onPause() Method Tutorial With Example In Android

onPause() Method In Android Activity Life Cycle:

• When Activity is in background then onPause() method will execute
• Activity is not visible to user and goes in background when onPause() method is executed

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onPause() Example In Android:

Lets create onPause() program to understand the topic:

Final Output that we will create:

Step 1:

Designing The UI for Main Activity

Create activity (content_main.xml we created here) and design a simple Button displaying “Next Activity”. We also created a textView telling user to click on the button. Below is the xml code of content_main.xml:

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

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

    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/layout"
    android:background="#000">

    <Button

        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:onClick="onClickButton"
        android:text="Next Activity"
        android:id="@+id/button" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceLarge"
        android:text="Click On Next Activity To See onPause() Method Called"
        android:id="@+id/textView"
        android:textColor="#ffffff"
        android:layout_below="@+id/button"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:layout_marginLeft="45dp"
        android:layout_marginStart="45dp" />

</RelativeLayout>

Step 2:

Code MainActivity.java where use toast method to display onPause() method when the acitivity goes in background. Below is the code MainActivity.java:

package abhiandroid.com.onpauseexample;

import android.content.Intent;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.RelativeLayout;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

    RelativeLayout layout;

    @Override
    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        setContentView(R.layout.content_main);
        layout = (RelativeLayout) findViewById(R.id.layout);

    }


    public void onClickButton(View v) {

        Intent i = new Intent(this, Second.class);
        startActivity(i);
    }


    @Override
    protected void onStart() {
        super.onStart();
        Toast.makeText(getApplicationContext(), "onStart called", Toast.LENGTH_LONG).show();
    }


    @Override
    protected void onResume() {

        super.onResume();
        Toast.makeText(getApplicationContext(), "onResumed called", Toast.LENGTH_LONG).show();

    }

    @Override
    protected void onPause() {

        super.onResume();
        Toast.makeText(getApplicationContext(), "onPause called", Toast.LENGTH_LONG).show();

    }

}

Important Note:

You will get error because we have not yet created content_second.xml and Second.java file. So that error will be solved in next steps.

Step 3: Now create a content_second.xml where we will display the text “onPause() method called for previous activity because it goes in background”. Below is the content_second.xml code:

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

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

    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceLarge"
        android:text="Previous Activity Goes in Background so onPause() called for that activity"
        android:id="@+id/textView2"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true" />
</RelativeLayout>

Step 4:

In Second.java put the below code where we will simply call content_second.xml layout. Below is the code

package abhiandroid.com.onpauseexample;

import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;

public class Second extends AppCompatActivity {

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        setContentView(R.layout.content_second);


    }

}

Step 5:

Make sure your Manifests file has both the activity listed in it. Below is the code of AndroidManifest.xml:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="abhiandroid.com.onpauseexample">

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity
            android:name=".MainActivity"
            android:label="@string/app_name"
            android:theme="@style/AppTheme.NoActionBar">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity
            android:name=".Second"
            android:label="@string/title_activity_second"
            android:theme="@style/AppTheme.NoActionBar"></activity>
    </application>

</manifest>

Output:Step 1:

Now run the App in Android Virtual Device (AVD). You will see the below output screen:

Step 2:

Now click on the “Next Activity” button. You will notice toast message of onPause() method will display on the screen.

Step 3:

Now press back button then that activity (MainActivity) is in background will come in front i.e. onstart() and onResume() method will execute of background activity.

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Summary:

onPause() method is called when activity goes is in the background i.e. not visible to user. Our above example shows you how this happen.