Add support for Direct Share targets

As described in https://developer.android.com/training/sharing/direct-share-targets.

This makes connected devices with `SharePlugin` enabled show
up in Android's Sharesheet and can be directly shared to.

AndroidManifest.xml

@@ -120,6 +120,9 @@ SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
             </intent-filter>
+
+            <meta-data android:name="android.app.shortcuts"
+                android:resource="@xml/shortcuts" />
         </activity>
         <activity
             android:name="org.kde.kdeconnect.UserInterface.PluginSettingsActivity"

res/drawable/ic_device_desktop_shortcut.xml

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="utf-8"?>
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="108dp"
+    android:height="108dp"
+    android:tint="?attr/colorControlNormal"
+    android:viewportWidth="24"
+    android:viewportHeight="24">
+    <group android:pivotX="12" android:pivotY="12" android:scaleX="0.66" android:scaleY="0.66">
+        <path
+            android:fillColor="@android:color/white"
+            android:pathData="M21,2L3,2c-1.1,0 -2,0.9 -2,2v12c0,1.1 0.9,2 2,2h7v2L8,20v2h8v-2h-2v-2h7c1.1,0 2,-0.9 2,-2L23,4c0,-1.1 -0.9,-2 -2,-2zM21,16L3,16L3,4h18v12z" />
+    </group>
+</vector>

res/drawable/ic_device_laptop_shortcut.xml

@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="utf-8"?>
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="108dp"
+    android:height="108dp"
+    android:tint="?attr/colorControlNormal"
+    android:viewportWidth="24"
+    android:viewportHeight="24">
+    <group
+        android:pivotX="12"
+        android:pivotY="12"
+        android:scaleX="0.66"
+        android:scaleY="0.66">
+        <path
+            android:fillColor="@android:color/white"
+            android:pathData="M20,18c1.1,0 2,-0.9 2,-2V6c0,-1.1 -0.9,-2 -2,-2H4C2.9,4 2,4.9 2,6v10c0,1.1 0.9,2 2,2H0v2h24v-2H20zM4,6h16v10H4V6z" />
+    </group>
+</vector>

res/drawable/ic_device_phone_shortcut.xml

@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="utf-8"?>
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="108dp"
+    android:height="108dp"
+    android:tint="?attr/colorControlNormal"
+    android:viewportWidth="24"
+    android:viewportHeight="24">
+    <group
+        android:pivotX="12"
+        android:pivotY="12"
+        android:scaleX="0.66"
+        android:scaleY="0.66">
+        <path
+            android:fillColor="@android:color/white"
+            android:pathData="M16,1L8,1C6.34,1 5,2.34 5,4v16c0,1.66 1.34,3 3,3h8c1.66,0 3,-1.34 3,-3L19,4c0,-1.66 -1.34,-3 -3,-3zM14,21h-4v-1h4v1zM17.25,18L6.75,18L6.75,4h10.5v14z" />
+
+    </group>
+</vector>

res/drawable/ic_device_tablet_shortcut.xml

@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="utf-8"?>
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="108dp"
+    android:height="108dp"
+    android:tint="?attr/colorControlNormal"
+    android:viewportWidth="24"
+    android:viewportHeight="24">
+    <group
+        android:pivotX="12"
+        android:pivotY="12"
+        android:scaleX="0.66"
+        android:scaleY="0.66">
+        <path
+            android:fillColor="@android:color/white"
+            android:pathData="M21,4L3,4c-1.1,0 -2,0.9 -2,2v12c0,1.1 0.9,2 2,2h18c1.1,0 1.99,-0.9 1.99,-2L23,6c0,-1.1 -0.9,-2 -2,-2zM19,18L5,18L5,6h14v12z" />
+
+    </group>
+</vector>

