Add "Show key presses" to input developer options

Bug: 283524254
Bug: 282005442
Test: atest ShowKeyPressesPreferenceControllerTest
Test: manual
Change-Id: I120c8bf607a6073938eda91975e247905982c94d

src/com/android/settings/development/DevelopmentSettingsDashboardFragment.java

@@ -670,6 +670,7 @@ public class DevelopmentSettingsDashboardFragment extends RestrictedDashboardFra
         controllers.add(new NfcVerboseVendorLogPreferenceController(context, fragment));
         controllers.add(new ShowTapsPreferenceController(context));
         controllers.add(new PointerLocationPreferenceController(context));
+        controllers.add(new ShowKeyPressesPreferenceController(context));
         controllers.add(new ShowSurfaceUpdatesPreferenceController(context));
         controllers.add(new ShowLayoutBoundsPreferenceController(context));
         controllers.add(new ShowRefreshRatePreferenceController(context));

src/com/android/settings/development/ShowKeyPressesPreferenceController.java

@@ -0,0 +1,72 @@
+/*
+ * Copyright 2023 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settings.development;
+
+import android.content.Context;
+import android.provider.Settings;
+
+import androidx.annotation.VisibleForTesting;
+import androidx.preference.Preference;
+import androidx.preference.SwitchPreference;
+
+import com.android.settings.core.PreferenceControllerMixin;
+import com.android.settingslib.development.DeveloperOptionsPreferenceController;
+
+/** PreferenceController that controls the "Show key presses" developer option. */
+public class ShowKeyPressesPreferenceController extends
+        DeveloperOptionsPreferenceController implements
+        Preference.OnPreferenceChangeListener, PreferenceControllerMixin {
+
+    private static final String SHOW_KEY_PRESSES_KEY = "show_key_presses";
+
+    @VisibleForTesting
+    static final int SETTING_VALUE_ON = 1;
+    @VisibleForTesting
+    static final int SETTING_VALUE_OFF = 0;
+
+    public ShowKeyPressesPreferenceController(Context context) {
+        super(context);
+    }
+
+    @Override
+    public String getPreferenceKey() {
+        return SHOW_KEY_PRESSES_KEY;
+    }
+
+    @Override
+    public boolean onPreferenceChange(Preference preference, Object newValue) {
+        final boolean isEnabled = (Boolean) newValue;
+        Settings.System.putInt(mContext.getContentResolver(),
+                Settings.System.SHOW_KEY_PRESSES, isEnabled ? SETTING_VALUE_ON : SETTING_VALUE_OFF);
+        return true;
+    }
+
+    @Override
+    public void updateState(Preference preference) {
+        int showKeyPresses = Settings.System.getInt(mContext.getContentResolver(),
+                Settings.System.SHOW_KEY_PRESSES, SETTING_VALUE_OFF);
+        ((SwitchPreference) mPreference).setChecked(showKeyPresses != SETTING_VALUE_OFF);
+    }
+
+    @Override
+    protected void onDeveloperOptionsSwitchDisabled() {
+        super.onDeveloperOptionsSwitchDisabled();
+        Settings.System.putInt(mContext.getContentResolver(), Settings.System.SHOW_KEY_PRESSES,
+                SETTING_VALUE_OFF);
+        ((SwitchPreference) mPreference).setChecked(false);
+    }
+}