Know your app foreground or background in android

Hello friends
Today we are learn about how to detect our app background or foreground so lets start and enjoying this code.

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: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:textSize="25dp"
        android:layout_centerHorizontal="true"
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/first" />

    <Button
        android:layout_centerInParent="true"
        android:text="Next"
        android:elevation="4dp"
        android:id="@+id/FirstBtn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_marginBottom="23dp"
        tools:ignore="NotSibling" />

</RelativeLayout>

MainActvity.java


package com.example.user.actvitylifecycle;

import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageButton;

public class MainActivity extends BaseActivity {

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

((Button) findViewById(R.id.FirstBtn))
.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View v) {
startActivity(new Intent(getApplicationContext(),
SecondActvity.class));
}
});
}

}

second_activity.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: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=".SecondActvity" >

    <TextView
        android:textSize="25dp"
        android:layout_centerHorizontal="true"
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/second" />

    <Button
        android:layout_centerInParent="true"
        android:text="Next.."
        android:elevation="4dp"
        android:id="@+id/SecondBtn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_marginBottom="23dp"
        tools:ignore="NotSibling" />

</RelativeLayout>


third_activity.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: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=".ThirdActivity" >

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/action_settings" />

</RelativeLayout>

SecondActivity.java

package com.example.user.actvitylifecycle;

import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class SecondActvity extends BaseActivity {

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.second);
((Button) findViewById(R.id.SecondBtn))
.setOnClickListener(new View.OnClickListener() {

@Override
public void onClick(View v) {
startActivity(new Intent(getApplicationContext(),
ThirdActivity.class));
}
});
}

}

ThirdActivity.java

package com.example.user.actvitylifecycle;

import android.annotation.TargetApi;
import android.os.Build;
import android.os.Bundle;
import android.view.Menu;

public class ThirdActivity extends BaseActivity {

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.second);
}


@Override
public boolean onCreateOptionsMenu(Menu menu) {
super.onCreateOptionsMenu(menu);

getActionBar().setDisplayHomeAsUpEnabled(true);
getActionBar().setTitle(getString(R.string.action_settings));
return true;
}
}

BaseActvity.java

package com.example.user.actvitylifecycle;

import android.content.pm.ActivityInfo;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.widget.Toast;

public abstract class BaseActivity extends AppCompatActivity {

    protected static final String TAG = BaseActivity.class.getName();

    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
    }

    public static boolean isAppWentToBg = false;
    public static boolean isWindowFocused = false;
    public static boolean isBackPressed = false;

    @Override
    protected void onStart() {
        Log.d(TAG, "onStart isAppWentToBg " + isAppWentToBg);
        applicationWillEnterForeground();
        super.onStart();
    }

    private void applicationWillEnterForeground() {
        if (isAppWentToBg) {
            isAppWentToBg = false;
            Toast.makeText(getApplicationContext(), "App is in foreground", Toast.LENGTH_SHORT).show();
        }
    }

    @Override
    protected void onStop() {
        super.onStop();
        Log.d(TAG, "onStop ");
        applicationdidenterbackground();
    }

    public void applicationdidenterbackground() {
        if (!isWindowFocused) {
            isAppWentToBg = true;
            Toast.makeText(getApplicationContext(),"App is Going to Background", Toast.LENGTH_SHORT).show();
        }
    }

    @Override
    public void onBackPressed() {
        if (this instanceof MainActivity) {
        } else {
            isBackPressed = true;
        }
        Log.d(TAG,"onBackPressed " + isBackPressed + ""+ this.getLocalClassName());
        super.onBackPressed();
    }

    @Override
    public void onWindowFocusChanged(boolean hasFocus) {
        isWindowFocused = hasFocus;
        if (isBackPressed && !hasFocus) {
            isBackPressed = false;
            isWindowFocused = true;
        }
        super.onWindowFocusChanged(hasFocus);
    }

}

AndroidManifest.xml

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

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

    package="com.example.user.actvitylifecycle">

    <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">

            <intent-filter>

                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />

            </intent-filter>

        </activity>

        <activity android:name=".SecondActvity"></activity>

        <activity android:name=".ThirdActivity"></activity>

    </application>

</manifest>

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