Develop Reference

How to Pass Data From a BroadcastReceiver to an Activity in Android

I am working on my first Android app, which is a paging device. It will intercept a SMS message from a certain number with a certain content in it, display that and then allow the user to send a pre-defined reply back to that same number. I have gathered up code snippets from numerous sources (including stackoverflow of course) but I haven't yet got it working.
My file structure is as shown here
The part I am struggling with is SmsBroadcastReceiver and ReceiveAlert, which should display the content of the SMS and has a button to initiate the reply.
SmsBroadcastReceiver.java looks like this:
package com.example.alert6;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.provider.Telephony;
import android.telephony.SmsMessage;
public class SmsBroadcastReceiver extends BroadcastReceiver {
public static final String EXTRA_MESSAGE = "com.example.alert6.MESSAGE";
#Override
public void onReceive(Context context, Intent intent) {
String smsSender = "";
String smsBody = "";
for (SmsMessage smsMessage : Telephony.Sms.Intents.getMessagesFromIntent(intent)) {
smsSender = smsMessage.getOriginatingAddress();
smsBody = smsMessage.getMessageBody();
}
if (smsSender.equals("+420775367297")) {
if (smsBody.contains("Test")) {
intent.putExtra(EXTRA_MESSAGE, smsBody);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK); // adding this flag starts the new Activity in a new Task
context.startActivity();
}
}
}
}
ReceiveAlertActivity.java is this:
package com.example.alert6;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;
import android.Manifest;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.view.View;
import android.widget.TextView;
public class ReceiveAlertActivity extends AppCompatActivity {
private static final int SMS_PERMISSION_CODE = 101;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_receive_alert);
}
// Get the Intent that started this activity and extract the string
Intent intent = getIntent();
String taskingalert = intent.getStringExtra(SmsBroadcastReceiver.EXTRA_MESSAGE);
// Capture the layout's TextView and set the string as its text
TextView receivedAlert = findViewById(R.id.receivedAlert);
receivedAlert.setText(taskingalert);
public boolean respond(View view) {
if (!hasReadSmsPermission()) {
requestReadAndSendSmsPermission();
return false;
}
Intent intent = new Intent(this, SendResponseActivity.class);
startActivity(intent);
return false;
}
/**
* Runtime permission shenanigans
*/
private boolean hasReadSmsPermission() {
return (ContextCompat.checkSelfPermission(ReceiveAlertActivity.this,
Manifest.permission.READ_SMS) == PackageManager.PERMISSION_GRANTED) &&
(ContextCompat.checkSelfPermission(ReceiveAlertActivity.this,
Manifest.permission.RECEIVE_SMS) == PackageManager.PERMISSION_GRANTED) &&
(ContextCompat.checkSelfPermission(ReceiveAlertActivity.this,
Manifest.permission.SEND_SMS) == PackageManager.PERMISSION_GRANTED);
}
private void requestReadAndSendSmsPermission() {
ActivityCompat.requestPermissions(ReceiveAlertActivity.this, new String[]{Manifest.permission.READ_SMS, Manifest.permission.RECEIVE_SMS, Manifest.permission.SEND_SMS},
SMS_PERMISSION_CODE);
}
}
And the manifest is this:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
package="com.example.alert6">
<uses-permission android:name="android.permission.RECEIVE_SMS" />
<uses-permission android:name="android.permission.READ_SMS" />
<uses-permission android:name="android.permission.SEND_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/Theme.Alert6">
<activity
android:name=".SendResponseActivity"
android:parentActivityName=".ReceiveAlertActivity">
</activity>
<activity
android:name=".ReceiveAlertActivity"
android:parentActivityName=".MainActivity">
</activity>
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<receiver
android:name=".SmsBroadcastReceiver"
android:enabled="true"
android:exported="true"
tools:ignore="Instantiatable">
<intent-filter android:priority="999" >
<action android:name="android.provider.Telephony.SMS_RECEIVED" />
</intent-filter>
</receiver>
</application>
</manifest>
Android Studio is showing errors in SmsBroadcastReceiver and ReceiveAlertActivity but not giving enough information to resolve them.
In SmsBroadcastReceiver, it tells me it cannot resolve method 'startActivity()'. Something needs to go in the brackets, but what?
In ReceiveAlertActivity the problems revolve around receivedalert and taskingalert. It cannot resolve setText because taskingalert is an unknown class. Obviously it's not a class, it's a string so I'm doing something wrong, but what?
Sorting out these problems may not be the end. At the moment I can't test if the app works because the build fails due to the above. Then if I get this lot working, I have some other challenges, like waking up the screen and playing a sound the broadcast receiver is triggered, and stopping the sound when the button is pressed.

