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Sunday, 29 September 2013

Open another Activity in Android using Explicit intent

In this android application we will learn how to open another activity of our project. We will use Explicit intent to open another activity first we'll lean what is intent than what is explicit intent:

Intent:- Intent is an android service that gives us the facilities of accessing one activity from the other activity. Basically, There are two types of Intent:

1) Implicit Intent

2) Explicit Intent

Explicit Intent:- Accessing one user define activity from the other activity like open new page of the application.

Here we are giving example of Implicit intent. So, create new project and drop one text view and one button. The code of android XML files is given below:

Open another Activity in Android using Explicit intentOpen another Activity in Android using Explicit intent

(Main XML file:- activity_main.xml)

<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:background="#373">
<TextView
  android:id="@+id/textView1"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:layout_alignParentTop="true"
  android:layout_centerHorizontal="true"
  android:layout_marginTop="50dp"
  android:text="first Activity"
  android:textSize="35sp" />
<Button
  android:id="@+id/button1"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:layout_below="@+id/textView1"
  android:layout_centerHorizontal="true"
  android:layout_marginTop="42dp"
  android:onClick="call"
  android:text="Click to call Second" />
</RelativeLayout>

(Second XML file:- second.xml)

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:orientation="vertical"
  android:background="#077">
<TextView
  android:id="@+id/textView1"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:text="Second Activity"
  android:layout_marginTop="20dp"
  android:layout_marginLeft="30dp"
  android:textSize="35sp" />
<Button
  android:id="@+id/button1"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:onClick="call"
  android:layout_marginLeft="110dp"
  android:text="Go to first" />
</LinearLayout>

Now open Java file and initialize all objects. Use the following trick to use explicit intent:
Intent obj=new Intent(From,To);
The code of both android Java files is given below with description:

(Main Java file:- MainActivity.java)

package sel.expli; //you package name
import android.os.Bundle;
import android.view.View;
import android.app.Activity;
import android.content.Intent;
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  //set layout
  setContentView(R.layout.activity_main);
  }
  //This method is called when we click on button
  //and it is declare in main XML file in button tag
  //we have to pass View object in this method
  public void call(View v)
  {
  //define in intent where you want to go
  //use Intent(From,To) like we are sending a post
  Intent i=new Intent(this, SecondActivity.class);
  //start the given action to Intent
  startActivity(i);
  //finish this activity
  finish();
  }
}

(Second Java file:- SecondActivity.java)

package sel.expli; //you package name
import android.os.Bundle;
import android.view.View;
import android.app.Activity;
import android.content.Intent;

public class SecondActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  //set layout
  setContentView(R.layout.second);
  }
  //See the explanation of main activity
  //both are same
  public void call(View v)
  {
  Intent i=new Intent(this, MainActivity.class);
  startActivity(i);
  finish();
  }
}

Now update AndroidManifist.xml file to use another activity in your project. Use the code below </activity> tag:


<activity android:name="sel.expli.SecondActivity" 
android:label="@string/app_name">
</activity>

Here sel.expli is your package name and SecondActivity (SeconActivity.java) is your second activity name.
Intent-filter in Android XML file is used to define which activity will launch first. Now run your project and test application. If you have any doubt please comment.

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16 comments:

  1. This comment has been removed by the author.

    ReplyDelete
  2. brother where is the button code(reference) in java files... ???

    ReplyDelete
    Replies
    1. No need to make object of button in Java file because there are two method to perform action on button: 1. implements on click listener in Java which is more complex and take more memory. 2. define tag in XML button: android:onClick="method_name" and use this method in activity and pass View object which keeps id of clicked button. I mostly used second method.

      Delete
    2. Hai sir,
      I am kiran kumar ,i have a dot on otp
      1.how to send otp from android app to customer

      Delete
  3. brother! for every button we will need such code...?

    public void on_click_tag(View v)
    {
    //code
    }

    ReplyDelete
    Replies
    1. Yes but it depends on your use. You can use other method also.

      Delete
  4. it works excellently! awesome work sir!

    ReplyDelete
  5. This comment has been removed by the author.

    ReplyDelete
  6. It Excellent Works.!yehh

    ReplyDelete
  7. This comment has been removed by a blog administrator.

    ReplyDelete
  8. Hello Sir, I want to develop an android app which is a 500 Songs lyrics. i want to use list view but pls tell me how to show songs 1, songs 2 and so on till songs 500. when we click on songs 1, it should display the lyrics in another activity screen.please help me out. thanks in advance

    ReplyDelete
  9. This comment has been removed by the author.

    ReplyDelete
  10. This application is run but not move on second activity.imulator is given the error..plz help me

    ReplyDelete
  11. how to set phone number and E-mail validation in android

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