wilsonchama 0 Light Poster

Hi Guys,

Am trying to develop an android application with 13 fragments. The app works very well with the navigation drawer, but when I tried to add the code for the function to swipe the screen to switch betwenn fragments, the app stopped to work. I am very new to android development, the reason why I am failing to get to the root of the matter. I need your help guys.

Thanks in advance.

Here is the code for main Main Activity.java

package com.aidforpcs.www.myfragmentexample;

import android.content.Context;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v4.widget.DrawerLayout;

import android.support.v7.app.ActionBar;
import android.support.v7.app.ActionBarActivity;
import android.support.v7.app.ActionBarDrawerToggle;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.Toolbar;
import android.text.Layout;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Adapter;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.LinearLayout;
import android.widget.ListView;

import java.util.ArrayList;

@SuppressWarnings("ALL")
public class MainActivity extends ActionBarActivity implements AdapterView.OnItemClickListener {

    //Viewpager declaration
    private ViewPager viewPager;

// The statements below pertain to the navigation drawer declarations
    private ActionBarDrawerToggle actionBarDrawerToggle;
    private DrawerLayout drawerLayout;
    private ListView navList;
    private ActionBar actionBar;
    private FragmentTransaction fragmentTransaction;
    private FragmentManager fragmentManager;

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

//These statements makes the navigation drawer functional
        drawerLayout = (DrawerLayout) findViewById(R.id.drawerlayout);
        navList = (ListView) findViewById(R.id.navList);
        ArrayList<String> navArray = new ArrayList<>();
        navArray.add("Home");
        navArray.add("Chapter 1");
        navArray.add("Chapter 2");
        navArray.add("Chapter 3");
        navArray.add("Chapter 4");
        navArray.add("Chapter 5");
        navArray.add("Chapter 6");
        navArray.add("Chapter 7");
        navArray.add("Chapter 8");
        navArray.add("Chapter 9");
        navArray.add("Chapter 10");
        navArray.add("Chapter 11");
        navArray.add("Chapter 12");

        ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_activated_1, navArray);
        navList.setAdapter(adapter);
        navList.setOnItemClickListener(this);
        navList.setChoiceMode(ListView.CHOICE_MODE_SINGLE);
        actionBarDrawerToggle = new ActionBarDrawerToggle(this, drawerLayout, R.string.openedarwer, R.string.closedrawer);
        drawerLayout.setDrawerListener(actionBarDrawerToggle);
        actionBar = getSupportActionBar();
        actionBar.setDisplayHomeAsUpEnabled(true);
        actionBar.setDisplayHomeAsUpEnabled(true);
        fragmentManager = getSupportFragmentManager();
        fragmentTransaction = fragmentManager.beginTransaction();
        loadSelection(0);

        viewPager = (ViewPager) findViewById(R.id.TheViewPager);
        viewPager.setAdapter(new MyAdapter());

    }

//The switch statement displays the fragments associated with the selected integer
    private void loadSelection(int i) {

        navList.setItemChecked(i, true);
        switch (i) {
            case 0:
                Home home = new Home();
                fragmentTransaction = fragmentManager.beginTransaction();
                fragmentTransaction.replace(R.id.fragmentholder, home);
                fragmentTransaction.commit();
                break;
            case 1:
                Chapter1 chapter1 = new Chapter1();
                fragmentTransaction = fragmentManager.beginTransaction();
                fragmentTransaction.replace(R.id.fragmentholder, chapter1);
                fragmentTransaction.commit();
                break;
            case 2:
                Chapter2 chapter2 = new Chapter2();
                fragmentTransaction = fragmentManager.beginTransaction();
                fragmentTransaction.replace(R.id.fragmentholder, chapter2);
                fragmentTransaction.commit();
                break;
            case 3:
                Chapter3 chapter3 = new Chapter3();
                fragmentTransaction = fragmentManager.beginTransaction();
                fragmentTransaction.replace(R.id.fragmentholder, chapter3);
                fragmentTransaction.commit();
                break;
            case 4:
                Chapter4 chapter4 = new Chapter4();
                fragmentTransaction = fragmentManager.beginTransaction();
                fragmentTransaction.replace(R.id.fragmentholder, chapter4);
                fragmentTransaction.commit();
                break;
            case 5:
                Chapter5 chapter5 = new Chapter5();
                fragmentTransaction = fragmentManager.beginTransaction();
                fragmentTransaction.replace(R.id.fragmentholder, chapter5);
                fragmentTransaction.commit();
                break;
            case 6:
                Chapter6 chapter6 = new Chapter6();
                fragmentTransaction = fragmentManager.beginTransaction();
                fragmentTransaction.replace(R.id.fragmentholder, chapter6);
                fragmentTransaction.commit();
                break;

