android: fix paddings and headers of Taildrop destination picker (#465)

Updates tailscale/corp#22362

First round of polish for the Taildrop device picker, to use more consistent metrics and SectionDivider resembling the rest of the app. We'll follow up with device icons like the ones we have on iOS in a later PR.

Signed-off-by: Andrea Gottardo <andrea@gottardo.me>

android/src/main/AndroidManifest.xml

@@ -61,6 +61,7 @@
             android:exported="true"
             android:label="@string/app_name"
             android:launchMode="singleTask"
+            android:theme="@style/Theme.MaterialComponents.DayNight.NoActionBar"
             android:windowSoftInputMode="adjustResize">
             <intent-filter>
                 <action android:name="android.intent.action.SEND" />

android/src/main/java/com/tailscale/ipn/ui/view/TaildropView.kt

@@ -8,11 +8,12 @@ import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.Row
 import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.WindowInsets
 import androidx.compose.foundation.layout.fillMaxHeight
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.layout.size
+import androidx.compose.foundation.layout.statusBars
 import androidx.compose.foundation.lazy.LazyColumn
-import androidx.compose.material3.HorizontalDivider
 import androidx.compose.material3.Icon
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Scaffold
@@ -31,6 +32,7 @@ import coil.compose.AsyncImage
 import com.tailscale.ipn.R
 import com.tailscale.ipn.ui.model.Ipn
 import com.tailscale.ipn.ui.model.Tailcfg
+import com.tailscale.ipn.ui.util.Lists.SectionDivider
 import com.tailscale.ipn.ui.util.set
 import com.tailscale.ipn.ui.viewModel.TaildropViewModel
 import com.tailscale.ipn.ui.viewModel.TaildropViewModelFactory
@@ -44,33 +46,36 @@ fun TaildropView(
     viewModel: TaildropViewModel =
         viewModel(factory = TaildropViewModelFactory(requestedTransfers, applicationScope))
 ) {
-  Scaffold(topBar = { Header(R.string.share) }) { paddingInsets ->
-    val showDialog = viewModel.showDialog.collectAsState().value
+  Scaffold(
+      contentWindowInsets = WindowInsets.Companion.statusBars,
+      topBar = { Header(R.string.share) }) { paddingInsets ->
+        val showDialog = viewModel.showDialog.collectAsState().value
 
-    // Show the error overlay
-    showDialog?.let { ErrorDialog(type = it, action = { viewModel.showDialog.set(null) }) }
+        // Show the error overlay
+        showDialog?.let { ErrorDialog(type = it, action = { viewModel.showDialog.set(null) }) }
 
-    Column(modifier = Modifier.padding(paddingInsets)) {
-      FileShareHeader(
-          fileTransfers = requestedTransfers.collectAsState().value,
-          totalSize = viewModel.totalSize)
-      Spacer(modifier = Modifier.size(8.dp))
+        Column(modifier = Modifier.padding(paddingInsets)) {
+          FileShareHeader(
+              fileTransfers = requestedTransfers.collectAsState().value,
+              totalSize = viewModel.totalSize)
 
-      when (viewModel.state.collectAsState().value) {
-        Ipn.State.Running -> {
-          val peers by viewModel.myPeers.collectAsState()
-          val context = LocalContext.current
-          FileSharePeerList(
-              peers = peers,
-              stateViewGenerator = { peerId -> viewModel.TrailingContentForPeer(peerId = peerId) },
-              onShare = { viewModel.share(context, it) })
-        }
-        else -> {
-          FileShareConnectView { viewModel.startVPN() }
+          when (viewModel.state.collectAsState().value) {
+            Ipn.State.Running -> {
+              val peers by viewModel.myPeers.collectAsState()
+              val context = LocalContext.current
+              FileSharePeerList(
+                  peers = peers,
+                  stateViewGenerator = { peerId ->
+                    viewModel.TrailingContentForPeer(peerId = peerId)
+                  },
+                  onShare = { viewModel.share(context, it) })
+            }
+            else -> {
+              FileShareConnectView { viewModel.startVPN() }
+            }
+          }
         }
       }
-    }
-  }
 }
 
 @Composable
@@ -79,9 +84,7 @@ fun FileSharePeerList(
     stateViewGenerator: @Composable (String) -> Unit,
     onShare: (Tailcfg.Node) -> Unit
 ) {
-  Column(modifier = Modifier.padding(horizontal = 8.dp)) {
-    Text(stringResource(R.string.my_devices), style = MaterialTheme.typography.titleMedium)
-  }
+  SectionDivider(stringResource(R.string.my_devices))
 
   when (peers.isEmpty()) {
     true -> {
@@ -113,8 +116,8 @@ fun FileSharePeerList(
 @Composable
 fun FileShareConnectView(onToggle: () -> Unit) {
   Column(
-      modifier = Modifier.padding(horizontal = 8.dp).fillMaxHeight(),
-      verticalArrangement = Arrangement.Center,
+      modifier = Modifier.padding(horizontal = 16.dp).fillMaxHeight(),
+      verticalArrangement = Arrangement.spacedBy(6.dp, alignment = Alignment.CenterVertically),
       horizontalAlignment = Alignment.CenterHorizontally) {
         Text(
             stringResource(R.string.connect_to_your_tailnet_to_share_files),
@@ -130,7 +133,7 @@ fun FileShareConnectView(onToggle: () -> Unit) {
 
 @Composable
 fun FileShareHeader(fileTransfers: List<Ipn.OutgoingFile>, totalSize: Long) {
-  Column(modifier = Modifier.padding(horizontal = 8.dp)) {
+  Column(modifier = Modifier.padding(horizontal = 12.dp)) {
     Row(verticalAlignment = Alignment.CenterVertically) {
       IconForTransfer(fileTransfers)
       Column(modifier = Modifier.padding(horizontal = 8.dp)) {
@@ -151,10 +154,12 @@ fun FileShareHeader(fileTransfers: List<Ipn.OutgoingFile>, totalSize: Long) {
           }
         }
         val size = Formatter.formatFileSize(LocalContext.current, totalSize.toLong())
-        Text(size, style = MaterialTheme.typography.titleMedium)
+        Text(
+            size,
+            style = MaterialTheme.typography.titleSmall,
+            color = MaterialTheme.colorScheme.secondary)
       }
     }
-    HorizontalDivider()
   }
 }
 

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

@@ -218,11 +218,11 @@
 
 
     <!-- Strings for the share activity -->
-    <string name="share">Send via Tailscale</string>
+    <string name="share">Send with Taildrop</string>
     <string name="share_device_not_connected">Unable to share files with this device. This device is not currently connected to the tailnet.</string>
     <string name="no_files_to_share">No files to share</string>
     <string name="file_count">%1$s files</string>
-    <string name="connect_to_your_tailnet_to_share_files">Connect to your tailnet to share files</string>
+    <string name="connect_to_your_tailnet_to_share_files">Connect to your tailnet to share files.</string>
     <string name="my_devices">My devices</string>
     <string name="no_devices_to_share_with">There are no devices on your tailnet to share to</string>
     <string name="taildrop_share_failed">Taildrop failed. Some files were not shared. Please try again.</string>