Add two fragments in one Activity in android

Question

I want to add two fragments in one Activity in Android. But on adding, it is giving error;

java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.namal.fragments/com.example.namal.fragments.MainActivity}: android.view.InflateException: Binary XML file line #10: Error inflating class fragment at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2695) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2769) at android.app.ActivityThread.access$900(ActivityThread.java:177) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1430) at android.os.Handler.dispatchMessage(Handler.java:102) at android.os.Looper.loop(Looper.java:135) at android.app.ActivityThread.main(ActivityThread.java:5910) 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:1405) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1200) Caused by: android.view.InflateException: Binary XML file line #10: Error inflating class fragment at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:763) at android.view.LayoutInflater.rInflate(LayoutInflater.java:806) at android.view.LayoutInflater.inflate(LayoutInflater.java:504) at android.view.LayoutInflater.inflate(LayoutInflater.java:414) at android.view.LayoutInflater.inflate(LayoutInflater.java:365) at android.support.v7.app.AppCompatDelegateImplV9.setContentView(AppCompatDelegateImplV9.java:284) at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:140) at com.example.namal.fragments.MainActivity.onCreate(MainActivity.java:14) at android.app.Activity.performCreate(Activity.java:6178) at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1118) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2648) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2769)  at android.app.ActivityThread.access$900(ActivityThread.java:177)  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1430)  at android.os.Handler.dispatchMessage(Handler.java:102)  at android.os.Looper.loop(Looper.java:135)  at android.app.ActivityThread.main(ActivityThread.java:5910)  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:1405)  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1200)  Caused by: java.lang.RuntimeException: com.example.namal.fragments.MainActivity@1602e5b8 must implement OnFragmentInteractionListener at com.example.namal.fragments.Pie1.onAttach(Pie1.java:83) at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1043) at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1268) at android.support.v4.app.FragmentManagerImpl.addFragment(FragmentManager.java:1370) at android.support.v4.app.FragmentManagerImpl.onCreateView(FragmentManager.java:2415) at android.support.v4.app.FragmentController.onCreateView(FragmentController.java:120) at android.support.v4.app.FragmentActivity.dispatchFragmentsOnCreateView(FragmentActivity.java:376) at android.support.v4.app.BaseFragmentActivityHoneycomb.onCreateView(BaseFragmentActivityHoneycomb.java:33) at android.support.v4.app.FragmentActivity.onCreateView(FragmentActivity.java:75) at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:733) at android.view.LayoutInflater.rInflate(LayoutInflater.java:806)  at android.view.LayoutInflater.inflate(LayoutInflater.java:504)  at android.view.LayoutInflater.inflate(LayoutInflater.java:414)  at android.view.LayoutInflater.inflate(LayoutInflater.java:365)  at android.support.v7.app.AppCompatDelegateImplV9.setContentView(AppCompatDelegateImplV9.java:284)  at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:140)  at com.example.namal.fragments.MainActivity.onCreate(MainActivity.java:14)  at android.app.Activity.performCreate(Activity.java:6178)  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1118)  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2648)  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2769)  at android.app.ActivityThread.access$900(ActivityThread.java:177)  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1430)  at android.os.Handler.dispatchMessage(Handler.java:102)  at android.os.Looper.loop(Looper.java:135)  at android.app.ActivityThread.main(ActivityThread.java:5910)  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:1405)  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1200) 

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.example.namal.fragments.MainActivity">


    <fragment
        android:layout_width="match_parent"
        android:layout_height="100dp"
        android:name="com.example.namal.fragments.Pie1"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="37dp"
        android:layout_marginBottom="20dp"
        android:id="@+id/fragment" />

    <fragment
        android:layout_width="match_parent"
        android:layout_height="100dp"
        android:name="com.example.namal.fragments.Pie2"
        android:layout_below="@+id/fragment"
        android:layout_alignParentRight="true"
        android:layout_alignParentEnd="true"
        android:id="@+id/fragment2" />
</RelativeLayout>

MainAvtivity.java

public class MainActivity extends AppCompatActivity {

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

        Pie1 firstFragment = new Pie1();

        FragmentManager fm = getSupportFragmentManager();
        Fragment fragment = fm.findFragmentById(R.id.activity_main);

        if (fragment == null) {
            fm.beginTransaction()
                    .add(R.id.fragment, firstFragment)
                    .commit();

            Pie2 secondFragment = new Pie2();
            fm.beginTransaction()
                    .add(R.id.fragment2, secondFragment)
                    .commit();
        }
    }
}

Layout of Fragment1

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/colorAccent"
   >

    <!-- TODO: Update blank fragment layout -->
    <TextView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:text="@string/hello_blank_fragment" />

    <TextView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:text="hello_blank_fragment 2" />

    <TextView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:text="hello_blank_fragment 3" />

    <TextView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:text="hello_blank_fragment 4" />

</FrameLayout>

Layout of Fragment 2

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/colorPrimaryDark"
    tools:context="com.example.namal.fragments.Pie2">

    <!-- TODO: Update blank fragment layout -->
    <TextView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:text="hello_blank_fragment 5" />

    <TextView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:text="hello_blank_fragment 6" />

    <TextView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:text="hello_blank_fragment 7" />

    <TextView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:text="hello_blank_fragment 8" />

</FrameLayout>

Answer 1

Caused by: java.lang.RuntimeException:
    com.example.namal.fragments.MainActivity@1602e5b8 must implement OnFragmentInteractionListener
    at com.example.namal.fragments.Pie1.onAttach(Pie1.java:83)

You need to make you activity implements OnFragmentInteractionListener

public class MainActivity extends AppCompatActivity implements OnFragmentInteractionListener {