, and has an empty constructor that is public
            at android.app.Fragment.instantiate(Fragment.java:600)
            at android.app.FragmentState.instantiate(Fragment.java:97)
            at android.app.FragmentManagerImpl.restoreAllState(FragmentManager.java:1747)
            at android.app.Activity.onCreate(Activity.java:922)
            at com.app.example.MainActivity.onCreate(MainActivity.java:28)
            at android.app.Activity.performCreate(Activity.java:5200)
            at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2169)
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2255)
            at android.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:3727)
            at android.app.ActivityThread.access$700(ActivityThread.java:146)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1246)
            at android.os.Handler.dispatchMessage(Handler.java:99)
            at android.os.Looper.loop(Looper.java:137)
            at android.app.ActivityThread.main(ActivityThread.java:5171)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:511)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:797)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:564)
            at dalvik.system.NativeStart.main(Native Method)
     Caused by: java.lang.IllegalAccessException: access to class not allowed
            at java.lang.Class.newInstanceImpl(Native Method)
            at java.lang.Class.newInstance(Class.java:1319)
            at android.app.Fragment.instantiate(Fragment.java:585)
            at android.app.FragmentState.instantiate(Fragment.java:97)
            at android.app.FragmentManagerImpl.restoreAllState(FragmentManager.java:1747)
            at android.app.Activity.onCreate(Activity.java:922)
            at com.app.example.MainActivity.onCreate(MainActivity.java:28)
            at android.app.Activity.performCreate(Activity.java:5200)
            at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2169)
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2255)
            at android.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:3727)
            at android.app.ActivityThread.access$700(ActivityThread.java:146)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1246)
            at android.os.Handler.dispatchMessage(Handler.java:99)
            at android.os.Looper.loop(Looper.java:137)
            at android.app.ActivityThread.main(ActivityThread.java:5171)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:511)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:797)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:564)
            at dalvik.system.NativeStart.main(Native Method)