Android游戏小demo

xml文件内容：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:tools="http://schemas.android.com/tools"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:orientation="vertical"
 tools:context=".MainActivity">

 <TextView
 android:id="@+id/tv_target"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:text="小样把进度条拖到：100" />

 <SeekBar
 android:id="@+id/sb_bulsseye"
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:max="100"
 android:progress="0"/>

 <Button
 android:id="@+id/btn_help"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:text="帮助" />

 <Button
 android:id="@+id/btn_ok"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:text="搞定" />

 <Button
 android:id="@+id/btn_replay"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:text="重新开始" />

 <TextView
 android:id="@+id/tv_source"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:text="分数：0" />
 <TextView
 android:id="@+id/tv_index"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:text="局数：1" />
</LinearLayout>


activity文件内容：

package com.example.helloworld;

import androidx.appcompat.app.AlertDialog;
import androidx.appcompat.app.AppCompatActivity;
import androidx.appcompat.widget.TintContextWrapper;

import android.content.Context;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.SeekBar;
import android.widget.TextView;

import java.util.Random;

public class MainActivity extends AppCompatActivity {
 //属性
 TextView tvTarget;
 TextView tvSource;
 TextView tvIndex;
 SeekBar sbBulsseys;
 Button btnOk;
 Button btnReplay;
 Button btnHelp;
 int randomSource;
 int finalSource = 0;
 int index = 1;
 Context mContext;
 @Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_main);
 mContext = this;
 //一般初始化都会独立成一个方法
 findView();
 randomOfSource();
 setListener();
 }

 private void setListener() {
 //为事件源设置监听
 btnOk.setOnClickListener(new View.OnClickListener() {
 @Override
 public void onClick(View v) {
 //点击就会调用这个方法
 //算分数
 index++;
 int currentSource = sbBulsseys.getProgress();
 int source = 100 - Math.abs(currentSource-randomSource);
 finalSource = source + finalSource;
 setViewText();
 //按钮点击后就会重新出题
 randomOfSource();
 }
 });
 btnReplay.setOnClickListener(new View.OnClickListener() {
 @Override
 public void onClick(View v) {
 //重新生成随机数
 randomOfSource();
 finalSource = 0;
 index = 1;
 setViewText();
 }
 });
 btnHelp.setOnClickListener(new View.OnClickListener() {
 @Override
 public void onClick(View v) {
 AlertDialog.Builder builder = new AlertDialog.Builder(mContext);
 builder.setTitle("Help")
 .setMessage("这是帮助")
 .setPositiveButton("确认", new DialogInterface.OnClickListener() {
 @Override
 public void onClick(DialogInterface dialog, int which) {
 dialog.dismiss();
 }
 });
 AlertDialog dialog = builder.create();
 dialog.show();

 }
 });
 }

 //因为定义为属性了，不需要传参
 private void setViewText(){
 tvSource.setText("分数："+finalSource);
 tvIndex.setText("局数："+index);
 sbBulsseys.setProgress(0);
 }
 private void randomOfSource() {
 Random random = new Random();
 randomSource = random.nextInt(99) + 1;
 tvTarget.setText("小样将进度条拖到：" + randomSource);
 }

 private void findView() {
 tvTarget = (TextView)this.findViewById(R.id.tv_target);
 tvIndex = (TextView)this.findViewById(R.id.tv_index);
 tvSource = (TextView)this.findViewById(R.id.tv_source);
 sbBulsseys = (SeekBar)this.findViewById(R.id.sb_bulsseye);
 btnHelp = (Button)this.findViewById(R.id.btn_help);
 btnOk = (Button)this.findViewById(R.id.btn_ok);
 btnReplay = (Button)this.findViewById(R.id.btn_replay);
 }
}