Java tutorial
/* * Copyright (C) 2016 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.settingslib; import android.content.Context; import android.os.UserHandle; import android.support.v4.content.res.TypedArrayUtils; import android.support.v7.preference.Preference; import android.support.v7.preference.PreferenceManager; import android.support.v7.preference.PreferenceViewHolder; import android.util.AttributeSet; import android.view.View; import static com.android.settingslib.RestrictedLockUtils.EnforcedAdmin; /** * Preference class that supports being disabled by a user restriction * set by a device admin. */ public class RestrictedPreference extends Preference { RestrictedPreferenceHelper mHelper; public RestrictedPreference(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) { super(context, attrs, defStyleAttr, defStyleRes); setWidgetLayoutResource(R.layout.restricted_icon); mHelper = new RestrictedPreferenceHelper(context, this, attrs); } public RestrictedPreference(Context context, AttributeSet attrs, int defStyleAttr) { this(context, attrs, defStyleAttr, 0); } public RestrictedPreference(Context context, AttributeSet attrs) { this(context, attrs, TypedArrayUtils.getAttr(context, android.support.v7.preference.R.attr.preferenceStyle, android.R.attr.preferenceStyle)); } public RestrictedPreference(Context context) { this(context, null); } @Override public void onBindViewHolder(PreferenceViewHolder holder) { super.onBindViewHolder(holder); mHelper.onBindViewHolder(holder); final View restrictedIcon = holder.findViewById(R.id.restricted_icon); if (restrictedIcon != null) { restrictedIcon.setVisibility(isDisabledByAdmin() ? View.VISIBLE : View.GONE); } } @Override public void performClick() { if (!mHelper.performClick()) { super.performClick(); } } public void useAdminDisabledSummary(boolean useSummary) { mHelper.useAdminDisabledSummary(useSummary); } @Override protected void onAttachedToHierarchy(PreferenceManager preferenceManager) { mHelper.onAttachedToHierarchy(); super.onAttachedToHierarchy(preferenceManager); } public void checkRestrictionAndSetDisabled(String userRestriction) { mHelper.checkRestrictionAndSetDisabled(userRestriction, UserHandle.myUserId()); } public void checkRestrictionAndSetDisabled(String userRestriction, int userId) { mHelper.checkRestrictionAndSetDisabled(userRestriction, userId); } @Override public void setEnabled(boolean enabled) { if (enabled && isDisabledByAdmin()) { mHelper.setDisabledByAdmin(null); return; } super.setEnabled(enabled); } public void setDisabledByAdmin(EnforcedAdmin admin) { if (mHelper.setDisabledByAdmin(admin)) { notifyChanged(); } } public boolean isDisabledByAdmin() { return mHelper.isDisabledByAdmin(); } }