android studio实现简单考试应用程序
一、问题
1、如图所示,设计一个包含四种题型的简单考试应用程序(具体考试题目可以选用以下设计,也可以自己另外确定),项目名称:zuoye06_666 ;(666,改成自己的实际编号)。
2、布局管理器任选(约束布局相对容易实现)。
3、“提交”按钮的Text通过字符串资源赋值,不要直接输入“提交”两个字。
4、每题按25分计算,编写相应的程序,答题完成后单击“提交”按钮,在“总得分:”右边文本框中显示实际得分;同时,显示一个Toast消息框:
答对不足3题,显示:“还需努力啊!”;
答对3题,显示:“祝贺你通过考试!”;
全部答对,显示:“你真棒!祝贺你!”
二、分析
1.这次作业比较简单,就是上课讲的东西的集合,练习spinner、checkbox、radiobutton、edittext以及button的监听,还有setText和Toast用法。
2.注意点,要考虑到正常考试的时候学生第一次选对后来改错,或者一开始选错后来改对的情况,所以添加了boolean类型的以及checkbox的计数。
三、代码
1.布局代码
<?xml version="1.0" encoding="utf-8"?> <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context=".MainActivity"> <TextView android:id="@+id/textView2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Android基础知识测评" app:layout_constraintBottom_toBottomOf="parent" app:layout_constraintHorizontal_bias="0.498" app:layout_constraintLeft_toLeftOf="parent" app:layout_constraintRight_toRightOf="parent" app:layout_constraintTop_toTopOf="parent" app:layout_constraintVertical_bias="0.058" /> <EditText android:id="@+id/et_on" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginStart="16dp" android:ems="3" android:inputType="textPersonName" app:layout_constraintBottom_toBottomOf="@+id/textView" app:layout_constraintStart_toStartOf="parent" app:layout_constraintTop_toTopOf="@+id/textView" app:layout_constraintVertical_bias="0.615" /> <TextView android:id="@+id/textView" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginTop="20dp" android:text="@string/di1ti" app:layout_constraintStart_toEndOf="@+id/et_on" app:layout_constraintTop_toBottomOf="@+id/textView2" /> <TextView android:id="@+id/textView3" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginTop="20dp" android:text="@string/di2ti" app:layout_constraintStart_toStartOf="@+id/et_on" app:layout_constraintTop_toBottomOf="@+id/textView" /> <RadioGroup android:id="@+id/radioGroup" android:layout_width="113dp" android:layout_height="64dp" app:layout_constraintStart_toStartOf="@+id/textView3" app:layout_constraintTop_toBottomOf="@+id/textView3"> <RadioButton android:id="@+id/rd1" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="开源的" /> <RadioButton android:id="@+id/rd2" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="非开源的" /> </RadioGroup> <TextView android:id="@+id/textView4" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginTop="20dp" android:text="@string/di3ti" app:layout_constraintStart_toStartOf="@+id/textView3" app:layout_constraintTop_toBottomOf="@+id/radioGroup" /> <CheckBox android:id="@+id/cb2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginStart="60dp" android:text="JAVA" app:layout_constraintStart_toEndOf="@+id/cb1" app:layout_constraintTop_toBottomOf="@+id/textView4" /> <CheckBox android:id="@+id/cb1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="JDK" app:layout_constraintStart_toStartOf="@+id/textView4" app:layout_constraintTop_toBottomOf="@+id/textView4" /> <CheckBox android:id="@+id/cb3" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginStart="60dp" android:text="SDK" app:layout_constraintStart_toEndOf="@+id/cb2" app:layout_constraintTop_toBottomOf="@+id/textView4" /> <TextView android:id="@+id/textView5" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginTop="20dp" android:text="@string/di4ti" app:layout_constraintStart_toStartOf="@+id/textView4" app:layout_constraintTop_toBottomOf="@+id/cb1" /> <Spinner android:id="@+id/spinner" android:layout_width="130dp" android:layout_height="30dp" android:entries="@array/Systems" app:layout_constraintStart_toStartOf="@+id/textView5" app:layout_constraintTop_toBottomOf="@+id/textView5" /> <TextView android:id="@+id/textView6" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginStart="104dp" android:layout_marginBottom="36dp" android:text="总得分:" app:layout_constraintBottom_toTopOf="@+id/button" app:layout_constraintStart_toStartOf="parent" /> <TextView android:id="@+id/sorce" android:layout_width="wrap_content" android:layout_height="wrap_content" android:background="#F1ED06" android:text=" 00 " app:layout_constraintBottom_toBottomOf="@+id/textView6" app:layout_constraintEnd_toEndOf="parent" app:layout_constraintHorizontal_bias="0.025" app:layout_constraintStart_toEndOf="@+id/textView6" app:layout_constraintTop_toTopOf="@+id/textView6" app:layout_constraintVertical_bias="0.0" /> <Button android:id="@+id/button" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginBottom="20dp" android:text="@string/subscribe" app:layout_constraintBottom_toBottomOf="parent" app:layout_constraintEnd_toEndOf="parent" app:layout_constraintStart_toStartOf="parent" /> </androidx.constraintlayout.widget.ConstraintLayout>
