android intent example

In this post we are going to make an example that demonstrate the use of intent, intent filter and startActivity in android.
Create a new android application project in eclipse and name it as IntentDemo. I change the activity name as First_Activity and corresponding layout name as first_layout.
Ads by Google

---

---

Place a button on the first_layout.xml file as shown bellow.

 <RelativeLayout 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:paddingBottom="@dimen/activity_vertical_margin"  
   android:paddingLeft="@dimen/activity_horizontal_margin"  
   android:paddingRight="@dimen/activity_horizontal_margin"  
   android:paddingTop="@dimen/activity_vertical_margin"  
   tools:context=".First_Activity" >  
   <Button  
     android:id="@+id/bn"  
     android:layout_width="wrap_content"  
     android:layout_height="wrap_content"  
     android:layout_alignParentTop="true"  
     android:layout_centerHorizontal="true"  
     android:layout_marginTop="51dp"  
     android:text="Go TO SECOND ACTIVITY" />  
 </RelativeLayout>  

Now create a new Activity with class name  Second_Activity.java and layout name second_layout.xml.
Open the AndroidManifest.xml file and add the following code within the application tag.

 <activity  
       android:name=".Second_Activity"  
       android:label="@string/app_name" >  
       <intent-filter>  
         <action android:name="second_filter" />  
         <category android:name="android.intent.category.DEFAULT" />  
       </intent-filter>  
     </activity>  

Create an object of the intent in First_Activity.java file and start the second activity using startActivity method.

                     Intent i = new Intent("second_filter");  
                     startActivity(i);  

Finalized code for First_Activity.java is given bellow.

 package com.intentdemo;  
 import android.app.Activity;  
 import android.content.Intent;  
 import android.os.Bundle;  
 import android.view.Menu;  
 import android.view.View;  
 import android.view.View.OnClickListener;  
 import android.widget.Button;  
 public class First_Activity extends Activity {  
      Button button;  
      @Override  
      protected void onCreate(Bundle savedInstanceState) {  
           super.onCreate(savedInstanceState);  
           setContentView(R.layout.first_layout);  
           button = (Button)findViewById(R.id.bn);  
           button.setOnClickListener(new OnClickListener() {  
                @Override  
                public void onClick(View v) {  
                     // TODO Auto-generated method stub  
                     Intent i = new Intent("second_filter");  
                     startActivity(i);  
                }  
           });  
      }  
      @Override  
      public boolean onCreateOptionsMenu(Menu menu) {  
           // Inflate the menu; this adds items to the action bar if it is present.  
           getMenuInflater().inflate(R.menu.first_, menu);  
           return true;  
      }  
 }  

Code for Second_Activity.java

 package com.intentdemo;  
 import android.app.Activity;  
 import android.os.Bundle;  
 public class Second_Activity extends Activity{  
      @Override  
      protected void onCreate(Bundle savedInstanceState) {  
           // TODO Auto-generated method stub  
           super.onCreate(savedInstanceState);  
           setContentView(R.layout.second_layout);  
      }  
 }