从assets中读取xml文件再动态的创建界面

我刚到公司的时候看程序代码，怎么都找不到对应的布局文件，后来才发现他们是从assets中读取一篇xml文件动态的创建界面，可能我是个初学者的原因还什么都没怎么见过，对此感到特别的好奇所以研究了一下。
1首先准备了一篇xml文件放到了assets目录下，

<?xml version="1.0" encoding="UTF-8"?>
<root>
    <assess_item title="评分项目" hide="true">
        <spinner title="姓名：" >[],张三,李四</spinner>
        <spinner >[],吃,喝,玩,乐</spinner>
        <input title="犯罪前科:" >无</input>
        <input title="既往史:" >无</input>
        <input title="身高:" >未测,卧床</input>
        <input title="体重:" >未测,卧床</input>
        <spinner title="文化程度：" >小学,初中,高中,大专,本科以上</spinner>
        <input title="饮酒:" />
        <input title="脉搏:" />
        <input title="呼吸:" />
        <input title="收缩压:"/>
        <input title="舒张压:" />
        <spinner title="意识:" >清楚,模糊,谵妄,嗜睡,昏迷</spinner>
        <spinner title="表情:" >正常,急性病容,慢性病容</spinner>
        <spinner title="言语:" >正常,含糊不清,失语</spinner>
        <input title="皮肤破损:" />
        <spinner title="营养状况:" >好,中,差</spinner>
        <spinner title="四肢:" >活动自如,功能障碍</spinner>
        <input title="四肢异常:" />
        <spinner title="感官功能:" >正常,异常</spinner>
        <input title="感官异常:" />
        <input title="排便异常:" />
        <spinner title="静脉输液:" >无,有,表浅静脉,套管针,PICC管,大静脉置管</spinner>
        <input title="输液部位:" />
        <input title="其他"/>
    </assess_item>
    <!-- <no_danger/> -->
    <!-- <export/> -->
</root>

最后加载完成的界面的效果。

添加布局文件主要的布局文件 activity_main.xml

<ScrollView xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" tools:context=".MainActivity" >



        <LinearLayout  android:id="@+id/ll_2" android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="vertical" >
        </LinearLayout>


</ScrollView>

上述代码就比较简单就是一个scrollView里边嵌套一个线性布局。
以下两个item，item.xml和item2.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="40dp" android:orientation="horizontal" >

    <TextView  android:id="@+id/tv_item_1" android:layout_width="0dp" android:layout_height="match_parent" android:layout_weight="2" android:gravity="center" android:text="身高：" />

    <Spinner  android:id="@+id/sp_item_1" android:layout_width="0dp" android:layout_height="match_parent" android:layout_weight="5" />

</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="horizontal" >

    <TextView  android:id="@+id/tv_item2_1" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="2" android:gravity="center" android:text="TextView:" />

    <EditText  android:id="@+id/et_item2_1" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="5" android:ems="10" >

        <requestFocus />
    </EditText>

</LinearLayout>

2 获取这篇xml文件的输入流；

AssetManager assetManager = this.getAssets();

            parser = Xml.newPullParser();


            InputStream is = assetManager.open("NurseAssess_InHospital.xml",AssetManager.ACCESS_STREAMING);//按顺序读取

这里用到了一个assetManger用这个类的open方法得到这篇xml文件的输入流。
给解析器设置输入流:

parser.setInput(is,"utf-8");
            int type;
            while ((type = parser.next()) != XmlPullParser.END_DOCUMENT) {
    if (type == XmlPullParser.START_TAG) {
    }
}

开始读取，

以下代码写在上边代码的if语句里边。

if (name.equals("spinner")) {
                        String tag = parser.getAttributeValue(null,"title");

                        Log.i("TAG","tag=" + tag);

                        inflater = getLayoutInflater();
                        view = inflater.inflate(R.layout.item,null);
                        textView = (TextView) view.findViewById(R.id.tv_item_1);
                        textView.setText(tag);

                        spinner = (Spinner) view.findViewById(R.id.sp_item_1);
                        String string = parser.nextText();
                        String[] strings = string.split(",");
                        // Log.i("TAG","string="+string);
                        list = new ArrayList<String>();
                        for (String string2 : strings) {
                            Log.i("TAG","string2" + string2);
                            list.add(string2);
                        }
                        Log.i("TAG","strings=" + strings);

                        adapter = new ArrayAdapter<String>(this,android.R.layout.simple_spinner_dropdown_item,list);
                        adapter.setDropDownViewResource(android.R.layout.simple_spinner_item);
                        spinner.setAdapter(adapter);

                        ll_2.addView(view);

if (name.equals("input")) {
                        inflater = getLayoutInflater();
                        String string = parser.getAttributeValue(null,"title");
                        Log.i("TAG","string=" + string);

                        View view = inflater.inflate(R.layout.item2,null);
                        et = (EditText) view.findViewById(R.id.et_item2_1);
                        textView2 = (TextView) view
                                .findViewById(R.id.tv_item2_1);

                        textView2.setText(string);

                        ll_2.clearFocus();
                        ll_2.setFocusable(true);
                        ll_2.setFocusableInTouchMode(true);
                        ll_2.addView(view);

                    }

以下是完整的MianActivity的代码：

package com.example.day1403;

import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;

import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserException;

import android.app.Activity;
import android.content.res.AssetManager;
import android.os.Bundle;
import android.util.Log;
import android.util.Xml;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.Spinner;
import android.widget.TextView;

public class MainActivity extends Activity {
    private Spinner spinner;
    private XmlPullParser parser;
    private LayoutInflater inflater;
    private ArrayAdapter<String> adapter;
    private List<String> list;
    private EditText et;
    private LinearLayout ll_2;
    private TextView textView;
    private TextView textView2;

    private View view;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ll_2 = (LinearLayout) findViewById(R.id.ll_2);
        getView();
    }

    private void getView() {
        try {

            AssetManager assetManager = this.getAssets();

            parser = Xml.newPullParser();
            Log.i("TAG","执行了");

            InputStream is = assetManager.open("NurseAssess_InHospital.xml",AssetManager.ACCESS_STREAMING);

            parser.setInput(is,"utf-8");
            int type;
            while ((type = parser.next()) != XmlPullParser.END_DOCUMENT) {
                String name = parser.getName();
                Log.i("TAG","name=" + name);
                if (type == XmlPullParser.START_TAG) {

                    if (name.equals("spinner")) {
                        String tag = parser.getAttributeValue(null,list);
                        adapter.setDropDownViewResource(android.R.layout.simple_spinner_item);
                        spinner.setAdapter(adapter);

                        ll_2.addView(view);
                    }
                    if (name.equals("input")) {
                        inflater = getLayoutInflater();
                        String string = parser.getAttributeValue(null,null);
                        et = (EditText) view.findViewById(R.id.et_item2_1);
                        textView2 = (TextView) view
                                .findViewById(R.id.tv_item2_1);

                        textView2.setText(string);

                        ll_2.clearFocus();
                        ll_2.setFocusable(true);
                        ll_2.setFocusableInTouchMode(true);
                        ll_2.addView(view);

                    }
                }
            }
            is.close;
        } catch (FileNotFoundException e) {
            Log.i("TAG","文件没找到");
            e.printStackTrace();
        } catch (XmlPullParserException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

}

因为我是新手难免有错误，希望有错误的地方大家积极指出谢谢