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SystemUiHiderHoneycomb.java

/*
 * Copyright (C) 2014 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.example.android.visualgamecontroller.util;

import android.annotation.TargetApi;
import android.app.Activity;
import android.os.Build;
import android.view.View;
import android.view.WindowManager;

/**
 * An API 11+ implementation of {@link SystemUiHider}. Uses APIs available in
 * Honeycomb and later (specifically {@link View#setSystemUiVisibility(int)}) to
 * show and hide the system UI.
 */
@TargetApi(Build.VERSION_CODES.HONEYCOMB)
public class SystemUiHiderHoneycomb extends SystemUiHiderBase {
    /**
     * Flags for {@link View#setSystemUiVisibility(int)} to use when showing the
     * system UI.
     */
    private int mShowFlags;

/**
     * Flags for {@link View#setSystemUiVisibility(int)} to use when hiding the
     * system UI.
     */
    private int mHideFlags;

/**
     * Flags to test against the first parameter in
     * {@link android.view.View.OnSystemUiVisibilityChangeListener#onSystemUiVisibilityChange(int)}
     * to determine the system UI visibility state.
     */
    private int mTestFlags;

/**
     * Whether or not the system UI is currently visible. This is cached from
     * {@link android.view.View.OnSystemUiVisibilityChangeListener}.
     */
    private boolean mVisible = true;

/**
     * Constructor not intended to be called by clients. Use
     * {@link SystemUiHider#getInstance} to obtain an instance.
     */
    protected SystemUiHiderHoneycomb(Activity activity, View anchorView, int flags) {
        super(activity, anchorView, flags);

mShowFlags = View.SYSTEM_UI_FLAG_VISIBLE;
        mHideFlags = View.SYSTEM_UI_FLAG_LOW_PROFILE;
        mTestFlags = View.SYSTEM_UI_FLAG_LOW_PROFILE;

if ((mFlags & FLAG_FULLSCREEN) != 0) {
            // If the client requested fullscreen, add flags relevant to hiding
            // the status bar. Note that some of these constants are new as of
            // API 16 (Jelly Bean). It is safe to use them, as they are inlined
            // at compile-time and do nothing on pre-Jelly Bean devices.
            mShowFlags |= View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN;
            mHideFlags |= View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
                    | View.SYSTEM_UI_FLAG_FULLSCREEN;
        }

if ((mFlags & FLAG_HIDE_NAVIGATION) != 0) {
            // If the client requested hiding navigation, add relevant flags.
            mShowFlags |= View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION;
            mHideFlags |= View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
                    | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION;
            mTestFlags |= View.SYSTEM_UI_FLAG_HIDE_NAVIGATION;
        }
    }

/** {@inheritDoc} */
    @Override
    public void setup() {
        mAnchorView.setOnSystemUiVisibilityChangeListener(mSystemUiVisibilityChangeListener);
    }

/** {@inheritDoc} */
    @Override
    public void hide() {
        mAnchorView.setSystemUiVisibility(mHideFlags);
    }

/** {@inheritDoc} */
    @Override
    public void show() {
        mAnchorView.setSystemUiVisibility(mShowFlags);
    }

/** {@inheritDoc} */
    @Override
    public boolean isVisible() {
        return mVisible;
    }

private View.OnSystemUiVisibilityChangeListener mSystemUiVisibilityChangeListener = new View.OnSystemUiVisibilityChangeListener() {
        @Override
        public void onSystemUiVisibilityChange(int vis) {
            // Test against mTestFlags to see if the system UI is visible.
            if ((vis & mTestFlags) != 0) {
                if (Build.VERSION.SDK_INT < Build.VERSION_CODES.JELLY_BEAN) {
                    // Pre-Jelly Bean, we must manually hide the action bar
                    // and use the old window flags API.
                    mActivity.getActionBar().hide();
                    mActivity.getWindow().setFlags(
                            WindowManager.LayoutParams.FLAG_FULLSCREEN,
                            WindowManager.LayoutParams.FLAG_FULLSCREEN);
                }

// Trigger the registered listener and cache the visibility
                // state.
                mOnVisibilityChangeListener.onVisibilityChange(false);
                mVisible = false;

} else {
                mAnchorView.setSystemUiVisibility(mShowFlags);
                if (Build.VERSION.SDK_INT < Build.VERSION_CODES.JELLY_BEAN) {
                    // Pre-Jelly Bean, we must manually show the action bar
                    // and use the old window flags API.
                    mActivity.getActionBar().show();
                    mActivity.getWindow().setFlags(
                            0,
                            WindowManager.LayoutParams.FLAG_FULLSCREEN);
                }

// Trigger the registered listener and cache the visibility
                // state.
                mOnVisibilityChangeListener.onVisibilityChange(true);
                mVisible = true;
            }
        }
    };
}