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First Case of Intent in Android
Abhijeet Singh
Apr 01, 2020
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This article shows how to use intents in Android.
IntentIstcase.rar
Intent
An intent is an abstract description of an operation to be performed. In simple words, we can say that intent is basically used to notify the Android system about the occurrence of an event.
Procedure
Use the following procedure:
Start Eclipse IDE.
Create a new project.
Create two Java files, one is MainActivity.java and the other is a.java.
Create two XML files, one is activity_main.xml file and the second is other.xml for layout design.
In the first case of intent, we add an activity with an intent filter in the manifest file.
For instance
<
activity
android:name
=
"A"
android:label
=
"@string/app_name"
>
<
intent-filter
>
<
action
android:name
=
"abhijeet"
/>
<
category
android:name
=
"android.intent.category.DEFAULT"
/>
</
intent-filter
>
</
activity
>
Then look up the button by its id in the MainActivity.java file and declare a string in it.
Then in the onclick function declare an intent.
For example
public void onClick(View v) {
Intent
i
=
new
Intent(str);
startActivity(i);
}
The code is given below.
MainActivity.java
package
com.example.intentistcaseeeee;
import
android.os.Bundle;
import
android.app.Activity;
import
android.content.Intent;
import
android.view.Menu;
import
android.view.View;
import
android.view.View.OnClickListener;
import
android.widget.Button;
public
class
MainActivity
extends
Activity
implements
OnClickListener {
Button b1;
String str =
"abhijeet"
;
@Override
protected
void
onCreate(Bundle savedInstanceState) {
super
.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
b1 = (Button) findViewById(R.id.button1);
b1.setOnClickListener(
this
);
}
public
void
onClick(View v) {
Intent i =
new
Intent(str);
startActivity(i);
}
}
<
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
=
".MainActivity"
>
<
TextView
android:id
=
"@+id/textView1"
android:layout_width
=
"wrap_content"
android:layout_height
=
"wrap_content"
android:text
=
"@string/hello_world"
/>
<
Button
android:id
=
"@+id/button1"
android:layout_width
=
"wrap_content"
android:layout_height
=
"wrap_content"
android:layout_below
=
"@+id/textView1"
android:layout_marginTop
=
"52dp"
android:layout_toRightOf
=
"@+id/textView1"
android:text
=
"Button"
/>
</
RelativeLayout
>
A.java
package
com.example.intentistcaseeeee;
import
android.app.Activity;
import
android.os.Bundle;
public
class
A
extends
Activity {
@Override
protected
void
onCreate(Bundle savedInstanceState) {
super
.onCreate(savedInstanceState);
setContentView(R.layout.other);
}
}
Other.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"
>
<
Spinner
android:id
=
"@+id/spinner1"
android:layout_width
=
"match_parent"
android:layout_height
=
"wrap_content"
/>
<
RadioButton
android:id
=
"@+id/radioButton1"
android:layout_width
=
"wrap_content"
android:layout_height
=
"wrap_content"
android:text
=
"RadioButton"
/>
<
CheckBox
android:id
=
"@+id/checkBox1"
android:layout_width
=
"wrap_content"
android:layout_height
=
"wrap_content"
android:text
=
"CheckBox"
/>
</
LinearLayout
>
AndroidManifest.xml
<?xml version=
"1.0"
encoding=
"utf-8"
?>
<manifest
xmlns:android=
"http://schemas.android.com/apk/res/android"
package
=
"com.example.intentistcaseeeee"
android:versionCode=
"1"
android:versionName=
"1.0"
>
<uses-sdk
android:minSdkVersion=
"8"
android:targetSdkVersion=
"17"
/>
<application
android:allowBackup=
"true"
android:icon=
"@drawable/ic_launcher"
android:label=
"@string/app_name"
android:theme=
"@style/AppTheme"
>
<activity
android:name=
"MainActivity"
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=
"A"
android:label=
"@string/app_name"
>
<intent-filter>
<action android:name=
"abhijeet"
/>
<category android:name=
"android.intent.category.DEFAULT"
/>
</intent-filter>
</activity>
</application>
</manifest>
Output
By clicking on the Button:
Android
Intent in Android
Intent Procedure in Android
XML
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