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);

     }

}