Android11 AOSP Settings设置项没有阴影（遥控器操控）

前言

原本的AOSP Settings对遥控器的适配不太行，很多地方遥控器移过去，当聚焦到某一个设置项的时候会没有阴影聚焦框。这里对部分聚焦框的改动进行总结。

Preference有onBindViewHolder方法的

以蓝牙配对界面识别到的蓝牙列表项为例。这种只需要在onBindViewHolder中加监听就好了，十分简单。

阴影框：
packages/apps/Settings/src/com/android/settings/bluetooth/BluetoothDevicePreference.java

@@ -47,6 +47,7 @@ import com.android.settingslib.core.instrumentation.MetricsFeatureProvider;

 import java.lang.annotation.Retention;
 import java.lang.annotation.RetentionPolicy;
+import android.graphics.Color;

 /**
  * BluetoothDevicePreference is the preference type used to display each remote
@@ -206,6 +207,17 @@ public final class BluetoothDevicePreference extends GearPreference {

     @Override
     public void onBindViewHolder(PreferenceViewHolder view) {
+        final View rootView = view.itemView;
+        rootView.setOnFocusChangeListener(new View.OnFocusChangeListener() {
+            @Override
+            public void onFocusChange(View v, boolean hasFocus) {
+                if (hasFocus) {
+                    rootView.setBackgroundColor(Color.argb(60, 128, 128, 128));
+                } else {
+                    rootView.setBackgroundColor(Color.argb(0, 0, 0, 0));
+                }
+            }
+        });
         // Disable this view if the bluetooth enable/disable preference view is off
         if (null != findPreferenceInHierarchy("bt_checkbox")) {
             setDependency("bt_checkbox");

点击事件：
packages/apps/Settings/src/com/android/settings/bluetooth/BluetoothDevicePreference.java

@@ -48,6 +48,7 @@ import com.android.settingslib.core.instrumentation.MetricsFeatureProvider;
 import java.lang.annotation.Retention;
 import java.lang.annotation.RetentionPolicy;
 import android.graphics.Color;
+import android.view.KeyEvent;

 /**
  * BluetoothDevicePreference is the preference type used to display each remote
@@ -208,6 +209,18 @@ public final class BluetoothDevicePreference extends GearPreference {
     @Override
     public void onBindViewHolder(PreferenceViewHolder view) {
         final View rootView = view.itemView;
+        rootView.setOnKeyListener(new View.OnKeyListener() {
+            @Override
+            public boolean onKey(View v, int keyCode, KeyEvent event) {
+                if (event.getKeyCode()  == KeyEvent.KEYCODE_ENTER || event.getKeyCode()  == KeyEvent.KEYCODE_DPAD_CENTER) {
+                    ImageView imageView = (ImageView) view.findViewById(R.id.settings_button);
+                    if (imageView != null) {
+                        imageView.performClick();
+                    }
+                }
+                return false;
+            }
+        });
         rootView.setOnFocusChangeListener(new View.OnFocusChangeListener() {
             @Override
             public void onFocusChange(View v, boolean hasFocus) {

MasterSwitchPreference
在packages/apps/Settings/res/xml/network_and_internet.xml有好几个是MasterSwitchPreference类型的，这里我们统一修改packages/apps/Settings/src/com/android/settings/widget/MasterSwitchPreference.java
@@ -30,6 +30,7 @@ import androidx.preference.PreferenceViewHolder;
 import com.android.settings.R;
 import com.android.settingslib.RestrictedLockUtils.EnforcedAdmin;
 import com.android.settingslib.RestrictedPreference;
+import android.graphics.Color;

 /**
  * A custom preference that provides inline switch toggle. It has a mandatory field for title, and
@@ -97,6 +98,18 @@ public class MasterSwitchPreference extends RestrictedPreference {
             mSwitch.setChecked(mChecked);
             mSwitch.setEnabled(mEnableSwitch);
         }
+
+        final View rootView = holder.itemView;
+        rootView.setOnFocusChangeListener(new View.OnFocusChangeListener() {
+            @Override
+            public void onFocusChange(View v, boolean hasFocus) {
+                if (hasFocus) {
+                    rootView.setBackgroundColor(Color.argb(50, 128, 128, 128));
+                } else {
+                    rootView.setBackgroundColor(Color.argb(0, 0, 0, 0));
+                }
+            }
+        });
     }

     public boolean isChecked() {

RestrictedPreference

这个是xml中的com.android.settingslib.RestrictedPreference ，比如packages/apps/Settings/res/xml/network_and_internet.xml中的vpn_settings 就是这一类，这种直接将这个Preference改了。

--- a/packages/apps/Settings/res/xml/connected_devices.xml
+++ b/packages/apps/Settings/res/xml/connected_devices.xml
@@ -41,7 +41,7 @@
         android:title="@string/connected_device_other_device_title"
         settings:controller="com.android.settings.connecteddevice.ConnectedDeviceGroupController"/>

-    <com.android.settingslib.RestrictedPreference
+    <Preference
         android:key="add_bt_devices"
         android:title="@string/bluetooth_pairing_pref_title"
         android:icon="@drawable/ic_add_24dp"
diff --git a/packages/apps/Settings/res/xml/network_and_internet.xml b/packages/apps/Settings/res/xml/network_and_internet.xml
index 6bf6dbaccf..421729e81b 100644
--- a/packages/apps/Settings/res/xml/network_and_internet.xml
+++ b/packages/apps/Settings/res/xml/network_and_internet.xml
@@ -99,7 +99,7 @@
         android:order="10"
         android:fragment="com.android.settings.datausage.DataSaverSummary"/>

-    <com.android.settingslib.RestrictedPreference
+    <com.android.settings.datausage.DataSaverPreference
         android:fragment="com.android.settings.vpn2.VpnSettings"
         android:key="vpn_settings"
         android:title="@string/vpn_settings_title"

我这边尝试过改成Preference或者com.android.settings.datausage.DataSaverPreference都直接成功，功能没有受到影响，当然这种粗狂的修改方式很不推荐，如果时间充裕还是仔细研究一下代码修改比较好。