update Dialog: Show app update to ZulipMobile dialog on start up.

Dialog button have play store link.

Author: jainkuniya

app/src/main/java/com/zulip/android/activities/LoginActivity.java

@@ -42,6 +42,7 @@
 import com.zulip.android.util.AnimationHelper;
 import com.zulip.android.util.CommonProgressDialog;
 import com.zulip.android.util.Constants;
+import com.zulip.android.util.ShowAppUpdateDialog;
 
 import org.json.JSONException;
 import org.json.JSONObject;
@@ -82,6 +83,9 @@ public class LoginActivity extends BaseActivity implements View.OnClickListener,
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
 
+        //show app update dialog
+        ShowAppUpdateDialog.showDialog(LoginActivity.this);
+
         setContentView(R.layout.login);
 
         Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);

app/src/main/java/com/zulip/android/activities/ZulipActivity.java

@@ -118,6 +118,7 @@
 import com.zulip.android.util.ListDialog;
 import com.zulip.android.util.MutedTopics;
 import com.zulip.android.util.RemoveViewsOnScroll;
+import com.zulip.android.util.ShowAppUpdateDialog;
 import com.zulip.android.util.SwipeRemoveLinearLayout;
 import com.zulip.android.util.UrlHelper;
 import com.zulip.android.util.ZLog;
@@ -350,6 +351,9 @@ protected void onCreate(Bundle savedInstanceState) {
             return;
         }
 
+        // show app update dialog
+        ShowAppUpdateDialog.showDialog(ZulipActivity.this);
+
         if (mMutedTopics == null) {
             mMutedTopics = MutedTopics.get();
         }

app/src/main/java/com/zulip/android/util/ShowAppUpdateDialog.java

@@ -0,0 +1,37 @@
+package com.zulip.android.util;
+
+import android.content.Context;
+import android.content.DialogInterface;
+import android.content.Intent;
+import android.net.Uri;
+import android.support.v7.app.AlertDialog;
+
+import com.zulip.android.R;
+
+
+public class ShowAppUpdateDialog {
+
+    public static void showDialog(final Context context) {
+        AlertDialog.Builder builder = new AlertDialog.Builder(context);
+
+        builder.setPositiveButton(R.string.update, new DialogInterface.OnClickListener() {
+            public void onClick(DialogInterface dialog, int id) {
+                // open new app page on play store
+                Intent intent = new Intent(Intent.ACTION_VIEW,
+                        Uri.parse("https://play.google.com/store/apps/details?id=com.zulipmobile&hl=en_IN"));
+                context.startActivity(intent);
+            }
+        });
+        builder.setNegativeButton(R.string.cancel, new DialogInterface.OnClickListener() {
+            public void onClick(DialogInterface dialog, int id) {
+
+            }
+        });
+        AlertDialog dialog = builder.create();
+        dialog.setMessage("This project is deprecated in favor of React Native app, " +
+                "which supports both iOS and Android. Click update to switch to the new app.");
+
+        dialog.show();
+
+    }
+}

app/src/main/res/values/strings.xml

@@ -184,4 +184,5 @@
     <string name="placeholder_message_here">Message here</string>
     <string name="placeholder_sender_name">Sender name</string>
     <string name="placeholder_social">Social</string>
+    <string name="update">Update</string>
 </resources>