activityx: use contracts more and refine

This is the beginning; there are still many of the old API's callsites
to convert.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

ui/src/main/java/com/wireguard/android/activity/LogViewerActivity.kt

@@ -24,6 +24,7 @@ import android.view.Menu
 import android.view.MenuItem
 import android.view.View
 import android.view.ViewGroup
+import androidx.activity.result.contract.ActivityResultContracts
 import androidx.appcompat.app.AppCompatActivity
 import androidx.core.app.ShareCompat
 import androidx.core.content.res.ResourcesCompat
@@ -109,6 +110,10 @@ class LogViewerActivity : AppCompatActivity() {
 
         lifecycleScope.launch(Dispatchers.IO) { streamingLog() }
 
+        val revokeLastActivityResultLauncher = registerForActivityResult(ActivityResultContracts.StartActivityForResult()) {
+            revokeLastUri()
+        }
+
         binding.shareFab.setOnClickListener {
             revokeLastUri()
             val key = KeyPair().privateKey.toHex()
@@ -122,17 +127,10 @@ class LogViewerActivity : AppCompatActivity() {
                     .createChooserIntent()
                     .addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION)
             grantUriPermission("android", lastUri, Intent.FLAG_GRANT_READ_URI_PERMISSION)
-            startActivityForResult(shareIntent, SHARE_ACTIVITY_REQUEST)
+            revokeLastActivityResultLauncher.launch(shareIntent)
         }
     }
 
-    override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
-        if (requestCode == SHARE_ACTIVITY_REQUEST) {
-            revokeLastUri()
-        }
-        super.onActivityResult(requestCode, resultCode, data)
-    }
-
     override fun onCreateOptionsMenu(menu: Menu?): Boolean {
         menuInflater.inflate(R.menu.log_viewer, menu)
         saveButton = menu?.findItem(R.id.save_log)
@@ -207,7 +205,7 @@ class LogViewerActivity : AppCompatActivity() {
                                 it.scrollToPosition(logLines.size - 1)
                         }
                     } else {
-                        /* I'd prefer for the next line to be:
+                        /* TODO: I'd prefer for the next line to be:
                          * logLines.lastOrNull()?.msg += "\n$line"
                          * However, as of writing, that causes the kotlin compiler to freak out and crash, spewing bytecode.
                          */
@@ -259,7 +257,6 @@ class LogViewerActivity : AppCompatActivity() {
          */
         private val THREADTIME_LINE: Pattern = Pattern.compile("^(\\d{2}-\\d{2} \\d{2}:\\d{2}:\\d{2}.\\d{3})(?:\\s+[0-9A-Za-z]+)?\\s+(\\d+)\\s+(\\d+)\\s+([A-Z])\\s+(.+?)\\s*: (.*)$")
         private val LOGS: MutableMap<String, ByteArray> = ConcurrentHashMap()
-        private const val SHARE_ACTIVITY_REQUEST = 49133
     }
 
     private inner class LogEntryAdapter : RecyclerView.Adapter<LogEntryAdapter.ViewHolder>() {

ui/src/main/java/com/wireguard/android/fragment/BaseFragment.kt

@@ -5,10 +5,10 @@
 package com.wireguard.android.fragment
 
 import android.content.Context
-import android.content.Intent
 import android.util.Log
 import android.view.View
 import android.widget.Toast
+import androidx.activity.result.contract.ActivityResultContracts
 import androidx.databinding.DataBindingUtil
 import androidx.databinding.ViewDataBinding
 import androidx.fragment.app.Fragment
@@ -34,21 +34,21 @@ abstract class BaseFragment : Fragment(), OnSelectedTunnelChangedListener {
     private var baseActivity: BaseActivity? = null
     private var pendingTunnel: ObservableTunnel? = null
     private var pendingTunnelUp: Boolean? = null
+    private val permissionActivityResultLauncher = registerForActivityResult(ActivityResultContracts.StartActivityForResult()) {
+        val tunnel = pendingTunnel
+        val checked = pendingTunnelUp
+        if (tunnel != null && checked != null)
+            setTunnelStateWithPermissionsResult(tunnel, checked)
+        pendingTunnel = null
+        pendingTunnelUp = null
+    }
+
     protected var selectedTunnel: ObservableTunnel?
         get() = baseActivity?.selectedTunnel
         protected set(tunnel) {
             baseActivity?.selectedTunnel = tunnel
         }
 
-    override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
-        super.onActivityResult(requestCode, resultCode, data)
-        if (requestCode == REQUEST_CODE_VPN_PERMISSION) {
-            if (pendingTunnel != null && pendingTunnelUp != null) setTunnelStateWithPermissionsResult(pendingTunnel!!, pendingTunnelUp!!)
-            pendingTunnel = null
-            pendingTunnelUp = null
-        }
-    }
-
     override fun onAttach(context: Context) {
         super.onAttach(context)
         if (context is BaseActivity) {
@@ -77,7 +77,7 @@ abstract class BaseFragment : Fragment(), OnSelectedTunnelChangedListener {
                 if (intent != null) {
                     pendingTunnel = tunnel
                     pendingTunnelUp = checked
-                    startActivityForResult(intent, REQUEST_CODE_VPN_PERMISSION)
+                    permissionActivityResultLauncher.launch(intent)
                     return@launch
                 }
             }
@@ -96,7 +96,7 @@ abstract class BaseFragment : Fragment(), OnSelectedTunnelChangedListener {
                 val view = view
                 if (view != null)
                     Snackbar.make(view, message, Snackbar.LENGTH_LONG)
-                            .setAnchorView(view.findViewById<View>(R.id.create_fab))
+                            .setAnchorView(view.findViewById(R.id.create_fab))
                             .show()
                 else
                     Toast.makeText(requireContext(), message, Toast.LENGTH_LONG).show()
@@ -106,7 +106,6 @@ abstract class BaseFragment : Fragment(), OnSelectedTunnelChangedListener {
     }
 
     companion object {
-        private const val REQUEST_CODE_VPN_PERMISSION = 23491
         private const val TAG = "WireGuard/BaseFragment"
     }
 }