I study broadcast messages. In the book D.N. Kolisnichenko - "programming for android" is an example where by pressing the camera button the service is called. But he does not work for me. What is the problem? I thought in the file manifest, so where I just didn’t poke anything there doesn’t work. Or I do not know what exactly the camera button is (either physically or on the display) or I don’t understand what’s wrong. Here is the code from the example:

MainActivity.java //...................................................... import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.content.Intent; import android.content.IntentFilter; public class MainActivity extends AppCompatActivity { MyReceiver iReceiver = new MyReceiver(); @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); IntentFilter iFilter = new IntentFilter(Intent.ACTION_CAMERA_BUTTON); iFilter.addAction(Intent.ACTION_CAMERA_BUTTON); registerReceiver(iReceiver, iFilter); } @Override protected void onDestroy() { unregisterReceiver(iReceiver); super.onDestroy(); } } //..................................................... MyReceiver.java //.................................................... 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 rcvContext, Intent rcvIntent) { String action = rcvIntent.getAction(); if (action.equals(Intent.ACTION_CAMERA_BUTTON)) { rcvContext.startService(new Intent(rcvContext, MyService.class)); } } } //.......................................................... MyService.java //.......................................................... import android.app.Service; import android.content.Intent; import android.os.IBinder; import android.widget.Toast; public class MyService extends Service { @Override public IBinder onBind(Intent arg0) { return null; } @Override public void onCreate() { super.onCreate(); Toast.makeText(this,"Service started...", Toast.LENGTH_LONG).show(); } @Override public void onDestroy() { super.onDestroy(); Toast.makeText(this, "Service destroyed...", Toast.LENGTH_LONG).show(); } } 
 <?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.ivarious.myapplication"> <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" /> <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" /> <action android:name="android.intent.action.CAMERA_BUTTON" /> </intent-filter> </activity> <receiver android:name=".MyReceiver"> <intent-filter> <action android:name="android.intent.action.BOOT_COMPLETED" /> <action android:name="android.intent.action.CAMERA_BUTTON" /> </intent-filter> <service android:name=".MyService"></service> <action android:name="android.intent.action.CAMERA_BUTTON" /> <action android:name="android.intent.extra.KEY_EVENT" /> <uses-permission android:name="android.permission.CAMERA" /> <uses-feature android:name="android.hardware.camera" /> </receiver> </application> </manifest>

  • Maybe you mean the button in your application, after clicking on which you need to open the camera? Then in onClick write her Intent intent = new Intent(ACTION_CAMERA_BUTTON, null); startActivity(intent); Intent intent = new Intent(ACTION_CAMERA_BUTTON, null); startActivity(intent); - VAndrJ
  • That is not like. at the end of the chapter, writes the following: “The receiver analyzes the received action. If the camera button is pressed, the service (service) MyService described in the file MyService.java will be started. The code for this file is shown in Listing 11.6. You need to change only the first line, it should look like like this: package com.samples.my_receiver; In this chapter, we looked at creating streams, services, and broadcast receivers. In the next we will talk about creating animation in Android applications. " - PeteGr

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