Use an EditTextPreference for changing the device name instead of an AlertDialog

res/values-v21/styles.xml

@@ -2,7 +2,7 @@
 <resources>
 
     <style name="KdeConnectTheme.NoActionBar" parent="KdeConnectThemeBase.NoActionBar">
-        <item name="android:windowTranslucentStatus">true</item>
+        <item name="android:statusBarColor">#65000000</item>
     </style>
 
 </resources>

res/values/styles.xml

@@ -14,6 +14,7 @@
         <item name="popupTheme">@style/ThemeOverlay.AppCompat.Light</item>
         <item name="mainNavigationViewStyle">@style/MainNavigationView</item>
         <item name="colorHighContrast">@android:color/black</item>
+        <!-- TODO: The 2 items below change to much (eg snackbar text is now black, should be white) -->
         <item name="android:textColorPrimary">@android:color/black</item>
         <item name="android:textColor">@android:color/black</item>
         <item name="preferenceTheme">@style/PreferenceThemeOverlay</item>

src/org/kde/kdeconnect/Helpers/DeviceHelper.java

@@ -35,7 +35,7 @@ import java.util.HashMap;
 
 public class DeviceHelper {
 
-    private static final String KEY_DEVICE_NAME_PREFERENCE = "device_name_preference";
+    public static final String KEY_DEVICE_NAME_PREFERENCE = "device_name_preference";
 
     //from https://github.com/meetup/android-device-names
     //Converted to java using:

src/org/kde/kdeconnect/UserInterface/MainActivity.java

@@ -6,13 +6,13 @@ import android.content.Intent;
 import android.content.SharedPreferences;
 import android.content.pm.PackageManager;
 import android.os.Bundle;
+import android.preference.PreferenceManager;
 import android.text.TextUtils;
 import android.util.Log;
 import android.view.Menu;
 import android.view.MenuItem;
 import android.view.SubMenu;
 import android.view.View;
-import android.widget.EditText;
 import android.widget.TextView;
 
 import com.google.android.material.navigation.NavigationView;
@@ -24,12 +24,9 @@ import org.kde.kdeconnect_tp.R;
 
 import java.util.Collection;
 import java.util.HashMap;
-import java.util.HashSet;
-import java.util.Set;
 
 import androidx.appcompat.app.ActionBar;
 import androidx.appcompat.app.ActionBarDrawerToggle;
-import androidx.appcompat.app.AlertDialog;
 import androidx.appcompat.app.AppCompatActivity;
 import androidx.appcompat.widget.Toolbar;
 import androidx.core.view.GravityCompat;
@@ -38,7 +35,7 @@ import androidx.fragment.app.Fragment;
 import butterknife.BindView;
 import butterknife.ButterKnife;
 
-public class MainActivity extends AppCompatActivity {
+public class MainActivity extends AppCompatActivity implements SharedPreferences.OnSharedPreferenceChangeListener {
 
     private static final int MENU_ENTRY_ADD_DEVICE = 1; //0 means no-selection
     private static final int MENU_ENTRY_SETTINGS = 2;
@@ -106,6 +103,7 @@ public class MainActivity extends AppCompatActivity {
         mNavViewDeviceName.setText(deviceName);
 
         preferences = getSharedPreferences("stored_menu_selection", Context.MODE_PRIVATE);
+        PreferenceManager.getDefaultSharedPreferences(this).registerOnSharedPreferenceChangeListener(this);
 
         mNavigationView.setNavigationItemSelectedListener(menuItem -> {
             mCurrentMenuEntry = menuItem.getItemId();
@@ -184,6 +182,13 @@ public class MainActivity extends AppCompatActivity {
         }
     }
 
+    @Override
+    protected void onDestroy() {
+        super.onDestroy();
+
+        PreferenceManager.getDefaultSharedPreferences(this).unregisterOnSharedPreferenceChangeListener(this);
+    }
+
     private String onPairResultFromNotification(String deviceId, String pairStatus) {
         assert(deviceId != null);
 
@@ -366,44 +371,15 @@ public class MainActivity extends AppCompatActivity {
         }
     }
 
