Update MainSwitch widget.

- Fix the MainSwitchBar overlapping issue.
- Add setTitle method to support string resource id.
- Add setChecked method to fix the state of switch not sync issue.
- Get the resource id of title from xml.

Fix: 178425979
Test: Run robotest and apply the widget in Settings and see the ui
Change-Id: I332b017c6a6e32e5ea3929d4b3c7e81104445bcc

packages/SettingsLib/MainSwitchPreference/res/layout/main_switch_bar.xml

@@ -19,6 +19,7 @@
     xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_height="wrap_content"
     android:layout_width="match_parent"
+    android:background="?android:attr/colorBackground"
     android:orientation="vertical">
 
     <LinearLayout

packages/SettingsLib/MainSwitchPreference/src/com/android/settingslib/widget/MainSwitchBar.java

@@ -17,6 +17,7 @@
 package com.android.settingslib.widget;
 
 import android.content.Context;
+import android.content.res.TypedArray;
 import android.os.Parcel;
 import android.os.Parcelable;
 import android.util.AttributeSet;
@@ -29,6 +30,7 @@ import android.widget.Switch;
 import android.widget.TextView;
 
 import androidx.annotation.VisibleForTesting;
+import androidx.core.content.res.TypedArrayUtils;
 
 import com.android.settingslib.RestrictedLockUtils;
 
@@ -88,6 +90,17 @@ public class MainSwitchBar extends LinearLayout implements CompoundButton.OnChec
         });
 
         setChecked(mSwitch.isChecked());
+
+        if (attrs != null) {
+            final TypedArray a = context.obtainStyledAttributes(attrs,
+                    androidx.preference.R.styleable.Preference, 0 /*defStyleAttr*/,
+                    0 /*defStyleRes*/);
+            final CharSequence title = TypedArrayUtils.getText(a,
+                    androidx.preference.R.styleable.Preference_title,
+                    androidx.preference.R.styleable.Preference_android_title);
+            setTitle(title);
+            a.recycle();
+        }
     }
 
     @Override
@@ -126,7 +139,7 @@ public class MainSwitchBar extends LinearLayout implements CompoundButton.OnChec
     /**
      * Set the title text
      */
-    public void setTitle(String text) {
+    public void setTitle(CharSequence text) {
         if (mTextView != null) {
             mTextView.setText(text);
         }

packages/SettingsLib/MainSwitchPreference/src/com/android/settingslib/widget/MainSwitchPreference.java

@@ -18,7 +18,6 @@ package com.android.settingslib.widget;
 
 import android.content.Context;
 import android.content.res.TypedArray;
-import android.text.TextUtils;
 import android.util.AttributeSet;
 
 import androidx.core.content.res.TypedArrayUtils;
@@ -40,7 +39,7 @@ public class MainSwitchPreference extends TwoStatePreference {
     private final List<OnMainSwitchChangeListener> mSwitchChangeListeners = new ArrayList<>();
 
     private MainSwitchBar mMainSwitchBar;
-    private String mTitle;
+    private CharSequence mTitle;
 
     private RestrictedLockUtils.EnforcedAdmin mEnforcedAdmin;
 
@@ -81,24 +80,28 @@ public class MainSwitchPreference extends TwoStatePreference {
         setLayoutResource(R.layout.main_switch_layout);
 
         if (attrs != null) {
-            TypedArray a = context.obtainStyledAttributes(attrs,
+            final TypedArray a = context.obtainStyledAttributes(attrs,
                     androidx.preference.R.styleable.Preference, 0 /*defStyleAttr*/,
                     0 /*defStyleRes*/);
             final CharSequence title = TypedArrayUtils.getText(a,
                     androidx.preference.R.styleable.Preference_title,
                     androidx.preference.R.styleable.Preference_android_title);
-            if (!TextUtils.isEmpty(title)) {
-                setTitle(title.toString());
-            }
+            setTitle(title);
             a.recycle();
         }
     }
 
-    /**
-     * Set the preference title text
-     */
-    public void setTitle(String text) {
-        mTitle = text;
+    @Override
+    public void setChecked(boolean checked) {
+        super.setChecked(checked);
+        if (mMainSwitchBar != null) {
+            mMainSwitchBar.setChecked(checked);
+        }
+    }
+
+    @Override
+    public void setTitle(CharSequence title) {
+        mTitle = title;
         if (mMainSwitchBar != null) {
             mMainSwitchBar.setTitle(mTitle);
         }