ImmersiveModeFragment.java

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/*
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* Copyright (C) 2012 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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*      http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.example.android.immersivemode;
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import android.os.Build;
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import android.os.Bundle;
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import android.support.v4.app.Fragment;
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import android.view.MenuItem;
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import android.view.View;
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import com.example.android.common.logger.Log;
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public class ImmersiveModeFragment extends Fragment {
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    public static final String TAG = "ImmersiveModeFragment";
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    @Override
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    public void onCreate(Bundle savedInstanceState) {
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        super.onCreate(savedInstanceState);
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        setHasOptionsMenu(true);
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    }
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    @Override
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    public void onActivityCreated(Bundle savedInstanceState) {
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        super.onActivityCreated(savedInstanceState);
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        final View decorView = getActivity().getWindow().getDecorView();
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        decorView.setOnSystemUiVisibilityChangeListener(
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                new View.OnSystemUiVisibilityChangeListener() {
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                    @Override
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                    public void onSystemUiVisibilityChange(int i) {
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                        int height = decorView.getHeight();
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                        Log.i(TAG, "Current height: " + height);
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                    }
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                });
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    }
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    @Override
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    public boolean onOptionsItemSelected(MenuItem item) {
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        if (item.getItemId() == R.id.sample_action) {
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            toggleHideyBar();
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        }
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        return true;
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    }
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    /**
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     * Detects and toggles immersive mode (also known as "hidey bar" mode).
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     */
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    public void toggleHideyBar() {
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        // The UI options currently enabled are represented by a bitfield.
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        // getSystemUiVisibility() gives us that bitfield.
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        int uiOptions = getActivity().getWindow().getDecorView().getSystemUiVisibility();
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        int newUiOptions = uiOptions;
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        boolean isImmersiveModeEnabled =
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                ((uiOptions | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY) == uiOptions);
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        if (isImmersiveModeEnabled) {
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            Log.i(TAG, "Turning immersive mode mode off. ");
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        } else {
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            Log.i(TAG, "Turning immersive mode mode on.");
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        }
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        // Navigation bar hiding:  Backwards compatible to ICS.
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        if (Build.VERSION.SDK_INT >= 14) {
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            newUiOptions ^= View.SYSTEM_UI_FLAG_HIDE_NAVIGATION;
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        }
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        // Status bar hiding: Backwards compatible to Jellybean
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        if (Build.VERSION.SDK_INT >= 16) {
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            newUiOptions ^= View.SYSTEM_UI_FLAG_FULLSCREEN;
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        }
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        // Immersive mode: Backward compatible to KitKat.
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        // Note that this flag doesn't do anything by itself, it only augments the behavior
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        // of HIDE_NAVIGATION and FLAG_FULLSCREEN.  For the purposes of this sample
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        // all three flags are being toggled together.
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        // Note that there are two immersive mode UI flags, one of which is referred to as "sticky".
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        // Sticky immersive mode differs in that it makes the navigation and status bars
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        // semi-transparent, and the UI flag does not get cleared when the user interacts with
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        // the screen.
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        if (Build.VERSION.SDK_INT >= 18) {
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            newUiOptions ^= View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY;
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        }
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        getActivity().getWindow().getDecorView().setSystemUiVisibility(newUiOptions);
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    }
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}