You can use an Observable object in your BroadcastReceiver to store the piece of information you want to send and implement the Observer interface in your Activity so that it will be warned of every change occuring to the Observable object.

BroadcastReceiver for Incoming calls in android doesn't work

I'm trying to develop android app for that can record phone calls. So, in the initial step, I've to see if BroadcastReceiver is getting fired or not.
I've added permissions, receiver tag in AndroidManifest file. I'm testing on OnePlus X. Activity is gets started but BroadcastReceiver doesn't get fired when I get call. What's going wrong here?
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.myapp">
<uses-permission android:name="android.permission.READ_PHONE_STATE" />
<application
android:allowBackup="true"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:supportsRtl="true"
android:theme="#style/AppTheme">
<activity
android:name="com.example.myapp.MainActivity"
android:label="#string/app_name"
android:screenOrientation="portrait">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<receiver android:name=".PhoneStateReceiver">
<intent-filter>
<action android:name="android.intent.action.PHONE_STATE" />
</intent-filter>
</receiver>
</application>
</manifest>
PhoneStateReceiver.Java
package com.example.myapp;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.telephony.TelephonyManager;
import android.widget.Toast;
public class PhoneStateReceiver extends BroadcastReceiver {
#Override
public void onReceive(Context context, Intent intent) {
try {
System.out.println("Receiver start");
String state = intent.getStringExtra(TelephonyManager.EXTRA_STATE);
String incomingNumber = intent.getStringExtra(TelephonyManager.EXTRA_INCOMING_NUMBER);
if(state.equals(TelephonyManager.EXTRA_STATE_RINGING)){
Toast.makeText(context,"Incoming Call State",Toast.LENGTH_SHORT).show();
Toast.makeText(context,"Ringing State Number is -"+incomingNumber,Toast.LENGTH_SHORT).show();
}
if ((state.equals(TelephonyManager.EXTRA_STATE_OFFHOOK))){
Toast.makeText(context,"Call Received State",Toast.LENGTH_SHORT).show();
}
if (state.equals(TelephonyManager.EXTRA_STATE_IDLE)){
Toast.makeText(context,"Call Idle State",Toast.LENGTH_SHORT).show();
}
}
catch (Exception e){
e.printStackTrace();
}
}
}

The permission READ_PHONE_STATE is a dangerous permission, if you are on a marshmallow device you must request runtime permission else your broadcast receiver will not work neither it will throw an error.
That is the most likely the cause of issue from your code because you have correctly registered in the Intent filter other than that there is nothing wrong as it is just a broadcast receiver and should work, i.e get called by the Android system.

android.content.ActivityNotFoundException: No Activity found to handle Intent

please help , when i run the app, the app launch a Fatal Error im learning
just i create a instat with a call but not run, (sorry for my english)
.......................................................................
my manifest:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.android.octa.appprueba3">
<uses-permission android:name="android.permission.CALL_PHONE" />
<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" />
<category android:name="android.intent.category.APP_CONTACTS" />
</intent-filter>
</activity>
<activity android:name=".SecondActivity"></activity>
</application>
</manifest>
my code:
public class SecondActivity extends AppCompatActivity {
private EditText editPhoneText;
private ImageButton imageCallButton;
private final int PHONE_CALL_CODE = 100;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_second);
editPhoneText = (EditText) findViewById(R.id.editTextPhone);
imageCallButton = (ImageButton) findViewById(R.id.imageCallButton1);
imageCallButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
implicito();
}
});
}
public void implicito(){
Intent intent = new Intent(Intent.ACTION_DIAL, Uri.parse("Tel: 9999999" ));
startActivity(intent);
}
}

