全屏的Activity

import android.annotation.SuppressLint;
import android.app.Activity;
import android.app.AlertDialog;
import android.os.Bundle;
import android.os.Handler;
import android.view.GestureDetector;
import android.view.MotionEvent;
import android.view.View;

/**
 * @author Dawid Drozd
 *         

 *         Please check before adding this fragment simply call
 *         isFragmentAvailable.
 *         

 *         You must manually call onKeyDown and onWindowFocusChanged.
 */
public abstract class FullScreenActivity extends Activity implements Runnable {

    //全屏使用的flag
    private static final int UI_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;
    GestureDetector mGesture = null;


    @SuppressLint("NewApi")
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        mGesture = new GestureDetector(this, new GestureListener());
        final View decorView = getWindow().getDecorView();
        decorView.setOnSystemUiVisibilityChangeListener
                (new View.OnSystemUiVisibilityChangeListener() {
                    @Override
                    public void onSystemUiVisibilityChange(int visibility) {
//                        System.out.println("=====onSystemUiVisibilityChange=======");

                        if ((visibility & View.SYSTEM_UI_FLAG_FULLSCREEN) == 0) {
                            setImmersiveMode();
//                            System.out.println("system bars are visible");

                        }
                    }
                });

    }




    @Override
    public boolean dispatchTouchEvent(MotionEvent ev) {
        mGesture.onTouchEvent(ev);
        return super.dispatchTouchEvent(ev);
    }

    @Override
    protected void onResume() {
        super.onResume();
        setImmersiveMode();
    }

    @Override
    public void onWindowFocusChanged(boolean hasFocus) {
//        System.out.println("onWindowFocusChanged");

        setImmersiveMode();
        _handler.removeCallbacks(this);
        _handler.postDelayed(this, 20);
    }


    @Override
    public void onStop() {
        _handler.removeCallbacks(this);
        super.onStop();
    }

    @Override
    public void run() {
        setImmersiveMode();
    }

    @SuppressLint("NewApi")
    public void setImmersiveMode() {
        setImmersiveMode(this);
    }


    @SuppressLint("NewApi")
    public void setImmersiveMode(Activity activity) {
//        System.out.println("===============setImmersiveMode===============");
        activity.getWindow().getDecorView().setSystemUiVisibility(UI_FLAGS);

    }

    private Handler _handler = new Handler() ;

    private void addView() {
//        System.out.println("============addView ============");

        AlertDialog builder = new AlertDialog.Builder(this).create();
        builder.setTitle("测试");
        builder.show();
        builder.dismiss();

    }

    class GestureListener extends GestureDetector.SimpleOnGestureListener {
        @Override
        public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
            //判断导航栏是否弹出，这是在横屏情况下
            System.out.println("========onFling========");
            if (e1.getY() > e2.getY() && e1.getY() > 1480) {//从下往上滑
                addView();
            } else if (e1.getY() < e2.getY() && e1.getY() < 70) {  //从上往下滑
                addView();
            }
            return super.onFling(e1, e2, velocityX, velocityY);
        }
    }





    @Override
    protected void onDestroy() {
        super.onDestroy();

    }
}