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Android Build a Self-Destructing Message Android App Using Fragments for Tabs Modifying Fragments from the Template

Leon Mathis
Leon Mathis
23,404 Points

NAVIGATION_MODE_TABS are deprecated on MainActivity and errors STILL on SectionPagerAdapter.java on returnFragment

After doing the video twice and following all other forum questions. It seems I can't fix this bug.

Issue 1 After MainActivity extends FragmentActivity it brings up an error on final ActionBar actionBar = getSupportActionBar(); actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);

getSupportActionBar is highleted red and the rest of the code is crossed out. Also changed "getSupportActionBar" to "getActionBar". Still error.

Issue 2 After following all other questions and links, 'return new InboxFragment();' and Frinds brings up an error. Says android.support.v4.app.Fragment; is required but it imported on all tabs.

What am I doing wrong?

p.s. cleaned and rebuilt project

Leon Mathis
Leon Mathis
23,404 Points
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.app.FragmentTransaction;
import android.support.v4.view.ViewPager;
import android.support.v7.app.ActionBar;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;

import com.parse.ParseAnalytics;
import com.parse.ParseUser;


public class MainActivity extends FragmentActivity implements ActionBar.TabListener {

    public static final String TAG = MainActivity.class.getSimpleName();

    /**
     * The {@link android.support.v4.view.PagerAdapter} that will provide
     * fragments for each of the sections. We use a
     * {@link FragmentPagerAdapter} derivative, which will keep every
     * loaded fragment in memory. If this becomes too memory intensive, it
     * may be best to switch to a
     * {@link android.support.v4.app.FragmentStatePagerAdapter}.
     */
    SectionsPagerAdapter mSectionsPagerAdapter;

    /**
     * The {@link ViewPager} that will host the section contents.
     */
    ViewPager mViewPager;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        ParseAnalytics.trackAppOpenedInBackground(getIntent());// tracking for Parse

        ParseUser currentUser =ParseUser.getCurrentUser();
        if (currentUser == null) {

            //start login activity
            navigateToLogin();
        }
        else {
            Log.i(TAG, currentUser.getUsername());
        }

        // Set up the action bar.
        final ActionBar actionBar = getSupportActionBar();
        actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS); //this line is crossed out

        // Create the adapter that will return a fragment for each of the three
        // primary sections of the activity.
        mSectionsPagerAdapter = new SectionsPagerAdapter(this,getSupportFragmentManager());

        // Set up the ViewPager with the sections adapter.
        mViewPager = (ViewPager) findViewById(R.id.pager);
        mViewPager.setAdapter(mSectionsPagerAdapter);

        // When swiping between different sections, select the corresponding
        // tab. We can also use ActionBar.Tab#select() to do this if we have
        // a reference to the Tab.
        mViewPager.setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() {
            @Override
            public void onPageSelected(int position) {
                actionBar.setSelectedNavigationItem(position);
            }
        });

        // For each of the sections in the app, add a tab to the action bar.
        for (int i = 0; i < mSectionsPagerAdapter.getCount(); i++) {
            // Create a tab with text corresponding to the page title defined by
            // the adapter. Also specify this Activity object, which implements
            // the TabListener interface, as the callback (listener) for when
            // this tab is selected.
            actionBar.addTab(
                    actionBar.newTab()
                            .setText(mSectionsPagerAdapter.getPageTitle(i))
                            .setTabListener(this));
        }


    }

    private void navigateToLogin() {
        Intent intent = new Intent(this, com.comapany.ribbit.LoginActivity.class);
        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK); // login is a new task
        intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK);// clear the previous screen for the 'back button' in short, exits the app
        startActivity(intent);
    }


    @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 itemid = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (itemid == R.id.action_logout) {
            ParseUser.logOut();
            navigateToLogin();
            //return true;
        }

        return super.onOptionsItemSelected(item);
    }

    @Override
    public void onTabSelected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) {
        // When the given tab is selected, switch to the corresponding page in
        // the ViewPager.
        mViewPager.setCurrentItem(tab.getPosition());
    }

    @Override
    public void onTabUnselected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) {
    }

    @Override
    public void onTabReselected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) {
    }

}
Leon Mathis
Leon Mathis
23,404 Points
import java.util.Locale;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.content.Context;


import java.util.Locale;

/**
 * A {@link FragmentPagerAdapter} that returns a fragment corresponding to
 * one of the sections/tabs/pages.
 */
public class SectionsPagerAdapter extends FragmentPagerAdapter {

    protected Context mContext;

    public SectionsPagerAdapter(Context context, FragmentManager fm) {
        super(fm);
        mContext = context;
    }

    @Override
    public Fragment getItem(int position) {
        // getItem is called to instantiate the fragment for the given page.
        // Return a PlaceholderFragment (defined as a static inner class
        // below).
        switch(position) {
            case 0:
                return new InboxFragment();
            case 1:
                return new FriendsFragment();
        }
        return null;
    }

    @Override
    public int getCount() {
        // Show 2 total pages.
        return 2;
    }

    @Override
    public CharSequence getPageTitle(int position) {
        Locale l = Locale.getDefault();
        switch (position) {
            case 0:
                return mContext.getString(R.string.title_section1).toUpperCase(l);
            case 1:
                return mContext.getString(R.string.title_section2).toUpperCase(l);
        }
        return null;
    }
}

1 Answer

Leon Mathis
Leon Mathis
23,404 Points

SOLVED! After some research, I had the MainActivity extends ActionBarActivity. Also fixed my Fragemnt.java issues.

public class MainActivity extends ActionBarActivity implements ActionBar.TabListener {

...as you were. :)

p.s. That feeling you get when you keep pushing forward and don't give up.