Question

在我的应用程序中，我有一个寻呼机作为主视图，我在onStart（）中填充它但是当我旋转屏幕时它崩溃（因为它找不到视图）。

@Override
public void onStart() {
    super.onStart();

    createPager();


} 

void createPager(){


    // Instantiate a ViewPager and a PagerAdapter.
    mPager = (ViewPager) findViewById(R.id.pager);
    mPagerAdapter = new ScreenSlidePagerAdapter(getSupportFragmentManager());
    mPager.setAdapter(mPagerAdapter);

}

每次旋转设备时，我应该在哪里填充寻呼机，以便重新填充？

EDIT2：

这是我片段的代码

public class WakeyFragment extends Fragment {

        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container,
                                 Bundle savedInstanceState) {
            ViewGroup wakeyView = (ViewGroup) inflater.inflate(
                    R.layout.wakey, container, false);

            return wakeyView;
        }
        @Override
        public void onSaveInstanceState(final Bundle outState) {
            // super.onSaveInstanceState(outState);
        }
    }

    public class PremiumFragment extends Fragment {

        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container,
                                 Bundle savedInstanceState) {
            ViewGroup premiumView = (ViewGroup) inflater.inflate(
                    R.layout.premium_features, container, false);


            return premiumView;
        }


        @Override
        public void onViewCreated(View view, Bundle savedInstanceState) {
            super.onViewCreated(view, savedInstanceState);

            setViews();
            buttonSetup();
            autoWakeCheck();
            cpuWakeCheck();

            if (WakeService.isAwake) {
                glow.setVisibility(View.VISIBLE);
            }
            else {
                glow.setVisibility(View.INVISIBLE);
            }


        }
        @Override
        public void onSaveInstanceState(final Bundle outState) {
            // super.onSaveInstanceState(outState);
        }
    }

setViews（）是我在我的xml中使用findViewByID（）查找所有视图的视图，buttonSetup（）是我用onClickListeners设置所有按钮的地方，以及我用setTypeface，setBackground（）等准备视图的地方。现在，当我尝试修改视图时，调用buttonSetup（）时发生崩溃（这只有在我旋转屏幕时才会发生）

这是我正在获取的新日志

01-10 15:06:25.714  16847-16847/com.doublep.wakey E/AndroidRuntime﹕ FATAL EXCEPTION: main
    Process: com.doublep.wakey, PID: 16847
    java.lang.RuntimeException: Unable to start activity ComponentInfo{com.doublep.wakey/com.doublep.wakey.Bulb}: java.lang.NullPointerException
            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2215)
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2265)
            at android.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:3758)
            at android.app.ActivityThread.access$900(ActivityThread.java:145)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1212)
            at android.os.Handler.dispatchMessage(Handler.java:102)
            at android.os.Looper.loop(Looper.java:136)
            at android.app.ActivityThread.main(ActivityThread.java:5081)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:515)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:781)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
            at dalvik.system.NativeStart.main(Native Method)
     Caused by: java.lang.NullPointerException
            at com.doublep.wakey.Bulb.buttonSetup(Bulb.java:604)
            at com.doublep.wakey.Bulb$PremiumFragment.onViewCreated(Bulb.java:1417)
            at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:941)
            at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1104)
            at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1086)
            at android.support.v4.app.FragmentManagerImpl.dispatchActivityCreated(FragmentManager.java:1884)
            at android.support.v4.app.FragmentActivity.onStart(FragmentActivity.java:566)
            at com.doublep.wakey.Bulb.onStart(Bulb.java:1015)
            at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1171)
            at android.app.Activity.performStart(Activity.java:5241)
            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2178)
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2265)
            at android.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:3758)
            at android.app.ActivityThread.access$900(ActivityThread.java:145)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1212)
            at android.os.Handler.dispatchMessage(Handler.java:102)
            at android.os.Looper.loop(Looper.java:136)
            at android.app.ActivityThread.main(ActivityThread.java:5081)
            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:781)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
            at dalvik.system.NativeStart.main(Native Method)

第1417行是buttonSetup（），第604行是buttonSetup（）方法的第一行，我改变了视图的背景

Answer 1

检查Activity lifecycle，您会看到onResume()是首选方法。

此外，每个Fragment都需要一个没有参数的默认公共构造函数。

Answer 2

您的片段似乎是嵌套的内部类在static和public之间添加class关键字。

Answer 3

我找到了一个解决方案，我正在使用本地broadcastReceiver，我正在从onViewCreated（）发送消息，然后我从广播接收器运行我的方法，我不知道它是否是理想的解决方案，但它的工作原理现在

正确填充寻呼机

3 个答案: