Deprecate AppListPreference and AppListPrefWithSettings

- Convert ManageAssist into DashboardFragment
- Convert default assist pref to DefaultAppPickerFragment
- Add PreferenceController for each pref
- Add tests

Bug: 35203386
Test: make RunSettingsRoboTests

Change-Id: I0350a06cae7457809fb261e2d8ec99eda80cc50a

src/com/android/settings/applications/assist/AssistFlashScreenPreferenceController.java

@@ -0,0 +1,158 @@
+/*
+ * 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.assist;
+
+import android.content.ComponentName;
+import android.content.Context;
+import android.net.Uri;
+import android.os.UserHandle;
+import android.provider.Settings;
+import android.support.v7.preference.Preference;
+import android.support.v7.preference.PreferenceScreen;
+import android.support.v7.preference.TwoStatePreference;
+
+import com.android.internal.annotations.VisibleForTesting;
+import com.android.internal.app.AssistUtils;
+import com.android.settings.core.PreferenceController;
+import com.android.settings.core.lifecycle.Lifecycle;
+import com.android.settings.core.lifecycle.LifecycleObserver;
+import com.android.settings.core.lifecycle.events.OnPause;
+import com.android.settings.core.lifecycle.events.OnResume;
+
+import java.util.Arrays;
+import java.util.List;
+
+public class AssistFlashScreenPreferenceController extends PreferenceController
+        implements Preference.OnPreferenceChangeListener, LifecycleObserver, OnResume, OnPause {
+
+    private static final String KEY_FLASH = "flash";
+
+    private final AssistUtils mAssistUtils;
+    private final SettingObserver mSettingObserver;
+    private PreferenceScreen mScreen;
+    private Preference mPreference;
+
+    public AssistFlashScreenPreferenceController(Context context, Lifecycle lifecycle) {
+        super(context);
+        mAssistUtils = new AssistUtils(context);
+        mSettingObserver = new SettingObserver();
+
+        if (lifecycle != null) {
+            lifecycle.addObserver(this);
+        }
+    }
+
+    @Override
+    public boolean isAvailable() {
+        return getCurrentAssist() != null && allowDisablingAssistDisclosure();
+    }
+
+    @Override
+    public String getPreferenceKey() {
+        return KEY_FLASH;
+    }
+
+    @Override
+    public void displayPreference(PreferenceScreen screen) {
+        mScreen = screen;
+        mPreference = screen.findPreference(getPreferenceKey());
+        super.displayPreference(screen);
+    }
+
+    @Override
+    public void onResume() {
+        mSettingObserver.register(mContext.getContentResolver(), true);
+        updatePreference();
+    }
+
+    @Override
+    public void updateState(Preference preference) {
+        updatePreference();
+    }
+
+    @Override
+    public void onPause() {
+        mSettingObserver.register(mContext.getContentResolver(), false);
+    }
+
+    @Override
+    public boolean onPreferenceChange(Preference preference, Object newValue) {
+        Settings.Secure.putInt(mContext.getContentResolver(),
+                Settings.Secure.ASSIST_DISCLOSURE_ENABLED,
+                (boolean) newValue ? 1 : 0);
+        return true;
+    }
+
+    private void updatePreference() {
+        if (mPreference == null || !(mPreference instanceof TwoStatePreference)) {
+            return;
+        }
+        if (isAvailable()) {
+            if (mScreen.findPreference(getPreferenceKey()) == null) {
+                // add it if it's not on scree
+                mScreen.addPreference(mPreference);
+            }
+        } else {
+            mScreen.removePreference(mPreference);
+        }
+        ComponentName assistant = getCurrentAssist();
+
+        boolean isContextChecked = AssistContextPreferenceController.isChecked(mContext);
+
+        mPreference.setEnabled(isContextChecked && isPreInstalledAssistant(assistant));
+        ((TwoStatePreference) mPreference).setChecked(willShowFlash(assistant));
+    }
+
+    @VisibleForTesting
+    boolean willShowFlash(ComponentName assistant) {
+        return AssistUtils.shouldDisclose(mContext, assistant);
+    }
+
+    @VisibleForTesting
+    boolean isPreInstalledAssistant(ComponentName assistant) {
+        return AssistUtils.isPreinstalledAssistant(mContext, assistant);
+    }
+
+    @VisibleForTesting
+    boolean allowDisablingAssistDisclosure() {
+        return AssistUtils.allowDisablingAssistDisclosure(mContext);
+    }
+
+    private ComponentName getCurrentAssist() {
+        return mAssistUtils.getAssistComponentForUser(UserHandle.myUserId());
+    }
+
+    class SettingObserver extends AssistSettingObserver {
+
+        private final Uri URI =
+                Settings.Secure.getUriFor(Settings.Secure.ASSIST_DISCLOSURE_ENABLED);
+        private final Uri CONTEXT_URI =
+                Settings.Secure.getUriFor(Settings.Secure.ASSIST_STRUCTURE_ENABLED);
+
+        @Override
+        protected List<Uri> getSettingUris() {
+            return Arrays.asList(URI, CONTEXT_URI);
+        }
+
+        @Override
+        public void onSettingChange() {
+            updatePreference();
+        }
+    }
+
+
+}