res/drawable/ic_device_tv_shortcut.xml

@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="utf-8"?>
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="108dp"
+    android:height="108dp"
+    android:tint="?attr/colorControlNormal"
+    android:viewportWidth="24"
+    android:viewportHeight="24">
+    <group
+        android:pivotX="12"
+        android:pivotY="12"
+        android:scaleX="0.66"
+        android:scaleY="0.66">
+        <path
+            android:fillColor="@android:color/white"
+            android:pathData="M21,3L3,3c-1.1,0 -2,0.9 -2,2v12c0,1.1 0.9,2 2,2h5v2h8v-2h5c1.1,0 1.99,-0.9 1.99,-2L23,5c0,-1.1 -0.9,-2 -2,-2zM21,17L3,17L3,5h18v12z" />
+    </group>
+</vector>

res/xml/shortcuts.xml

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="utf-8"?>
+<shortcuts xmlns:android="http://schemas.android.com/apk/res/android">
+    <share-target android:targetClass="org.kde.kdeconnect.Plugins.SharePlugin.ShareActivity">
+        <data android:mimeType="*/*" />
+        <category android:name="org.kde.kdeconnect.category.SHARE_TARGET" />
+    </share-target>
+</shortcuts>

src/org/kde/kdeconnect/DeviceInfo.kt

@@ -22,13 +22,13 @@ import java.security.cert.CertificateException
  * DeviceInfo contains all the properties needed to instantiate a Device.
  */
 class DeviceInfo(
-    @JvmField val id : String,
+    @JvmField val id: String,
-    @JvmField val certificate : Certificate,
+    @JvmField val certificate: Certificate,
-    @JvmField var name : String,
+    @JvmField var name: String,
-    @JvmField var type : DeviceType,
+    @JvmField var type: DeviceType,
-    @JvmField var protocolVersion : Int = 0,
+    @JvmField var protocolVersion: Int = 0,
-    @JvmField var incomingCapabilities : Set<String>? = null,
+    @JvmField var incomingCapabilities: Set<String>? = null,
-    @JvmField var outgoingCapabilities : Set<String>? = null,
+    @JvmField var outgoingCapabilities: Set<String>? = null,
 ) {
 
     /**
@@ -40,7 +40,7 @@ class DeviceInfo(
         try {
             val encodedCertificate = Base64.encodeToString(certificate.encoded, 0)
 
-            with (settings.edit()) {
+            with(settings.edit()) {
                 putString("certificate", encodedCertificate)
                 putString("deviceName", name)
                 putString("deviceType", type.toString())
@@ -73,7 +73,7 @@ class DeviceInfo(
          */
         @JvmStatic
         @Throws(CertificateException::class)
-        fun loadFromSettings(context : Context, deviceId: String, settings: SharedPreferences) =
+        fun loadFromSettings(context: Context, deviceId: String, settings: SharedPreferences) =
             with(settings) {
                 DeviceInfo(
                     id = deviceId,
@@ -104,8 +104,8 @@ class DeviceInfo(
         @JvmStatic
         fun isValidIdentityPacket(identityPacket: NetworkPacket): Boolean = with(identityPacket) {
             type == NetworkPacket.PACKET_TYPE_IDENTITY &&
-                DeviceHelper.filterName(getString("deviceName", "")).isNotBlank() &&
+                    DeviceHelper.filterName(getString("deviceName", "")).isNotBlank() &&
-                getString("deviceId", "").isNotBlank()
+                    getString("deviceId", "").isNotBlank()
         }
     }
 }
@@ -126,7 +126,7 @@ enum class DeviceType {
         ContextCompat.getDrawable(context, toDrawableId())!!
 
     @DrawableRes
-    private fun toDrawableId() =
+    fun toDrawableId() =
         when (this) {
             PHONE -> R.drawable.ic_device_phone_32dp
             TABLET -> R.drawable.ic_device_tablet_32dp
@@ -135,6 +135,15 @@ enum class DeviceType {
             else -> R.drawable.ic_device_desktop_32dp
         }
 
