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나는 안드로이드 스 와이프 탭을 사용하려고합니다. 탭이 올바르게 표시됩니다. 이제 스 와이프 또는 탭을 클릭하여보기를 변경하려고하면 예외가 발생합니다. 내가 YouTube 튜토리얼처럼 똑같은 방식으로했기 때문에 내 실수를 모르겠다. 내 메인 클래스 그게 전부안드로이드 스 와이프 탭을 사용하여 치명적인 예외
03-31 13:25:06.173: E/AndroidRuntime(1941): FATAL EXCEPTION: main
03-31 13:25:06.173: E/AndroidRuntime(1941): java.lang.NullPointerException
03-31 13:25:06.173: E/AndroidRuntime(1941): at de.basti12354.uebungen.Liegestuetzen$1.onPageSelected(Liegestuetzen.java:42)
03-31 13:25:06.173: E/AndroidRuntime(1941): at android.support.v4.view.ViewPager.scrollToItem(ViewPager.java:567)
03-31 13:25:06.173: E/AndroidRuntime(1941): at android.support.v4.view.ViewPager.setCurrentItemInternal(ViewPager.java:551)
03-31 13:25:06.173: E/AndroidRuntime(1941): at android.support.v4.view.ViewPager.onTouchEvent(ViewPager.java:2015)
03-31 13:25:06.173: E/AndroidRuntime(1941): at android.view.View.dispatchTouchEvent(View.java:7384)
03-31 13:25:06.173: E/AndroidRuntime(1941): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2205)
03-31 13:25:06.173: E/AndroidRuntime(1941): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1940)
03-31 13:25:06.173: E/AndroidRuntime(1941): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2211)
03-31 13:25:06.173: E/AndroidRuntime(1941): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1954)
03-31 13:25:06.173: E/AndroidRuntime(1941): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2211)
03-31 13:25:06.173: E/AndroidRuntime(1941): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1954)
03-31 13:25:06.173: E/AndroidRuntime(1941): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2211)
03-31 13:25:06.173: E/AndroidRuntime(1941): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1954)
03-31 13:25:06.173: E/AndroidRuntime(1941): at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:1966)
03-31 13:25:06.173: E/AndroidRuntime(1941): at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1418)
03-31 13:25:06.173: E/AndroidRuntime(1941): at android.app.Activity.dispatchTouchEvent(Activity.java:2424)
03-31 13:25:06.173: E/AndroidRuntime(1941): at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:1914)
03-31 13:25:06.173: E/AndroidRuntime(1941): at android.view.View.dispatchPointerEvent(View.java:7564)
03-31 13:25:06.173: E/AndroidRuntime(1941): at android.view.ViewRootImpl$ViewPostImeInputStage.processPointerEvent(ViewRootImpl.java:3883)
03-31 13:25:06.173: E/AndroidRuntime(1941): at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:3778)
03-31 13:25:06.173: E/AndroidRuntime(1941): at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3379)
03-31 13:25:06.173: E/AndroidRuntime(1941): at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3429)
03-31 13:25:06.173: E/AndroidRuntime(1941): at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3398)
03-31 13:25:06.173: E/AndroidRuntime(1941): at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:3483)
03-31 13:25:06.173: E/AndroidRuntime(1941): at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3406)
03-31 13:25:06.173: E/AndroidRuntime(1941): at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:3540)
03-31 13:25:06.173: E/AndroidRuntime(1941): at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3379)
03-31 13:25:06.173: E/AndroidRuntime(1941): at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3429)
03-31 13:25:06.173: E/AndroidRuntime(1941): at android.view.ViewRootImpl.enqueueInputEvent(ViewRootImpl.java:5370)
03-31 13:25:06.173: E/AndroidRuntime(1941): at android.view.ViewRootImpl$WindowInputEventReceiver.onInputEvent(ViewRootImpl.java:5493)
03-31 13:25:06.173: E/AndroidRuntime(1941): at android.view.InputEventReceiver.dispatchInputEvent(InputEventReceiver.java:182)
03-31 13:25:06.173: E/AndroidRuntime(1941): at android.os.MessageQueue.nativePollOnce(Native Method)
03-31 13:25:06.173: E/AndroidRuntime(1941): at android.os.MessageQueue.next(MessageQueue.java:132)
03-31 13:25:06.173: E/AndroidRuntime(1941): at android.os.Looper.loop(Looper.java:124)
03-31 13:25:06.173: E/AndroidRuntime(1941): at android.app.ActivityThread.main(ActivityThread.java:5103)
03-31 13:25:06.173: E/AndroidRuntime(1941): at java.lang.reflect.Method.invokeNative(Native Method)
03-31 13:25:06.173: E/AndroidRuntime(1941): at java.lang.reflect.Method.invoke(Method.java:525)
03-31 13:25:06.173: E/AndroidRuntime(1941): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
03-31 13:25:06.173: E/AndroidRuntime(1941): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
03-31 13:25:06.173: E/AndroidRuntime(1941): at dalvik.system.NativeStart.main(Native Method)
:
public class Liegestuetzen extends FragmentActivity implements TabListener {
ActionBar actionBar;
ViewPager pager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main_liege);
pager = (ViewPager) findViewById(R.id.viewPager);
pager.setAdapter(new MyPagerAdapter(getSupportFragmentManager()));
pager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
@Override
public void onPageSelected(int pos) {
// TODO Auto-generated method stub
actionBar.setSelectedNavigationItem(pos);
}
@Override
public void onPageScrolled(int arg0, float arg1, int arg2) {
// TODO Auto-generated method stub
}
@Override
public void onPageScrollStateChanged(int arg0) {
// TODO Auto-generated method stub
}
});
//actionbar
ActionBar actionBar= getActionBar();
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
ActionBar.Tab tab1=actionBar.newTab();
ActionBar.Tab tab2=actionBar.newTab();
tab1.setText("Tab 1");
tab2.setText("Tab 2");
tab1.setTabListener(this);
tab2.setTabListener(this);
actionBar.addTab(tab1);
actionBar.addTab(tab2);
}
@Override
public void onTabSelected(Tab tab, FragmentTransaction ft) {
// TODO Auto-generated method stub
pager.setCurrentItem(tab.getPosition());
}
@Override
public void onTabUnselected(Tab tab, FragmentTransaction ft) {
// TODO Auto-generated method stub
}
@Override
public void onTabReselected(Tab tab, FragmentTransaction ft) {
// TODO Auto-generated method stub
}
public class MyPagerAdapter extends FragmentPagerAdapter {
public MyPagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int pos) {
switch(pos) {
case 0: return new Liege1();
case 1: return new Liege2();
//case 2: return new ThirdFragment();
}
return null;
}
@Override
public int getCount() {
return 2;
}
} }
내 fragment1 그게 전부는 :
public class Liege1 extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.liegestuetzen, container, false);
return rootView;
}
}