Replace apps list with a RecyclerView

this is way faster, more efficient - and it even enables the app to show 
app icone, which Closes #31

app/src/main/java/com/finnmglas/launcher/ChooseActivity.kt

@@ -2,21 +2,22 @@ package com.finnmglas.launcher
 
 import android.app.Activity
 import android.content.Intent
-import android.graphics.Color
-import android.net.Uri
 import android.os.Bundle
 import android.view.View
 import android.view.WindowManager
-import android.widget.TextView
 import android.widget.Toast
 import androidx.appcompat.app.AppCompatActivity
+import androidx.recyclerview.widget.LinearLayoutManager
+import androidx.recyclerview.widget.RecyclerView
+import com.finnmglas.launcher.choose.AppsRecyclerAdapter
 import com.finnmglas.launcher.extern.*
 import kotlinx.android.synthetic.main.activity_choose.*
 
 
 class ChooseActivity : AppCompatActivity() {
 
-    /** Activity Lifecycle functions */
+    private lateinit var viewAdapter: RecyclerView.Adapter<*>
+    private lateinit var viewManager: RecyclerView.LayoutManager
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
@@ -42,57 +43,32 @@ class ChooseActivity : AppCompatActivity() {
         // As older APIs somehow do not recognize the xml defined onClick
         activity_choose_close.setOnClickListener() { finish() }
 
+        // get info about which action this activity is open for
         val bundle = intent.extras
         val action = bundle!!.getString("action") // why choose an app
         val forApp = bundle.getString("forApp") // which app we choose
 
-        if (action == "launch")
+        when (action) {
-            activity_choose_heading.text = getString(R.string.choose_title_launch)
+            "launch" -> activity_choose_heading.text = getString(R.string.choose_title_launch)
-        else if (action == "pick")
+            "pick" -> activity_choose_heading.text = getString(R.string.choose_title)
-            activity_choose_heading.text = getString(R.string.choose_title)
+            "uninstall" -> activity_choose_heading.text = getString(R.string.choose_title_remove)
-        else if (action == "uninstall")
+        }
-            activity_choose_heading.text = getString(R.string.choose_title_remove)
 
-        /* Build Layout */
+        // set up the list / recycler
+        viewManager = LinearLayoutManager(this)
+        viewAdapter = AppsRecyclerAdapter( this, action, forApp)
 
-        for (resolveInfo in appsList) {
+        activity_choose_apps_recycler_view.apply {
-            val app = resolveInfo.activityInfo
+            // improve performance (since content changes don't change the layout size)
-
+            setHasFixedSize(true)
-            // creating TextView programmatically
+            layoutManager = viewManager
-            val tvdynamic = TextView(this)
+            adapter = viewAdapter
-            tvdynamic.textSize = 24f
-            tvdynamic.text = app.loadLabel(packageManager).toString()
-            tvdynamic.setTextColor(Color.parseColor("#cccccc"))
-
-            if (action == "launch"){
-                tvdynamic.setOnClickListener { startActivity(packageManager.getLaunchIntentForPackage(app.packageName)) }
-            }
-            else if (action == "pick"){
-                tvdynamic.setOnClickListener {
-                    val returnIntent = Intent()
-                    returnIntent.putExtra("value", app.packageName)
-                    returnIntent.putExtra("forApp", forApp)
-                    setResult(
-                        REQUEST_CHOOSE_APP,
-                        returnIntent
-                    )
-                    finish()
-                }
-            }
-            else if (action == "uninstall"){
-                tvdynamic.setOnClickListener {
-                    val intent = Intent(Intent.ACTION_UNINSTALL_PACKAGE)
-                    intent.data = Uri.parse("package:" + app.packageName)
-                    intent.putExtra(Intent.EXTRA_RETURN_RESULT, true)
-                    startActivityForResult(intent,
-                        REQUEST_UNINSTALL
-                    )
-                }
-            }
-            activity_choose_apps_list.addView(tvdynamic)
         }
     }
 
+    /*
+    }*/
+
     override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
         super.onActivityResult(requestCode, resultCode, data)
         if (requestCode == REQUEST_UNINSTALL) {

app/src/main/java/com/finnmglas/launcher/choose/AppInfo.kt

@@ -0,0 +1,9 @@
+package com.finnmglas.launcher.choose
+
+import android.graphics.drawable.Drawable
+
+class AppInfo {
+    var label: CharSequence? = null
+    var packageName: CharSequence? = null
+    var icon: Drawable? = null
+}