            case 7:
                Chapter7 chapter7 = new Chapter7();
                fragmentTransaction = fragmentManager.beginTransaction();
                fragmentTransaction.replace(R.id.fragmentholder, chapter7);
                fragmentTransaction.commit();
                break;

            case 8:
                Chapter8 chapter8 = new Chapter8();
                fragmentTransaction = fragmentManager.beginTransaction();
                fragmentTransaction.replace(R.id.fragmentholder, chapter8);
                fragmentTransaction.commit();
                break;

            case 9:
                Chapter9 chapter9 = new Chapter9();
                fragmentTransaction = fragmentManager.beginTransaction();
                fragmentTransaction.replace(R.id.fragmentholder, chapter9);
                fragmentTransaction.commit();
                break;

            case 10:
                Chapter10 chapter10 = new Chapter10();
                fragmentTransaction = fragmentManager.beginTransaction();
                fragmentTransaction.replace(R.id.fragmentholder, chapter10);
                fragmentTransaction.commit();
                break;

            case 11:
                Chapter11 chapter11 = new Chapter11();
                fragmentTransaction = fragmentManager.beginTransaction();
                fragmentTransaction.replace(R.id.fragmentholder, chapter11);
                fragmentTransaction.commit();
                break;

            case 12:
                Chapter12 chapter12 = new Chapter12();
                fragmentTransaction = fragmentManager.beginTransaction();
                fragmentTransaction.replace(R.id.fragmentholder, chapter12);
                fragmentTransaction.commit();
                break;

        }
    }

    @Override
    protected void onPostCreate(Bundle SavedInstanceState) {
        super.onPostCreate(SavedInstanceState);
        actionBarDrawerToggle.syncState();
    }

    public boolean onOptionsItemSelected(MenuItem item) {

        int id = item.getItemId();
        {

            if (id == android.R.id.home) ;
            if (drawerLayout.isDrawerOpen(navList)) {
                drawerLayout.closeDrawer(navList);
            } else {
                drawerLayout.openDrawer(navList);
            }
        }
        return super.onOptionsItemSelected(item);
    }

    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
        loadSelection(position);

        drawerLayout.closeDrawer(navList);
    }

    //Code to implement the viewpager functionality

    public class MyAdapter extends PagerAdapter {
        LayoutInflater layoutInflater;
        int[] layouts = {R.layout.fragment_home, R.layout.fragment_chapter1, R.layout.fragment_chapter2,
                R.layout.fragment_chapter3, R.layout.fragment_chapter4,
                R.layout.fragment_chapter5, R.layout.fragment_chapter6,
                R.layout.fragment_chapter7, R.layout.fragment_chapter8,
                R.layout.fragment_chapter9, R.layout.fragment_chapter10,
                R.layout.fragment_chapter11, R.layout.fragment_chapter12};

        @Override
        public int getCount() {
            return layouts.length;
        }

        @Override
        public boolean isViewFromObject(View view, Object object) {
            return (view == (LinearLayout) object);
        }

