1. 技术文章
  2. How to disable snackbar's swipe-to-dismiss behavior

How to disable snackbar's swipe-to-dismiss behavior

由 為{幸葍}努か 提交于 2019-11-26 20:43:35

问题


Is there a way to prevent the user from dismissing a snackbar by swiping on it?

I have an app that shows a snack bar during network login, I want to avoid it to be dismissed.

According to Nikola Despotoski suggestion I've experimented both solutions:

private void startSnack(){

    loadingSnack = Snackbar.make(findViewById(R.id.email_login_form), getString(R.string.logging_in), Snackbar.LENGTH_INDEFINITE)
            .setAction("CANCEL", new OnClickListener() {
                @Override
                public void onClick(View view) {
                    getOps().cancelLogin();
                    enableControls();
                }
            });

    loadingSnack.getView().setOnTouchListener(new View.OnTouchListener() {
        public long mInitialTime;
        @Override
        public boolean onTouch(View v, MotionEvent event) {
            if (v instanceof Button) return false; //Action view was touched, proceed normally.
            else {
                switch (MotionEventCompat.getActionMasked(event)) {
                    case MotionEvent.ACTION_DOWN: {
                        Log.i(TAG, "ACTION_DOWN");
                        mInitialTime = System.currentTimeMillis();
                        break;
                    }
                    case MotionEvent.ACTION_UP: {
                        Log.i(TAG, "ACTION_UP");
                        long clickDuration = System.currentTimeMillis() - mInitialTime;
                        if (clickDuration <= ViewConfiguration.getTapTimeout()) {
                            return false;// click event, proceed normally
                        }
                    }
                    case MotionEvent.ACTION_MOVE: {
                        Log.i(TAG, "ACTION_MOVE");
                        return true;
                    }
                }
                return true;
            }
        }
    });

    ViewGroup.LayoutParams lp = loadingSnack.getView().getLayoutParams();
    if (lp != null && lp instanceof CoordinatorLayout.LayoutParams) {
        ((CoordinatorLayout.LayoutParams)lp).setBehavior(new DummyBehavior());
        loadingSnack.getView().setLayoutParams(lp);
        Log.i(TAG, "Dummy behavior assigned to " + lp.toString());

    }

    loadingSnack.show();

}

this is DummyBehavior class:

public class DummyBehavior extends CoordinatorLayout.Behavior<View>{

    /**
     * Debugging tag used by the Android logger.
     */
    protected final static String TAG =
            DummyBehavior.class.getSimpleName();



    public DummyBehavior() {
        Log.i(TAG, "Dummy behavior created");
        StackTraceElement[] stackTrace = Thread.currentThread().getStackTrace();
        Log.i(TAG, "Method " + stackTrace[2].getMethodName() );

    }

    public DummyBehavior(Context context, AttributeSet attrs) {
        super(context, attrs);
        Log.i(TAG, "Dummy behavior created");

    }

    @Override
    public boolean onInterceptTouchEvent(CoordinatorLayout parent, View child, MotionEvent ev) {
        Log.i(TAG, "Method " + Thread.currentThread().getStackTrace()[2].getMethodName() );
        return false;
    }

    @Override
    public boolean onTouchEvent(CoordinatorLayout parent, View child, MotionEvent ev) {
        Log.i(TAG, "Method " + Thread.currentThread().getStackTrace()[2].getMethodName() );
        return false;
    }

    @Override
    public boolean blocksInteractionBelow(CoordinatorLayout parent, View child) {
        Log.i(TAG, "Method " + Thread.currentThread().getStackTrace()[2].getMethodName() );
        return false;
    }

    @Override
    public boolean layoutDependsOn(CoordinatorLayout parent, View child, View dependency) {
        Log.i(TAG, "Method " + Thread.currentThread().getStackTrace()[2].getMethodName() );
        return false;
    }

    @Override
    public boolean onDependentViewChanged(CoordinatorLayout parent, View child, View dependency) {
        Log.i(TAG, "Method " + Thread.currentThread().getStackTrace()[2].getMethodName() );
        return false;
    }