2.strings.xml
<resources> <string name="app_name">zuoye06_231</string> <string name="di1ti">年11月5日,Google发布安卓系统(答:2007)</string> <string name="di2ti">Android操作系统是(答:开源的)</string> <string name="di3ti">Android Studio 开发Android程序,还需安装:(1、3)</string> <string name="di4ti">Android是基于?平台手机的操作系统(Linux)</string> <string name="subscribe">提交</string> </resources>
3.Systems.xml
<?xml version="1.0" encoding="utf-8"?> <resources> <string-array name="Systems"> <item>Windows</item> <item>Linux</item> <item>Mac</item> </string-array> </resources>
4.java代码
package com.example.lenovo.zuoye06_231; import androidx.appcompat.app.AppCompatActivity; import android.os.Bundle; import android.view.KeyEvent; import android.view.View; import android.widget.AdapterView; import android.widget.Button; import android.widget.CheckBox; import android.widget.RadioButton; import android.widget.RadioGroup; import android.widget.Spinner; import android.widget.TextView; import android.widget.Toast; import android.widget.CompoundButton; public class MainActivity extends AppCompatActivity { static int i = 0,cb_num = 0; boolean rd_num = false,sp_num = false,et_num = false; TextView sorce; TextView et_on; RadioGroup rd; Button button; CheckBox checkBox1; CheckBox checkBox2; CheckBox checkBox3; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); //定义 et_on = findViewById(R.id.et_on); sorce = findViewById(R.id.sorce); rd = findViewById(R.id.radioGroup); button = findViewById(R.id.button); checkBox1 = findViewById(R.id.cb1); checkBox2 = findViewById(R.id.cb2); checkBox3 = findViewById(R.id.cb3); //为每个复选按钮设置状态改变监听器 checkBox1.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener(){ @Override public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) { // TODO Auto-generated method stub if(isChecked) cb_num++; else cb_num--; } }); checkBox2.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener(){ @Override public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) { // TODO Auto-generated method stub if(isChecked) cb_num--; else cb_num++; } }); checkBox3.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener(){ @Override public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) { // TODO Auto-generated method stub if(isChecked) cb_num++; else cb_num--; } }); //设置单选按钮组添加事件监听 rd.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() { @Override public void onCheckedChanged(RadioGroup group, int checkedId) { //获取被选择的单选按钮 RadioButton r = (RadioButton) findViewById(checkedId); if(r.getText().equals("开源的")) rd_num = true; else rd_num = false; } }); //edittext监听 et_on.setOnEditorActionListener(new TextView.OnEditorActionListener() { @Override public boolean onEditorAction(TextView textView, int i, KeyEvent keyEvent) { if(et_on.getText().toString().equals("2007")) et_num = true; else et_num = false; return false; } }); //获取下拉列表对象 final Spinner spinner = (Spinner) findViewById(R.id.spinner); //为Spinner添加选择监听器 spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() { @Override //数据选择事件处理 public void onItemSelected(AdapterView<?> parent, View view, int pos, long id) { String[] Systems = getResources().getStringArray(R.array.Systems); //显示选择结果 if(Systems[pos].equals("Linux")) sp_num = true; else sp_num = false; } //以下方法重写必须有 @Override public void onNothingSelected(AdapterView<?> parent) { // Another interface callback } }); button.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { if(cb_num == 2) i++; if(sp_num) i++; if(et_num) i++; if(rd_num) i++; sorce.setText(" "+(i*25)+" "); if(i == 4) Toast.makeText(MainActivity.this,"你真棒!祝贺你!", Toast.LENGTH_SHORT).show(); else if(i == 3) Toast.makeText(MainActivity.this,"祝贺你通过考试!", Toast.LENGTH_SHORT).show(); else Toast.makeText(MainActivity.this,"还需努力啊!", Toast.LENGTH_SHORT).show(); } }); } }