Lollipop永久隐藏导航栏和控件

Question

1. 我正在使用以下代码实现Kiosk模式，并在我第一次运行我的应用时将其设置为默认值

   public class KioskActivity extends Activity {
   
   final int flags = View.SYSTEM_UI_FLAG_LAYOUT_STABLE
           | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
           | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
           | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
           | View.SYSTEM_UI_FLAG_FULLSCREEN
           | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY;
   
   @Override
   protected void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
   
       getWindow().getDecorView().setSystemUiVisibility(flags);
   
       getActionBar().hide();
   
       setContentView(wenchao.kiosk.R.layout.activity_lock_activity);
       DevicePolicyManager myDevicePolicyManager = (DevicePolicyManager) getSystemService(Context.DEVICE_POLICY_SERVICE);
       ComponentName mDPM = new ComponentName(this, MyAdmin.class);
       if (myDevicePolicyManager.isDeviceOwnerApp(this.getPackageName())) {
           String[] packages = {this.getPackageName()};
           startLockTask();
       } else {
           Toast.makeText(getApplicationContext(),"Not owner", Toast.LENGTH_LONG).show();
       }
   
       setVolumMax();
   
       Button lock_btn = (Button)findViewById(wenchao.kiosk.R.id.lock_button);
       Button unlock_btn = (Button)findViewById(wenchao.kiosk.R.id.unlock_button);
       Button appButton = (Button) findViewById(R.id.appButton);
   
       lock_btn.setOnTouchListener(new View.OnTouchListener() {
           @Override
           public boolean onTouch(View v, MotionEvent event) {
               startLockTask();
               return false;
           }
       });
   
       unlock_btn.setOnTouchListener(new View.OnTouchListener() {
           @Override
           public boolean onTouch(View v, MotionEvent event) {
               stopLockTask();
               return false;
           }
       });
   
       appButton.setOnClickListener(new View.OnClickListener() {
           @Override
           public void onClick(View view) {
                ......
           }
       });
   }
   
   @Override
   public boolean onKeyDown(int keyCode, KeyEvent event){
   
       if (keyCode == KeyEvent.KEYCODE_VOLUME_UP){
           Toast.makeText(this, "Volume button is disabled", Toast.LENGTH_SHORT).show();
           return true;
       }
   
       if (keyCode == KeyEvent.KEYCODE_VOLUME_DOWN){
           Toast.makeText(this, "Volume button is disabled", Toast.LENGTH_SHORT).show();
           return true;
       }
   
       return super.onKeyDown(keyCode, event);
   }
   
   private void setVolumMax(){
       AudioManager am = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
       am.setStreamVolume(
               AudioManager.STREAM_SYSTEM,
               am.getStreamMaxVolume(AudioManager.STREAM_SYSTEM),
               0);
   }
   }
   

   

   它看起来对我很完美，我以为我达到了我想要的效果。

2. 这是痛点，当我从顶部向下滑动，获得带控件的透明栏时，我没有假设：

   

   实际上它会持续几秒然后消失（但我不希望它出现在我的应用程序中，即使是毫秒）

3. 当我转移到其他应用程序时，使用点击应用程序按钮，然后回到我的应用程序，得到它，它很烦人：

   

   每当它出现时永远不会消失，除了关闭应用程序之外别无选择，以摆脱

   值＆gt; styles.xml：

   <resources>
   
       <!-- Base application theme. -->
       <style name="AppTheme" parent="android:Theme.Holo.Light.DarkActionBar">
           <!-- Customize your theme here. -->
       </style>
   
   </resources>
   

   values-v21＆gt; styles.xml：

   <?xml version="1.0" encoding="utf-8"?>
   <resources>
       <style name="AppTheme" parent="android:Theme.Material.Light">
       </style>
   </resources>