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, "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);                    }                }            }            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