How to prevent closing Navigation drawer by touch outside the drawer

问题

I have an Activity with Navigation Drawer. if user device is table and orientation is landscape - I not need to close drawer by click on item in drawer:

if (!isTablet || context.getResources().getConfiguration().orientation==1) {
    mDrawerLayout.closeDrawer(Gravity.START);
}

It work. But if user touch the screen outside opened drawer - drawer closing. Using DrawerLayout.LOCK_MODE_LOCKED_OPEN is unsuitable bacause I need to save drawer sliding functions. How to prevent closing Navigation drawer when user touch outside the drawer?

Please, help.

回答1:

Based on the other answer which I wrote here. I have modified the code to suit your question. Please check.

Check more about touch hierarchy here

dispatchTouchEvent() method should be overridden in Activity class

@Override    
public boolean dispatchTouchEvent(MotionEvent event) {
    if (event.getAction() == MotionEvent.ACTION_UP) {
        if (isDrawerOpen()) { //Your code here to check whether drawer is open or not. 

            View content = findViewById(R.id.drawer); //drawer view id
            int[] contentLocation = new int[2];
            content.getLocationOnScreen(contentLocation);
            Rect rect = new Rect(contentLocation[0],
                contentLocation[1],
                contentLocation[0] + content.getWidth(),
                contentLocation[1] + content.getHeight());

            if (!(rect.contains((int) event.getX(), (int) event.getY()))) {
                isOutSideClicked = true;
            } else {
                isOutSideClicked = false;
            }

        } else {
            return super.dispatchTouchEvent(event);
        }
    } else if (event.getAction() == MotionEvent.ACTION_DOWN && isOutSideClicked) {
        isOutSideClicked = false;
        return super.dispatchTouchEvent(event);
    } else if (event.getAction() == MotionEvent.ACTION_MOVE && isOutSideClicked) {
        return super.dispatchTouchEvent(event);
    }

    if (isOutSideClicked) {
        return true; //restrict the touch event here
    }else{
        return super.dispatchTouchEvent(event);
    }
}

Note: As mentioned in the question comments, this is against of Android guidelines. So try to avoid it until unless it is mandatory.

回答2:

Simplified version of Noundla's answer which works for me. I wrote my custom Drawer which extends DrawerLayout and implement dispatchTouchEvent() method.

@Override
public boolean dispatchTouchEvent(MotionEvent event) {
    if (!this.isDrawerOpen(Gravity.LEFT)) {
        return super.dispatchTouchEvent(event);
    }
    boolean isOutSideClicked = false;
    if (event.getAction() == MotionEvent.ACTION_UP) {
        View content = findViewById(R.id.drawer_view); 
        int[] contentLocation = new int[2];
        content.getLocationOnScreen(contentLocation);
        Rect rect = new Rect(contentLocation[0],
                contentLocation[1],
                contentLocation[0] + content.getWidth(),
                contentLocation[1] + content.getHeight());
        isOutSideClicked = !(rect.contains((int) event.getX(), (int) event.getY()));
    }
    this.setDrawerLockMode(isOutSideClicked ? DrawerLayout.LOCK_MODE_LOCKED_OPEN : DrawerLayout.LOCK_MODE_UNLOCKED);
    return super.dispatchTouchEvent(event);
}

Also if you want to keep interact with main content fragment while drawer is open you should add this line at the beginning of the method.

getChildAt(0).dispatchTouchEvent(event);

回答3:

it very simple use your drawer instance to prevent

1. implement DrawerLayout.DrawerListener

2. add this single statement inside this method us

 @Override
public void onDrawerOpened(View drawerView) {
    drawer.setDrawerLockMode(DrawerLayout.LOCK_MODE_LOCKED_OPEN);//DrawerLayout instance
}

来源：https://stackoverflow.com/questions/28626218/how-to-prevent-closing-navigation-drawer-by-touch-outside-the-drawer

标签

android

touch

navigation-drawer