主界面MainActivity.java：
class="brush:java;gutter:true;">package com.hzhi.my_sax; import java.util.ArrayList; import android.os.Bundle; import android.app.Activity; import android.content.Intent; import android.util.Log; import android.view.Menu; import android.view.View; import android.widget.AdapterView; import android.widget.ArrayAdapter; import android.widget.Spinner; import android.widget.AdapterView.OnItemSelectedListener; public class MainActivity extends Activity implements OnItemSelectedListener{ public static final String str_school = "School"; public static final String str_major = "Major"; public static final String str_clas = "Class"; // 控件变量 public Spinner spn_school; public Spinner spn_major; public Spinner spn_clas; public infor m_infor; // 适配器容器 public ArrayList<school> arr_school = new ArrayList<school>(); public ArrayList<major> arr_major = new ArrayList<major>(); public ArrayList<clas> arr_clas = new ArrayList<clas>(); // 选择的项目编号 public int pos_school; public int pos_major; public int pos_class; // 选择班级次数 public int c_num = 0; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); // 获得控件 get_con(); // 设置适配器 ArrayAdapter<school> ada_school = new ArrayAdapter<school>(this, android.R.layout.simple_spinner_item, arr_school); ada_school.setDropDownViewResource( android.R.layout.simple_spinner_dropdown_item); spn_school.setAdapter(ada_school); ArrayAdapter<major> ada_major = new ArrayAdapter<major>(this, android.R.layout.simple_spinner_item, arr_major); ada_major.setDropDownViewResource( android.R.layout.simple_spinner_dropdown_item); spn_major.setAdapter(ada_major); ArrayAdapter<clas> ada_clas = new ArrayAdapter<clas>(this, android.R.layout.simple_spinner_item, arr_clas); ada_clas.setDropDownViewResource( android.R.layout.simple_spinner_dropdown_item); spn_clas.setAdapter(ada_clas); // 设置监听器 spn_school.setOnItemSelectedListener(this); spn_major.setOnItemSelectedListener(this); spn_clas.setOnItemSelectedListener(this); m_infor = new infor(); init(); } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.main, menu); return true; } // 获得控件 public void get_con(){ spn_school = (Spinner) findViewById(R.id.spn_school); spn_major = (Spinner) findViewById(R.id.spn_major); spn_clas = (Spinner) findViewById(R.id.spn_class); } // 选择学院 public void do_school_select() { //清除数据集 arr_major.clear(); arr_clas.clear(); //设置数据集 arr_major.addAll(m_infor.get_schools().get(pos_school).get_majors()); arr_clas.addAll( m_infor.get_schools().get(pos_school).get_majors().get(0).get_clases()); //通知数据集改变 ((ArrayAdapter)this.spn_major.getAdapter()).notifyDataSetChanged(); ((ArrayAdapter)this.spn_clas.getAdapter()).notifyDataSetChanged(); //初始化设置选择项 this.spn_major.setSelection(0); this.spn_clas.setSelection(0); c_num = 0; } // 选择专业 public void do_major_select() { //清除数据集 arr_clas.clear(); //设置数据集 arr_clas.addAll( m_infor.get_schools().get(pos_school).get_majors().get(pos_major).get_clases()); //通知数据集改变 ((ArrayAdapter)spn_clas.getAdapter()).notifyDataSetChanged(); //初始化设置选择项 spn_clas.setSelection(0); c_num = 0; } // 选择班级 public void do_class_select(){ if (c_num>0) { school b_school = m_infor.get_schools().get(pos_school); major b_major = b_school.get_majors().get(pos_major); clas b_clas = b_major.get_clases().get(pos_class); Intent i = new Intent(this, DetailActivity.class); i.putExtra(str_school, b_school); i.putExtra(str_major, b_major); i.putExtra(str_clas, b_clas); this.startActivity(i); } c_num++; } @Override public void onItemSelected(AdapterView<?> parent, View view, int pos, long id) { // TODO Auto-generated method stub switch(parent.getId()) { case R.id.spn_school: { pos_school = pos; do_school_select(); break; } case R.id.spn_major: { pos_major = pos; do_major_select(); break; } case R.id.spn_class: { pos_class = pos; do_class_select(); break; } } } @Override public void onNothingSelected(AdapterView<?> arg0) { // TODO Auto-generated method stub } // 清除数据集 public void clear_all_dataset(){ arr_school.clear(); arr_major.clear(); arr_clas.clear(); } // 通知所有数据集已经改变 public void notify_all_dataset(){ ((ArrayAdapter) spn_school.getAdapter()).notifyDataSetChanged(); ((ArrayAdapter) spn_major.getAdapter()).notifyDataSetChanged(); ((ArrayAdapter) spn_clas.getAdapter()).notifyDataSetChanged(); } // 设置数据集 public void add_all_dataset(){ arr_school.addAll(m_infor.get_schools()); arr_major.addAll(m_infor.get_schools().get(0).get_majors()); arr_clas.addAll(m_infor.get_schools().get(0).get_majors(). get(0).get_clases()); } // 初始化界面 public void init(){ super.onStart(); util.get_ins().parse( getResources().openRawResource(R.raw.infor),m_infor); // 清除数据集 clear_all_dataset(); // 设置数据集 add_all_dataset(); // 通知数据集改变 notify_all_dataset(); } }
最重要的语句是init()函数里面的
util.get_ins().parse(getResources().openRawResource(R.raw.infor),m_infor);
这条语句开始了解析infor.xml文件的过程，并将解析的结果放在变量m_infor里面。
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