我正在使用 Pager 和兼容性库构建一个应用程序。
每当我尝试暂停应用程序时(例如,当我回到桌面时),我的应用程序都会强制关闭。
我从未遇到过此类错误,因此我不知道如何解决它。
我将向您展示我的代码,而我确信您不必查看它:
public class *** extends FragmentActivity {
/** Called when the activity is first created. */
static final int NUM_ITEMS = 5;
static final int NUM_ACTUALITE = 0;
static final int NUM_SELECTION = 1;
static final int NUM_MULTIMEDIA = 2;
static final int NUM_FESTIVALIER = 3;
static final int NUM_***E = 4;
MyAdapter mAdapter;
ViewPager mPager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.pager_layout);
mAdapter = new MyAdapter(getSupportFragmentManager());
mPager = (ViewPager) findViewById(R.id.pager);
mPager.setAdapter(mAdapter);
}
public static class MyAdapter extends FragmentPagerAdapter {
public MyAdapter(FragmentManager fm) {
super(fm);
}
@Override
public int getCount() {
return NUM_ITEMS;
}
@Override
public Fragment getItem(int position) {
switch (position) {
case NUM_ACTUALITE:
return ActuFragment.newInstance();
case NUM_SELECTION:
return SelectionFragment.newInstance();
case NUM_MULTIMEDIA:
return MultimediaFragment.newInstance();
case NUM_FESTIVALIER:
return FestivalierFragment.newInstance();
case NUM_***E:
return ***eFragment.newInstance();
default:
return ActuFragment.newInstance();
}
}
}
和我的 logCat :
02-15 11:48:03.902: E/AndroidRuntime(11601): FATAL EXCEPTION: main
02-15 11:48:03.902: E/AndroidRuntime(11601): java.lang.RuntimeException: Unable to pause activity {com.**.**/com.**.**.***Activity}: java.lang.NullPointerException
02-15 11:48:03.902: E/AndroidRuntime(11601): at android.app.ActivityThread.performPauseActivity(ActivityThread.java:2354)
02-15 11:48:03.902: E/AndroidRuntime(11601): at android.app.ActivityThread.performPauseActivity(ActivityThread.java:2311)
02-15 11:48:03.902: E/AndroidRuntime(11601): at android.app.ActivityThread.handlePauseActivity(ActivityThread.java:2291)
02-15 11:48:03.902: E/AndroidRuntime(11601): at android.app.ActivityThread.access$1700(ActivityThread.java:117)
02-15 11:48:03.902: E/AndroidRuntime(11601): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:938)
02-15 11:48:03.902: E/AndroidRuntime(11601): at android.os.Handler.dispatchMessage(Handler.java:99)
02-15 11:48:03.902: E/AndroidRuntime(11601): at android.os.Looper.loop(Looper.java:130)
02-15 11:48:03.902: E/AndroidRuntime(11601): at android.app.ActivityThread.main(ActivityThread.java:3683)
02-15 11:48:03.902: E/AndroidRuntime(11601): at java.lang.reflect.Method.invokeNative(Native Method)
02-15 11:48:03.902: E/AndroidRuntime(11601): at java.lang.reflect.Method.invoke(Method.java:507)
02-15 11:48:03.902: E/AndroidRuntime(11601): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
02-15 11:48:03.902: E/AndroidRuntime(11601): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
02-15 11:48:03.902: E/AndroidRuntime(11601): at dalvik.system.NativeStart.main(Native Method)
02-15 11:48:03.902: E/AndroidRuntime(11601): Caused by: java.lang.NullPointerException
02-15 11:48:03.902: E/AndroidRuntime(11601): at android.support.v4.app.FragmentManagerImpl.saveFragmentBasicState(FragmentManager.java:1576)
02-15 11:48:03.902: E/AndroidRuntime(11601): at android.support.v4.app.FragmentManagerImpl.saveAllState(FragmentManager.java:1617)
02-15 11:48:03.902: E/AndroidRuntime(11601): at android.support.v4.app.FragmentActivity.onSaveInstanceState(FragmentActivity.java:481)
02-15 11:48:03.902: E/AndroidRuntime(11601): at android.app.Activity.performSaveInstanceState(Activity.java:1037)
02-15 11:48:03.902: E/AndroidRuntime(11601): at android.app.Instrumentation.callActivityOnSaveInstanceState(Instrumentation.java:1181)
02-15 11:48:03.902: E/AndroidRuntime(11601): at android.app.ActivityThread.performPauseActivity(ActivityThread.java:2336)
02-15 11:48:03.902: E/AndroidRuntime(11601): ... 12 more
地雷碎片:
public class ActuFragment extends Fragment {
public static ActuFragment newInstance() {
ActuFragment f = new ActuFragment();
return f;
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View mainView = inflater.inflate(R.layout.actualites_layout,
container, false);
return mainView;
}
}
我在使用 ActionBarSherlock 兼容性库时偶然发现了同样的问题。解决方法是您的适配器扩展FragmentStatePagerAdapter
代替FragmentPagerAdapter
.
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