Android使用SAX解析XML(3)

时间：2023-03-08 21:13:20

主界面MainActivity.java：

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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