How to create an activity and linked with button to open using Android Studio?

Question

I have MainActivity and trying to extend this activity to create About Us page for users. I have text About Us on menu when clicked to open the extended activity.

Here is the XML for About Us page:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:ads="http://schemas.android.com/apk/res-auto"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">

    <ScrollView
        android:id="@+id/scrollView1"
        android:layout_width="match_parent"
        android:layout_height="match_parent" >

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_alignParentTop="true"
            android:layout_centerHorizontal="true"
            android:gravity="center_horizontal"
            android:orientation="vertical" >

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Maihan Nijat is making app."
                android:id="@+id/textView" />
        </LinearLayout>
    </ScrollView>

</RelativeLayout>

And the extended About Us Activity

public class AboutUs extends ActivityMain {

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

And this is how I linked:

else if (id == R.id.nav_about) {
   Intent i = new Intent(getApplicationContext(), AboutUs.class);
   startActivity(i);
}

I have imported all the required importings.

When I run the app and click on the About Us it says "unfortunately the app has stopped'

Log Cat:

     Process: com.revittechnology.pashtodictionary, PID: 25122
                                                                                           android.content.ActivityNotFoundException: Unable to find explicit
activity class
 {com.revittechnology.pashtodictionary/com.revittechnology.pashtodictionary.AboutUs};
 have you declared this activity in your AndroidManifest.xml?
                                                                                               at
 android.app.Instrumentation.checkStartActivityResult(Instrumentation.java:1794)
                                                                                               at
 android.app.Instrumentation.execStartActivity(Instrumentation.java:1512)
                                                                                               at android.app.Activity.startActivityForResult(Activity.java:3917)
                                                                                               at android.app.Activity.startActivityForResult(Activity.java:3877)
                                                                                               at
 android.support.v4.app.FragmentActivity.startActivityForResult(FragmentActivity.java:784)
                                                                                               at android.app.Activity.startActivity(Activity.java:4200)
                                                                                               at android.app.Activity.startActivity(Activity.java:4168)
                                                                                               at
 com.revittechnology.pashtodictionary.ActivityMain.onNavigationSelected(ActivityMain.java:148)
                                                                                               at
 com.revittechnology.pashtodictionary.ActivityMain$2.onNavigationItemSelected(ActivityMain.java:94)
                                                                                               at
 android.support.design.widget.NavigationView$1.onMenuItemSelected(NavigationView.java:150)
                                                                                               at
 android.support.v7.view.menu.MenuBuilder.dispatchMenuItemSelected(MenuBuilder.java:811)
                                                                                               at
 android.support.v7.view.menu.MenuItemImpl.invoke(MenuItemImpl.java:152)
                                                                                               at
 android.support.v7.view.menu.MenuBuilder.performItemAction(MenuBuilder.java:958)
                                                                                               at
 android.support.design.internal.NavigationMenuPresenter$1.onClick(NavigationMenuPresenter.java:308)
                                                                                               at android.view.View.performClick(View.java:5198)
                                                                                               at android.view.View$PerformClick.run(View.java:21147)
                                                                                               at android.os.Handler.handleCallback(Handler.java:739)
                                                                                               at android.os.Handler.dispatchMessage(Handler.java:95)
                                                                                               at android.os.Looper.loop(Looper.java:148)
                                                                                               at android.app.ActivityThread.main(ActivityThread.java:5417)
                                                                                               at java.lang.reflect.Method.invoke(Native Method)
                                                                                               at
 com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
                                                                                              at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)

are you getting any error message? – ΦXocę 웃 Пepeúpa ツ Feb 17 '16 at 04:21 — ΦXocę 웃 Пepeúpa ツ, Feb 17 '16 at 04:21
ok, that means there is a log cat entry, can you post it? – ΦXocę 웃 Пepeúpa ツ Feb 17 '16 at 04:24 — ΦXocę 웃 Пepeúpa ツ, Feb 17 '16 at 04:24
post your logcat @MaihanNijat – KDeogharkar Feb 17 '16 at 04:25 — KDeogharkar, Feb 17 '16 at 04:25
Did you put yor "About Us" activity in Manifest file? – Ankur Aggarwal Feb 17 '16 at 04:27 — Ankur Aggarwal, Feb 17 '16 at 04:27

score 1 · Accepted Answer · answered Feb 17 '16 at 04:30

you are initializing a textview in a wrong way.

parent_view = findViewById(android.R.id.textView); //here

instead cast the view to a proper textview class

parent_view = (TextView)findViewById(android.R.id.textView); //here must be cast

verify aswell if you have declared your AboutUs activity in the app manifest.

score 1 · Answer 2 · answered Feb 17 '16 at 04:31

Check your AndroidManifest.xml is like this,

<manifest xmlns:android="http://schemas.android.com/apk/res/android"  
    package="com.javatpoint.hello"  
    android:versionCode="1"  
    android:versionName="1.0" >  

    <uses-sdk  
        android:minSdkVersion="8"  
        android:targetSdkVersion="15" />  

    <application  
        android:icon="@drawable/ic_launcher"  
        android:label="@string/app_name"  
        android:theme="@style/AppTheme" >  
        <activity  
            android:name=".MainActivity"  
            android:label="@string/title_activity_main" >  
            <intent-filter>  
                <action android:name="android.intent.action.MAIN" />  

                <category android:name="android.intent.category.LAUNCHER" />  
            </intent-filter>  
        </activity>
            <activity  
            android:name=".Aboutus"  
            android:label="@string/title_aboutus" >  
        </activity>
    </application>  
</manifest>

score 1 · Answer 3 · edited May 23 '17 at 12:07

1

Please ADD AboutUs to your AndroidManifest.xml.

This is error because you dont have declared activity in AndroidManifest.

ADD like

<activity  
android:name=".AboutUs"  
android:screenOrientation="portrait" />

Please check add activity manifest stack answer

edited May 23 '17 at 12:07

Community

1
1

answered Feb 17 '16 at 04:32

Amit Vaghela

22,772
22
86
142

score 1 · Answer 4 · answered Feb 17 '16 at 04:35

1

I'm assuming About us is another activity. In that case you need to extend your About Us class to either Activity or AppCompatActivity(if you want backward compatibility).

answered Feb 17 '16 at 04:35

Shashank Udupa

2,173
1
19
26

How to create an activity and linked with button to open using Android Studio?

4 Answers4