Mobile Application Development Practical 21

Question 1

Write a program to demonstrate all the system broadcast messages.

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Hello World!"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>

AndroidManifest.xml

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

    <application
        android:allowBackup="true"
        android:dataExtractionRules="@xml/data_extraction_rules"
        android:fullBackupContent="@xml/backup_rules"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/Theme.Practical21"
        tools:targetApi="31">
        <receiver
            android:name=".MyReceiver"
            android:enabled="true"
            android:exported="true">
            <intent-filter>
                <action android:name="android.intent.action.AIRPLANE_MODE"></action>
                <action android:name="android.intent.action.BATTERY_LOW"></action>
                <action android:name="android.intent.action.ACTION_POWER_CONNECTED"></action>
                <action android:name="android.intent.action.ACTION_POWER_DISCONNECTED"></action>
                <action android:name="android.intent.action.BATTERY_OKAY"></action>
            </intent-filter>
        </receiver>

        <activity
            android:name=".MainActivity"
            android:exported="true">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

MyReceiver.java

package com.example.practical21;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.widget.Toast;

public class MyReceiver extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
        // TODO: This method is called when the BroadcastReceiver is receiving
        if(intent.getAction()=="android.intent.action.AIRPLANE_MODE")
            Toast.makeText(context,"Airplane mode",Toast.LENGTH_LONG).show();
        if(intent.getAction()=="android.intent.action.BATTERY_LOW")
            Toast.makeText(context,"Battery Low",Toast.LENGTH_LONG).show();
        if(intent.getAction()=="android.intent.action.BATTERY_OKAY")
            Toast.makeText(context,"Battery okay",Toast.LENGTH_LONG).show();
        if(intent.getAction()=="android.intent.action.ACTION_POWER_CONNECTED")
            Toast.makeText(context,"Charging on",Toast.LENGTH_LONG).show();
        if(intent.getAction()=="android.intent.action.ACTION_POWER_DISCONNECTED")
            Toast.makeText(context,"Charger disconnected",Toast.LENGTH_LONG).show();

    }
}

MainActivity.java

package com.example.practical18;

import androidx.appcompat.app.AppCompatActivity;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;

public class MainActivity extends AppCompatActivity {
    EditText ed;
    Button b;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ed=findViewById(R.id.editText);
        b=findViewById(R.id.button);

        View.OnClickListener cl=new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                String url=ed.getText().toString();
                Intent i=new Intent(Intent.ACTION_VIEW);
                i.setData(Uri.parse(url));
                startActivity(i);
            }
        };
        b.setOnClickListener(cl);
    }
}