Android: Integrates native and java SystemMonitor.

BUG=154293

Review URL: https://chromiumcodereview.appspot.com/11027024

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@162124 0039d316-1c4b-4281-b951-d872f2087c98

3 files changed, 90 insertions, 1 deletions

diff --git a/base/android/base_jni_registrar.cc b/base/android/base_jni_registrar.cc
index df490db..fb93217 100644
--- a/base/android/base_jni_registrar.cc
+++ b/base/android/base_jni_registrar.cc
@@ -5,13 +5,14 @@
 #include "base/android/base_jni_registrar.h"
 
 #include "base/basictypes.h"
-#include "base/message_pump_android.h"
 #include "base/android/build_info.h"
 #include "base/android/jni_android.h"
 #include "base/android/jni_registrar.h"
 #include "base/android/locale_utils.h"
 #include "base/android/path_service_android.h"
 #include "base/android/path_utils.h"
+#include "base/message_pump_android.h"
+#include "base/system_monitor/system_monitor_android.h"
 
 namespace base {
 namespace android {
@@ -22,6 +23,7 @@ static RegistrationMethod kBaseRegisteredMethods[] = {
   { "PathService", base::android::RegisterPathService },
   { "PathUtils", base::android::RegisterPathUtils },
   { "SystemMessageHandler", base::MessagePumpForUI::RegisterBindings },
+  { "SystemMonitor", base::RegisterSystemMonitor },
 };
 
 bool RegisterJni(JNIEnv* env) {
diff --git a/base/android/java/src/org/chromium/base/PowerStatusReceiver.java b/base/android/java/src/org/chromium/base/PowerStatusReceiver.java
new file mode 100644
index 0000000..89594b8
--- /dev/null
+++ b/base/android/java/src/org/chromium/base/PowerStatusReceiver.java
@@ -0,0 +1,23 @@
+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package org.chromium.base;
+
+import android.content.BroadcastReceiver;
+import android.content.Context;
+import android.content.Intent;
+
+
+/**
+ * A BroadcastReceiver that listens to changes in power status and notifies
+ * SystemMonitor.
+ * It's instantiated by the framework via the application intent-filter
+ * declared in its manifest.
+ */
+public class PowerStatusReceiver extends BroadcastReceiver {
+    @Override
+    public void onReceive(Context context, Intent intent) {
+        SystemMonitor.onBatteryChargingChanged(intent);
+    }
+}
diff --git a/base/android/java/src/org/chromium/base/SystemMonitor.java b/base/android/java/src/org/chromium/base/SystemMonitor.java
new file mode 100644
index 0000000..f43f115
--- /dev/null
+++ b/base/android/java/src/org/chromium/base/SystemMonitor.java
@@ -0,0 +1,64 @@
+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package org.chromium.base;
+
+import android.content.Context;
+import android.content.Intent;
+import android.content.IntentFilter;
+import android.os.BatteryManager;
+import android.os.Looper;
+
+
+/**
+ * Integrates native SystemMonitor with the java side.
+ */
+@JNINamespace("base::android")
+public class SystemMonitor {
+    private static SystemMonitor sInstance;
+
+    private boolean mIsBatteryPower;
+
+    public static void createForTests(Context context) {
+        // Applications will create this once the
+        // JNI side has been fully wired up both sides.
+        // For tests, we just need native -> java, that is,
+        // we don't need to notify java -> native on creation.
+        sInstance = new SystemMonitor();
+    }
+
+    public static void create(Context context) {
+        if (sInstance == null) {
+            sInstance = new SystemMonitor();
+            IntentFilter ifilter = new IntentFilter(Intent.ACTION_BATTERY_CHANGED);
+            Intent batteryStatusIntent = context.registerReceiver(null, ifilter);
+            onBatteryChargingChanged(batteryStatusIntent);
+        }
+    }
+
+    private SystemMonitor() {
+    }
+
+    public static void onBatteryChargingChanged(Intent intent) {
+        if (sInstance == null) {
+            // We may be called by the framework intent-filter before being
+            // fully initialized. This is not a problem, since our constructor
+            // will check for the state later on.
+            return;
+        }
+        int chargePlug = intent.getIntExtra(BatteryManager.EXTRA_PLUGGED, -1);
+        // If we're not plugged, assume we're running on battery power.
+        sInstance.mIsBatteryPower = chargePlug != BatteryManager.BATTERY_PLUGGED_USB &&
+                                    chargePlug != BatteryManager.BATTERY_PLUGGED_AC;
+        nativeOnBatteryChargingChanged();
+    }
+
+    @CalledByNative
+    private static boolean isBatteryPower() {
+        return sInstance.mIsBatteryPower;
+    }
+
+    private static native void nativeOnBatteryChargingChanged();
+
+}