        @Override
        public Object instantiateItem(ViewGroup container, int position) {
            layoutInflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            View home = layoutInflater.inflate(R.layout.fragment_home, container, false);
            View one = layoutInflater.inflate(R.layout.fragment_chapter1, container, false);
            View two = layoutInflater.inflate(R.layout.fragment_chapter2, container, false);
            View three = layoutInflater.inflate(R.layout.fragment_chapter3, container, false);
            View four = layoutInflater.inflate(R.layout.fragment_chapter4, container, false);
            View five = layoutInflater.inflate(R.layout.fragment_chapter5, container, false);
            View six = layoutInflater.inflate(R.layout.fragment_chapter6, container, false);
            View seven = layoutInflater.inflate(R.layout.fragment_chapter7, container, false);
            View eight = layoutInflater.inflate(R.layout.fragment_chapter8, container, false);
            View nine = layoutInflater.inflate(R.layout.fragment_chapter9, container, false);
            View ten = layoutInflater.inflate(R.layout.fragment_chapter10, container, false);
            View eleven = layoutInflater.inflate(R.layout.fragment_chapter11, container, false);
            View twelve = layoutInflater.inflate(R.layout.fragment_chapter12, container, false);

            View viewarr[] = {home, one, two, three, four, five, six, seven, eight, nine, ten, eleven, twelve};
            container.addView(viewarr[position]);
            return viewarr[position];
        }

        @Override
        public void destroyItem(ViewGroup container, int position, Object object) {
            container.removeView((LinearLayout) object);
        }

    }
}

This code is for the Main Activity.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/drawerlayout"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <FrameLayout
        android:id="@+id/fragmentholder"
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:background="@drawable/cover6">

    </FrameLayout>

    <ListView
        android:id="@+id/navList"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_gravity="start"
        android:background="#FFD12A"></ListView>

<android.support.v4.view.ViewPager
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/TheViewPager">

</android.support.v4.view.ViewPager>

</android.support.v4.widget.DrawerLayout>

This is the code for one of the fragments which run from fragment 1 to fragment 12

fragment_chapter1.xml

<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="match_parent"
    android:background="#F7F7F7">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical">
        <View
            android:id="@+id/view1"
            android:layout_width="fill_parent"
            android:layout_height="2dp"
            android:layout_alignParentRight="true"
            android:layout_marginTop="10dp"
            android:background="#000000" />

        <TextView
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:id="@+id/page1"
            android:text="@string/page1"
            android:layout_gravity="left"
            android:textStyle="italic"
            android:textSize="12sp"/>
        <View
            android:id="@+id/view2"
            android:layout_width="fill_parent"
            android:layout_height="2dp"
            android:layout_alignParentRight="true"
            android:background="#000000" />
        <TextView
            android:id="@+id/chapterheading"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/chapter1_heading"
            android:textAllCaps="true"
            android:paddingTop="16dp"
            android:paddingLeft="8dp"
            android:textColor="@android:color/black" />

        <TextView
            android:id="@+id/generaladvice"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="vertical"
            android:paddingBottom="5dp"
            android:paddingLeft="10dp"
            android:paddingRight="10dp"
            android:textAllCaps="true"
            android:paddingTop="16dp"
            android:text="@string/generaladvice"
            android:textColor="@android:color/black"
            android:textStyle="bold" />

        <TextView
            android:id="@+id/generaladvicecontent"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:paddingBottom="10dp"
            android:paddingTop="10dp"
            android:paddingLeft="38dp"
            android:paddingRight="20dp"
            android:text="@string/generaladvicecontent"
            android:textColor="@android:color/holo_red_dark"
            />

        <TextView
            android:id="@+id/targetgroup"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:orientation="vertical"
            android:paddingBottom="5dp"
            android:paddingLeft="10dp"
            android:textAllCaps="true"
            android:paddingRight="10dp"
            android:paddingTop="16dp"
            android:text="@string/targetgroup"
            android:textColor="@android:color/black"
            android:textStyle="bold" />

