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POPermanently hide Navigation Bar in an activity
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  1. POPermanently hide Navigation Bar in an activity
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    copied!<p>Is it possible to permanently remove the Navigation Bar on an activity? I want to remove the bar with the buttons that appear at the button of the screen on a tablet, not the Action Bar. <a href="http://developer.android.com/design/get-started/ui-overview.html" rel="noreferrer">Here</a>.</p> <p>I know it is not recommended to do that, I did not make this decision, but I need to do it. On my layout, there is another button to leave the activity. The rest of my app can have and does have the Navigation Bar.</p> <p>I found this code and adapted it a little bit. The problem is that even when I hide the Navigation Bar, there is a black space left behind. I guess the system calculates the screen size having into account the navigation bar?</p> <pre><code>public static class Content extends ImageView implements View.OnSystemUiVisibilityChangeListener, View.OnClickListener, ActionBar.OnMenuVisibilityListener { Activity mActivity; TextView mTitleView; Button mPlayButton; SeekBar mSeekView; boolean mAddedMenuListener; boolean mMenusOpen; boolean mPaused; boolean mNavVisible; int mLastSystemUiVis; Runnable mNavHider = new Runnable() { @Override public void run() { setNavVisibility(false); } }; public Content(Context context, AttributeSet attrs) { super(context, attrs); setOnSystemUiVisibilityChangeListener(this); setOnClickListener(this); } public void init(Activity activity, TextView title, Button playButton, SeekBar seek) { // This called by the containing activity to supply the surrounding // state of the video player that it will interact with. mActivity = activity; mTitleView = title; mPlayButton = playButton; mSeekView = seek; mPlayButton.setOnClickListener(this); setPlayPaused(true); } @Override protected void onAttachedToWindow() { super.onAttachedToWindow(); if (mActivity != null) { mAddedMenuListener = true; mActivity.getActionBar().addOnMenuVisibilityListener(this); } } @Override protected void onDetachedFromWindow() { super.onDetachedFromWindow(); if (mAddedMenuListener) { mActivity.getActionBar().removeOnMenuVisibilityListener(this); } } @Override public void onSystemUiVisibilityChange(int visibility) { // Detect when we go out of nav-hidden mode, to clear our state // back to having the full UI chrome up. Only do this when // the state is changing and nav is no longer hidden. int diff = mLastSystemUiVis ^ visibility; mLastSystemUiVis = visibility; if ((diff&amp;SYSTEM_UI_FLAG_HIDE_NAVIGATION) != 0 &amp;&amp; (visibility&amp;SYSTEM_UI_FLAG_HIDE_NAVIGATION) == 0) { setNavVisibility(true); } } @Override protected void onWindowVisibilityChanged(int visibility) { super.onWindowVisibilityChanged(visibility); // When we become visible or invisible, play is paused. setPlayPaused(true); } @Override public void onClick(View v) { if (v == mPlayButton) { // Clicking on the play/pause button toggles its state. setPlayPaused(!mPaused); } else { // Clicking elsewhere makes the navigation visible. setNavVisibility(true); } } @Override public void onMenuVisibilityChanged(boolean isVisible) { mMenusOpen = isVisible; setNavVisibility(true); } void setPlayPaused(boolean paused) { mPaused = paused; mPlayButton.setText(paused ? R.string.play : R.string.pause); setKeepScreenOn(!paused); setNavVisibility(true); } void setNavVisibility(boolean visible) { int newVis = SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN | SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION | SYSTEM_UI_FLAG_LAYOUT_STABLE; if (!visible) { newVis |= SYSTEM_UI_FLAG_LOW_PROFILE | SYSTEM_UI_FLAG_FULLSCREEN | SYSTEM_UI_FLAG_HIDE_NAVIGATION; } // If we are now visible, schedule a timer for us to go invisible. if (visible) { Handler h = getHandler(); if (h != null) { h.removeCallbacks(mNavHider); if (!mMenusOpen &amp;&amp; !mPaused) { // If the menus are open or play is paused, we will not auto-hide. h.postDelayed(mNavHider, 1500); } } } // Set the new desired visibility. setSystemUiVisibility(newVis); mTitleView.setVisibility(visible ? VISIBLE : INVISIBLE); mPlayButton.setVisibility(visible ? VISIBLE : INVISIBLE); mSeekView.setVisibility(visible ? VISIBLE : INVISIBLE); } } </code></pre>
 

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