Develop Reference

Not able to get actions to fire USER_PRESENT or SCREEN_ON Android Emulator

I want to know when a user has turned their phone on eg. click the power button/possibly actually unlocked their phone. The ultimate goal is to update a widget's display after calling an API vs. using scheduled updates.
The issue is I've been scouring threads and I have not been able to get my logs to fire in Logcat. I have tried both Receiver and Service methods. Is what Is what I am attempting possible?
I have also tried setting the READ_PHONE_STATE permission in the manifest.
Some code context of what I have:
Manifest:
<receiver android:name=".CustomBroadcastRecveiver">
<intent-filter>
<action android:name="android.intent.action.USER_PRESENT">
<action android:name="android.intent.action.SCREEN_ON">
</intent-filter>
</receiver>
Optional service in manifest that I tried:
<service android:naem=".CustomService"/>
CustomBroadcastReceiver:
public class CustomBroadcastReceiver extends BroadcastReceiver {
#Override
public void onReceive(Context context, Intent intent) {
Log.i("MyTag", "broadcast receive"); // this does not run
if (intent.getAction().equals(Intent.ACTION_USER_PRESENT) {
Log... // this doesn't run, same for ACTION_SCREEN_ON that would be in a new if block
}
}
}
I'm open to other alternatives. I can provide more context if necessary. I can expand more on my service implementation if that is the way to go assuming what I'm after is possible.
Edit
To add more context on how I used Elletlar's answer
In my MainActivity I added:
private static Context context;
Then inside onCreate:
context = getApplicationContext();
// instantiate my specific receiver
// set the code from answer below
Note: I am API 29 if it makes any difference.

From the "android.intent.action.SCREEN_ON" docs, "You cannot receive this through components declared in manifests, only by explicitly registering for it with
Context#registerReceiver(BroadcastReceiver, IntentFilter).
Example of registering explicitly:
myReceiver = new MyReceiver();
IntentFilter filter = new IntentFilter();
filter.addAction(Intent.ACTION_SCREEN_OFF);
filter.addAction(Intent.ACTION_SCREEN_ON);
registerReceiver(myReceiver, filter);

Listen for user changed event (multi user device)

I've an app that starts itself if the phone is booted. A user told me his phone is used by two people, one of them is using my app and one not.
So I need some event to listen to when the user is switched, so that I can start my apps service if the correct user is using the phone. Anything I can use for that?
Edit
I'm listening to the boot event with a broadcast receiver registered in the manifest, so I know what this is. But I could not find anything suitable for switching users on a device

You need to look for something called BroadcastReciever in android. They are used to capture events such as camera click, phone booting up, screen unlocked etc... These events have a callback called onReceive where you can implement your login.
It's quite easy and you can Google it.
In your manifest:
<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
In your application element (be sure to use a fully-qualified [or relative] class name for your BroadcastReceiver):
<receiver android:name="com.example.MyBroadcastReceiver">
<intent-filter>
<action android:name="android.intent.action.BOOT_COMPLETED" />
</intent-filter>
</receiver>
In MyBroadcastReceiver.java:
package com.example;
public class MyBroadcastReceiver extends BroadcastReceiver {
#Override
public void onReceive(Context context, Intent intent) {
Intent startServiceIntent = new Intent(context, MyService.class);
context.startService(startServiceIntent);
}
}

I want to use broadcast receiver even if the app is closed

I am trying to show a toast message when receiving an incoming call/outgoing call.
The receiver is not working if the app is closed.
I do not want to use Service. Please help me out.
'I am using the below receiver code'
public class CallReceiver extends BroadcastReceiver
{
#Override
public void onReceive(Context context, Intent intent) {
if (isConnected(context)) {
if (intent.getStringExtra(TelephonyManager.EXTRA_STATE).equals(TelephonyManager.EXTRA_STATE_RINGING)) {
Toast.makeText(context, "Call in progress", Toast.LENGTH_LONG).show();
}
}
}
'This is receiver registered in manifest'
<receiver android:name="com.example.android.testapplication.CallReceiver">
<intent-filter>
<action android:name="android.intent.action.PHONE_STATE"></action>
<action android:name="android.intent.action.new_outgoing_call"></action>
</intent-filter>
</receiver>

Try adding the phone state permission to your manifest.
<uses-permission android:name="android.permission.READ_PHONE_STATE"/>

By default when you register a BroadCastReceiver with AndroidOS that means Receiver always work as the Service part even your application is not working, since you do not have to worry about this problem.
I think the problem is the way you register you Receiver was not correct.
With in/out coming call you should use PhoneStateListener which has overrided method onCallStateChanged. You can use 3 states over there.
Maybe this example will be helpful.

Close the application if internet connection is lost

I want to check the internet connection constantly and close the app with a warning message if connection is lost. How can i manage to do that?

Check Internet Connectivity via Phone Background service (such as AlermManager Service) then close the app if no connection found.
thanks.

close the app
Don't try to kill the process and its not recommended way of closing application. Either call finish() on all activities or call moveTaskToBack(true).
For Solution
Here you go.
You will need to register for and handle BroadCastReceiver android.net.conn.CONNECTIVITY_CHANGE
Step 1
Include following permission in manifest
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
Step2
Let Android know which class will be register for BroadCast Receiver.
<receiver android:name="ConnectivityReceiver_package_name.ConnectivityReceiver">
<intent-filter>
<action android:name="android.net.conn.CONNECTIVITY_CHANGE" />
</intent-filter>
</receiver>
Step 3
Put your logic for various Network States.
public class ConnectivityReceiver extends BroadcastReceiver {
#Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
boolean noConnectivity = intent.getBooleanExtra(ConnectivityManager.EXTRA_NO_CONNECTIVITY,false);
if(noConnectivity){
//Show Warning Message
//Close Application the way i suggested
}
}
}

Broadcast receiver for Silent Mode detection? [duplicate]

I'm using a service. In that service my code should get executed when the user changes to silent mode, i.e. as soon as the user changes to silent mode, my code needs to get executed.
How can I do this?

You don't want use a service. Instead you want to use a BroadcastReciever that filters for the android.media.RINGER_MODE_CHANGED Intent.
You might want to take a look at this project as it deals with the phone being silenced. It probably has some source code that will be useful to you.

You can register to listen to the BroadcastAudioManager.RINGER_MODE_CHANGED_ACTION.

In your manifest file you can register the intent like this
<intent-filter>
<action android:name="android.media.RINGER_MODE_CHANGED" />
</intent-filter>
And then recieve the intent at method
public void onReceive(Context context, Intent intent)
of class that extends BroadcastReceiver class