        <TextView
            android:id="@+id/targetgroupcontent"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:paddingBottom="10dp"
            android:paddingTop="10dp"
            android:paddingLeft="38dp"
            android:paddingRight="20dp"
            android:text="@string/targetgroupcontent"
            android:textColor="@android:color/black"
            />

        <TextView
            android:id="@+id/briefdescription"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="vertical"
            android:paddingBottom="5dp"
            android:paddingLeft="10dp"
            android:paddingRight="10dp"
            android:paddingTop="16dp"
            android:textAllCaps="true"
            android:text="@string/briefdescription"
            android:textColor="@android:color/black"
            android:textStyle="bold" />

        <TextView
            android:id="@+id/briefdescriptioncontent"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:paddingBottom="10dp"
            android:paddingTop="10dp"
            android:paddingLeft="38dp"
            android:paddingRight="20dp"
            android:text="@string/briefdescriptioncontent"
            android:textColor="@android:color/black"
            />
        <TextView
            android:id="@+id/vehicleanddriverlegaldocumentation"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="vertical"
            android:paddingBottom="5dp"
            android:paddingLeft="10dp"
            android:paddingRight="10dp"
            android:paddingTop="16dp"
            android:textAllCaps="true"
            android:text="@string/vehicleanddriverlegaldocumentation"
            android:textColor="@android:color/black"
            android:textStyle="bold" />

        <TextView
            android:id="@+id/vehicleanddriverlegaldocumentationcontent"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:paddingBottom="10dp"
            android:paddingTop="10dp"
            android:paddingLeft="38dp"
            android:paddingRight="20dp"
            android:text="@string/vehicleanddriverlegaldocumentationcontent"
            android:textColor="@android:color/black"
            />

        <TextView
            android:id="@+id/driverslicense"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:paddingBottom="10dp"
            android:paddingTop="10dp"
            android:paddingLeft="38dp"
            android:paddingRight="20dp"
            android:text="@string/driverslicensecontent"
            android:textColor="@android:color/black"
            />

        <TextView
            android:id="@+id/ProvisionalDriverLicence"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:paddingBottom="10dp"
            android:paddingTop="10dp"
            android:paddingLeft="38dp"
            android:paddingRight="20dp"
            android:text="@string/ProvisionalDriverLicence"
            android:textColor="@android:color/black"
            />

        <TextView
            android:id="@+id/RoadVehicleTax"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:paddingBottom="10dp"
            android:paddingTop="10dp"
            android:paddingLeft="38dp"
            android:paddingRight="20dp"
            android:text="@string/RoadVehicleTax"
            android:textColor="@android:color/black"/>

        <TextView
            android:id="@+id/CertificateofRoadworthiness"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:paddingBottom="10dp"
            android:paddingTop="10dp"
            android:paddingLeft="38dp"
            android:paddingRight="20dp"
            android:text="@string/CertificateofRoadworthiness"
            android:textColor="@android:color/black"
            />

        <TextView
            android:id="@+id/InsuranceCertificate"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:paddingBottom="8dp"
            android:paddingTop="10dp"
            android:paddingLeft="38dp"
            android:paddingRight="20dp"
            android:text="@string/InsuranceCertificate"
            android:textColor="@android:color/black"
            />

    </LinearLayout>

</ScrollView>

This code is for the Chapter1 fragment (Chapter1.java)

package com.aidforpcs.www.myfragmentexample;

import android.app.Activity;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.text.Html;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.webkit.WebView;
import android.widget.TextView;

/**
 * A simple {@link Fragment} subclass.
 */
public class Chapter1 extends Fragment {

//Initializing the webview
    private WebView mywebview1;

    public Chapter1() {
        // Required empty public constructor
    }

    @Override
    public void onAttach(Activity activity) {
        super.onAttach(activity);
    }

    @Override
    public void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        return inflater.inflate(R.layout.fragment_chapter1, container, false);

    }

    @Override
    public void onActivityCreated(Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
    }

    @Override
    public void onDetach() {
        super.onDetach();
    }
}
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