Back Stack Android Example

BackStack Example Output :

Output of this example

Project Structure

Step 1 :

Create 3 Activities : 

1) ActivityB

2) ActivityC

3) ActivityD

Step 2:

activity_main

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

 android:layout_width="match_parent"

 android:layout_height="match_parent"

 android:orientation="vertical"

 android:gravity="center">

 <TextView

 android:layout_width="wrap_content"

 android:layout_height="wrap_content"

 android:text="Activity A"

 android:textAppearance="@android:style/TextAppearance.DeviceDefault.Large"/>

 <Button

 android:layout_width="wrap_content"

 android:layout_height="wrap_content"

 android:text="Next Activity->B"

 android:onClick="onNextActivity"/>

</LinearLayout>

MainActivity.java

import android.content.Intent;

import android.support.v7.app.ActionBarActivity;

import android.os.Bundle;

import android.view.View;

public class MainActivity extends ActionBarActivity {

 @Override

 protected void onCreate(Bundle savedInstanceState) {

 super.onCreate(savedInstanceState);

 setContentView(R.layout.activity_main);

 }

 public void onNextActivity (View view)

 {

 Intent intent = new Intent(this, ActivityB.class);

 startActivity(intent);

 }

}

Step 3 :

activity_b

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:gravity="center"

android:orientation="vertical">

<TextView

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="Activity B"

android:textAppearance="@android:style/TextAppearance.DeviceDefault.Large" />

<Button

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:onClick="onNextActivity"

android:text="Next Activity -> C" />

</LinearLayout>

ActivityB.java

import android.content.Intent;

import android.support.v7.app.ActionBarActivity;

import android.os.Bundle;

import android.view.View;

public class ActivityB extends ActionBarActivity {

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_activity_b);

}

public void onNextActivity (View view)

{

Intent intent = new Intent(this, ActivityC.class);

intent.setFlags(intent.getFlags() | Intent.FLAG_ACTIVITY_NO_HISTORY);

startActivity(intent);

}

}

Step 4 :

activity_c

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

android:layout_width="match_parent"

 android:layout_height="match_parent"

 android:gravity="center"

 android:orientation="vertical">

 <TextView

 android:layout_width="wrap_content"

 android:layout_height="wrap_content"

 android:text="Activity C"

 android:textAppearance="@android:style/TextAppearance.DeviceDefault.Large" />

 <Button

 android:layout_width="wrap_content"

 android:layout_height="wrap_content"

 android:onClick="onNextActivity"

 android:text="Next Activity -> D" />

</LinearLayout>

ActivityC.java

import android.content.Intent;

import android.support.v7.app.ActionBarActivity;

import android.os.Bundle;

import android.view.View;

public class ActivityC extends ActionBarActivity {

 @Override

 protected void onCreate(Bundle savedInstanceState) {

 super.onCreate(savedInstanceState);

 setContentView(R.layout.activity_activity_c);

 }

 public void onNextActivity (View view)

 {

 Intent intent = new Intent(this, ActivityD.class);

 startActivity(intent);

 }

 public void onBackPressed() {

 Intent myIntent = new Intent(this,MainActivity.class);

 myIntent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);// clear the backstack

 startActivity(myIntent);

 finish();

 return;

 }

}

Step 5 :

activity_d

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

android:layout_width="match_parent"

 android:layout_height="match_parent"

 android:gravity="center"

 android:orientation="vertical">

 <TextView

 android:layout_width="wrap_content"

 android:layout_height="wrap_content"

 android:text="Activity D"

 android:textAppearance="@android:style/TextAppearance.DeviceDefault.Large" />

 <Button

 android:layout_width="wrap_content"

 android:layout_height="wrap_content"

 android:onClick="onExit"

 android:text="Exit" />

</LinearLayout>

ActivityD.java

import android.content.Intent;

import android.support.v7.app.ActionBarActivity;

import android.os.Bundle;

import android.view.View;

public class ActivityD extends ActionBarActivity {

 @Override

 protected void onCreate(Bundle savedInstanceState) {

 super.onCreate(savedInstanceState);

 setContentView(R.layout.activity_activity_d);

 }

 public void onExit (View view)

 {

 Intent intent = new Intent(Intent.ACTION_MAIN);

 intent.addCategory(Intent.CATEGORY_HOME);

 intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);

 startActivity(intent);

 ActivityD.this.finish();

 }

 public void onBackPressed() {

 Intent myIntent = new Intent(this,ActivityB.class);

 myIntent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);// clear the backstack

 startActivity(myIntent);

 finish();

 return;

 }

}

Step 6 :

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

 package="com.pratik.backstackdemo" >

 <application

 android:allowBackup="true"

 android:icon="@mipmap/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=".ActivityB"

 android:label="@string/title_activity_activity_b" >

 </activity>

 <activity

 android:name=".ActivityC"

 android:label="@string/title_activity_activity_c" >

 </activity>

 <activity

 android:name=".ActivityD"

 android:label="@string/title_activity_activity_d" >

 </activity>

 </application>

</manifest>

Step 7 :

Run the app and enjoy it....

Download This Project from below link : 

https://drive.google.com/file/d/0By1zg6cvLTQ9ZFNrRFhFa3J2cXM/view?usp=sharing