Implement deletion of OSC settings

app/src/main/java/com/limelight/preferences/ConfirmDeleteOscPreference.java

@@ -0,0 +1,41 @@
+package com.limelight.preferences;
+
+import android.annotation.TargetApi;
+import android.content.Context;
+import android.content.DialogInterface;
+import android.content.SharedPreferences;
+import android.os.Build;
+import android.preference.DialogPreference;
+import android.util.AttributeSet;
+import android.widget.Toast;
+
+import com.limelight.R;
+
+import static com.limelight.binding.input.virtual_controller.VirtualControllerConfigurationLoader.OSC_PREFERENCE;
+
+public class ConfirmDeleteOscPreference extends DialogPreference {
+    @TargetApi(Build.VERSION_CODES.LOLLIPOP)
+    public ConfirmDeleteOscPreference(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
+        super(context, attrs, defStyleAttr, defStyleRes);
+    }
+
+    public ConfirmDeleteOscPreference(Context context, AttributeSet attrs, int defStyleAttr) {
+        super(context, attrs, defStyleAttr);
+    }
+
+    public ConfirmDeleteOscPreference(Context context, AttributeSet attrs) {
+        super(context, attrs);
+    }
+
+    @TargetApi(Build.VERSION_CODES.LOLLIPOP)
+    public ConfirmDeleteOscPreference(Context context) {
+        super(context);
+    }
+
+    public void onClick(DialogInterface dialog, int which) {
+        if (which == DialogInterface.BUTTON_POSITIVE) {
+            getContext().getSharedPreferences(OSC_PREFERENCE, Context.MODE_PRIVATE).edit().clear().apply();
+            Toast.makeText(getContext(), R.string.toast_reset_osc_success, Toast.LENGTH_SHORT).show();
+        }
+    }
+}

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

@@ -136,6 +136,11 @@
     <string name="summary_checkbox_show_onscreen_controls">Show virtual controller overlay on touchscreen</string>
     <string name="title_only_l3r3">Only show L3 and R3</string>
     <string name="summary_only_l3r3">Hide all virtual buttons except L3 and R3</string>
+    <string name="title_reset_osc">Clear saved on-screen controls layout</string>
+    <string name="summary_reset_osc">Resets all on-screen controls to their default size and position</string>
+    <string name="dialog_title_reset_osc">Reset Layout</string>
+    <string name="dialog_text_reset_osc">Are you sure you want to delete your saved on-screen controls layout?</string>
+    <string name="toast_reset_osc_success">On-screen controls reset to default</string>
 
     <string name="category_ui_settings">UI Settings</string>
     <string name="title_language_list">Language</string>

app/src/main/res/xml/preferences.xml

@@ -84,6 +84,15 @@
             android:key="checkbox_only_show_L3R3"
             android:summary="@string/summary_only_l3r3"
             android:title="@string/title_only_l3r3" />
+        <com.limelight.preferences.ConfirmDeleteOscPreference
+            android:title="@string/title_reset_osc"
+            android:summary="@string/summary_reset_osc"
+            android:dialogTitle="@string/dialog_title_reset_osc"
+            android:dialogMessage="@string/dialog_text_reset_osc"
+            android:positiveButtonText="@string/yes"
+            android:negativeButtonText="@string/no"
+            />
+
     </PreferenceCategory>
     <PreferenceCategory android:title="@string/category_host_settings">
         <CheckBoxPreference