【Android开发】考试系统

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一、开发环境需求

二、系统功能设计

三、运行结果

1. 欢迎界面

2. 主界面

3. 答题界面

四、主要代码

1. WelcomeActivity.java

代码如下：

package com.ssyw.exam2;import com.ssyw.exam2.controller.WelcomeController;import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.annotation.SuppressLint;import android.content.Intent;
import android.view.WindowManager;
import android.widget.ImageView;public class WelcomeActivity extends BaseActivity {//打开数据库private WelcomeController wc=new WelcomeController();private Handler mHandler = new Handler();  //创建handler对象private ImageView iv_welcome;              //创建视图对象private int alpha = 255;                   //透明度private int b = 0;                         //跳转标记@SuppressLint("HandlerLeak")@SuppressWarnings("deprecation")@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);//全屏显示getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);setContentView(R.layout.activity_welcome);wc.init(this);//绑定图像视图iv_welcome=(ImageView) findViewById(R.id.iv_welcome);//设置透明度iv_welcome.setAlpha(alpha);//创建线程并启动new Thread(new Runnable() {public void run() {//初次进入标记点为0while (b < 2) {try {if (b == 0) {Thread.sleep(500);b =1;} else {Thread.sleep(100);}//更新视图updateApp();} catch (InterruptedException e) {e.printStackTrace();}}}}).start();//接收handler消息mHandler = new Handler() {@Overridepublic void handleMessage(Message msg) {super.handleMessage(msg);iv_welcome.setAlpha(alpha); //设置透明度iv_welcome.invalidate();    //界面刷新}};}public void updateApp() {alpha -= 11;//避免出现白屏if (alpha <= 30) {b = 2;//当透明度小于30时 跳转到住页面Intent intent = new Intent(WelcomeActivity.this,MainTabActivity.class);startActivity(intent);this.finish();//关闭欢迎界面//查询需要很多内存开销，提前回收一些System.gc(); }//发送handler消息mHandler.sendMessage(mHandler.obtainMessage());}
}

2. activity_classics.xml

代码如下：

<<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent"android:layout_height="match_parent"android:orientation="vertical" ><!--经典例题页面布局--><includeandroid:id="@+id/layout_title_style_1"android:layout_width="match_parent"android:layout_height="0dp"android:layout_weight="1"layout="@layout/layout_title_style_1" /><ScrollViewandroid:layout_width="match_parent"android:layout_height="0dp"android:layout_weight="9" ><LinearLayoutandroid:layout_width="match_parent"android:layout_height="wrap_content"android:orientation="vertical" ><TextViewandroid:id="@+id/tv_classics_question"android:layout_width="wrap_content"android:layout_height="wrap_content" /><TextViewandroid:id="@+id/tv_classics_answer"android:layout_width="wrap_content"android:layout_height="wrap_content" /></LinearLayout></ScrollView><Buttonandroid:id="@+id/btn_classics_show_answer"android:layout_width="match_parent"android:layout_height="0dp"android:layout_weight="1"android:background="@drawable/bg_tab"android:onClick="showAnswer"android:text="@string/classics_show_answer" />
</LinearLayout>

以上是主要代码，完整文件可点击链接下载

https://download.csdn.net/download/qq_45647961/19662849