[안드로이드 학습] 안드로이드 4.4 침몰 모드의 진입 및 종료 시 시스템 표시줄 상태 표시줄에 문제를 숨깁니다

<pre name="code" class="java">Rect frame = new Rect();
topView.getWindowVisibleDisplayFrame(frame) ;
int height = frame.top;

 
  
 
heightの值为0，因此画面还是因为没有计算系统栏的高度被遮盖了一半。
 
 
该height=0应该是此时还没被UI线程更新和赋值。
 
 
解决方法是将获取系统栏和状态栏的高度放在一个UI线程的handler里面去排队执行。
 
 
public class MainActivity extends Activity implements OnClickListener{

    LinearLayout rl;
    View topView;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        ActionBar actionBar = getActionBar();
        actionBar.setDisplayHomeAsUpEnabled(true);
        actionBar.setHomeButtonEnabled(true);
        
        // activity_main ID
        rl = (LinearLayout)findViewById(R.id.rl);
        
        topView = getWindow().getDecorView();
        rl.setPadding(0, 0, 0, 0);
        Button btOn = (Button) findViewById(R.id.on);
        btOn.setOnClickListener(this);
        
        Button btOff = (Button) findViewById(R.id.off);
        btOff.setOnClickListener(this);
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // TODO Auto-generated method stub
        switch(item.getItemId()){
        case android.R.id.home:
            finish();
            break;
        }
        
        return super.onOptionsItemSelected(item);
    }

    @Override
    public void onClick(View v) {
        // TODO Auto-generated method stub

        switch (v.getId()) {
        case R.id.on:
            hideSystemUI(topView);
            rl.setPadding(0, 0, 0, 0);
            break;
        case R.id.off:
            showSystemUI(topView);
            topView.postInvalidate();
            //   UI   handler    
            Message msg = new Message();
            msg.what = 1;
            this.validateHandler.sendMessage(msg);
            
            break;
        default:
            break;
        }
        
    }
    
     private Handler validateHandler = new  Handler() {  
        
            @Override  
            public void handleMessage(Message msg)  {  
                switch (msg.what)  
                {  
                case 1:  
                    Rect frame = new Rect();
                    topView.getWindowVisibleDisplayFrame(frame);
                    int paddingTop = getActionBar().getHeight()+ frame.top;
                    rl.setPadding(0, paddingTop, 0, 0);
                    break;  
                }  
                super.handleMessage(msg);  
            }  
        };  

      public static void hideSystemUI(View view) {
                view.setSystemUiVisibility(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);
     }
           
       @SuppressLint("NewApi")
       public static void showSystemUI(View view) {
           view.setSystemUiVisibility(
                   View.SYSTEM_UI_FLAG_LAYOUT_STABLE
                   | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
                   | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN);
       }
       

       @Override
       public boolean onCreateOptionsMenu(Menu menu) {
           // Inflate the menu; this adds items to the action bar if it is present.
           getMenuInflater().inflate(R.menu.main, menu);
           return true;
       }
}
  
이 블로거가 나중에 대답했다. 사실 반사 방법을 통해 시스템에서 actionbar와 Statusbar의 높이를 직접 꺼낼 수 있는 것도 좋은 방법이다. 여기서 인용해 보자.
    //          
public static int getStatusBarHeight(Context context) {
    Class<?> c = null;
    Object obj = null;
    Field field = null;
    int x = 0, statusBarHeight = 0;
    try {
        c = Class.forName("com.android.internal.R$dimen");
        obj = c.newInstance();
        field = c.getField("status_bar_height");
        x = Integer.parseInt(field.get(obj).toString());
        statusBarHeight = context.getResources().getDimensionPixelSize(x);
    } catch (Exception e) {
        e.printStackTrace();
    }
    return statusBarHeight;
}
 
//   ActionBar   
public static int getActionBarHeight(Context context) {
    TypedValue tv = new TypedValue();
    int actionBarHeight = 0;
    if (context.getTheme().resolveAttribute(android.R.attr.actionBarSize, tv, true))
    {
        actionBarHeight = TypedValue.complexToDimensionPixelSize(tv.data, context.getResources().getDisplayMetrics());
    }
    return actionBarHeight;
}