DBService.class
//此类用于连接数据库public class DBService {
private SQLiteDatabase db;
public DBService(){
db=SQLiteDatabase.openDatabase("/data/data/test.ljh.com.answering/databases/question.db",null,SQLiteDatabase.OPEN_READWRITE); }
public List getQuestions(){
List list=new ArrayList();
Cursor cursor=db.rawQuery("select * from question",null);
if(cursor.getCount()>0){ //大于0表示取得数据
cursor.moveToFirst();
int count=cursor.getCount();
for(int i=0;i ExamActivity.class
public class ExamActivity extends AppCompatActivity {
private int count;
private int current;
private boolean wrongMode;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_exam);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() { @Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own action",
Snackbar.LENGTH_LONG) .setAction("Action", null).show(); } });
DBService dbService=new DBService();
final List list=dbService.getQuestions();
count=list.size();
current=0;
wrongMode=false;
final TextView tv_question=(TextView)findViewById(R.id.question);
final RadioButton[] radioButtons=new RadioButton[4];
radioButtons[0]=(RadioButton)findViewById(R.id.answerA);
radioButtons[1]=(RadioButton)findViewById(R.id.answerB);
radioButtons[2]=(RadioButton)findViewById(R.id.answerC);
radioButtons[3]=(RadioButton)findViewById(R.id.answerD);
Button btn_next=(Button)findViewById(R.id.btn_next); Button
btn_previous=(Button)findViewById(R.id.btn_previous); final
TextView tv_explaination=(TextView)findViewById(R.id.explaination);
final RadioGroup radioGroup=(RadioGroup)findViewById(R.id.radioGroup);
Question q=list.get(0);
tv_question.setText(q.question);
tv_explaination.setText(q.explaination);
radioButtons[0].setText(q.answerA);
radioButtons[1].setText(q.answerB);
radioButtons[2].setText(q.answerC);
radioButtons[3].setText(q.answerD);
btn_next.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (current < count - 1) {
current++;
Question q = list.get(current);
tv_question.setText(q.question);
tv_explaination.setText(q.explaination);
radioButtons[0].setText(q.answerA);
radioButtons[1].setText(q.answerB);
radioButtons[2].setText(q.answerC);
radioButtons[3].setText(q.answerD);
radioGroup.clearCheck();
if (q.selectedAnswer != -1) {
radioButtons[q.selectedAnswer].setChecked(true); }
}
else if (current == count - 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 {
final List wrongList = checkAnswer(list);
new AlertDialog.Builder(ExamActivity.this)
.setTitle("提示")
.setMessage("你答对了" + (list.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 newList = new ArrayList();
for (int i = 0; i < wrongList.size(); i++) {
newList.add(list.get(wrongList.get(i))); }
list.clear();
for (int i = 0; i < newList.size(); i++) {
list.add(newList.get(i)); }
current = 0;
count = list.size();
Question q = list.get(current);
tv_question.setText(q.question);
tv_explaination.setText(q.explaination);
radioButtons[0].setText(q.answerA);
radioButtons[1].setText(q.answerB);
radioButtons[2].setText(q.answerC);
radioButtons[3].setText(q.answerD);
tv_explaination.setVisibility(View.VISIBLE); }
})
.setNegativeButton("取消", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
ExamActivity.this.finish(); }
}).show(); } } });
btn_previous.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (current > 0)//当前问题是否第一个问题,大于0表示不是
{
current--;
Question q = list.get(current);
tv_question.setText(q.question);
tv_explaination.setText(q.explaination);
radioButtons[0].setText(q.answerA);
radioButtons[1].setText(q.answerB);
radioButtons[2].setText(q.answerC);
radioButtons[3].setText(q.answerD);
radioGroup.clearCheck();
if (q.selectedAnswer != -1) {
radioButtons[q.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()==true){
list.get(current).selectedAnswer=i;
break;
} } } }); }
private List checkAnswer(List list){
List wrongList=new ArrayList();
for(int i=0;i MainActivity
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main); String
DB_PATH="/data/data/test.ljh.com.answering/databases/";
String DB_NAME="question.db";
if((new File(DB_PATH+DB_NAME).exists())==false){
File dir=new File(DB_PATH);
if(!dir.exists()){
dir.mkdir();
}
try{
InputStream is=getBaseContext().getAssets().open(DB_NAME);
OutputStream os=new FileOutputStream(DB_PATH+DB_NAME);
byte[] buffer=new byte[1024];
int length;
while ((length=is.read(buffer))>0){
os.write(buffer,0,length);
}
os.flush();
os.close();
is.close();
} catch (IOException e) {
e.printStackTrace();
}
}
Button btn=(Button)findViewById(R.id.button);
btn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent=new Intent(MainActivity.this,ExamActivity.class);
startActivity(intent);
}
});
}}
Question.class
public class Question {
public String question;
public String answerA;
public String answerB;
public String answerC;
public String answerD;
public int answer;
public String explaination;
public int ID;
public int selectedAnswer;}