You may want to check whether your device can handle your intent by doing this:
PackageManager packageManager = getPackageManager();
if (intent.resolveActivity(packageManager) != null) {
startActivity(intent);
} else {
Log.d(TAG, "Cannot handle this intent");
}
What's more, if you are placing a call like so, there is NO need to declare the permission in your manifest:
<uses-permission android:name="android.permission.CALL_PHONE" />
Because you are not directly calling someone within your app. You are actually transferring the "duty" to other apps which can handle your intent to call. This doesn't need a permission.
To directly make a call within your app, the intent should be Intent.ACTION_CALL, which needs the permission you declared.
Hope this will help.

There is no activity on your device that handles ACTION_DIAL for a Tel: scheme. Try:
Intent intent = new Intent(Intent.ACTION_DIAL, Uri.parse("tel:9999999" ));
Case and whitespace are important when assembling a Uri.
Also note that even my revised Intent will not work on all devices, such as on an Android tablet that lacks a dialer.

read received sms in a toast when sms is received

i want to design an android app which show the received sms in a android toast.
i am using android studio with android 5.0 lolipop to compile.
FOLLOWING are steps which i do to create app. ( all steps are from this site)
create a new android project
enter aplication name and location
select minimum sdk as 'android 2.0'
click on add 'no activity'
create an SMSReceiver.java file under
android->app->java->com.example......->SMSReceiver.java
with following code
package com.example.vaibhav.savemev1;
import java.lang.*;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.telephony.SmsManager;
import android.telephony.SmsMessage;
import android.util.Log;
import android.widget.Toast;
public class SMSReceiver extends BroadcastReceiver {
// Get the object of SmsManager
final SmsManager sms = SmsManager.getDefault();
public void onReceive(Context context, Intent intent) {
// Retrieves a map of extended data from the intent.
final Bundle bundle = intent.getExtras();
try {
if (bundle != null) {
final Object[] pdusObj = (Object[]) bundle.get("pdus");
for (int i = 0; i < pdusObj.length; i++) {
SmsMessage currentMessage = SmsMessage.createFromPdu((byte[]) pdusObj[i]);
String phoneNumber = currentMessage.getDisplayOriginatingAddress();
String senderNum = phoneNumber;
String message = currentMessage.getDisplayMessageBody();
// Show Alert
int duration = Toast.LENGTH_LONG;
Toast toast = Toast.makeText(context,
"senderNum: " + senderNum + ", message: " + message, duration);
toast.show();
} // end for loop
} // bundle is null
} catch (Exception e) {
Log.e("SmsReceiver", "Exception smsReceiver" + e);
}
}
}
AndroidManifest.xml code is...
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.vaibhav.savemev1">
<uses-permission android:name="android.permission.RECEIVE_SMS"/>
<uses-permission android:name="android.permission.READ_SMS"/>
<application android:allowBackup="true" android:label="#string/app_name"
android:icon="#mipmap/ic_launcher" android:theme="#style/AppTheme">
<receiver android:name=".SMSReceiver">
<intent-filter>
<action android:name="android.provider.Telephony.SMS_RECEIVED"/>
</intent-filter>
</receiver>
</application>
click on 'android AVD' and 'wipe' out all data in android virtual device.
click on play button and in edit configuration window
->Activity->'do not launch Activity' radio button. click on it
and ok
chose device-> launch that device which data was wiped earlier
Still no success. Am i doing anythig wrong? The App is compiling successfully, but it does not show any toast when SMS is received.

