implemented github update checking

app/build.gradle

@@ -11,8 +11,8 @@ android {
         applicationId "com.nareshkumarrao.eiweblog"
         minSdkVersion 16
         targetSdkVersion 30
-        versionCode 3
-        versionName "0.9.2"
+        versionCode 4
+        versionName "0.9.3"
 
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
     }

app/release/output-metadata.json

@@ -10,8 +10,8 @@
     {
       "type": "SINGLE",
       "filters": [],
-      "versionCode": 3,
-      "versionName": "0.9.2",
+      "versionCode": 4,
+      "versionName": "0.9.3",
       "outputFile": "app-release.apk"
     }
   ]

app/src/main/java/com/nareshkumarrao/eiweblog/MainActivity.kt

@@ -1,10 +1,13 @@
 package com.nareshkumarrao.eiweblog
 
 import android.content.Intent
+import android.content.pm.PackageInfo
+import android.net.Uri
 import android.os.Bundle
 import android.view.Menu
 import android.view.MenuItem
 import android.view.View
+import androidx.appcompat.app.AlertDialog
 import androidx.appcompat.app.AppCompatActivity
 import androidx.appcompat.widget.Toolbar
 import androidx.viewpager.widget.ViewPager
@@ -38,10 +41,48 @@ class MainActivity : AppCompatActivity() {
                 .build()
         WorkManager.getInstance(this).enqueue(uploadWorkRequest)
 
+        Utilities.fetchRepoReleaseInformation(this, ::repoReleaseCallback)
 
 
     }
 
+    private fun repoReleaseCallback(version: String, log: String, url: String?){
+        var version = version
+        val url = url ?: getString(R.string.github_repository)
+        val log = "Changelog $version: \n\n$log"
+
+        if(version.substring(0,1) == "v"){
+            version = version.substring(1)
+        }
+
+        val pInfo: PackageInfo = packageManager.getPackageInfo(packageName, 0)
+        val pVersion = pInfo.versionName
+
+        if( version != pVersion){
+            val builder = AlertDialog.Builder(this)
+
+            builder.apply {
+                setPositiveButton(getString(R.string.download)) { _, _ ->
+                    startActivity(
+                        Intent(
+                            Intent.ACTION_VIEW,
+                            Uri.parse(url)
+                        )
+                    )
+                }
+                setNegativeButton(getString(R.string.cancel)){ dialog, _ ->
+                    dialog.dismiss()
+                }
+            }
+            builder.setMessage(log)
+                .setTitle(getString(R.string.update_dialog))
+
+
+            builder.create().show()
+
+        }
+    }
+
     override fun onCreateOptionsMenu(menu: Menu?): Boolean {
         menuInflater.inflate(R.menu.toolbar_menu, menu)
         return true

app/src/main/java/com/nareshkumarrao/eiweblog/Utilities.kt

@@ -3,8 +3,8 @@ package com.nareshkumarrao.eiweblog
 import android.app.NotificationChannel
 import android.app.NotificationManager
 import android.app.PendingIntent
-import android.content.Intent
 import android.content.Context
+import android.content.Intent
 import android.os.Build
 import android.util.Log
 import android.util.Xml
@@ -12,6 +12,7 @@ import androidx.core.app.NotificationCompat
 import androidx.core.app.NotificationManagerCompat
 import androidx.core.text.HtmlCompat
 import com.android.volley.Request
+import com.android.volley.toolbox.JsonArrayRequest
 import com.android.volley.toolbox.StringRequest
 import com.android.volley.toolbox.Volley
 import com.nareshkumarrao.eiweblog.ui.main.Article
@@ -177,4 +178,31 @@ internal object Utilities {
         }
         return null
     }
+
+    fun fetchRepoReleaseInformation(context: Context?, callback: (v: String, log:String, url:String?) -> Unit){
+        val queue = Volley.newRequestQueue(context)
+        val url = context?.getString(R.string.github_api_releases)
+        val jsonObjectRequest = JsonArrayRequest(Request.Method.GET, url, null,
+                { response ->
+                    val latestRelease = response.getJSONObject(0)
+                    val releaseVersion = latestRelease.getString("tag_name")
+                    val releaseLog = latestRelease.getString("body")
+                    val releaseAssets = latestRelease.getJSONArray("assets")
+                    var releaseAPK: String? = null
+                    for(i in 0 until releaseAssets.length()){
+                        val asset = releaseAssets.getJSONObject(0)
+                        val contentType = asset.getString("content_type")
+                        if( contentType == "application/vnd.android.package-archive" ){
+                            releaseAPK = asset.getString("browser_download_url")
+                            break
+                        }
+                    }
+                    Log.d("RESTAPI", "v: $releaseVersion, log: $releaseLog, apk: $releaseAPK")
+                    callback(releaseVersion, releaseLog, releaseAPK)
+                },
+                {  error -> Log.e("RESTAPI", error.toString())
+                }
+        )
+        queue.add(jsonObjectRequest)
+    }
 }

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

@@ -17,4 +17,7 @@
         Diese sind in der GPLv3-Lizenz dieses Projekts geregelt. Du kannst mehr über den Lizenz und auch
         die Quellecode auf dem GitHub-Repository finden.
     </string>
+    <string name="download">Herunterladen</string>
+    <string name="cancel">Abbrechen</string>
+    <string name="update_dialog">Neues App-Version verfügbar</string>
 </resources>

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

@@ -18,4 +18,7 @@
         \nI put too many hours of work into this app, and if you like it and found it useful, I would really
         appreciate it if you bought me a beer, or maybe a tasty döner.
     </string>
+    <string name="download">Download</string>
+    <string name="cancel">Cancel</string>
+    <string name="update_dialog">New version of app available</string>
 </resources>

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

@@ -31,4 +31,8 @@
     <string name="enable_notifications">Notify me when new updates are posted to the weblog</string>
     <string name="enable_notifications_key" translatable="false">com.nareshkumarrao.notifications.key</string>
     <string name="github_repository" translatable="false">GitHub Repository</string>
+    <string name="github_api_releases" translatable="false">https://api.github.com/repos/naresh97/ei-weblog-android/releases</string>
+    <string name="update_dialog">New version of app available</string>
+    <string name="download">Download</string>
+    <string name="cancel">Cancel</string>
 </resources>