Fix disable/force stop app button incorrect state.

The LayoutPreference calls super.onBindPreview, which enables all
children views. This is usually fine because a Preference object has
just one click target. But the LayoutPreference can hold multiple click
targets so we should not force enable everything during every single
bind.

To fix this, we don't call super.onBind, and manually wire up
onClickListener and selectable/focusable state. Everything else from
super.onBind is useless to this preference type.

Change-Id: Ibb89f1be399311b9ee053733a050f04be6aa85e8
Fix: 37452204
Fix: 37538936
Fix: 35633637
Test: make RunSettingsRoboTests

src/com/android/settings/applications/LayoutPreference.java

@@ -18,6 +18,7 @@ package com.android.settings.applications;
 
 import android.content.Context;
 import android.content.res.TypedArray;
+import android.support.annotation.VisibleForTesting;
 import android.support.v7.preference.Preference;
 import android.support.v7.preference.PreferenceViewHolder;
 import android.util.AttributeSet;
@@ -31,7 +32,10 @@ import com.android.settings.Utils;
 
 public class LayoutPreference extends Preference {
 
-    private View mRootView;
+    private final View.OnClickListener mClickListener = v -> performClick(v);
+
+    @VisibleForTesting
+    View mRootView;
 
     public LayoutPreference(Context context, AttributeSet attrs) {
         super(context, attrs);
@@ -59,7 +63,7 @@ public class LayoutPreference extends Preference {
 
     private void setView(View view) {
         setLayoutResource(R.layout.layout_preference_frame);
-        final ViewGroup allDetails = (ViewGroup) view.findViewById(R.id.all_details);
+        final ViewGroup allDetails = view.findViewById(R.id.all_details);
         if (allDetails != null) {
             Utils.forceCustomPadding(allDetails, true /* additive padding */);
         }
@@ -68,9 +72,14 @@ public class LayoutPreference extends Preference {
     }
 
     @Override
-    public void onBindViewHolder(PreferenceViewHolder view) {
+    public void onBindViewHolder(PreferenceViewHolder holder) {
-        super.onBindViewHolder(view);
+        holder.itemView.setOnClickListener(mClickListener);
-        FrameLayout layout = (FrameLayout) view.itemView;
+
+        final boolean selectable = isSelectable();
+        holder.itemView.setFocusable(selectable);
+        holder.itemView.setClickable(selectable);
+
+        FrameLayout layout = (FrameLayout) holder.itemView;
         layout.removeAllViews();
         ViewGroup parent = (ViewGroup) mRootView.getParent();
         if (parent != null) {

tests/robotests/src/com/android/settings/applications/LayoutPreferenceTest.java

@@ -0,0 +1,90 @@
+/*
+ * Copyright (C) 2017 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.applications;
+
+import static com.google.common.truth.Truth.assertThat;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.verify;
+
+import android.content.Context;
+import android.support.v7.preference.Preference.OnPreferenceClickListener;
+import android.support.v7.preference.PreferenceViewHolder;
+import android.view.LayoutInflater;
+import android.view.View;
+
+import com.android.settings.R;
+import com.android.settings.SettingsRobolectricTestRunner;
+import com.android.settings.TestConfig;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.robolectric.RuntimeEnvironment;
+import org.robolectric.annotation.Config;
+
+@RunWith(SettingsRobolectricTestRunner.class)
+@Config(manifest = TestConfig.MANIFEST_PATH, sdk = TestConfig.SDK_VERSION)
+public class LayoutPreferenceTest {
+
+    private Context mContext;
+    private LayoutPreference mPreference;
+    private View mRootView;
+    private PreferenceViewHolder mHolder;
+
+    @Before
+    public void setUp() {
+        mContext = RuntimeEnvironment.application;
+        mPreference = new LayoutPreference(mContext, R.layout.app_action_buttons);
+        mRootView = mPreference.mRootView;
+        mHolder = PreferenceViewHolder.createInstanceForTests(LayoutInflater.from(mContext)
+                .inflate(R.layout.layout_preference_frame, null, false));
+    }
+
+    @Test
+    public void setOnClickListener_shouldAttachToRootView() {
+        final OnPreferenceClickListener listener = mock(OnPreferenceClickListener.class);
+
+        mPreference.setOnPreferenceClickListener(listener);
+        mPreference.onBindViewHolder(mHolder);
+
+        mHolder.itemView.callOnClick();
+
+        verify(listener).onPreferenceClick(mPreference);
+        assertThat(mHolder.itemView.isFocusable()).isTrue();
+        assertThat(mHolder.itemView.isClickable()).isTrue();
+    }
+
+    @Test
+    public void setNonSelectable_viewShouldNotBeSelectable() {
+        mPreference.setSelectable(false);
+        mPreference.onBindViewHolder(mHolder);
+
+        assertThat(mHolder.itemView.isFocusable()).isFalse();
+        assertThat(mHolder.itemView.isClickable()).isFalse();
+    }
+
+    @Test
+    public void disableSomeView_shouldMaintainStateAfterBind() {
+        mPreference.findViewById(R.id.left_button).setEnabled(false);
+        mPreference.findViewById(R.id.right_button).setEnabled(true);
+
+        mPreference.onBindViewHolder(mHolder);
+
+        assertThat(mPreference.findViewById(R.id.left_button).isEnabled()).isFalse();
+        assertThat(mPreference.findViewById(R.id.right_button).isEnabled()).isTrue();
+    }
+}