性格色彩测试android程序开发之八--测试题的实现

思路：当用户点击dialog的确定按钮，监听事件就会激活测试题界面的activity。它负责显示测试题的题干，选项等信息，上下翻页等内容。为了能在显示activity的同时，显示试题信息。在该activity的oncreate()方法中调用了一个displayPorblems(currentNum)函数，他负责读取sqlite中数据库中的题目信息并显示在组件上。为了响应上下翻页按钮的功能，在处理按钮的代码中也调用了displayPorblems(currentNum)函数，每当用户翻页时，该函数都会从新读取并显示新的试题信息。

具体实现如下：

package logan.lejia;

import android.app.Activity;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.TextView;

public class TestingView extends Activity {
	TextView textview_title, textview_bottom;
	RadioButton buttonFir, buttonSec, buttonThir, buttonFour;
	RadioGroup radioGroup = null;
	Button buttonUp, buttonNext;
	private final int version = 1;
	private int currentNum = 1;

	public int getCurrentNum() {
		return currentNum;
	}

	public void setCurrentNum(int currentNum) {
		this.currentNum = currentNum;
	}

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		this.setContentView(R.layout.answview);
		// 试题的题干
		textview_title = (TextView) findViewById(R.id.textView_problems_title);
		// 单选按钮和按钮组
		buttonFir = (RadioButton) findViewById(R.id.radioButton1);
		buttonSec = (RadioButton) findViewById(R.id.radioButton2);
		buttonThir = (RadioButton) findViewById(R.id.radioButton3);
		buttonFour = (RadioButton) findViewById(R.id.radioButton4);
		radioGroup = (RadioGroup) findViewById(R.id.ButtonGroup);
		
		// 两个按钮中间的textview
		textview_bottom = (TextView) findViewById(R.id.textView_bottomView);
		textview_bottom.setText("第"+currentNum+"题/共有10题");
		textview_bottom.setTextSize(15);

		// 两个上下翻页的按钮
		buttonUp = (Button) findViewById(R.id.button_Up);
		buttonNext = (Button) findViewById(R.id.button_Next);
		// 监听
		buttonNext.setOnClickListener(new PageTuriningListener());
		buttonUp.setOnClickListener(new PageTuriningListener());
		TestingView.this.displayPorblems(currentNum);
	}

	class PageTuriningListener implements View.OnClickListener {
		// 获取当前题号
		int number = TestingView.this.getCurrentNum();

		@Override
		public void onClick(View v) {
			// TODO Auto-generated method stub
			// 判断是哪一个按钮触发了事件
			if (v.getId() == buttonUp.getId()) {
				// 上翻页
				if (number == 1) {
					// 若这一题已经是第一题，则不显示上翻页按钮
					v.setVisibility(View.INVISIBLE);
				} else {
					v.setVisibility(View.VISIBLE);
				}
				TestingView.this.setCurrentNum(number--);
				// 刷新测试题
				TestingView.this.displayPorblems(number);
			} else if (v.getId() == buttonNext.getId()) {
				// 下翻页
				if (number == 10) {
					// 若这一题已经是最后一题，则不显示下翻页按钮
					v.setVisibility(View.INVISIBLE);
				} else {
					v.setVisibility(View.VISIBLE);
					TestingView.this.setCurrentNum(number++);
					// 刷新测试题
					TestingView.this.displayPorblems(number);
				}
			}
		}
	}

	public void displayPorblems(int currentNum) {
		SQLiteHelper helper = new SQLiteHelper(this, "android_lejia", null,
				version);
		// 获取可以进行增删改查的数据库实例
		SQLiteDatabase database = helper.getReadableDatabase();
		Cursor cursor = database.query("test", new String[] { "id", "title",
				"first", "second", "third", "fourth" }, "id=?",
				new String[] { currentNum + "" }, null, null, null);
		cursor.moveToNext();
		// 共有6列，标号从0-5
		System.out.println(cursor.getColumnCount());
		// String id = cursor.getString(0);//题号
		cursor.moveToFirst();
		String title = cursor.getString(1);// 题干
		String first = cursor.getString(2);// 选项A
		String second = cursor.getString(3);// 选项B
		String third = cursor.getString(4);// 选项C
		String fourth = cursor.getString(5);// 选项D
		cursor.close();
		database.close();
		textview_title.setText(title);
		buttonFir.setText(first);
		buttonSec.setText(second);
		buttonThir.setText(third);
		buttonFour.setText(fourth);
	}
}