Android

Android Intent Example with source code
Author : Ishtek

Setup Eclipse with Android ADT Plugin for test/code environment (by using Android API Level 7 and Emulator).
P.S- Above page is having around 14 images, download size could be around 700KB.

This Page and/or example code is using Android API Level 7 and tested using corresponding Emulator only.
For latest information please refer Android Official website.

Using Android API Level : 7
In this example we shall see a very simple ways to work with
Intent from Android platform and I have used Intent API from Android Platform.

This example is having two different Activities and first activity is displayed
on launch of this example application. While the other activity is displayed
when a button is clicked from the first activity screen.


First Activity ScreenSecond Activity Screen
For navigating from one activity to another activity screen, I have used Android Intent API from Android Platform. This example's AndroidManifest.xml file contains configuration entries for both these Activities as shown below: AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.techienjoy.intents.example" android:versionCode="1" android:versionName="1.0"> <uses-sdk android:minSdkVersion="7" /> <application android:icon="@drawable/icon" android:label="@string/app_name"> <activity android:name=".IntentsExamples" 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=".TestIntent" android:label="@string/app_name"> </activity> </application> </manifest>
As shown in the configuration above, we have two activity entries present within a
single Application entry. By default "IntentsExamples" will be launched on invocation
of this application.

Layout and widgets used in these activities are provided by coding only. Code for these
activities are as shown below:
IntentsExamples.java
/**
* This code is provided on "AS IS" basis without guarantee/warranty
* of any kind. Use of this code subjected to user's own risk.
* @Author: Ishtek
*/
package com.techienjoy.intents.example;

import android.app.Activity;
import android.content.Intent;
import android.graphics.Color;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup.LayoutParams;
import android.widget.Button;
import android.widget.LinearLayout;

public class IntentsExamples extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        
        Button showTestIntent = new Button(this);
        showTestIntent.setBackgroundColor(Color.GREEN);
        showTestIntent.setText("Show Next Activity");
        setContentView(showTestIntent,new LinearLayout.LayoutParams(LayoutParams.WRAP_CONTENT,
                                                                    LayoutParams.WRAP_CONTENT));
        
        showTestIntent.setOnClickListener(new OnClickListener() {
            
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(IntentsExamples.this,TestIntent.class);
                startActivity(intent);
            }
        });
    }
}
As shown in the above lines of code, There is an instance of Intent created
and the second activity class name is passed as argument to this Intent instance.
As soon as the button is clicked on the main screen, onClick callback method
will be called and startActivity(intent) method will make the TestIntent activity
to show up on screen.
TestIntent.java
/**
* This code is provided on "AS IS" basis without guarantee/warranty
* of any kind. Use of this code subjected to user's own risk.
* @Author: Ishtek
*/

package com.techienjoy.intents.example;

import android.app.Activity;
import android.graphics.Color;
import android.os.Bundle;
import android.view.ViewGroup.LayoutParams;
import android.widget.LinearLayout;
import android.widget.TextView;

public class TestIntent extends Activity {

    @Override
    public void onCreate(Bundle bundle) {
        super.onCreate(bundle);
        TextView txtView = new TextView(this);
        txtView.setLayoutParams(new LinearLayout.LayoutParams(LayoutParams.FILL_PARENT, 
                                                              LayoutParams.WRAP_CONTENT));
        txtView.setBackgroundColor(Color.GREEN);
        txtView.setTextColor(Color.BLACK);
        txtView.setText("Next Activity: TestIntent");
        setContentView(txtView);
    }
}

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Name: GirishDated: 2013-10-27 17:52:50
What are the various types of Intents available on Android Platform? What would be right way/scenarios for using an Intent between multiple activities communication or for using any third-party application activity.    
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