Android studio入门到精通实例实验

实验内容：

----------------- 简单的考试程序----------------

实验步骤：

一、打开Android studio，新建一个项目；

二、写入代码；

<?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">

<TextViewandroid: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" /><EditTextandroid: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"android:layout_marginLeft="16dp" /><TextViewandroid: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" /><TextViewandroid: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" /><RadioGroupandroid:id="@+id/radioGroup"android:layout_width="113dp"android:layout_height="64dp"app:layout_constraintStart_toStartOf="@+id/textView3"app:layout_constraintTop_toBottomOf="@+id/textView3"><RadioButtonandroid:id="@+id/rd1"android:layout_width="match_parent"android:layout_height="wrap_content"android:text="开源的" /><RadioButtonandroid:id="@+id/rd2"android:layout_width="match_parent"android:layout_height="wrap_content"android:text="非开源的" />
</RadioGroup><TextViewandroid: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" /><CheckBoxandroid: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"android:layout_marginLeft="60dp" /><CheckBoxandroid: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" /><CheckBoxandroid: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"android:layout_marginLeft="60dp" /><TextViewandroid: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" /><Spinnerandroid: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" /><TextViewandroid:id="@+id/textView6"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_marginStart="104dp"android:layout_marginBottom="36dp"android:text="总分："app:layout_constraintBottom_toTopOf="@+id/button"app:layout_constraintStart_toStartOf="parent"android:layout_marginLeft="104dp" /><TextViewandroid: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" /><Buttonandroid: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>

package com.example.a37;

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(){@Overridepublic void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {// TODO Auto-generated method stubif(isChecked) cb_num++;else cb_num--;}});checkBox2.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener(){@Overridepublic void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {// TODO Auto-generated method stubif(isChecked) cb_num--;else cb_num++;}});checkBox3.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener(){@Overridepublic void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {// TODO Auto-generated method stubif(isChecked) cb_num++;else cb_num--;}});//设置单选按钮组添加事件监听rd.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {@Overridepublic 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() {@Overridepublic boolean onEditorAction(TextView textView, int i, KeyEvent keyEvent) {if(et_on.getText().toString().equals("2")) 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@Overridepublic void onNothingSelected(AdapterView<?> parent) {// Another interface callback}});button.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {if(cb_num == 2) i++;if(sp_num) i++;if(et_num) i++;if(rd_num) i++;sorce.setText("   "+(i*50)+"   ");if(i == 4)Toast.makeText(MainActivity.this,"你真棒！祝贺你！", Toast.LENGTH_SHORT).show();else if(i == 2)Toast.makeText(MainActivity.this,"成绩合格！", Toast.LENGTH_SHORT).show();elseToast.makeText(MainActivity.this,"成绩不合格！", Toast.LENGTH_SHORT).show();}});
}

}

<string name="app_name" translatable="false">zuoye06_231</string>
<string name="di1ti" translatable="false">选择题</string>
<string name="di2ti" translatable="false">Android操作系统是（50分）</string>
<string name="di3ti" translatable="false">Android Studio 开发Android程序，还需安装：（    ）（50分）</string><string name="subscribe" translatable="false">提交</string>
<string name="di4ti" translatable="false">" "</string>

三、运行结果截图：
1、（打开程序界面）

2、（回答错误界面）

3、（通过考试界面）

到此本次实验完成！