For a good answer: could you say how do you test? Do you use simulator and simulate SMS? If that so, you will need to set Data_SMS_RECEIVED in the AndroidManifest.
<receiver android:name=".SMSReceiver">
<intent-filter>
<action android:name="android.provider.Telephony.SMS_RECEIVED"/>
</intent-filter>
<!-- extent another intent-filter -->
<intent-filter>
<action android:name="android.intent.action.DATA_SMS_RECEIVED" />
<category android:name="android.intent.category.DEFAULT" />
<data android:scheme="sms" />
<data android:host="localhost" />
<data android:host="16984" />
</intent-filter>
</receiver>
With this you can use ddms or simply telnet to send a SMS to the virtual Device. like so:
telnet localhost 16984
sms send <Hello World>
text with brackets should appear. This just works with Virtual Devices. On Device the Telephony SMS_RECEIVED should do the trick.
If it not work, you should use logcat and post information form there.

Android : sms receiver is not working

I am writing an sms receiver android code but it is not working.
It compiles will but when I get an sms it did not displayed as supposed to be when using Toast.
This is my code:
package com.example.homecontrolingbysms;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.telephony.SmsMessage;
import android.widget.Toast;
public class SmsReceiver extends BroadcastReceiver{
#Override
public void onReceive(Context context, Intent intent)
{
//---get the SMS message passed in---
Bundle bundle = intent.getExtras();
SmsMessage[] msgs = null;
String messageReceived = "";
if (bundle != null)
{
//---retrieve the SMS message received---
Object[] pdus = (Object[]) bundle.get("pdus");
msgs = new SmsMessage[pdus.length];
for (int i=0; i<msgs.length; i++){
msgs[i] = SmsMessage.createFromPdu((byte[])pdus[i]);
messageReceived +="From "+ msgs[i].getOriginatingAddress();
messageReceived+=" : ";
messageReceived += msgs[i].getMessageBody().toString();
messageReceived += "\n";
}
//---display the new SMS message---
Toast.makeText(context, messageReceived, Toast.LENGTH_SHORT).show();
}
}
}
I also posted manifest to make sure all important parts of code are available
manifest.xml:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.homecontrolingbysms"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="17" />
<uses-permission android:name="android.permission.SEND_SMS"/>
<uses-permission android:name="android.permission.RECEIVE_SMS"/>
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name="com.example.homecontrolingbysms.MainActivity"
android:label="#string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name="com.example.homecontrolingbysms.Door"
android:label="#string/app_name" >
</activity>
<activity
android:name="com.example.homecontrolingbysms.Window"
android:label="#string/app_name" >
</activity>
<activity
android:name="com.example.homecontrolingbysms.Light"
android:label="#string/app_name" >
</activity>
</application>
</manifest>

Register smsreceiver by adding below code in menifest file
<receiver android:name="com.shreymalhotra.smsreceiver.SmsReceiver">
<intent-filter>
<action android:name="android.provider.Telephony.SMS_RECEIVED" />
</intent-filter>
</receiver>
This links may help you.
Receiving SMS on Android App
http://shreymalhotra.me/blog/tutorial/receive-sms-using-android-broadcastreceiver-inside-an-activity/
Please check it.

if you want to receive some broadcasts , blew things must be done.
1. In the manifest.xml ,you must declare your receiver with the intent filter
exp:
2. if the broadcast that you want to receive is ordered, you must make sure your priority.
android:priority="1000"

I think your manifest looks okay; the problem is with the line:
Mistake is in this part I think can you change this
Bundle bundle = intent.getExtras();
SmsMessage[] msgs = null;
String messageReceived = "";
if (bundle != null)
to something like this
public void onReceive(Context context, Intent intent) {
Log.i(TAG, "Intent recieved: " + intent.getAction());
intent.getAction().equals(ACTION) {
Bundle bundle = intent.getExtras();
if (bundle != null) {
Object[] pdus = (Object[])bundle.get("pdus");
(you need to do an object comparison on the action string, or just do no comparison), in your manifest file you have misspelled SMS_RECEIVED.