Read messages from the mobile and display it on the screen.


MainActivity.java

package com.example.assignment13;

import androidx.appcompat.app.AppCompatActivity;

import androidx.core.app.ActivityCompat;

import androidx.core.content.ContextCompat;

import android.content.ContentResolver;

import android.content.pm.PackageManager;

import android.database.Cursor;

import android.net.Uri;

import android.os.Bundle;

import android.view.View;

import android.widget.AdapterView;

import android.widget.ArrayAdapter;

import android.widget.ListView;

import android.widget.Toast;

import java.util.ArrayList;

public class MainActivity extends AppCompatActivity {

    private static MainActivity inst;

    ArrayList<String> smsMessagesList = new ArrayList<String>();

    ListView smsListView;

    ArrayAdapter arrayAdapter;

    public static MainActivity instance() {

        return inst;

    }

    @Override

    public void onStart() {

        super.onStart();

        inst = this;

    }

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        smsListView = (ListView) findViewById(R.id.SMSList);

        arrayAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, smsMessagesList);

        smsListView.setAdapter(arrayAdapter);

        if (ContextCompat.checkSelfPermission(getBaseContext(), "android.permission.READ_SMS") == PackageManager.PERMISSION_GRANTED) {

            // Todo : If Permission Granted Then Show SMS

            refreshSmsInbox();

        } else {

            // Todo : Then Set Permission

            final int REQUEST_CODE_ASK_PERMISSIONS = 123;

            ActivityCompat.requestPermissions(MainActivity.this, new String[]{"android.permission.READ_SMS"}, REQUEST_CODE_ASK_PERMISSIONS);

        }

    }

    private void refreshSmsInbox() {

        ContentResolver contentResolver = getContentResolver();

        Cursor smsInboxCursor = contentResolver.query(Uri.parse("content://sms/inbox"), null, null, null, null);

        int indexBody = smsInboxCursor.getColumnIndex("body");

        int indexAddress = smsInboxCursor.getColumnIndex("address");

        if (indexBody < 0 || !smsInboxCursor.moveToFirst()) return;

        arrayAdapter.clear();

        do {

            String str = "SMS From: " + smsInboxCursor.getString(indexAddress) +

                    "\n" + smsInboxCursor.getString(indexBody) + "\n";

            arrayAdapter.add(str);

        } while (smsInboxCursor.moveToNext());

    }

    public void updateList(final String smsMessage) {

        arrayAdapter.insert(smsMessage, 0);

        arrayAdapter.notifyDataSetChanged();

    }

    public void onItemClick(AdapterView<?> parent, View view, int pos, long id) {

        try {

            String[] smsMessages = smsMessagesList.get(pos).split("\n");

            String address = smsMessages[0];

            String smsMessage = "";

            for (int i = 1; i < smsMessages.length; ++i) {

                smsMessage += smsMessages[i];

            }

            String smsMessageStr = address + "\n";

            smsMessageStr += smsMessage;

            Toast.makeText(this, smsMessageStr, Toast.LENGTH_SHORT).show();

        } catch (Exception e) {

            e.printStackTrace();

        }

    }

}

activity_main.xml

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

<LinearLayout 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">

    <ListView

        android:id="@+id/SMSList"

        android:layout_width="wrap_content"

        android:layout_height="match_parent"

        android:cacheColorHint="#FFFFFF"

        tools:layout_editor_absoluteX="8dp"

        tools:layout_editor_absoluteY="8dp" />

</LinearLayout>

SMSBReceiver.java

import android.content.BroadcastReceiver;

import android.content.Context;

import android.content.Intent;

import android.os.Bundle;

import android.telephony.SmsMessage;

import android.widget.Toast;

import com.example.assignment13.MainActivity;

public class SMSBReceiver extends BroadcastReceiver {

    public static final String SMS_BUNDLE = "pdus";

    @Override

    public void onReceive(Context context, Intent intent) {

        Bundle intentExtras = intent.getExtras();

        if (intentExtras != null) {

            Object[] sms = (Object[]) intentExtras.get(SMS_BUNDLE);

            String smsMessageStr = "";

            for (int i = 0; i < sms.length; ++i) {

                SmsMessage smsMessage = SmsMessage.createFromPdu((byte[]) sms[i]);

                String smsBody = smsMessage.getMessageBody().toString();

                String address = smsMessage.getOriginatingAddress();

                smsMessageStr += "SMS From: " + address + "\n";

                smsMessageStr += smsBody + "\n";

            }

            Toast.makeText(context, smsMessageStr, Toast.LENGTH_SHORT).show();

            //this will update the UI with message

            MainActivity inst = MainActivity.instance();

            inst.updateList(smsMessageStr);

        }

    }

}

AndroidManifest.xml

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

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

    package="com.example.assignment13">

    <uses-permission android:name="android.permission.READ_SMS"/>

        <uses-permission android:name="android.permission.RECEIVE_SMS"/>

    <application

        android:allowBackup="true"

        android:icon="@mipmap/ic_launcher"

        android:label="@string/app_name"

        android:roundIcon="@mipmap/ic_launcher_round"

        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>

    </application>

</manifest>

Output

To download follow this link : Program 13