Hands-on Lab Practice

Let’s begin with secured Broadcast intent handling. We are going to use the theories we have discussed on the prelab section to secure the intent’s from malicious application. To begin go to your Android Studio and create a new project name it “InterAppSender” see the image below

//Copy and Paste following code in MainActivity.java

//MainActivity.java

package com.example.interappsender;

import androidx.appcompat.app.AppCompatActivity;

import android.content.BroadcastReceiver;

import android.content.Context;

import android.content.Intent;

import android.content.IntentFilter;

import android.content.pm.PackageManager;

import android.os.Build;

import android.os.Bundle;

import androidx.core.app.ActivityCompat;

import androidx.core.content.ContextCompat;

import android.view.View;

import android.widget.EditText;

public class MainActivity extends AppCompatActivity {

private EditText name, password;

private Context context;

public MainActivity(){

this.context = MainActivity.this;

}

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

name = findViewById(R.id.name);

password = findViewById(R.id.password);

MainActivity.this.registerReceiver(new BroadcastReceiver() {

@Override

public void onReceive(Context context, Intent intent) {

Bundle bundle = intent.getExtras();

String name = bundle.getString("userName");

String password = bundle.getString("password");

Intent show = new Intent(MainActivity.this, com.example.interappsender.ShowResultOfReceiver.class);

show.putExtra("name", name);

show.putExtra("password", password);

startActivity(show);

}

}, new IntentFilter("com.example.CUSTOM_ACTION"), "example.com.interappsenderv4.permission.CUSTOM_PERMISSION", null);

}

public void sendData(View view) {

int permission = Build.VERSION.SDK_INT>=23 ? ActivityCompat.checkSelfPermission(context,

com.example.interappsender.Manifest.permission.CUSTOM_PERMISSION):

ContextCompat.checkSelfPermission(context,com.example.interappsender.Manifest.permission.CUSTOM_PERMISSION);

if (permission != PackageManager.PERMISSION_DENIED){

CustomDialog dialog = new CustomDialog(context);

String title = "Permission";

String message = "Need to Allow this permission to send Data.";

String positiveButton = "Accept";

String negativeButton = "Deny";

dialog.showDialog(title,message,positiveButton,negativeButton);

dialog.setCustomDialogListener(new AppCustomListener() {

@Override

public void didPressedPositiveButton() {

Bundle bundle = new Bundle();

bundle.putString("userName",name.getText().toString());

bundle.putString("password",password.getText().toString());

Intent intent = new Intent("com.example.CUSTOM_ACTION");

intent.putExtras(bundle);

sendBroadcast(intent,"example.com.interappsender.permission.CUSTOM_PERMISSION");

}

});

}

}

}

//Copy and Paste Following code in AndroidManifest.xml

//AndroidManifest.xml

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

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

package="com.example.interappsender">

<application

android:allowBackup="true"

android:icon="@mipmap/ic_launcher"

android:label="@string/app_name"

android:supportsRtl="true"

android:theme="@style/Theme.Interappsender">

<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>

//Copy and Paste Following code in activity_main.xml

//activity_main.xml

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

<RelativeLayout 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="com.example.interappsender.MainActivity">

<TextView

android:id="@+id/name_text"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_alignParentTop="true"

android:layout_centerHorizontal="true"

android:layout_marginTop="95dp"

android:text="Username"

android:textSize="20dp"/>

<EditText

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:id="@+id/name"

android:layout_below="@+id/name_text"

android:layout_centerHorizontal="true"

android:ems="10"

android:background="#BED2CE"

android:layout_marginTop="5dp"

android:gravity="center"/>

<TextView

android:id="@+id/pass_text"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_alignEnd="@+id/name_text"

android:layout_below="@+id/name"

android:layout_marginTop="19dp"

android:text="Password"

android:textSize="20dp"/>

<EditText

android:id="@+id/password"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_below="@+id/pass_text"

android:layout_centerHorizontal="true"

android:layout_marginTop="5dp"

android:ems="10"

android:inputType="textPassword"

android:background="#BED2CE"

android:gravity="center"/>

<Button

android:id="@+id/send"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_alignStart="@+id/name_text"

android:layout_below="@+id/password"

android:layout_marginTop="10dp"

android:text="Send"

android:onClick="sendData"/>

</RelativeLayout>

Now select Analyze Project Files the select as following

Result