    @Override
    public void onDependentViewRemoved(CoordinatorLayout parent, View child, View dependency) {
        Log.i(TAG, "Method " + Thread.currentThread().getStackTrace()[2].getMethodName() );
    }

    @Override
    public boolean isDirty(CoordinatorLayout parent, View child) {
        Log.i(TAG, "Method " + Thread.currentThread().getStackTrace()[2].getMethodName() );
        return false;
    }

    @Override
    public boolean onMeasureChild(CoordinatorLayout parent, View child, int parentWidthMeasureSpec, int widthUsed, int parentHeightMeasureSpec, int heightUsed) {
        Log.i(TAG, "Method " + Thread.currentThread().getStackTrace()[2].getMethodName() );
        return false;
    }

    @Override
    public boolean onLayoutChild(CoordinatorLayout parent, View child, int layoutDirection) {
        Log.i(TAG, "Method " + Thread.currentThread().getStackTrace()[2].getMethodName() );
        return false;
    }

    @Override
    public boolean onStartNestedScroll(CoordinatorLayout coordinatorLayout, View child, View directTargetChild, View target, int nestedScrollAxes) {
        Log.i(TAG, "Method " + Thread.currentThread().getStackTrace()[2].getMethodName() );
        return false;
    }

    @Override
    public void onNestedScrollAccepted(CoordinatorLayout coordinatorLayout, View child, View directTargetChild, View target, int nestedScrollAxes) {
        Log.i(TAG, "Method " + Thread.currentThread().getStackTrace()[2].getMethodName() );
    }

    @Override
    public void onStopNestedScroll(CoordinatorLayout coordinatorLayout, View child, View target) {
        Log.i(TAG, "Method " + Thread.currentThread().getStackTrace()[2].getMethodName() );
    }

    @Override
    public void onNestedScroll(CoordinatorLayout coordinatorLayout, View child, View target, int dxConsumed, int dyConsumed, int dxUnconsumed, int dyUnconsumed) {
        Log.i(TAG, "Method " + Thread.currentThread().getStackTrace()[2].getMethodName() );
    }

    @Override
    public void onNestedPreScroll(CoordinatorLayout coordinatorLayout, View child, View target, int dx, int dy, int[] consumed) {
        Log.i(TAG, "Method " + Thread.currentThread().getStackTrace()[2].getMethodName() );
    }

    @Override
    public boolean onNestedFling(CoordinatorLayout coordinatorLayout, View child, View target, float velocityX, float velocityY, boolean consumed) {
        Log.i(TAG, "Method " + Thread.currentThread().getStackTrace()[2].getMethodName() );
        return false;
    }

    @Override
    public boolean onNestedPreFling(CoordinatorLayout coordinatorLayout, View child, View target, float velocityX, float velocityY) {
        Log.i(TAG, "Method " + Thread.currentThread().getStackTrace()[2].getMethodName() );
        return false;
    }

    @Override
    public WindowInsetsCompat onApplyWindowInsets(CoordinatorLayout coordinatorLayout, View child, WindowInsetsCompat insets) {
        Log.i(TAG, "Method " + Thread.currentThread().getStackTrace()[2].getMethodName() );
        return null;
    }

    @Override
    public void onRestoreInstanceState(CoordinatorLayout parent, View child, Parcelable state) {
        Log.i(TAG, "Method " + Thread.currentThread().getStackTrace()[2].getMethodName() );
    }

    @Override
    public Parcelable onSaveInstanceState(CoordinatorLayout parent, View child) {
        Log.i(TAG, "Method " + Thread.currentThread().getStackTrace()[2].getMethodName() );
        return null;
    }
}

But my snackbar still disappears when swiped and this is a typical log:

