问Android在Tap上显示自定义Nav和页脚(如ImageViewer )

EN

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/rlMain"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="#f2af2a" >

</RelativeLayout>

public class MainActivity extends Activity {
    Handler mHandler = new Handler();
    RelativeLayout rlMain;
    Runnable mRunnable = new Runnable() {

        @SuppressLint("NewApi")
        @Override
        public void run() {
            if (android.os.Build.VERSION.SDK_INT > android.os.Build.VERSION_CODES.HONEYCOMB)
                getWindow().getDecorView().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);
        }
    };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        rlMain = (RelativeLayout) findViewById(R.id.rlMain);

        mHandler.postDelayed(mRunnable, 1500);

        rlMain.setOnClickListener(new View.OnClickListener() {

            @SuppressLint("NewApi")
            @Override
            public void onClick(View arg0) {
                if (android.os.Build.VERSION.SDK_INT > android.os.Build.VERSION_CODES.HONEYCOMB) {
                    if (!(getWindow().getDecorView().getSystemUiVisibility() == View.SYSTEM_UI_FLAG_VISIBLE)) {
                        getWindow().getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_VISIBLE);
                    } else {
                        getWindow().getDecorView().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);
                    }
                }
                mHandler.removeCallbacks(mRunnable);
                mHandler.postDelayed(mRunnable, 3500);
            }
        });
    }
}