Added explicit broadcast receivers and fixed a bug in dynamic receivers with initalStickyBroadcast

Author: NickAsher

BroadcastReceivers/.idea/gradle.xml

@@ -34,6 +34,10 @@
             </intent-filter>
         </receiver>
 
+        <receiver android:name=".receivers.StaticExplicit_4_BroadcastReceiver"
+            android:exported="true">
+        </receiver>
+
     </application>
 
 </manifest>

BroadcastReceivers/app/src/main/AndroidManifest.xml

@@ -2,6 +2,7 @@
 
 import androidx.appcompat.app.AppCompatActivity;
 
+import android.content.ComponentName;
 import android.content.Intent;
 import android.content.IntentFilter;
 import android.net.ConnectivityManager;
@@ -29,7 +30,7 @@ protected void onStart() {
 
         //Registering the second receiver
         IntentFilter filter = new IntentFilter() ;
-        filter.addAction("android.media.RINGER_MODE_CHANGED");  // you can add multiple action here i.e. listen to multiple intent filters
+        filter.addAction(ConnectivityManager.CONNECTIVITY_ACTION);  // you can add multiple action here i.e. listen to multiple intent filters
         registerReceiver(dynamicImplicit2NetworkReceiver, filter) ;
 
 
@@ -59,4 +60,15 @@ public void onClick_Btn3_sendCustomBroadCast(View v){
 
 
     }
+
+    public void onClick_Btn4_ExplicitBroadcastReceiver(View v){
+        String packageName = "in.rafique.androidbasics.broadcastreceivers" ;
+        String broadcastReceiverFullName = "in.rafique.androidbasics.broadcastreceivers.receivers.StaticExplicit_4_BroadcastReceiver" ;
+        // when we do new Intent(context, className.java) we are stll doing the following thing
+        // the context gives package name, and the class name gives class path
+        ComponentName componentName = new ComponentName(packageName, broadcastReceiverFullName) ;
+        Intent intent = new Intent() ;
+        intent.setComponent(componentName) ;
+        sendBroadcast(intent);
+    }
 }

BroadcastReceivers/app/src/main/java/in/rafique/androidbasics/broadcastreceivers/MainActivity.java

@@ -10,9 +10,20 @@
 public class DynamicImplicit_2_NetworkBroadcastReceiver extends BroadcastReceiver {
     @Override
     public void onReceive(Context context, Intent intent) {
-        if("android.media.RINGER_MODE_CHANGED".equals(intent.getAction())){
-            Log.d("jdfslj =>", "I am inside onReceive") ;
-            Toast.makeText(context, "Ringer Changed", Toast.LENGTH_SHORT).show();
+        // Registering Dynamically sends an initial sticky broadcast, every time app resumes, opens
+        // we don't want that, so bypassing the initial-sticky-broadcast here using isInitialStickyBroadcast()
+        if(!isInitialStickyBroadcast()){
+
+
+            if(ConnectivityManager.CONNECTIVITY_ACTION.equals(intent.getAction())){
+                boolean hasNoConnectivity = intent.getBooleanExtra(ConnectivityManager.EXTRA_NO_CONNECTIVITY, false) ;
+                if(hasNoConnectivity){
+                    Toast.makeText(context, "NOOO, network is gone my lord", Toast.LENGTH_SHORT).show();
+                }else{
+                    Toast.makeText(context, "YAYYY, the network is back my Lord", Toast.LENGTH_SHORT).show();
+                }
+            }
         }
+
     }
 }

BroadcastReceivers/app/src/main/java/in/rafique/androidbasics/broadcastreceivers/receivers/DynamicImplicit_2_NetworkBroadcastReceiver.java

@@ -0,0 +1,14 @@
+package in.rafique.androidbasics.broadcastreceivers.receivers;
+
+import android.content.BroadcastReceiver;
+import android.content.Context;
+import android.content.Intent;
+import android.widget.Toast;
+
+public class StaticExplicit_4_BroadcastReceiver extends BroadcastReceiver {
+    @Override
+    public void onReceive(Context context, Intent intent) {
+        // i don't right now know when to use explicit broadcast receiver
+        Toast.makeText(context, "This is from explicit broadcast receiver", Toast.LENGTH_SHORT).show();
+    }
+}

BroadcastReceivers/app/src/main/java/in/rafique/androidbasics/broadcastreceivers/receivers/StaticExplicit_4_BroadcastReceiver.java

@@ -57,33 +57,53 @@
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:orientation="horizontal"
-        android:padding="16dp"
         >
         <Button
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:text="Send Custom Broadcast"
+            android:textSize="8sp"
             android:onClick="onClick_Btn3_sendCustomBroadCast"
+            android:layout_marginTop="16dp"
             />
 
+        <TextView
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:text="3. This button sends a custom broadcast with intent filter of yoloman.super.duper.myFilter.MY_ACTION . I have also declared a broadcast receiver that takes in this intent filter and can catch that. So when you click this button, my receiver will catch that braodcast and will show a toast message"
+            android:layout_gravity="top"
+            android:gravity="top"
+            android:padding="8dp"
+            android:layout_margin="8dp"
+            />
+
+
     </LinearLayout>
 
     <LinearLayout
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:orientation="horizontal"
-        android:padding="16dp"
         >
         <Button
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
-            android:text="Open MyJobIntentService"
-            android:onClick="openMyJobIntentService"
-            android:layout_margin="16dp"
+            android:text="Explicit Broadcast"
+            android:onClick="onClick_Btn4_ExplicitBroadcastReceiver"
+            android:layout_marginTop="16dp"
+            android:textSize="8sp"
             />
 
 
-
+        <TextView
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:text="4. This button explicitly calls the broadcast receiver by passing the package and the class name. You can also do this for calling broadcast receivers of different apps by passsing their package name and their broadcast receiver name. just make sure that the receiver in the manifest is exported=true because when you dont put intent filter, the value of exported becomes false"
+            android:layout_gravity="top"
+            android:gravity="top"
+            android:padding="8dp"
+            android:layout_margin="8dp"
+            />
 
 
     </LinearLayout>