12-02 22:26:43.864 19598-19598/ I/DummyBehavior: Dummy behavior created
12-02 22:26:43.866 19598-19598/ I/DummyBehavior: Method <init>
12-02 22:26:43.866 19598-19598/ I/LifecycleLoggingActivity: Dummy behavior assigned to android.support.design.widget.CoordinatorLayout$LayoutParams@808c0e9
12-02 22:26:44.755 19598-19598/ I/LifecycleLoggingActivity: ACTION_DOWN
12-02 22:26:44.798 19598-19598/ I/LifecycleLoggingActivity: ACTION_MOVE
12-02 22:26:44.815 19598-19598/ I/LifecycleLoggingActivity: ACTION_MOVE
12-02 22:26:44.832 19598-19598/ I/LifecycleLoggingActivity: ACTION_MOVE
12-02 22:26:44.849 19598-19598/ I/LifecycleLoggingActivity: ACTION_MOVE
12-02 22:26:44.866 19598-19598/ I/LifecycleLoggingActivity: ACTION_MOVE
12-02 22:26:44.883 19598-19598/ I/LifecycleLoggingActivity: ACTION_MOVE

回答1:


This worked for me:

    Snackbar.SnackbarLayout layout = (Snackbar.SnackbarLayout) snackbar.getView();
    snackbar.setDuration(Snackbar.LENGTH_INDEFINITE);
    snackbar.show();
    layout.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
        @Override
        public void onGlobalLayout() {
            ViewGroup.LayoutParams lp = layout.getLayoutParams();
            if (lp instanceof CoordinatorLayout.LayoutParams) {
                ((CoordinatorLayout.LayoutParams) lp).setBehavior(new DisableSwipeBehavior());
                layout.setLayoutParams(lp);
            }
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
                layout.getViewTreeObserver().removeOnGlobalLayoutListener(this);
            } else {
                //noinspection deprecation
                layout.getViewTreeObserver().removeGlobalOnLayoutListener(this);
            }
        }
    });

Where DisableSwipeBehavior is:

public class DisableSwipeBehavior extends SwipeDismissBehavior<Snackbar.SnackbarLayout> {
    @Override
    public boolean canSwipeDismissView(@NonNull View view) {
        return false;
    }
}



回答2:


Snackbar now has actual support for this by using the setBehavior method. The great thing here is that before you would always lose some behaviors which are now preserved.

Note that the package moved so you have to import the "new" Snackbar in the snackbar package.

Snackbar.make(view, stringId, Snackbar.LENGTH_LONG)
    .setBehavior(new NoSwipeBehavior())
    .show();

class NoSwipeBehavior extends BaseTransientBottomBar.Behavior {

    @Override
    public boolean canSwipeDismissView(View child) {
      return false;
    }
}



回答3:


This worked for me :

Snackbar snackbar = Snackbar.make(findViewById(container), R.string.offers_refreshed, Snackbar.LENGTH_LONG);
    final View snackbarView = snackbar.getView();
    snackbar.show();

    snackbarView.getViewTreeObserver().addOnPreDrawListener(new ViewTreeObserver.OnPreDrawListener() {
        @Override
        public boolean onPreDraw() {
            snackbarView.getViewTreeObserver().removeOnPreDrawListener(this);
            ((CoordinatorLayout.LayoutParams) snackbarView.getLayoutParams()).setBehavior(null);
            return true;
        }
    });

Good luck! :)




回答4:


You can disable streaming touch events rather than clicks to the Snackbar view. 

mSnackBar.getView().setOnTouchListener(new View.OnTouchListener() {
            public long mInitialTime;
            @Override
            public boolean onTouch(View v, MotionEvent event) {
                if (v instanceof Button) return false; //Action view was touched, proceed normally.
                else {
                    switch (MotionEventCompat.getActionMasked(event)) {
                        case MotionEvent.ACTION_DOWN: {
                            mInitialTime = System.currentTimeMillis();
                            break;
                        }
                        case MotionEvent.ACTION_UP: {
                            long clickDuration = System.currentTimeMillis() - mInitialTime;
                            if (clickDuration <= ViewConfiguration.getTapTimeout()) {
                                return false;// click event, proceed normally
                            }
                        }
                    }
                    return true;
                }
            });

Or you could just replace the Snackbar behavior with some empty CoordinatorLayout.Behavior:

public CouchPotatoBehavior extends CoordinatorLayout.Behavior<View>{

    //override all methods and don't call super methods. 

