General Settings Screen

• implement basic launcher icon and name selection
• implement settings to control popups
• sets a new background

* implement basic background image selection, use placeholder colors for now

closes #53 (closed) closes #91 (closed)

related to #144 (closed)

app/src/main/java/org/torproject/vpn/ui/appearancesettings/data/LauncherAdapter.kt

+package org.torproject.vpn.ui.appearancesettings.data
+
+import android.view.LayoutInflater
+import android.view.View.GONE
+import android.view.View.VISIBLE
+import android.view.ViewGroup
+import androidx.recyclerview.widget.RecyclerView
+import org.torproject.vpn.databinding.AppItemViewBinding
+import org.torproject.vpn.ui.appearancesettings.model.LauncherModel
+
+class LauncherAdapter(
+    private var list: List<LauncherModel>,
+    var onAppIconSelected: ((item: LauncherModel) -> Unit)? = null
+) : RecyclerView.Adapter<RecyclerView.ViewHolder>() {
+    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): RecyclerView.ViewHolder {
+        val binding = AppItemViewBinding.inflate(LayoutInflater.from(parent.context), parent, false)
+        return AppItemViewItemViewHolder(binding)
+    }
+
+    override fun getItemCount(): Int {
+        return list.size
+    }
+
+    override fun onBindViewHolder(holder: RecyclerView.ViewHolder, position: Int) {
+        (holder as LauncherAdapter.AppItemViewItemViewHolder).bind(list[position])
+    }
+
+    fun update(list: List<LauncherModel>) {
+        this.list = list
+        notifyDataSetChanged()
+    }
+
+    inner class AppItemViewItemViewHolder(val binding: AppItemViewBinding) :
+        RecyclerView.ViewHolder(binding.root) {
+        fun bind(launcherModel: LauncherModel) {
+            binding.ivAppImage.setImageResource(launcherModel.drawableResId)
+            binding.ivSelectedIcn.visibility = if (launcherModel.selected) VISIBLE else GONE
+            binding.root.setOnClickListener {
+                onAppIconSelected?.invoke(launcherModel)
+            }
+            binding.tvAppTitle.text = binding.root.context.getText(launcherModel.appNameResId)
+        }
+    }
+}
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