+    fun toShortcutDrawableId() =
+        when (this) {
+            PHONE -> R.drawable.ic_device_phone_shortcut
+            TABLET -> R.drawable.ic_device_tablet_shortcut
+            TV -> R.drawable.ic_device_tv_shortcut
+            LAPTOP -> R.drawable.ic_device_laptop_shortcut
+            else -> R.drawable.ic_device_desktop_shortcut
+        }
+
     companion object {
         @JvmStatic
         fun fromString(s: String) =

src/org/kde/kdeconnect/Plugins/SharePlugin/ShareActivity.java

@@ -8,6 +8,7 @@ package org.kde.kdeconnect.Plugins.SharePlugin;
 
 import android.content.Intent;
 import android.content.SharedPreferences;
+import android.os.Build;
 import android.os.Bundle;
 import android.view.Menu;
 import android.view.MenuInflater;
@@ -160,7 +161,10 @@ public class ShareActivity extends AppCompatActivity {
         super.onStart();
 
         final Intent intent = getIntent();
-        final String deviceId = intent.getStringExtra("deviceId");
+        String deviceId = intent.getStringExtra("deviceId");
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q && deviceId == null) {
+            deviceId = intent.getStringExtra(Intent.EXTRA_SHORTCUT_ID);
+        }
 
         if (deviceId != null) {
             SharePlugin plugin = KdeConnect.getInstance().getDevicePlugin(deviceId, SharePlugin.class);

src/org/kde/kdeconnect/Plugins/SharePlugin/SharePlugin.java

@@ -24,6 +24,10 @@ import androidx.annotation.DrawableRes;
 import androidx.annotation.NonNull;
 import androidx.annotation.WorkerThread;
 import androidx.core.content.ContextCompat;
+import androidx.core.content.LocusIdCompat;
+import androidx.core.content.pm.ShortcutInfoCompat;
+import androidx.core.content.pm.ShortcutManagerCompat;
+import androidx.core.graphics.drawable.IconCompat;
 import androidx.preference.PreferenceManager;
 
 import org.apache.commons.lang3.ArrayUtils;
@@ -33,6 +37,7 @@ import org.kde.kdeconnect.Helpers.IntentHelper;
 import org.kde.kdeconnect.NetworkPacket;
 import org.kde.kdeconnect.Plugins.Plugin;
 import org.kde.kdeconnect.Plugins.PluginFactory;
+import org.kde.kdeconnect.UserInterface.MainActivity;
 import org.kde.kdeconnect.UserInterface.PluginSettingsFragment;
 import org.kde.kdeconnect.async.BackgroundJob;
 import org.kde.kdeconnect.async.BackgroundJobHandler;
@@ -43,6 +48,7 @@ import java.net.URISyntaxException;
 import java.net.URL;
 import java.util.ArrayList;
 import java.util.Collections;
+import java.util.List;
 import java.util.Set;
 
 /**
@@ -84,11 +90,34 @@ public class SharePlugin extends Plugin {
     public boolean onCreate() {
         super.onCreate();
         mSharedPrefs = PreferenceManager.getDefaultSharedPreferences(context);
+
+        Intent shortcutIntent = new Intent(context, MainActivity.class);
+        shortcutIntent.setAction(Intent.ACTION_VIEW);
+        shortcutIntent.putExtra(MainActivity.EXTRA_DEVICE_ID, device.getDeviceId());
+
+        IconCompat icon = IconCompat.createWithResource(context, device.getDeviceType().toShortcutDrawableId());
+
+        ShortcutInfoCompat shortcut = new ShortcutInfoCompat
+                .Builder(context, device.getDeviceId())
+                .setIntent(shortcutIntent)
+                .setIcon(icon)
+                .setShortLabel(device.getName())
+                .setCategories(Set.of("org.kde.kdeconnect.category.SHARE_TARGET"))
+                .setLocusId(new LocusIdCompat(device.getDeviceId()))
+                .build();
+        ShortcutManagerCompat.pushDynamicShortcut(context, shortcut);
+
         // Deliver URLs previously shared to this device now that it's connected
         deliverPreviouslySentIntents();
         return true;
     }
 
+    @Override
+    public void onDestroy() {
+        ShortcutManagerCompat.removeLongLivedShortcuts(context, List.of(device.getDeviceId()));
+        super.onDestroy();
+    }
+
     private void deliverPreviouslySentIntents() {
         Set<String> currentUrlSet = mSharedPrefs.getStringSet(KEY_UNREACHABLE_URL_LIST + device.getDeviceId(), null);
         if (currentUrlSet != null) {