Using Intent in an Android application to show another activity

Question

In my Android application, I have two activity classes. I have a button on the first one and I want to show the second when it is clicked, but I get an error. Here are the classes:

public class FirstActivity extends Activity {

  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    Button orderButton = (Button)findViewById(R.id.order);

    orderButton.setOnClickListener(new View.OnClickListener() {

      @Override
      public void onClick(View view) {
        Intent intent = new Intent(FirstActivity.this, OrderScreen.class);
        startActivity(intent);
      }

    });
  }
}

The second class that should show when the button is clicked, but never does:

public class OrderScreen extends Activity {

  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.order);

    Button orderButton = (Button) findViewById(R.id.end);

    orderButton.setOnClickListener(new View.OnClickListener() {

      @Override
      public void onClick(View view) {
        finish();
      }

    });
  }
}

How do I create a button that will show the second activity?

Do you get an error when you compile or run time? In either case, what is the error? — Quintin Robinson, Apr 10 '09 at 03:12
This was a run time error. The emulator gave the generic "the application has stopped unexpectedly" error, but using the debugger, it showed a "android.content.ActivityNotFoundException: Unable to find explicit activity class {class name} have you declared this activity in your AndroidManifest.xml? — Tai Squared, Apr 10 '09 at 15:24
It is a very common bug that people forget to add their activity into Manifest.xml but there should be way to enter it automatically. — AZ_, Nov 24 '10 at 10:26

score 177 · Accepted Answer · edited Jul 05 '15 at 05:06

177

The issue was the OrderScreen Activity wasn't added to the AndroidManifest.xml. Once I added that as an application node, it worked properly.

<activity android:name=".OrderScreen" />

edited Jul 05 '15 at 05:06

N J

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answered Apr 10 '09 at 15:22

Tai Squared

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Can you explain why this is needed? – Louis Rhys Sep 16 '12 at 14:27
@LouisRhys all activities need to be declared in the manifest file. See `Description` section here: http://developer.android.com/guide/topics/manifest/activity-element.html – ataulm Dec 22 '12 at 17:01

score 162 · Answer 2 · answered Sep 12 '09 at 18:19

162

Add this line to your AndroidManifest.xml:

<activity android:name=".OrderScreen" />

answered Sep 12 '09 at 18:19

user106011

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7

Why did people upvote this answer from months later? – Jaykul Sep 06 '14 at 04:34
5

@Jaykul see the edit from 2013 in the accepted answer – pomber Jan 08 '15 at 14:10

score 16 · Answer 3 · edited Dec 14 '12 at 07:26

----FirstActivity.java-----

    package com.mindscripts.eid;
    import android.app.Activity;
    import android.content.Intent;
    import android.os.Bundle;
    import android.view.View;
    import android.view.View.OnClickListener;
    import android.widget.Button;

public class FirstActivity extends Activity {

protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    Button orderButton = (Button) findViewById(R.id.order);
    orderButton.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            Intent intent = new Intent(FirstActivity.this,OrderScreen.class);
            startActivity(intent);
        }
    });

 }
}

---OrderScreen.java---

    package com.mindscripts.eid;

    import android.app.Activity;
    import android.os.Bundle;
    import android.view.View;
    import android.view.View.OnClickListener;
    import android.widget.Button;



    public class OrderScreen extends Activity {
@Override



protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.second_class);
    Button orderButton = (Button) findViewById(R.id.end);
    orderButton.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            finish();
        }
    });

 }
}

---AndroidManifest.xml----

    <?xml version="1.0" encoding="utf-8"?>
    <manifest xmlns:android="http://schemas.android.com/apk/res/android"
  package="com.mindscripts.eid"
  android:versionCode="1"
  android:versionName="1.0">


<application android:icon="@drawable/icon" android:label="@string/app_name">
    <activity android:name=".FirstActivity"
              android:label="@string/app_name">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
    <activity android:name=".OrderScreen"></activity>
</application>

You may want to explain your answer for the benefit of the OP — Luca, Oct 20 '12 at 01:40

score 4 · Answer 4 · answered Nov 20 '12 at 19:04

4

Use this code:

Intent intent=new Intent(context,SecondActivty.class);
startActivity(intent);
finish();

context: refer to current activity context,

please make sure that you have added activity in android manifest file.

Following code for adding activity in android manifest file

<Activity name=".SecondActivity">
</Activity>

answered Nov 20 '12 at 19:04

Mahesh

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java.lang.IllegalStateException: Fragment GetUserNumber{536bc00c} not attached to Activity. – Iman Marashi Jul 27 '15 at 15:05

score 4 · Answer 5 · edited Sep 11 '13 at 01:39

4

<activity android:name="[packagename optional].ActivityClassName"></activity>

Simply adding the activity which we want to switch to should be placed in the manifest file

edited Sep 11 '13 at 01:39

jbihan

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answered Feb 21 '13 at 10:15

java dev

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score 3 · Answer 6 · answered Jun 06 '12 at 10:24

When you create any activity in android file you have to specify it in AndroidManifest.xml like

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

<application
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name" >
    <activity
        android:name=".MyCreativityActivity"
        android:label="@string/app_name" >
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>


     <activity android:name=".OrderScreen"></activity>


</application>

score 3 · Answer 7 · answered Feb 09 '13 at 08:34

3

b1 = (Button) findViewById(R.id.click_me);
        b1.setOnClickListener(new OnClickListener() {

            public void onClick(View v) {

                Intent i = new Intent(MainActivity.this, SecondActivity.class);
                startActivity(i);

            }
        });

answered Feb 09 '13 at 08:34

Hiren Patel

52,124
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Add SecondActivity class in your menifest file. – Hiren Patel Apr 04 '13 at 08:54
The method setOnClickListener(View.OnClickListener) in the type View is not applicable for the arguments (new OnClickListener(){})? – Mar 13 '15 at 13:36

score 2 · Answer 8 · answered Apr 01 '15 at 06:17

2

add the activity in your manifest file

<activity android:name=".OrderScreen" />

answered Apr 01 '15 at 06:17

Neal Ahluvalia

1,538
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score 2 · Answer 9 · answered Sep 24 '16 at 06:50

2

In the Manifest

<activity android:name=".OrderScreen" />

In the Java Code where you have to place intent code

startActivity(new Intent(CurrentActivity.this, OrderScreen.class);

answered Sep 24 '16 at 06:50

Nilesh

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1

You are missing one closing bracket in `startActivity` It should be like this: `startActivity(new Intent(CurrentActivity.this, OrderScreen.class));` – Strange Feb 05 '19 at 10:40

score 1 · Answer 10 · edited Jun 15 '12 at 17:43

1

Intent i = new Intent("com.Android.SubActivity");
startActivity(i);

edited Jun 15 '12 at 17:43

FoamyGuy

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answered Jun 09 '12 at 12:46

Ndupza

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score 1 · Answer 11 · edited Feb 13 '12 at 13:21

1

you can use the context of the view that did the calling. Example:

Button orderButton = (Button)findViewById(R.id.order);

orderButton.setOnClickListener(new View.OnClickListener() {

  @Override
  public void onClick(View view) {
    Intent intent = new Intent(/*FirstActivity.this*/ view.getContext(), OrderScreen.class);
    startActivity(intent);
  }

});

edited Feb 13 '12 at 13:21

answered Feb 11 '12 at 01:52

Bruno

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1

The method getContext() is undefined for the type MainActivity? – Mar 13 '15 at 13:34

Using Intent in an Android application to show another activity

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