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

Andre Colares
Andre Colares
5,437 Points

DROID YOU ARE LOOKING FOR - CODE FOR THIS VIDEO

After a lot of googling and reading other questions here in the forum, I solved all my errors and now is working. Here is the code for all files:

SECTIONSPAGEADAPTER:

package com.andrecolares.ribbit;

/**

  • Created by Andre on 14/10/2015. */ import android.content.Context; import android.support.v4.app.Fragment; import android.support.v4.app.FragmentManager; import android.support.v4.app.FragmentPagerAdapter;

import java.util.Locale;

/**

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

    // In the lesson, we factor this code out of MainActivity.class, and thus must add the context // as a member variable that gets passed in through the constructor. Nothing about this // will change from the video, no deprecation involved, no Android Studio conflicts.

    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 new InboxFragment();
    

    }

    @Override public int getCount() { // In the video we reduce this boilerplate value from 3 // to 2 tabs, one for Inbox and one for Friends. Again, no // change needed from the video, follow along. // Show 2 total pages. return 2; }

    @Override public CharSequence getPageTitle(int position) { Locale l = Locale.getDefault(); // this is where we'll pass the context to variables that are now // outside the scope of MainActivity.class after the refactor. // again, nothing different than the video, follow the video. // Remember to delete the third case in the boilerplate code // and change the strings resources entries to Inbox and // Friends, respectively, just like in the video. 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; } }

MAIN ACTIVITY:

package com.andrecolares.ribbit;

import android.content.Intent; import android.os.Bundle; import android.support.v4.app.Fragment; import android.support.v4.app.FragmentPagerAdapter; import android.support.v4.view.ViewPager; import android.support.v7.app.ActionBar; import android.support.v7.app.ActionBarActivity; import android.util.Log; import android.view.LayoutInflater; import android.view.Menu; import android.view.MenuItem; import android.view.View; import android.view.ViewGroup;

import com.parse.ParseUser;

// The TabListener has been deprecated, will look for update later // **The MainActivity class is implementing TabListener, so the ** // *** activity itself is listening for tab changes. We'll have to *** // *** replace this later. Remember that TabListener is an interface,*** // *** so we'll be looking for a replacement interface later. *** public class MainActivity extends ActionBarActivity {

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);

    // Get the user cached on disk if present
    ParseUser currentUser = ParseUser.getCurrentUser();

    if (currentUser == null) {
        // If no one is logged in, go to the login screen
        navigateToLogin();
    } else {
        Log.i(TAG, currentUser.getUsername());
    }


    // Set up the action bar.
    final ActionBar actionBar = getSupportActionBar();

    // ***This is where setNavigationMode has been deprecated***


    // 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);
}



@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
    switch (id) {

        case R.id.action_logout:
            ParseUser.logOut();
            navigateToLogin();
            break;
    }
    return super.onOptionsItemSelected(item);
}


private void navigateToLogin() {
    Intent intent = new Intent(MainActivity.this, LoginActivity.class);
    intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
    intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK);
    startActivity(intent);
}






/**
 * A placeholder fragment containing a simple view.
 * This is referred to as "DummySectionFragment" in the
 * lesson.
 */
public static class PlaceholderFragment extends Fragment {
    /**
     * The fragment argument representing the section number for this
     * fragment.
     */
    private static final String ARG_SECTION_NUMBER = "section_number";

    public PlaceholderFragment() {
    }

    /**
     * Returns a new instance of this fragment for the given section
     * number.
     */
    public static PlaceholderFragment newInstance(int sectionNumber) {
        PlaceholderFragment fragment = new PlaceholderFragment();
        Bundle args = new Bundle();
        args.putInt(ARG_SECTION_NUMBER, sectionNumber);
        fragment.setArguments(args);
        return fragment;
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.fragment_main, container, false);
        return rootView;
    }
}

INBOX FRAGMENT:

package com.andrecolares.ribbit;

import android.os.Bundle; import android.support.v4.app.ListFragment; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup;

// Inbox will be a list of messages public class InboxFragment extends ListFragment{

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    View rootView = inflater.inflate(R.layout.fragment_inbox, container,
            false);

    return rootView;
}

}

INBOX LAYOUT: <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="match_parent" android:layout_height="match_parent" >

<TextView
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:id="@+id/empty"
    android:text="@string/empty_inbox_label"/>

<ListView
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@android:id/list"
    android:layout_alignParentLeft="true"
    android:layout_alignParentTop="true"/>

</LinearLayout>

FRIENDS FRAGMENT:

package com.andrecolares.ribbit;

import android.os.Bundle; import android.support.v4.app.ListFragment; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup;

// Inbox will be a list of messages public class FriendsFragment extends ListFragment{

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    View rootView = inflater.inflate(R.layout.fragment_friends, container,
            false);

    return rootView;
}

}

FRIENDS LAYOUT:

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="match_parent" android:layout_height="match_parent" >

<TextView
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:id="@+id/empty"
    android:text="@string/empty_friends_label"/>

<ListView
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@android:id/list"
    android:layout_alignParentLeft="true"
    android:layout_alignParentTop="true"/>

</LinearLayout>

STRINGS VALUES:

<resources> <string name="app_name">Ribbit</string>

<string name="title_section1">Inbox</string>
<string name="title_section2">Friends</string>

<string name="hello_world">Hello world!</string>

<string name="action_settings">Settings</string>
<string name="title_activity_login">LoginActivity</string>
<string name="username_hint">Username</string>
<string name="password_hint">Password</string>
<string name="login_button_label">Login</string>
<string name="sign_up_text">Sign Up!</string>
<string name="title_activity_sign_up">SignUpActivity</string>
<string name="email_hint">Email</string>
<string name="sign_up_button_label">Sign Up</string>
<string name="signup_error_message">Please make sure you enter a username, password and email address!</string>
<string name="signup_error_title">Oops!</string>
<string name="login_error_message">Please make sure you enter a username and password!</string>
<string name="login_error_title">Oops!</string>
<string name="menu_logout_label">Logout</string>
<string name="empty_inbox_label">No new messages!</string>
<string name="empty_friends_label">Add friends to begin!</string>

</resources>

1 Answer

Andre Colares
Andre Colares
5,437 Points

If someone else wants some help at this point of the code , I can help... Thumbs up if it saved you time!