利用Android开发一个扫雷小游戏

//设置翻开状态
public void setNumberOfSurroundingMines(int number) {
  this.setBackgroundResource(R.drawable.selected);//设置翻开背景图
  updateNumber(number);//设置周围雷数
}

//添加雷块标识
public void setMineIcon() {
  this.setBackgroundResource(R.drawable.dl);
}

//添加标记标识
public void setFlagIcon(boolean enabled) {

  if (!enabled) {
    this.setBackgroundResource(R.drawable.hq);
  } else {
    this.setTextColor(Color.BLACK);
  }
}

//清除所有标记
public void clearAllIcons() {
  this.setText("");
  this.setTextColor(R.drawable.unselected);
}

private void setBoldFont() {
  this.setTypeface(null, Typeface.BOLD);
}

//翻开方块
public void OpenBlock() {
  if (!isCovered) {
    return;
  }
  isCovered = false;
  //如果为雷设置地雷标识
  if (hasMine()) {
    setMineIcon();
  } else {
    setNumberOfSurroundingMines(numberOfMinesInSurrounding);//根据周围雷数设置翻开状态及显示数字
  }
}

package com.example.saolei;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;
import android.view.View;

public class LevelActivity extends AppCompatActivity {

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_level);
  }

  /*根据不同难度返回相应参数*/
  public void Easy(View view) {
    Intent data = new Intent();
    data.putExtra("result", "easy");
    setResult(2, data);
    finish();
  }

  public void Hard(View view) {
    Intent data = new Intent();
    data.putExtra("result", "hard");
    setResult(2, data);
    finish();
  }

  public void Return(View view) {
    Intent data = new Intent();
    data.putExtra("result", "");
    setResult(2, data);
    finish();
  }
}

package com.example.saolei;

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

import android.content.Intent;
import android.os.Bundle;
import android.view.View;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Scanner;

public class MenuActivity extends AppCompatActivity {
  String t = "easy";
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_menu);
  }

  @Override
  //接收难度界面传回的参数并将其传回主界面处理
  protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if (resultCode == 2) {
      Intent level = new Intent();
      t = data.getStringExtra("result");
      level.putExtra("result", t);
      setResult(1, data);
      finish();
    }
  }

  //点击新游戏按钮，将结果传回主界面
  public void NewGame(View view) {
    Intent data = new Intent();
    data.putExtra("result", "newgame");
    setResult(1, data);
    finish();
  }

  //点击改变难度按钮，启动难度选择界面
  public void ChangeLevel(View view) {
    Intent level = new Intent(MenuActivity.this, LevelActivity.class);
    startActivityForResult(level, 2);
  }

  //点击游戏记录按钮，显示记录
  public void Record(View view) {
    String filename = getExternalCacheDir().getAbsolutePath() + "/gamerecord.txt";//文件路径
    File file = new File(filename);
    Scanner inputStream = null;
    FileInputStream fis = null;
    BufferedReader br = null;
    String str;
    String message = "   " + "级别" + "    " + "胜负" + "     " + "时间\n";
    //若文件不存在，显示暂无记录
    if (!file.exists()) {
      new AlertDialog.Builder(this)
          .setMessage("暂无记录！")
          .setNegativeButton("确定", null)
          .create().show();
    }
    else {
      try {
        //读取文件记录并生成对话框显示
        inputStream = new Scanner(new FileInputStream(filename));
        int i = 1;
        fis = new FileInputStream(filename);
        br = new BufferedReader(new InputStreamReader(fis));
        while ((str = br.readLine()) != null) {
          message = message + (i + ". " + str + "\n");
          i++;
        }
        new AlertDialog.Builder(this)
            .setMessage(message)
            .setNegativeButton("确定", null)
            .create().show();
        fis.close();
        br.close();
      } catch (FileNotFoundException e) {
        e.printStackTrace();
      } catch (IOException e) {
        e.printStackTrace();
      } finally {
        inputStream.close();
      }
    }
  }

  //点击返回按钮，回传结果到主界面
  public void Return1(View view) {
    Intent data = new Intent();
    data.putExtra("result", "start");
    setResult(1, data);
    finish();
  }
}