Android小项目-简易刷题app
界面演示
主界面
选择界面
选择界面
答题界面
代码示例
activity_answeractivity.xml
activity_listprj.xml
activity_main.xml
mainactivity.java
package test.four;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Toast;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
public class MainActivity extends AppCompatActivity {
private static String DB_PATH = "/data/data/test.four/databases/";
private static String DB_NAME = "question.db";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initDBFile();
}
public void initDBFile(){
if (new File(DB_PATH + DB_NAME).exists() == false) {
File dir = new File(DB_PATH);
if (!dir.exists()) {
dir.mkdir();
}
//复制文件
try {
InputStream is = getResources().getAssets().open(DB_NAME);
OutputStream os = new FileOutputStream(DB_PATH + DB_NAME);
//用来复制文件
byte[] buffer = new byte[1024];
//保存已经复制的长度
int length;
//开始复制
while ((length = is.read(buffer)) > 0) {
os.write(buffer, 0, length);
}
//刷新
os.flush();
//关闭
os.close();
is.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
public boolean onCreateOptionsMenu(Menu menu){
super.onCreateOptionsMenu(menu);
getMenuInflater().inflate(R.menu.index_menu,menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item){
switch (item.getItemId()){
case R.id.item_select:
this.showListDialog();
break;
case R.id.item_share:
Toast.makeText(this,"调用api",Toast.LENGTH_SHORT).show();
break;
case R.id.item_about:
Toast.makeText(this, "关于对话框", Toast.LENGTH_SHORT).show();
break;
case R.id.item_support:
Toast.makeText(this, "不清楚", Toast.LENGTH_SHORT).show();
break;
}
return super.onOptionsItemSelected(item);
}
private void showListDialog(){
final String[] items = {"一级office","二级office","一级c","二级c","1","2","2","2","2","2","2","2","2","2","2"};
AlertDialog.Builder listDialog = new AlertDialog.Builder(this);
listDialog.setTitle("选择科目");
listDialog.setItems(items, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
}
});
listDialog.show();
}
public void onZquestion(View w){
Intent km = new Intent(MainActivity.this,listactivity.class);
startActivity(km);
}
public void onCquestion(View w){
}
public void onSquestion(View w){
}
}
listactivity.java
package test.four;
import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
public class listactivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_listprj);
final String[] year = {"2018上半年","2018下半年",
"2017上半年","2017下半年","2016上半年","2016下半年","2015上半年",
"2015下半年","2014上半年","2014下半年","2013上半年","2013下半年",
"2012上半年","2012下半年","2011上半年","2011下半年","2010上半年",
"2010下半年"};
ListView lv = (ListView)findViewById(R.id.listkm);
ArrayAdapter adpterar = new ArrayAdapter(listactivity.this,android.R.layout.simple_list_item_1,year);
lv.setAdapter(adpterar);
lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView parent, View view, int position, long id) {
int tem = position;
switch (tem){
case 0:
Intent all = new Intent(listactivity.this,answeractivity.class);
startActivity(all);
break;
}
}
});
}
}
answeractivity.java
package test.four;
import android.os.Bundle;
import android.support.annotation.IdRes;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.TextView;
import java.util.List;
public class answeractivity extends AppCompatActivity {
private List qulist;
private DBSever dbsever;
private boolean flag = true;
private RadioButton[] Radios = new RadioButton[4];
private RadioGroup radioGroup;
private TextView vwr,vwt;
private Button btn;
private Question question;
private int index = 0;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_answeractivity);
initview();
initDBSever();
setGroupListener();
}
private void initDBSever(){
dbsever = new DBSever();
qulist = dbsever.getQuestions();
dbsever.Close();
question = qulist.get(index);
vwt.setText(question.question);
Radios[0].setText(question.answerA);
Radios[1].setText(question.answerB);
Radios[2].setText(question.answerC);
Radios[3].setText(question.answerD);
// Radios[3].setText("D,helloworld");
}
private void initview(){
vwr = (TextView) findViewById(R.id.tv_result);
vwt = (TextView) findViewById(R.id.tv_title);
btn = (Button) findViewById(R.id.btn_result);
Radios[0] = (RadioButton) findViewById(R.id.RadioA);
Radios[1] = (RadioButton) findViewById(R.id.RadioB);
Radios[2] = (RadioButton) findViewById(R.id.RadioC);
Radios[3] = (RadioButton) findViewById(R.id.RadioD);
radioGroup = (RadioGroup) findViewById(R.id.mRadioGroup);
}
private void setGroupListener(){
radioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(RadioGroup group, @IdRes int checkedId) {
for(int i=0; i<4; ++i){
if(Radios[i].isChecked() == true){
question.selectedAnswer = i;
}
}
}
});
}
public void showanswer(View v){
vwr.setText("");
if(flag == true){
flag = false;
btn.setText("隐藏答案");
if(question.selectedAnswer == question.answer){
vwr.setText("答对了:");
}
else{
vwr.setText("答错了:");
}
vwr.setVisibility(View.VISIBLE);
}else {
flag = true;
btn.setText("显示答案");
vwr.setVisibility(View.INVISIBLE);
}
vwr.append(question.explanation);
}
public void previousquestion(View v){
if(index == 0){
return;
}
vwr.setText("");
radioGroup.clearCheck();
index = index - 1;
question = qulist.get(index);
vwt.setText(question.question);
Radios[0].setText(question.answerA);
Radios[1].setText(question.answerB);
Radios[2].setText(question.answerC);
Radios[3].setText(question.answerD);
}
public void nextquestion(View v){
if(index == qulist.size()-1){
return;
}
vwr.setText("");
radioGroup.clearCheck();
index = index + 1;
question = qulist.get(index);
vwt.setText(question.question);
Radios[0].setText(question.answerA);
Radios[1].setText(question.answerB);
Radios[2].setText(question.answerC);
Radios[3].setText(question.answerD);
}
}
数据
package test.four;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import java.util.ArrayList;
import java.util.List;
/**
* Created by Administrator on 2018/6/18.
*/
public class DBSever {
private SQLiteDatabase db;
public DBSever(){
db = SQLiteDatabase.openDatabase("/data/data/test.four/databases/question.db",
null,SQLiteDatabase.OPEN_READONLY|SQLiteDatabase.NO_LOCALIZED_COLLATORS);
}
public List getQuestions() {
List questionList = new ArrayList<>();
Cursor cursor = db.rawQuery("select * from question", null);
if (cursor.getCount() > 0) {
cursor.moveToFirst();
int count = cursor.getCount();
//遍历
for (int i = 0; i < count; i++) {
cursor.moveToPosition(i);
Question question = new Question();
//ID
question.ID = cursor.getInt(cursor.getColumnIndex("ID"));
//问题
question.question = cursor.getString(cursor.getColumnIndex("question"));
//四个选择
question.answerA = cursor.getString(cursor.getColumnIndex("answerA"));
question.answerB = cursor.getString(cursor.getColumnIndex("answerB"));
question.answerC = cursor.getString(cursor.getColumnIndex("answerC"));
question.answerD = cursor.getString(cursor.getColumnIndex("answerD"));
//答案
question.answer = cursor.getInt(cursor.getColumnIndex("answer"));
//解析
question.explanation = cursor.getString(cursor.getColumnIndex("explanation"));
//设置为没有选择任何选项
question.selectedAnswer = -1;
questionList.add(question);
}
}
return questionList;
}
public void Close(){
db.close();
}
}
注意
1.部分逻辑尚未实现
2.由于用到了sqlite数据库，需要自己建一个资源文件夹assets并将question.db放在此目录
3.全部源码 源码