app/src/main/java/com/finnmglas/launcher/choose/AppsRecyclerAdapter.kt

@@ -0,0 +1,93 @@
+package com.finnmglas.launcher.choose
+
+import android.app.Activity
+import android.content.Context
+import android.content.Intent
+import android.content.pm.PackageManager
+import android.net.Uri
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import android.widget.ImageView
+import android.widget.TextView
+import android.widget.Toast
+import androidx.recyclerview.widget.RecyclerView
+import com.finnmglas.launcher.R
+import com.finnmglas.launcher.extern.*
+
+
+class AppsRecyclerAdapter(val activity: Activity, val action: String?, val forApp: String?):
+    RecyclerView.Adapter<AppsRecyclerAdapter.ViewHolder>() {
+
+    private val appsList: MutableList<AppInfo>
+
+    inner class ViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView),
+        View.OnClickListener {
+        var textView: TextView = itemView.findViewById(R.id.choose_row_app_name)
+        var img: ImageView = itemView.findViewById(R.id.choose_row_app_icon) as ImageView
+
+        override fun onClick(v: View) {
+            val pos = adapterPosition
+            val context: Context = v.context
+            val appPackageName = appsList[pos].packageName.toString()
+
+            when (action){
+                "launch" -> {
+                    val launchIntent: Intent = context.packageManager
+                        .getLaunchIntentForPackage(appPackageName)!!
+                    context.startActivity(launchIntent)
+                    Toast.makeText(v.context, appsList[pos].label.toString(), Toast.LENGTH_LONG)
+                        .show()
+                }
+                "pick" -> {
+                    val returnIntent = Intent()
+                    returnIntent.putExtra("value", appPackageName)
+                    returnIntent.putExtra("forApp", forApp)
+                    activity.setResult(REQUEST_CHOOSE_APP, returnIntent)
+                    activity.finish()
+                }
+                "uninstall" -> {
+                    val intent = Intent(Intent.ACTION_UNINSTALL_PACKAGE)
+                    intent.data = Uri.parse("package:$appPackageName")
+                    intent.putExtra(Intent.EXTRA_RETURN_RESULT, true)
+                    activity.startActivityForResult(intent, REQUEST_UNINSTALL)
+                }
+            }
+        }
+
+        init { itemView.setOnClickListener(this) }
+    }
+
+    override fun onBindViewHolder(viewHolder: ViewHolder, i: Int) {
+        val appLabel = appsList[i].label.toString()
+        val appPackage = appsList[i].packageName.toString()
+        val appIcon = appsList[i].icon
+        val textView = viewHolder.textView
+        textView.text = appLabel
+        val imageView: ImageView = viewHolder.img
+        imageView.setImageDrawable(appIcon)
+    }
+
+    override fun getItemCount(): Int { return appsList.size }
+
+    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
+        val inflater = LayoutInflater.from(parent.context)
+        val view: View = inflater.inflate(R.layout.recycler_apps_row, parent, false)
+        return ViewHolder(view)
+    }
+
+    init {
+        val pm: PackageManager = activity.packageManager
+        appsList = ArrayList()
+        val i = Intent(Intent.ACTION_MAIN, null)
+        i.addCategory(Intent.CATEGORY_LAUNCHER)
+        val allApps = pm.queryIntentActivities(i, 0)
+        for (ri in allApps) {
+            val app = AppInfo()
+            app.label = ri.loadLabel(pm)
+            app.packageName = ri.activityInfo.packageName
+            app.icon = ri.activityInfo.loadIcon(pm)
+            appsList.add(app)
+        }
+    }
+}

app/src/main/res/layout/activity_choose.xml

@@ -58,25 +58,19 @@
 
     </com.google.android.material.appbar.AppBarLayout>
 
-    <ScrollView
+    <androidx.recyclerview.widget.RecyclerView
-        android:layout_width="0dp"
+        android:id="@+id/activity_choose_apps_recycler_view"
-        android:layout_height="0dp"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
         android:layout_marginStart="16dp"
         android:layout_marginLeft="16dp"
-        android:layout_marginTop="16dp"
+        android:layout_marginTop="86dp"
         android:layout_marginEnd="16dp"
         android:layout_marginRight="16dp"
-        android:layout_marginBottom="16dp"
+        android:scrollbars="vertical"
         app:layout_constraintBottom_toBottomOf="parent"
         app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintTop_toBottomOf="@id/activity_choose_app_bar">
+        app:layout_constraintTop_toBottomOf="@id/activity_choose_app_bar" />
-
-        <LinearLayout
-            android:id="@+id/activity_choose_apps_list"
-            android:layout_width="match_parent"
-            android:layout_height="wrap_content"
-            android:orientation="vertical" />
-    </ScrollView>
 
 </androidx.constraintlayout.widget.ConstraintLayout>

app/src/main/res/layout/recycler_apps_row.xml

@@ -0,0 +1,30 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:layout_margin="15sp">
+
+    <ImageView
+        android:id="@+id/choose_row_app_icon"
+        android:layout_width="40sp"
+        android:layout_height="40sp"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent"
+        tools:ignore="ContentDescription" />
+
+    <TextView
+        android:id="@+id/choose_row_app_name"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_marginStart="60sp"
+        android:layout_marginLeft="60sp"
+        android:text=""
+        android:textSize="20sp"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent"/>
+
+</androidx.constraintlayout.widget.ConstraintLayout>