MpApp保活

检查App.db最后更新时间，如果超过30分钟没有变化，则重启MpApp

mpmaster/src/main/java/com/xypower/mpmaster/AppMaster.java

@@ -102,6 +102,13 @@ public class AppMaster {
             public void run() {
 
                 // mMasterUrl = "http://192.168.50.100/mntn/";
+                final Context context = mService.getApplicationContext();
+                String appPath = MicroPhotoContext.buildAppDir(context);
+                File mpappDb = new File(appPath + "data/App.db");
+                if (System.currentTimeMillis() - mpappDb.lastModified() > 1800000)  // greater than 30m{
+
+                    MicroPhotoContext.restartMpApp(context);
+                }
 
                 String masterUrl = mMasterUrl;