android答题系统（三）：答题部分的实现
界面布局exam.xml
<LinearLayout 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:orientation="vertical" tools:context="com.mytest.exam.ExamActivity" > <ScrollView android:layout_width="match_parent" android:layout_height="match_parent" android:layout_weight="1" > <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="vertical" > <TextView android:id="@+id/ques_question" android:layout_width="match_parent" android:layout_height="wrap_content" /> <RadioGroup android:id="@+id/ques_radiogroup" android:layout_width="match_parent" android:layout_height="wrap_content" > <RadioButton android:id="@+id/ques_an1" android:layout_width="match_parent" android:layout_height="wrap_content" /> <RadioButton android:id="@+id/ques_an2" android:layout_width="match_parent" android:layout_height="wrap_content" /> <RadioButton android:id="@+id/ques_an3" android:layout_width="match_parent" android:layout_height="wrap_content" /> <RadioButton android:id="@+id/ques_an4" android:layout_width="match_parent" android:layout_height="wrap_content" /> </RadioGroup> <TextView android:id="@+id/ques_explain" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="" android:visibility="invisible" /> </LinearLayout> </ScrollView> <LinearLayout android:layout_width="match_parent" android:layout_height="match_parent" android:layout_weight="6" android:orientation="horizontal" > <Button android:id="@+id/btn_previous" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_weight="1" android:text="上一题" /> <Button android:id="@+id/btn_next" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_weight="1" android:text="下一题" /> </LinearLayout> </LinearLayout>
ExamActivity.java
package com.mytest.exam; import java.util.ArrayList; import java.util.List; import android.app.Activity; import android.app.AlertDialog; import android.content.DialogInterface; import android.os.Bundle; import android.util.Log; import android.view.View; import android.widget.Button; import android.widget.RadioButton; import android.widget.RadioGroup; import android.widget.TextView; public class ExamActivity extends Activity { private Button btn_next; private Button btn_previous; private TextView questionView; private TextView quesExplainView; private RadioButton[] radioButtons; private RadioGroup radioGroup; private int currQuesIdx = 0; private List<Question> quesList; private boolean wrongMode = false; // 是否核对答案 @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); setContentView(R.layout.exam); questionView = (TextView) this.findViewById(R.id.ques_question); quesExplainView = (TextView) this.findViewById(R.id.ques_explain); radioButtons = new RadioButton[4]; radioButtons[0] = (RadioButton) findViewById(R.id.ques_an1); radioButtons[1] = (RadioButton) findViewById(R.id.ques_an2); radioButtons[2] = (RadioButton) findViewById(R.id.ques_an3); radioButtons[3] = (RadioButton) findViewById(R.id.ques_an4); btn_next = (Button) findViewById(R.id.btn_next); btn_previous = (Button) findViewById(R.id.btn_previous); radioGroup = (RadioGroup) findViewById(R.id.ques_radiogroup); quesList = new DBService().getQuestions(); currQuesIdx = 0; Question currQues = quesList.get(currQuesIdx); setQuestionToGadioGroup(currQues); addListener(); } private void setQuestionToGadioGroup(Question ques) { radioButtons[0].setText(ques.getAnswerA()); radioButtons[1].setText(ques.getAnswerB()); radioButtons[2].setText(ques.getAnswerC()); radioButtons[3].setText(ques.getAnswerD()); questionView.setText(ques.getQuestion()); quesExplainView.setText(ques.getExplain()); } private void addListener() { // 下一题 btn_next.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { Log.v("info", "btn_next,currQuesIdx:" + currQuesIdx); if (currQuesIdx < quesList.size() - 1) { currQuesIdx++; Question ques = quesList.get(currQuesIdx); setQuestionToGadioGroup(ques); radioGroup.clearCheck(); if (ques.getSelectedAnswer() != -1) { radioButtons[ques.getSelectedAnswer()].setChecked(true); } } else if (currQuesIdx == quesList.size() - 1) { // 最后一题 final List<Integer> wrongList = checkAnswer(); if (wrongList.size() < 1) { new AlertDialog.Builder(ExamActivity.this).setTitle("提示").setMessage("恭喜你全部回答正确！") .setPositiveButton("确定", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { ExamActivity.this.finish(); } }).show(); } else if (currQuesIdx == quesList.size() - 1 && wrongMode == true) { new AlertDialog.Builder(ExamActivity.this).setTitle("提示").setMessage("已经到达最后一题，是否退出？") .setPositiveButton("确定", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { ExamActivity.this.finish(); } }).setNegativeButton("取消", null).show(); } else { new AlertDialog.Builder(ExamActivity.this) .setTitle("提示").setMessage("您答对了" + (quesList.size() - wrongList.size()) + "道题目，答错了" + wrongList.size() + "道题目。是否查看错题？") .setPositiveButton("确定", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { wrongMode = true; List<Question> newList = new ArrayList<Question>(); for (int i = 0; i < wrongList.size(); i++) { newList.add(quesList.get(wrongList.get(i))); } quesList.clear(); for (int i = 0; i < newList.size(); i++) { quesList.add(newList.get(i)); } currQuesIdx = 0; Question ques = quesList.get(currQuesIdx); setQuestionToGadioGroup(ques); quesExplainView.setVisibility(View.VISIBLE); } }).setNegativeButton("取消", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { ExamActivity.this.finish(); } }).show(); } } } }); // 上一题 btn_previous.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { Log.v("info", "btn_previous,currQuesIdx:" + currQuesIdx); if (currQuesIdx > 0) { currQuesIdx--; Question ques = quesList.get(currQuesIdx); setQuestionToGadioGroup(ques); radioGroup.clearCheck(); if (ques.selectedAnswer != -1) { radioButtons[ques.selectedAnswer].setChecked(true); } } } }); radioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() { @Override public void onCheckedChanged(RadioGroup group, int checkedId) { for (int i = 0; i < 4; i++) { if (radioButtons[i].isChecked()) { quesList.get(currQuesIdx).setSelectedAnswer(i); } } } }); } /** * 判断是否答对了 * * @param list * @return */ private List<Integer> checkAnswer() { List<Integer> wrongList = new ArrayList<Integer>(); for (int i = 0; i < quesList.size(); i++) { if (quesList.get(i).answer != quesList.get(i).selectedAnswer) { wrongList.add(i); } } return wrongList; } }
AndroidMainfest.xml
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.mytest.exam" android:versionCode="1" android:versionName="1.0" > <uses-sdk android:minSdkVersion="14" android:targetSdkVersion="21" /> <application android:allowBackup="true" android:icon="@drawable/ic_launcher" android:label="@string/app_name" android:theme="@style/AppTheme" > <activity android:name=".MainActivity" android:label="@string/app_name" > <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> <activity android:name="com.mytest.exam.ExamActivity" > </activity> </application> </manifest>