-
+    @Override
-    interface NameChangeCallback {
+    public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) {
-        void onNameChanged(String newName);
+        switch (key) {
-    }
+            case DeviceHelper.KEY_DEVICE_NAME_PREFERENCE:
-
+                mNavViewDeviceName.setText(DeviceHelper.getDeviceName(this));
-    private final Set<NameChangeCallback> nameChangeSubscribers = new HashSet<>();
+                BackgroundService.RunCommand(this, BackgroundService::onNetworkChange);
-
+                break;
-    public void addNameChangeCallback(NameChangeCallback cb) {
+            default:
-        nameChangeSubscribers.add(cb);
+                break;
-    }
+        }
-
-    public void removeNameChangeCallback(NameChangeCallback cb) {
-        nameChangeSubscribers.remove(cb);
-    }
-
-    public void openRenameDeviceDialog(Context context) {
-        final EditText deviceNameEdit = new EditText(this);
-        String deviceName = DeviceHelper.getDeviceName(this);
-        deviceNameEdit.setText(deviceName);
-        float dpi = this.getResources().getDisplayMetrics().density;
-        deviceNameEdit.setPadding( ((int) (18 * dpi)), ((int) (16 * dpi)), ((int) (18 * dpi)), ((int) (12 * dpi)) );
-        new AlertDialog.Builder(context)
-                .setView(deviceNameEdit)
-                .setPositiveButton(R.string.device_rename_confirm, (dialog, which) -> {
-                    String newDeviceName = deviceNameEdit.getText().toString();
-                    DeviceHelper.setDeviceName(this, newDeviceName);
-                    this.updateDeviceNameFromMenu(newDeviceName);
-                    BackgroundService.RunCommand(this, BackgroundService::onNetworkChange);
-                    for (NameChangeCallback callback : nameChangeSubscribers) {
-                        callback.onNameChanged(newDeviceName);
-                    }
-                })
-                .setNegativeButton(R.string.cancel, (dialog, which) -> { })
-                .setTitle(R.string.device_rename_title)
-                .show();
-    }
-
-    private void updateDeviceNameFromMenu(String newDeviceName) {
-        mNavViewDeviceName.setText(newDeviceName);
     }
 }

src/org/kde/kdeconnect/UserInterface/SettingsFragment.java

@@ -6,28 +6,26 @@ import android.content.SharedPreferences;
 import android.os.Build;
 import android.os.Bundle;
 import android.preference.PreferenceManager;
+import android.text.TextUtils;
+
+import com.google.android.material.snackbar.Snackbar;
 
 import org.kde.kdeconnect.BackgroundService;
 import org.kde.kdeconnect.Helpers.DeviceHelper;
 import org.kde.kdeconnect.Helpers.NotificationHelper;
 import org.kde.kdeconnect_tp.R;
 
+import androidx.preference.EditTextPreference;
 import androidx.preference.Preference;
 import androidx.preference.PreferenceFragmentCompat;
 import androidx.preference.PreferenceScreen;
 import androidx.preference.SwitchPreferenceCompat;
 import androidx.preference.TwoStatePreference;
 
-public class SettingsFragment extends PreferenceFragmentCompat implements MainActivity.NameChangeCallback {
+public class SettingsFragment extends PreferenceFragmentCompat {
 
     private MainActivity mainActivity;
-    private Preference renameDevice;
+    private EditTextPreference renameDevice;
-
-    @Override
-    public void onDestroy() {
-        mainActivity.removeNameChangeCallback(this);
-        super.onDestroy();
-    }
 
     @Override
     public void onCreatePreferences(Bundle savedInstanceState, String rootKey) {
@@ -39,18 +37,30 @@ public class SettingsFragment extends PreferenceFragmentCompat implements MainAc
         SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
 
         // Rename device
-        mainActivity.addNameChangeCallback(this);
+        renameDevice = new EditTextPreference(context);
-        //TODO: Use an EditTextPreference
+        renameDevice.setKey(DeviceHelper.KEY_DEVICE_NAME_PREFERENCE);
-        renameDevice = new Preference(context);
-        renameDevice.setPersistent(false);
         renameDevice.setSelectable(true);
-        renameDevice.setOnPreferenceClickListener(preference -> {
-            mainActivity.openRenameDeviceDialog(context);
-            return true;
-        });
         String deviceName = DeviceHelper.getDeviceName(context);
         renameDevice.setTitle(R.string.settings_rename);
         renameDevice.setSummary(deviceName);
+        renameDevice.setDialogTitle(R.string.device_rename_title);
+        renameDevice.setText(deviceName);
+        renameDevice.setPositiveButtonText(R.string.device_rename_confirm);
+        renameDevice.setNegativeButtonText(R.string.cancel);
+        renameDevice.setOnPreferenceChangeListener((preference, newValue) -> {
+            String name = (String) newValue;
+
+            if (TextUtils.isEmpty(name)) {
+                if (getView() != null) {
+                    Snackbar.make(getView(), R.string.invalid_device_name, Snackbar.LENGTH_LONG).show();
+                }
+                return false;
+            }
+
+            renameDevice.setSummary((String)newValue);
+            return true;
+        });
+
         screen.addPreference(renameDevice);
 
 
@@ -122,10 +132,4 @@ public class SettingsFragment extends PreferenceFragmentCompat implements MainAc
 
 
     }
-
-    @Override
-    public void onNameChanged(String newName) {
-        renameDevice.setSummary(newName);
-    }
-
 }