From f366f09c4c79348e3e79f5e9073594f477d4cf7c Mon Sep 17 00:00:00 2001
From: "Unknown W. Brackets" <checkins@unknownbrackets.org>
Date: Sun, 24 Jul 2016 17:29:04 -0700
Subject: [PATCH] Android: Detect pre-L power saving.

Sometimes users don't realize these are on, and they can slow down
gameplay.  Of course, they can also save battery.
---
 .../src/org/ppsspp/ppsspp/NativeActivity.java | 14 +---
 .../ppsspp/ppsspp/PowerSaveModeReceiver.java  | 68 +++++++++++++++----
 2 files changed, 55 insertions(+), 27 deletions(-)

diff --git a/android/src/org/ppsspp/ppsspp/NativeActivity.java b/android/src/org/ppsspp/ppsspp/NativeActivity.java
index 245f45c5b6..52cca0b46d 100644
--- a/android/src/org/ppsspp/ppsspp/NativeActivity.java
+++ b/android/src/org/ppsspp/ppsspp/NativeActivity.java
@@ -125,16 +125,6 @@ public class NativeActivity extends Activity implements SurfaceHolder.Callback {
 		}
 	}
 
-	@TargetApi(21)
-	private void sendPowerSaving() {
-		final PowerManager pm = (PowerManager)getSystemService(Context.POWER_SERVICE);
-		if (pm.isPowerSaveMode()) {
-			NativeApp.sendMessage("core_powerSaving", "true");
-		} else {
-			NativeApp.sendMessage("core_powerSaving", "false");
-		}
-	}
-
 	String getApplicationLibraryDir(ApplicationInfo application) {
 	    String libdir = null;
 	    try {
@@ -283,9 +273,7 @@ public class NativeActivity extends Activity implements SurfaceHolder.Callback {
 		javaGL = "true".equalsIgnoreCase(NativeApp.queryConfig("androidJavaGL"));
 
 		sendInitialGrants();
-		if (Build.VERSION.SDK_INT >= 21) {
-			sendPowerSaving();
-		}
+		PowerSaveModeReceiver.initAndSend(this);
 
 		// OK, config should be initialized, we can query for screen rotation.
 		if (Build.VERSION.SDK_INT >= 9) {
diff --git a/android/src/org/ppsspp/ppsspp/PowerSaveModeReceiver.java b/android/src/org/ppsspp/ppsspp/PowerSaveModeReceiver.java
index 27a2b92f7d..1a016910d0 100644
--- a/android/src/org/ppsspp/ppsspp/PowerSaveModeReceiver.java
+++ b/android/src/org/ppsspp/ppsspp/PowerSaveModeReceiver.java
@@ -1,24 +1,22 @@
 package org.ppsspp.ppsspp;
 
 import android.annotation.TargetApi;
+import android.app.Activity;
 import android.content.BroadcastReceiver;
 import android.content.Context;
 import android.content.Intent;
+import android.database.ContentObserver;
+import android.net.Uri;
 import android.os.Build;
 import android.os.PowerManager;
+import android.provider.Settings;
 
 public class PowerSaveModeReceiver extends BroadcastReceiver {
-	private boolean isPowerSaving = false;
-	private boolean isBatteryLow = false;
+	private static boolean isPowerSaving = false;
+	private static boolean isBatteryLow = false;
 
 	@Override
 	public void onReceive(final Context context, final Intent intent) {
-		if (Build.VERSION.SDK_INT >= 21) {
-			isPowerSaving = getPowerSaving(context);
-		} else {
-			isPowerSaving = false;
-		}
-
 		final String action = intent.getAction();
 		if (action.equals(Intent.ACTION_BATTERY_LOW)) {
 			isBatteryLow = true;
@@ -26,16 +24,58 @@ public class PowerSaveModeReceiver extends BroadcastReceiver {
 			isBatteryLow = false;
 		}
 
+		sendPowerSaving(context);
+	}
+
+	public static void initAndSend(final Activity activity) {
+		sendPowerSaving(activity);
+
+		activity.getContentResolver().registerContentObserver(Settings.System.CONTENT_URI, true, new ContentObserver(null) {
+			@Override
+			public void onChange(boolean selfChange, Uri uri) {
+				super.onChange(selfChange, uri);
+
+				String key = uri.getPath();
+				key = key.substring(key.lastIndexOf("/") + 1, key.length());
+				if (key != null && (key.equals("user_powersaver_enable") || key.equals("psm_switch"))) {
+					PowerSaveModeReceiver.sendPowerSaving(activity);
+				}
+			}
+		});
+	}
+
+	@TargetApi(21)
+	private static boolean getNativePowerSaving(final Context context) {
+		final PowerManager pm = (PowerManager)context.getSystemService(Context.POWER_SERVICE);
+		return pm.isPowerSaveMode();
+	}
+
+	private static boolean getExtraPowerSaving(final Context context) {
+		// http://stackoverflow.com/questions/25065635/checking-for-power-saver-mode-programically
+		// HTC (Sense)
+		String htcValue = Settings.System.getString(context.getContentResolver(), "user_powersaver_enable");
+		if (htcValue != null && htcValue.equals("1")) {
+			return true;
+		}
+		// Samsung (Touchwiz)
+		String samsungValue = Settings.System.getString(context.getContentResolver(), "psm_switch");
+		if (samsungValue != null && samsungValue.equals("1")) {
+			return true;
+		}
+		return false;
+	}
+
+	private static void sendPowerSaving(final Context context) {
+		if (Build.VERSION.SDK_INT >= 21) {
+			isPowerSaving = getNativePowerSaving(context) || getExtraPowerSaving(context);
+		} else {
+			isPowerSaving = getExtraPowerSaving(context);
+		}
+
 		if (isBatteryLow || isPowerSaving) {
 			NativeApp.sendMessage("core_powerSaving", "true");
 		} else {
 			NativeApp.sendMessage("core_powerSaving", "false");
 		}
 	}
-
-	@TargetApi(21)
-	private boolean getPowerSaving(final Context context) {
-		final PowerManager pm = (PowerManager)context.getSystemService(Context.POWER_SERVICE);
-		return pm.isPowerSaveMode();
-	}
 }