Added `getTotalMemory()` and `getMaxMemory()` functions

README.md

@@ -190,10 +190,13 @@ var DeviceInfo = require('react-native-device-info');
 | Phone Number               | `getPhoneNumber()`                 | `?string` e.g. "2348675309" or ""                                                             | Only supported in Android                                                                                           |
 | First Install Time         | `getFirstInstallTime()`            | `number` e.g. 1505607068808                                                                   | Only supported in Android                                                                                           |
 | Last Install Time          | `getLastUpdateTime()`              | `number` e.g. 1505607068808                                                                   | Only supported in Android                                                                                           |
-| Serial Number              | `getSerialNumber()`                | `string`                                                                                      | Only supported in Android
-| IP Address                 | `getIPAddress()`                   | `Promise<string>`                                                                             | Only supported in Android
-| MAC Address                | `getMACAddress()`                  | `Promise<string>`                                                                             | Only supported in Android
-| Carrier                    | `getCarrier()`                    | `string` e.g. "SOFTBANK"                                                           |                                                                                                                     | |
+| Serial Number              | `getSerialNumber()`                | `string`                                                                                      | Only supported in Android                                                                                           |
+| IP Address                 | `getIPAddress()`                   | `Promise<string>`                                                                             | Only supported in Android                                                                                           |
+| MAC Address                | `getMACAddress()`                  | `Promise<string>`                                                                             | Only supported in Android                                                                                           |
+| Carrier                    | `getCarrier()`                     | `string` e.g. "SOFTBANK"                                                                      |                                                                                                                     |
+| Total Memory               | `getTotalMemory()`                 | `number` e.g. 1995018240                                                                      | Total ammount of memory on the device                                                                               |
+| Max Memory                 | `getMaxMemory()`                   | `number` e.g. 268435456                                                                       | ANDROID ONLY - see https://developer.android.com/reference/java/lang/Runtime.html#maxMemory()                       |
+
 Since the device setting for PIN/Fingerprint can be modified while the app is still open, this is available via callback instead of as a constant.  To use, pass a callback function to the returned bridge function in your javascript:
 
 ```js

RNDeviceInfo/RNDeviceInfo.m

@@ -200,6 +200,10 @@ RCT_EXPORT_MODULE(RNDeviceInfo)
     return ([format rangeOfString:@"a"].location == NSNotFound);
 }
 
+- (unsigned long long) totalMemory {
+  return [NSProcessInfo processInfo].physicalMemory;
+}
+
 - (NSDictionary *)constantsToExport
 {
     UIDevice *currentDevice = [UIDevice currentDevice];
@@ -227,6 +231,7 @@ RCT_EXPORT_MODULE(RNDeviceInfo)
              @"isEmulator": @(self.isEmulator),
              @"isTablet": @(self.isTablet),
              @"is24Hour": @(self.is24Hour),
+             @"totalMemory": @(self.totalMemory)
              };
 }
 

android/src/main/java/com/learnium/RNDeviceInfo/RNDeviceModule.java

@@ -14,6 +14,7 @@ import android.provider.Settings.Secure;
 import android.webkit.WebSettings;
 import android.telephony.TelephonyManager;
 import android.text.format.Formatter;
+import android.app.ActivityManager;
 
 import com.facebook.react.bridge.ReactApplicationContext;
 import com.facebook.react.bridge.ReactContextBaseJavaModule;
@@ -25,6 +26,7 @@ import java.util.HashMap;
 import java.util.Locale;
 import java.util.Map;
 import java.util.TimeZone;
+import java.lang.Runtime;
 
 import javax.annotation.Nullable;
 
@@ -188,6 +190,14 @@ public class RNDeviceModule extends ReactContextBaseJavaModule {
         constants.put("phoneNumber", telMgr.getLine1Number());
     }
     constants.put("carrier", this.getCarrier());
+
+    Runtime rt = Runtime.getRuntime();
+    constants.put("maxMemory", rt.maxMemory());
+    ActivityManager actMgr = (ActivityManager) this.reactContext.getSystemService(Context.ACTIVITY_SERVICE);
+    ActivityManager.MemoryInfo memInfo = new ActivityManager.MemoryInfo();
+    actMgr.getMemoryInfo(memInfo);
+    constants.put("totalMemory", memInfo.totalMem);
+
     return constants;
   }
 }

deviceinfo.d.ts

@@ -30,3 +30,5 @@ export function getMACAddress(): Promise<string>;
 export function getPhoneNumber(): string;
 export function getAPILevel(): number;
 export function getCarrier(): string;
+export function getTotalMemory(): number;
+export function getMaxMemory(): number;

deviceinfo.js

@@ -92,4 +92,10 @@ module.exports = {
   getCarrier: function() {
     return RNDeviceInfo.carrier;
   },
+  getTotalMemory: function() {
+    return RNDeviceInfo.totalMemory;
+  },
+  getMaxMemory: function() {
+    return RNDeviceInfo.maxMemory;
+  },
 };

deviceinfo.js.flow

@@ -30,4 +30,6 @@ declare module.exports: {
   getIPAddress: () => Promise<string>,
   getMACAddress: () => Promise<string>,
   getCarrier: () => string,
+  getTotalMemory: () => number,
+  getMaxMemory: () => number,
 }