support powerstate/battery level in Android

frontend/drivers/platform_unix.c

@@ -95,7 +95,7 @@ enum
    INTERNAL_STORAGE_NOT_WRITABLE
 };
 
-struct android_app *g_android;
+struct android_app *g_android = NULL;
 
 static pthread_key_t thread_key;
 
@@ -1139,7 +1139,24 @@ static enum frontend_powerstate frontend_unix_get_powerstate(
 {
    enum frontend_powerstate ret = FRONTEND_POWERSTATE_NONE;
 
-#ifndef ANDROID
+#ifdef ANDROID
+   jint powerstate = ret;
+   jint battery_level = 0;
+   JNIEnv *env = jni_thread_getenv();
+
+   if (!env || !g_android)
+      return ret;
+
+   CALL_INT_METHOD(env, powerstate,
+         g_android->activity->clazz, g_android->getPowerstate);
+
+   CALL_INT_METHOD(env, battery_level,
+         g_android->activity->clazz, g_android->getBatteryLevel);
+
+   *percent = battery_level;
+
+   ret = (enum frontend_powerstate)powerstate;
+#else
    if (frontend_unix_powerstate_check_acpi_sysfs(&ret, seconds, percent))
       return ret;
 
@@ -1992,6 +2009,10 @@ static void frontend_unix_init(void *data)
          "onRetroArchExit", "()V");
    GET_METHOD_ID(env, android_app->isAndroidTV, class,
          "isAndroidTV", "()Z");
+   GET_METHOD_ID(env, android_app->getPowerstate, class,
+         "getPowerstate", "()I");
+   GET_METHOD_ID(env, android_app->getBatteryLevel, class,
+         "getBatteryLevel", "()I");
    CALL_OBJ_METHOD(env, obj, android_app->activity->clazz,
          android_app->getIntent);
 

frontend/drivers/platform_unix.h

@@ -160,6 +160,8 @@ struct android_app
    jmethodID getPendingIntentDownloadsLocation;
    jmethodID getPendingIntentScreenshotsLocation;
    jmethodID isAndroidTV;
+   jmethodID getPowerstate;
+   jmethodID getBatteryLevel;
 };
 
 

pkg/android/phoenix/src/com/retroarch/browser/retroactivity/RetroActivityCommon.java

@@ -2,7 +2,10 @@ package com.retroarch.browser.retroactivity;
 
 import com.retroarch.browser.preferences.util.UserPreferences;
 import android.content.res.Configuration;
+import android.content.Intent;
+import android.content.IntentFilter;
 import android.app.UiModeManager;
+import android.os.BatteryManager;
 import android.util.Log;
 
 /**
@@ -10,6 +13,12 @@ import android.util.Log;
  */
 public class RetroActivityCommon extends RetroActivityLocation
 {
+  public static int FRONTEND_POWERSTATE_NONE = 0;
+  public static int FRONTEND_POWERSTATE_NO_SOURCE = 1;
+  public static int FRONTEND_POWERSTATE_CHARGING = 2;
+  public static int FRONTEND_POWERSTATE_CHARGED = 3;
+  public static int FRONTEND_POWERSTATE_ON_POWER_SOURCE = 4;
+
 	// Exiting cleanly from NDK seems to be nearly impossible.
 	// Have to use exit(0) to avoid weird things happening, even with runOnUiThread() approaches.
 	// Use a separate JNI function to explicitly trigger the readback.
@@ -18,6 +27,46 @@ public class RetroActivityCommon extends RetroActivityLocation
       finish();
 	}
 
+  public int getBatteryLevel()
+  {
+    IntentFilter ifilter = new IntentFilter(Intent.ACTION_BATTERY_CHANGED);
+    // This doesn't actually register anything (or need to) because we know this particular intent is sticky and we do not specify a BroadcastReceiver anyway
+    Intent batteryStatus = registerReceiver(null, ifilter);
+    int level = batteryStatus.getIntExtra(BatteryManager.EXTRA_LEVEL, 0);
+    int scale = batteryStatus.getIntExtra(BatteryManager.EXTRA_SCALE, 100);
+
+    float percent = ((float)level / (float)scale) * 100.0f;
+
+    Log.i("RetroActivity", "battery: level = " + level + ", scale = " + scale + ", percent = " + percent);
+
+    return (int)percent;
+  }
+
+  public int getPowerstate()
+  {
+    IntentFilter ifilter = new IntentFilter(Intent.ACTION_BATTERY_CHANGED);
+    // This doesn't actually register anything (or need to) because we know this particular intent is sticky and we do not specify a BroadcastReceiver anyway
+    Intent batteryStatus = registerReceiver(null, ifilter);
+    int status = batteryStatus.getIntExtra(BatteryManager.EXTRA_STATUS, -1);
+    boolean hasBattery = batteryStatus.getBooleanExtra(BatteryManager.EXTRA_PRESENT, false);
+    boolean isCharging = (status == BatteryManager.BATTERY_STATUS_CHARGING);
+    boolean isCharged = (status == BatteryManager.BATTERY_STATUS_FULL);
+    int powerstate = FRONTEND_POWERSTATE_NONE;
+
+    if (isCharged)
+      powerstate = FRONTEND_POWERSTATE_CHARGED;
+    else if (isCharging)
+      powerstate = FRONTEND_POWERSTATE_CHARGING;
+    else if (!hasBattery)
+      powerstate = FRONTEND_POWERSTATE_NO_SOURCE;
+    else
+      powerstate = FRONTEND_POWERSTATE_ON_POWER_SOURCE;
+
+    Log.i("RetroActivity", "power state = " + powerstate);
+
+    return powerstate;
+  }
+
   public boolean isAndroidTV()
   {
     Configuration config = getResources().getConfiguration();