Receiver declared in AndroidManifest.xml.

PowerUtils.java added along with the isBatteryCharging() Method.

Author: chris-carneiro

app/src/main/AndroidManifest.xml

@@ -1,21 +1,28 @@
 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
-    package="net.opencurlybraces.android.projects.androidpractices" >
+    package="net.opencurlybraces.android.projects.androidpractices">
 
     <application
         android:allowBackup="true"
         android:icon="@drawable/ic_launcher"
         android:label="@string/app_name"
-        android:theme="@style/AppTheme" >
+        android:theme="@style/AppTheme">
         <activity
             android:name=".MainActivity"
-            android:label="@string/app_name" >
+            android:label="@string/app_name">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
 
                 <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
         </activity>
+        <!-- Battery charging status receiver -->
+        <receiver android:name=".receiver.PowerConnectionReceiver">
+            <intent-filter>
+                <action android:name="android.intent.action.ACTION_POWER_CONNECTED" />
+                <action android:name="android.intent.action.ACTION_POWER_DISCONNECTED" />
+            </intent-filter>
+        </receiver>
     </application>
 
 </manifest>

app/src/main/java/net/opencurlybraces/android/projects/androidpractices/MainActivity.java

@@ -1,5 +1,6 @@
 package net.opencurlybraces.android.projects.androidpractices;
 
+import android.content.Context;
 import android.content.Intent;
 import android.content.IntentFilter;
 import android.os.BatteryManager;
@@ -9,6 +10,7 @@
 import android.view.MenuItem;
 import android.widget.TextView;
 
+import net.opencurlybraces.android.projects.androidpractices.util.PowerUtils;
 import net.opencurlybraces.android.projects.androidpractices.util.PrefUtils;
 
 import java.util.concurrent.atomic.AtomicBoolean;
@@ -22,7 +24,7 @@ public class MainActivity extends ActionBarActivity {
 
     @InjectView (R.id.hello_text)
     TextView mHelloText;
-    AtomicBoolean mIsCharging = new AtomicBoolean();
+
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
@@ -40,17 +42,8 @@ protected void onCreate(Bundle savedInstanceState) {
     protected void onResume() {
         super.onResume();
 
-        IntentFilter ifilter = new IntentFilter(Intent.ACTION_BATTERY_CHANGED);
-        Intent batteryStatus = MainActivity.this.registerReceiver(null, ifilter);
-
-        int status = batteryStatus.getIntExtra(BatteryManager.EXTRA_STATUS, -1);
-        boolean isCharging = (status == BatteryManager.BATTERY_STATUS_CHARGING || status ==
-                BatteryManager.BATTERY_STATUS_FULL);
+        PrefUtils.setBatteryCharging(this, PowerUtils.isBatteryCharging(this));
 
-        if ((status == BatteryManager.BATTERY_STATUS_CHARGING) ^ mIsCharging.get()) {
-            mIsCharging.set(isCharging);
-            PrefUtils.setBatteryCharging(this, isCharging);
-        }
     }
 
 
@@ -132,4 +125,10 @@ public void onTrimMemory(int level) {
         }
     }
 
+    /**
+     * Return the battery charging status
+     *
+     * @return boolean
+     */
+
 }

app/src/main/java/net/opencurlybraces/android/projects/androidpractices/receiver/PowerConnectionReceiver.java

@@ -3,16 +3,23 @@
 import android.content.BroadcastReceiver;
 import android.content.Context;
 import android.content.Intent;
+import android.os.BatteryManager;
+
+import net.opencurlybraces.android.projects.androidpractices.util.PrefUtils;
 
 /**
  * Receiver thats listen to changes in power status changes
  * <p/>
- * TODO implement and define in manifest
- * Created by chris on 16/01/15.
+ * TODO implement and define in manifest Created by chris on 16/01/15.
  */
 public class PowerConnectionReceiver extends BroadcastReceiver {
     @Override
     public void onReceive(Context context, Intent intent) {
 
+        int status = intent.getIntExtra(BatteryManager.EXTRA_STATUS, -1);
+        boolean isCharging = (status == BatteryManager.BATTERY_STATUS_CHARGING || status ==
+                BatteryManager.BATTERY_STATUS_FULL);
+
+        PrefUtils.setBatteryCharging(context, isCharging);
     }
 }

app/src/main/java/net/opencurlybraces/android/projects/androidpractices/util/PowerUtils.java

@@ -0,0 +1,35 @@
+package net.opencurlybraces.android.projects.androidpractices.util;
+
+import android.content.Context;
+import android.content.Intent;
+import android.content.IntentFilter;
+import android.os.BatteryManager;
+
+/**
+ * Created by chris on 16/01/15.
+ */
+public class PowerUtils {
+
+
+    /**
+     * Try to get the battery charging status using the sticky intents {@code android.intent.action
+     * .ACTION_POWER_CONNECTED} and {@code android.intent.action .ACTION_POWER_DISCONNECTED} .
+     * If there's no sticky intent, get the value from {@link android.content .SharedPreferences}
+     *
+     * @param context
+     * @return boolean
+     */
+    public static boolean isBatteryCharging(final Context context) {
+        IntentFilter ifilter = new IntentFilter(Intent.ACTION_BATTERY_CHANGED);
+        Intent batteryStatus = context.registerReceiver(null,
+                ifilter); //Get a sticky intent or null
+
+        if (batteryStatus == null) return PrefUtils.isBatteryCharging(context);
+
+        int status = batteryStatus.getIntExtra(BatteryManager.EXTRA_STATUS, -1);
+
+        return (status == BatteryManager.BATTERY_STATUS_CHARGING || status ==
+                BatteryManager.BATTERY_STATUS_FULL);
+
+    }
+}

app/src/main/java/net/opencurlybraces/android/projects/androidpractices/util/PrefUtils.java

@@ -32,7 +32,7 @@ public static boolean isBatteryCharging(final Context context) {
     }
 
     /**
-     * Stores asynchronously the battery charging status in {@link SharedPreferences}.
+     * Store asynchronously the battery charging status in {@link SharedPreferences}.
      *
      * @param context
      * @param isCharging