android - registerForContextMenu 和 setOnCreateContextMenuListener 的区别？

Question

registerForContextMenu 有什么区别:

Registers a context menu to be shown for the given view (multiple views can show the context menu). This method will set the View.OnCreateContextMenuListener on the view to this activity

Call registerForContextMenu() and pass it the View you want to give a context menu. When this View then receives a long-press, it displays a context menu.

和 setOnCreateContextMenuListener :

Register a callback to be invoked when the context menu for this view is being built. If this view is not long clickable, it becomes long clickable.

用哪个？关于可点击的长内容:两者都在做同样的事情......

谢谢

Answer 1

如有疑问...请查看 Android 源代码!毕竟它是开源的。 :)

git://android.git.kernel.org/platform/frameworks/base.git/core/java/android/view/View.java:

/**
 * Register a callback to be invoked when the context menu for this view is
 * being built. If this view is not long clickable, it becomes long clickable.
 *
 * @param l The callback that will run
 *
 */
public void setOnCreateContextMenuListener(OnCreateContextMenuListener l) {
    if (!isLongClickable()) {
        setLongClickable(true);
    }
    mOnCreateContextMenuListener = l;
}

git://android.git.kernel.org/platform/frameworks/base.git/core/java/android/app/Activity.java:

/**
 * Registers a context menu to be shown for the given view (multiple views
 * can show the context menu). This method will set the
 * {@link OnCreateContextMenuListener} on the view to this activity, so
 * {@link #onCreateContextMenu(ContextMenu, View, ContextMenuInfo)} will be
 * called when it is time to show the context menu.
 *
 * @see #unregisterForContextMenu(View)
 * @param view The view that should show a context menu.
 */
public void registerForContextMenu(View view) {
    view.setOnCreateContextMenuListener(this);
}

所以，答案是它们是一样的。 registerForContextMenu() 除了调用 setOnCreateContextMenuListener() 什么都不做。