Perference详解

(1)Preference是什么?

Represents the basic Preference UI building block displayed by a PreferenceActivity in the form of a ListView.

(2)它能干什么?

This class provides the View to be displayed in the activity and associates with a SharedPreferences to store/retrieve the preference data.

(3)怎么做的?

When specifying a preference hierarchy in XML, each element can point to a subclass of Preference, similar to the view hierarchy and layouts.

This class contains a key that will be used as the key into the SharedPreferences. It is up to the subclass to decide how to store the value.

 

下面我们对它进行分析:

 

 

 /**

     * Gets the View that will be shown in the {@link PreferenceActivity}.

     * 

     * @param convertView The old View to reuse, if possible. Note: You should

     *            check that this View is non-null and of an appropriate type

     *            before using. If it is not possible to convert this View to

     *            display the correct data, this method can create a new View.

     * @param parent The parent that this View will eventually be attached to.

     * @return Returns the same Preference object, for chaining multiple calls

     *         into a single statement.

     * @see #onCreateView(ViewGroup)

     * @see #onBindView(View)

     */

    public View getView(View convertView, ViewGroup parent) {

        if (convertView == null) {

            convertView = onCreateView(parent);

        }

        onBindView(convertView);

        return convertView;

    }

 

 

 

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