Android获取LayoutInflater对象的步骤总结

Android获取LayoutInflater对象的方法总结

在写Android程序时，有时候会编写自定义的View，使用Inflater对象来将布局文件解析成一个View。本文主要目的是总结获取LayoutInflater对象的方法。

1、若能获取context对象，可以有以下几种方法：

LayoutInflater inflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);View child = inflater.inflate(R.layout.child, null);

or

LayoutInflater inflater = LayoutInflater.from(context);View child = inflater.inflate(R.layout.child, null);

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2、在一个Activity中，可以有以下方法：

View child = getLayoutInflater().inflate(R.layout.child, item, false);

or

View view; LayoutInflater inflater = (LayoutInflater)   getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE); view = inflater.inflate(R.layout.mylayout, null);

方法1和方法2其实都是对context().getSystemService()的使用

3、使用View的静态方法：

View view=View.inflate(context, R.layout.child, null)

inflate实现源码如下：

    /**     * Inflate a view from an XML resource.  This convenience method wraps the [email protected]     * LayoutInflater} class, which provides a full range of options for view inflation.     *     * @param context The Context object for your activity or application.     * @param resource The resource ID to inflate     * @param root A view group that will be the parent.  Used to properly inflate the     * layout_* parameters.     * @see LayoutInflater     */    public static View inflate(Context context, int resource, ViewGroup root) {        LayoutInflater factory = LayoutInflater.from(context);        return factory.inflate(resource, root);    }

LayoutInflater.from(context)实际上是对方法1的包装，可参考以下源码：

    /**     * Obtains the LayoutInflater from the given context.     */    public static LayoutInflater from(Context context) {        LayoutInflater LayoutInflater =                (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);        if (LayoutInflater == null) {            throw new AssertionError("LayoutInflater not found.");        }        return LayoutInflater;    }