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public static interface PreferenceFragmentCompat.OnPreferenceStartScreenCallback

android.support.v7.preference.PreferenceFragmentCompat.OnPreferenceStartScreenCallback

PreferenceFragment包含的活动应该实现的接口，以便能够处理希望切换到首选项新屏幕的首选项。

Public methods
`abstract boolean`	`onPreferenceStartScreen(PreferenceFragmentCompat caller, PreferenceScreen pref)` 当用户点击PreferenceScreen项目以便导航到首选项的新屏幕时调用。

boolean onPreferenceStartScreen (PreferenceFragmentCompat caller, 
                PreferenceScreen pref)

当用户点击PreferenceScreen项目以便导航到首选项的新屏幕时调用。

Parameters
`caller`	`PreferenceFragmentCompat`: The fragment requesting navigation.
`pref`	`PreferenceScreen`: The preference screen to navigate to.

Returns
`boolean`	true if the screen navigation has been handled