Question

我有一个全屏活动，片段显示3个TextView，用户可以滑动。问题在于操作栏，在模拟器上它工作正常，当单击活动时它显示系统UI但在使用设备时系统UI在点击时不显示。

通过使用SWIPE_MIN_DISTANCE进行调整我注意到根本没有使用onFling方法，当我第一次只编码它默认使用的片段时，但是在点击或点击时仍然没有显示系统UI。所以我想通过实现onFling方法，我可以用滑动来缓和。

以下是代码。

public class FullscreenActivity extends FragmentActivity implements OnGestureListener {

 private static final int SWIPE_MIN_DISTANCE = 120;
 private static final int SWIPE_MAX_OFF_PATH = 250;
 private static final int SWIPE_THRESHOLD_VELOCITY = 200;
private static final boolean AUTO_HIDE = true;
private static final int AUTO_HIDE_DELAY_MILLIS = 3000;
private static final boolean TOGGLE_ON_CLICK = true;
private static final int HIDER_FLAGS = SystemUiHider.FLAG_HIDE_NAVIGATION;
private SystemUiHider mSystemUiHider;
SectionsPagerAdapter mSectionsPagerAdapter;
ViewPager mViewPager;


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);


    setContentView(R.layout.activity_fullscreen);

    final View controlsView = findViewById(R.id.fullscreen_content_controls);
    final View contentView = findViewById(R.id.pager);


    mSectionsPagerAdapter = new SectionsPagerAdapter(
            getSupportFragmentManager());

    mViewPager = (ViewPager) findViewById(R.id.pager);
    mViewPager.setAdapter(mSectionsPagerAdapter);
    // Set up an instance of SystemUiHider to control the system UI for
    // this activity.
    mSystemUiHider = SystemUiHider.getInstance(this, contentView,
            HIDER_FLAGS);
    mSystemUiHider.setup();
    mSystemUiHider
            .setOnVisibilityChangeListener(new SystemUiHider.OnVisibilityChangeListener() {
                // Cached values.
                int mControlsHeight;
                int mShortAnimTime;

                @Override
                @TargetApi(Build.VERSION_CODES.HONEYCOMB_MR2)
                public void onVisibilityChange(boolean visible) {
                    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB_MR2) {
                        // If the ViewPropertyAnimator API is available
                        // (Honeycomb MR2 and later), use it to animate the
                        // in-layout UI controls at the bottom of the
                        // screen.
                        if (mControlsHeight == 0) {
                            mControlsHeight = controlsView.getHeight();
                        }
                        if (mShortAnimTime == 0) {
                            mShortAnimTime = getResources().getInteger(
                                    android.R.integer.config_shortAnimTime);
                        }
                        controlsView
                                .animate()
                                .translationY(visible ? 0 : mControlsHeight)
                                .setDuration(mShortAnimTime);
                    } else {
                        // If the ViewPropertyAnimator APIs aren't
                        // available, simply show or hide the in-layout UI
                        // controls.
                        controlsView.setVisibility(visible ? View.VISIBLE
                                : View.GONE);
                    }

                    if (visible && AUTO_HIDE) {
                        // Schedule a hide().
                        delayedHide(AUTO_HIDE_DELAY_MILLIS);
                    }
                }
            });

    // Set up the user interaction to manually show or hide the system UI.
    contentView.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            if (TOGGLE_ON_CLICK) {
                mSystemUiHider.toggle();
            } else {
                mSystemUiHider.show();
            }
        }
    });




    // Upon interacting with UI controls, delay any scheduled hide()
    // operations to prevent the jarring behavior of controls going away
    // while interacting with the UI.
    findViewById(R.id.dummy_button).setOnTouchListener(
            mDelayHideTouchListener);
}



public class SectionsPagerAdapter extends FragmentPagerAdapter {

    public SectionsPagerAdapter(FragmentManager fm) {
        super(fm);
    }

    @Override
    public Fragment getItem(int position) {
        Fragment fragment = new DummySectionFragment();
        Bundle args = new Bundle();
        args.putInt(DummySectionFragment.ARG_SECTION_NUMBER, position);
        fragment.setArguments(args);
        return fragment;
    }

    @Override
    public int getCount() {
        return 3;
    }


}


public static class DummySectionFragment extends Fragment {
    public static final String ARG_SECTION_NUMBER = "section_number";

    public DummySectionFragment() {
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {

        TextView textView = new TextView(getActivity());

        textView.setGravity(Gravity.LEFT);

        textView.setText(Integer.toString(getArguments().getInt(
                ARG_SECTION_NUMBER)));
        return textView;
    }
}








@Override
protected void onPostCreate(Bundle savedInstanceState) {
    super.onPostCreate(savedInstanceState);

    // Trigger the initial hide() shortly after the activity has been
    // created, to briefly hint to the user that UI controls
    // are available.
    delayedHide(100);
}


View.OnTouchListener mDelayHideTouchListener = new View.OnTouchListener() {
    @Override
    public boolean onTouch(View view, MotionEvent motionEvent) {
        if (AUTO_HIDE) {
            delayedHide(AUTO_HIDE_DELAY_MILLIS);
        }
        return false;
    }
};

Handler mHideHandler = new Handler();
Runnable mHideRunnable = new Runnable() {
    @Override
    public void run() {
        mSystemUiHider.hide();
    }
};

private void delayedHide(int delayMillis) {
    mHideHandler.removeCallbacks(mHideRunnable);
    mHideHandler.postDelayed(mHideRunnable, delayMillis);
}


 @Override
 public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY)
 {
 try {
 if (Math.abs(e1.getY() - e2.getY()) > SWIPE_MAX_OFF_PATH)
 return false;
 // right to left swipe
 if(e1.getX() - e2.getX() > SWIPE_MIN_DISTANCE && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
 Toast.makeText(getApplicationContext(), "Left Swipe", Toast.LENGTH_SHORT).show();
 } else if (e2.getX() - e1.getX() > SWIPE_MIN_DISTANCE && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
 Toast.makeText(getApplicationContext(), "Right Swipe", Toast.LENGTH_SHORT).show();
 }
 else if(e1.getY() - e2.getY() > SWIPE_MIN_DISTANCE && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
 Toast.makeText(getApplicationContext(), "Swipe up", Toast.LENGTH_SHORT).show();
 } else if (e2.getY() - e1.getY() > SWIPE_MIN_DISTANCE && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
 Toast.makeText(getApplicationContext(), "Swipe down", Toast.LENGTH_SHORT).show();
 }
 } catch (Exception e) {
 // nothing
 }

 return true;
 }


@Override
public boolean onDown(MotionEvent arg0) {
    // TODO Auto-generated method stub
    return false;
}


@Override
public void onLongPress(MotionEvent e) {
    // TODO Auto-generated method stub

}


@Override
public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX,
        float distanceY) {
    // TODO Auto-generated method stub
    return false;
}


@Override
public void onShowPress(MotionEvent e) {
    // TODO Auto-generated method stub

}


@Override
public boolean onSingleTapUp(MotionEvent e) {
    // TODO Auto-generated method stub
    return false;
}

Answer 1

尝试以下方式，在你的onCreate（）方法中添加以下行，

 this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);

上述行必须在super.onCreate(savedInstanceState);行

之后

如下所示，

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
    ...
}

在全屏活动中具有片段活动

1 个答案: