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
– Quintin Robinson, Commented Apr 10, 2009 at 3:12
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
– Tai Squared, Commented Apr 10, 2009 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_
– AZ_, Commented Nov 24, 2010 at 10:26

N J · Accepted Answer · 2015-07-05 05:06:59Z

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 5, 2015 at 5:06

N J

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answered Apr 10, 2009 at 15:22

Tai Squared

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2 Comments

Louis Rhys Over a year ago

Can you explain why this is needed?

ataulm Over a year ago

@LouisRhys all activities need to be declared in the manifest file. See Description section here: developer.android.com/guide/topics/manifest/…

user106011 · Accepted Answer · 2009-09-12 18:19:25Z

162

Add this line to your AndroidManifest.xml:

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

answered Sep 12, 2009 at 18:19

user106011

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2 Comments

Jaykul Over a year ago

Why did people upvote this answer from months later?

pomber Over a year ago

@Jaykul see the edit from 2013 in the accepted answer

Name is Nilay · Accepted Answer · 2012-12-14 07:26:53Z

----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

Mahesh · Accepted Answer · 2012-11-20 19:04:56Z

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>

java.lang.IllegalStateException: Fragment GetUserNumber{536bc00c} not attached to Activity.

jbihan · Accepted Answer · 2013-09-11 01:39:58Z

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

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

Android-iPhone-rahul · Accepted Answer · 2012-06-06 10:24:38Z

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>

Hiren Patel · Accepted Answer · 2013-02-09 08:34:26Z

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 9, 2013 at 8:34

Hiren Patel

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2 Comments

Hiren Patel Over a year ago

Add SecondActivity class in your menifest file.

user4652595 Over a year ago

The method setOnClickListener(View.OnClickListener) in the type View is not applicable for the arguments (new OnClickListener(){})?

Neal Ahluvalia · Accepted Answer · 2015-04-01 06:17:45Z

2

add the activity in your manifest file

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

answered Apr 1, 2015 at 6:17

Neal Ahluvalia

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Comments

Nilesh · Accepted Answer · 2016-09-24 06:50:35Z

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, 2016 at 6:50

Nilesh

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1 Comment

Strange Over a year ago

You are missing one closing bracket in startActivity It should be like this: startActivity(new Intent(CurrentActivity.this, OrderScreen.class));

Bruno · Accepted Answer · 2012-02-13 13:21:20Z

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); } });

The method getContext() is undefined for the type MainActivity?

FoamyGuy · Accepted Answer · 2012-06-15 17:43:39Z

1

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

edited Jun 15, 2012 at 17:43

FoamyGuy

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answered Jun 9, 2012 at 12:46

Ndupza

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