LayoutInflater作用是将layout的xml布局文件实例化为View类对象。

获取LayoutInflater的方法有如下三种:

LayoutInflater inflater=(LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); View layout = inflater.inflate(R.layout.main, null ); LayoutInflater inflater = LayoutInflater.from(context); (该方法实质就是第一种方法，可参考源代码) View layout = inflater.inflate(R.layout.main, null ); LayoutInflater inflater = getLayoutInflater();（在Activity中可以使用，实际上是View子类下window的一个函数） View layout = inflater.inflate(R.layout.main, null );

使用方法：

public class MyInflate extends Activity{      private TextView tv;      public void OnCreate(Bundle savedInstanceState){          super .onCreate(savedInstanceState);          //setContentView(R.layout.main);          //tv = (TextView) findViewById(R.id.tv);          LayoutInflater inflate = LayoutInflater.from( this );          View view = inflate.inflate(R.layout.main, null );          setContentView(view);      } }