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- public class MainActivity extends ActionBarActivity {
- private Toolbar toolbar;
- private ViewPager pager;
- private SlidingTabLayout nLayout;
- @Override
- protected void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- setContentView(R.layout.activity_main_appbar);
- toolbar = (Toolbar) findViewById(R.id.app_bar);
- setSupportActionBar(toolbar);
- getSupportActionBar().setDisplayShowHomeEnabled(true);
- NavigationDrawerFragment drawerFragment = (NavigationDrawerFragment)
- getSupportFragmentManager().findFragmentById(R.id.navigation_drawer_fragment);
- drawerFragment.setUp(R.id.navigation_drawer_fragment, (DrawerLayout) findViewById(R.id.drawer_layout), toolbar);
- pager = (ViewPager) findViewById(R.id.pager);
- pager.setAdapter(new MyPagerAdapter(getSupportFragmentManager()));
- nLayout = (SlidingTabLayout) findViewById(R.id.tabs);
- nLayout.setViewPager(pager);
- }
- @Override
- public boolean onCreateOptionsMenu(Menu menu) {
- // Inflate the menu; this adds items to the action bar if it is present.
- getMenuInflater().inflate(R.menu.menu_main, menu);
- return true;
- }
- @Override
- public boolean onOptionsItemSelected(MenuItem item) {
- // Handle action bar item clicks here. The action bar will
- // automatically handle clicks on the Home/Up button, so long
- // as you specify a parent activity in AndroidManifest.xml.
- int id = item.getItemId();
- //noinspection SimplifiableIfStatement
- if (id == R.id.action_settings) {
- return true;
- }
- if (id == R.id.navigate) {
- startActivity(new Intent(this, SubActivity.class));
- }
- return super.onOptionsItemSelected(item);
- }
- class MyPagerAdapter extends FragmentPagerAdapter {
- String tabs[];
- public MyPagerAdapter(FragmentManager fm) {
- super(fm);
- tabs = getResources().getStringArray(R.array.tabs);
- }
- @Override
- public Fragment getItem(int position) {
- MyFragment myFragment = MyFragment.getInstance(position);
- return myFragment;
- }
- @Override
- public CharSequence getPageTitle(int position) {
- return tabs[position];
- }
- @Override
- public int getCount() {
- return 3;
- }
- }
- public static class MyFragment extends Fragment {
- private TextView textView;
- public static MyFragment getInstance(int position) {
- MyFragment myFragment = new MyFragment();
- Bundle args = new Bundle();
- args.putInt("position", position);
- myFragment.setArguments(args);
- return myFragment;
- }
- @Nullable
- @Override
- public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
- View layout = inflater.inflate(R.layout.fragment_my, container, false);
- textView = (TextView) layout.findViewById(R.id.position);
- Bundle bundle = getArguments();
- if (bundle != null) {
- textView.setText("The page selected is " + bundle.getInt("position"));
- }
- return layout;
- }
- }
- }
- <LinearLayout
- android:layout_width="match_parent"
- android:layout_height="match_parent"
- android:orientation="vertical"
- tools:context="carsaleapp.shanaka.com.carsaleapp.MainActivity">
- <include
- android:id="@+id/app_bar"
- layout="@layout/app_bar" />
- <app.shanaka.tabs.SlidingTabLayout
- android:id="@+id/tabs"
- android:layout_width="match_parent"
- android:layout_height="wrap_content" />
- <android.support.v4.view.ViewPager
- android:id="@+id/pager"
- android:layout_width="match_parent"
- android:layout_height="0dp"
- android:layout_weight="1" />
- </LinearLayout>
- java.lang.RuntimeException: Unable to start activity ComponentInfo{carsaleapp.shanaka.com.carsaleapp/carsaleapp.shanaka.com.carsaleapp.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.support.v4.view.ViewPager.setAdapter(android.support.v4.view.PagerAdapter)' on a null object reference
- at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2298)
- at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2360)
- at android.app.ActivityThread.access$800(ActivityThread.java:144)
- at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1278)
- at android.os.Handler.dispatchMessage(Handler.java:102)
- at android.os.Looper.loop(Looper.java:135)
- at android.app.ActivityThread.main(ActivityThread.java:5221)
- at java.lang.reflect.Method.invoke(Native Method)
- at java.lang.reflect.Method.invoke(Method.java:372)
- at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
- at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
- Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.support.v4.view.ViewPager.setAdapter(android.support.v4.view.PagerAdapter)' on a null object reference
- at carsaleapp.shanaka.com.carsaleapp.MainActivity.onCreate(MainActivity.java:42)
- at android.app.Activity.performCreate(Activity.java:5933)
- at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1105)
- at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2251)
- at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2360)
- at android.app.ActivityThread.access$800(ActivityThread.java:144)
- at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1278)
- at android.os.Handler.dispatchMessage(Handler.java:102)
- at android.os.Looper.loop(Looper.java:135)
- at android.app.ActivityThread.main(ActivityThread.java:5221)
- at java.lang.reflect.Method.invoke(Native Method)
- at java.lang.reflect.Method.invoke(Method.java:372)
- at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
- at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
- pager = (ViewPager) findViewById(R.id.pager);
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