When I use home button or switch to landscape I catch the runtime exception: Unable to pause activity. NullPointerException. Help please.
01-14 09:23:49.435: E/AndroidRuntime(331): FATAL EXCEPTION: main 01-14 09:23:49.435: E/AndroidRuntime(331): java.lang.RuntimeException: Unable to pause activity {com.example.actiontest/com.example.actiontest.MainActivity}: java.lang.NullPointerException 01-14 09:23:49.435: E/AndroidRuntime(331): at android.app.ActivityThread.performPauseActivity(ActivityThread.java:2354) 01-14 09:23:49.435: E/AndroidRuntime(331): at android.app.ActivityThread.performPauseActivity(ActivityThread.java:2311) 01-14 09:23:49.435: E/AndroidRuntime(331): at android.app.ActivityThread.handlePauseActivity(ActivityThread.java:2291) 01-14 09:23:49.435: E/AndroidRuntime(331): at android.app.ActivityThread.access$1700(ActivityThread.java:117) 01-14 09:23:49.435: E/AndroidRuntime(331): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:938) 01-14 09:23:49.435: E/AndroidRuntime(331): at android.os.Handler.dispatchMessage(Handler.java:99) 01-14 09:23:49.435: E/AndroidRuntime(331): at android.os.Looper.loop(Looper.java:123) 01-14 09:23:49.435: E/AndroidRuntime(331): at android.app.ActivityThread.main(ActivityThread.java:3683) 01-14 09:23:49.435: E/AndroidRuntime(331): at java.lang.reflect.Method.invokeNative(Native Method) 01-14 09:23:49.435: E/AndroidRuntime(331): at java.lang.reflect.Method.invoke(Method.java:507) 01-14 09:23:49.435: E/AndroidRuntime(331): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839) 01-14 09:23:49.435: E/AndroidRuntime(331): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597) 01-14 09:23:49.435: E/AndroidRuntime(331): at dalvik.system.NativeStart.main(Native Method) 01-14 09:23:49.435: E/AndroidRuntime(331): Caused by: java.lang.NullPointerException 01-14 09:23:49.435: E/AndroidRuntime(331): at android.support.v4.app.FragmentManagerImpl.saveFragmentBasicState(FragmentManager.java:1576) 01-14 09:23:49.435: E/AndroidRuntime(331): at android.support.v4.app.FragmentManagerImpl.saveAllState(FragmentManager.java:1617) 01-14 09:23:49.435: E/AndroidRuntime(331): at android.support.v4.app.FragmentActivity.onSaveInstanceState(FragmentActivity.java:481) 01-14 09:23:49.435: E/AndroidRuntime(331): at com.actionbarsherlock.app.SherlockFragmentActivity.onSaveInstanceState(SherlockFragmentActivity.java:126) 01-14 09:23:49.435: E/AndroidRuntime(331): at android.app.Activity.performSaveInstanceState(Activity.java:1037) 01-14 09:23:49.435: E/AndroidRuntime(331): at android.app.Instrumentation.callActivityOnSaveInstanceState(Instrumentation.java:1181) 01-14 09:23:49.435: E/AndroidRuntime(331): at android.app.ActivityThread.performPauseActivity(ActivityThread.java:2336) 01-14 09:23:49.435: E/AndroidRuntime(331): ... 12 more
MainActivity.java
package com.example.actiontest;
import android.os.Bundle;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.support.v4.view.ViewPager;
import com.actionbarsherlock.app.ActionBar;
import com.actionbarsherlock.app.ActionBar.Tab;
import com.actionbarsherlock.app.SherlockFragmentActivity;
public class MainActivity extends SherlockFragmentActivity
implements ActionBar.TabListener {
private ViewPager viewPager;
private TabsPagerAdapter mAdapter;
private ActionBar actionBar;
// Tab titles
private String[] tabs = { "Top Rated", "Games", "Movies" };
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Initilization
actionBar = getSupportActionBar();
viewPager = (ViewPager) findViewById(R.id.pager);
mAdapter = new TabsPagerAdapter(getSupportFragmentManager());
viewPager.setAdapter(mAdapter);
//actionBar.setHomeButtonEnabled(false);
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
// Adding Tabs
for (String tab_name : tabs) {
actionBar.addTab(actionBar.newTab().setText(tab_name)
.setTabListener(this));
}
/**
* on swiping the viewpager make respective tab selected
* */
viewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
@Override
public void onPageSelected(int position) {
// on changing the page
// make respected tab selected
actionBar.setSelectedNavigationItem(position);
}
@Override
public void onPageScrolled(int arg0, float arg1, int arg2) {
}
@Override
public void onPageScrollStateChanged(int arg0) {
}
});
}
@Override
public void onTabReselected(Tab tab, FragmentTransaction transaction) {
}
@Override
public void onTabSelected(Tab tab, FragmentTransaction transaction) {
//mSelected.setText("Selected: " + tab.getText());
viewPager.setCurrentItem(tab.getPosition());
}
@Override
public void onTabUnselected(Tab tab, FragmentTransaction transaction) {
}
}
TabsPagerAdapter.java
package com.example.actiontest;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
public class TabsPagerAdapter extends FragmentPagerAdapter {
public TabsPagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int index) {
switch (index) {
case 0:
// Top Rated fragment activity
return new TopRatedFragment();
case 1:
// Top Rated fragment activity
return new TopRatedFragment();
case 2:
// Top Rated fragment activity
return new TopRatedFragment();
}
return null;
}
@Override
public int getCount() {
// get item count - equal to number of tabs
return 3;
}
}
TopRatedFragment.java
package com.example.actiontest;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import com.actionbarsherlock.app.SherlockFragment;
public class TopRatedFragment extends SherlockFragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_top_rated, container, false);
return rootView;
}
}
Make your TabsPagerAdapter extend FragmentStatePagerAdapter instead of FragmentPagerAdapter and you are good to go.