Add controller for battery saver button

Bug: 72228477
Test: RunSettingsRoboTests
Change-Id: Iae9096a10553ea761d099e1e72c1de56b693bac0

src/com/android/settings/widget/TwoStateButtonPreference.java

@@ -0,0 +1,62 @@
+/*
+ * Copyright (C) 2018 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.widget;
+
+import android.content.Context;
+import android.content.res.TypedArray;
+import android.support.v4.content.res.TypedArrayUtils;
+import android.util.AttributeSet;
+import android.widget.Button;
+
+import com.android.settings.R;
+import com.android.settings.applications.LayoutPreference;
+
+/**
+ * Preference that presents a button with two states(On vs Off)
+ */
+public class TwoStateButtonPreference extends LayoutPreference {
+    public TwoStateButtonPreference(Context context, AttributeSet attrs) {
+        super(context, attrs, TypedArrayUtils.getAttr(
+                context, R.attr.twoStateButtonPreferenceStyle, android.R.attr.preferenceStyle));
+
+        if (attrs != null) {
+            final TypedArray styledAttrs = context.obtainStyledAttributes(attrs,
+                    R.styleable.TwoStateButtonPreference);
+            final int textOnId = styledAttrs.getResourceId(
+                    R.styleable.TwoStateButtonPreference_textOn,
+                    R.string.summary_placeholder);
+            final int textOffId = styledAttrs.getResourceId(
+                    R.styleable.TwoStateButtonPreference_textOff,
+                    R.string.summary_placeholder);
+            styledAttrs.recycle();
+
+            final Button buttonOn = getStateOnButton();
+            buttonOn.setText(textOnId);
+            final Button buttonOff = getStateOffButton();
+            buttonOff.setText(textOffId);
+        }
+    }
+
+    public Button getStateOnButton() {
+        return findViewById(R.id.state_on_button);
+    }
+
+
+    public Button getStateOffButton() {
+        return findViewById(R.id.state_off_button);
+    }
+}

src/com/android/settings/widget/TwoStateButtonPreferenceController.java

@@ -0,0 +1,73 @@
+/*
+ * Copyright (C) 2018 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.widget;
+
+import android.content.Context;
+import android.support.v7.preference.PreferenceScreen;
+import android.view.View;
+import android.widget.Button;
+
+import com.android.settings.R;
+import com.android.settings.core.BasePreferenceController;
+
+/**
+ * Controller to update the button with two states(On vs Off).
+ */
+public abstract class TwoStateButtonPreferenceController extends BasePreferenceController
+        implements View.OnClickListener {
+    private Button mButtonOn;
+    private Button mButtonOff;
+
+    public TwoStateButtonPreferenceController(Context context, String key) {
+        super(context, key);
+    }
+
+    @Override
+    public void displayPreference(PreferenceScreen screen) {
+        super.displayPreference(screen);
+        final TwoStateButtonPreference preference =
+                (TwoStateButtonPreference) screen.findPreference(getPreferenceKey());
+        mButtonOn = preference.getStateOnButton();
+        mButtonOn.setOnClickListener(this);
+        mButtonOff = preference.getStateOffButton();
+        mButtonOff.setOnClickListener(this);
+    }
+
+    protected void updateButton(boolean stateOn) {
+        if (stateOn) {
+            mButtonOff.setVisibility(View.GONE);
+            mButtonOn.setVisibility(View.VISIBLE);
+        } else {
+            mButtonOff.setVisibility(View.VISIBLE);
+            mButtonOn.setVisibility(View.GONE);
+        }
+    }
+
+    @Override
+    public void onClick(View v) {
+        final boolean stateOn = v.getId() == R.id.state_on_button;
+        onButtonClicked(stateOn);
+    }
+
+    /**
+     * Callback when button is clicked
+     *
+     * @param stateOn {@code true} if stateOn button is clicked, otherwise it means stateOff
+     *                button is clicked
+     */
+    public abstract void onButtonClicked(boolean stateOn);
+}