}

This is the empty behavior, that does nothing. Default SwipeToDismissBehavior uses ViewDragHelper to process touch events, upon which triggers the dismissal. 

 ViewGroup.LayoutParams lp = mSnackbar.getView().getLayoutParams();
 if (lp instanceof CoordinatorLayout.LayoutParams) {
     ((CoordinatorLayout.LayoutParams)lp).setBehavior(new CouchPotatoBehavior());
       mSnackbar.getView().setLayoutParams(lp);              
}



回答5:


Better solution here.... Don't provide CoordinatorLayout or any of its child as view in snackbar.

Snackbar.make(ROOT_LAYOUT , "No internet connection", Snackbar.LENGTH_INDEFINITE).show();

Where, the ROOT_LAYOUT should be any layout except coordinatorlayout or its child.




回答6:


Here is a solution that does not require you to mess with ViewTreeObserver. Note that the following solution is written in Kotlin based on SDK 26.

BaseTransientBottomBar

final void showView() {
    if (mView.getParent() == null) {
        final ViewGroup.LayoutParams lp = mView.getLayoutParams();

        if (lp instanceof CoordinatorLayout.LayoutParams) {
            // If our LayoutParams are from a CoordinatorLayout, we'll setup our Behavior
            final CoordinatorLayout.LayoutParams clp = (CoordinatorLayout.LayoutParams) lp;

            final Behavior behavior = new Behavior();
            behavior.setStartAlphaSwipeDistance(0.1f);
            behavior.setEndAlphaSwipeDistance(0.6f);
            behavior.setSwipeDirection(SwipeDismissBehavior.SWIPE_DIRECTION_START_TO_END);
            behavior.setListener(new SwipeDismissBehavior.OnDismissListener() {
                @Override
                public void onDismiss(View view) {
                    view.setVisibility(View.GONE);
                    dispatchDismiss(BaseCallback.DISMISS_EVENT_SWIPE);
                }

                @Override
                public void onDragStateChanged(int state) {
                    switch (state) {
                        case SwipeDismissBehavior.STATE_DRAGGING:
                        case SwipeDismissBehavior.STATE_SETTLING:
                            // If the view is being dragged or settling, pause the timeout
                            SnackbarManager.getInstance().pauseTimeout(mManagerCallback);
                            break;
                        case SwipeDismissBehavior.STATE_IDLE:
                            // If the view has been released and is idle, restore the timeout
                            SnackbarManager.getInstance()
                                    .restoreTimeoutIfPaused(mManagerCallback);
                            break;
                    }
                }
            });
            clp.setBehavior(behavior);
            // Also set the inset edge so that views can dodge the bar correctly
            clp.insetEdge = Gravity.BOTTOM;
        }

        mTargetParent.addView(mView);
    }

    ...
}

If you look in to the source code of BaseTransientBottomBar in method showView, it add the behavior if the layoutParams is CoordinatorLayout.LayoutParams. We can undo this by setting the behavior back to null.

As it add the behavior just before the view is shown, we should undo it after the view is shown.

val snackbar = Snackbar.make(coordinatorLayout, "Hello World!", Snackbar.LENGTH_INDEFINITE)
snackbar.show()
snackbar.addCallback(object : BaseTransientBottomBar.BaseCallback<Snackbar>() {
    override fun onShown(transientBottomBar: Snackbar) {
        val layoutParams = transientBottomBar.view.layoutParams as? CoordinatorLayout.LayoutParams
        layoutParams?.let { it.behavior = null }
    }
})


来源：https://stackoverflow.com/questions/34031476/how-to-disable-snackbars-swipe-to-dismiss-behavior

标签
android
swipe
dismiss
android-snackbar
snackbar
易学教程内所有资源均来自网络或用户发布的内容，如有违反法律规定的内容欢迎反馈！
该文章没有解决你所遇到的问题?点击提问,说说你的问题,让更多的人一起探讨吧!