Android Service生命周期与数据更新：避免重复执行和数据不同步

public class ForegroundService extends Service {
    double x1 = MainActivity.x1; // 仅在Service首次创建时初始化
    // ...
}

import android.content.Intent;
import android.os.Build;
import android.os.Bundle;
import android.widget.Button;
import androidx.appcompat.app.AppCompatActivity;

public class MainActivity extends AppCompatActivity {

    private double currentX1 = 35.0; // 示例初始值

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main); // 假设您有一个包含按钮的布局

        Button startServiceButton = findViewById(R.id.start_service_button);
        Button updateServiceButton = findViewById(R.id.update_service_button);
        Button stopServiceButton = findViewById(R.id.stop_service_button);

        // 首次启动Service
        startServiceButton.setOnClickListener(v -> {
            startMyService(currentX1, 10.0, 5.0, 1);
        });

        // 更新数据并“重启”Service（实际是调用onStartCommand）
        updateServiceButton.setOnClickListener(v -> {
            currentX1 += 0.5; // 模拟数据变化
            startMyService(currentX1, 10.0, 5.0, 1); // 再次发送Intent，携带新数据
        });

        // 停止Service
        stopServiceButton.setOnClickListener(v -> {
            stopMyService();
        });
    }

    private void startMyService(double x1, double y1, double radius, int k) {
        Intent serviceIntent = new Intent(this, MyForegroundService.class);
        serviceIntent.putExtra(MyForegroundService.EXTRA_X1, x1);
        serviceIntent.putExtra(MyForegroundService.EXTRA_Y1, y1);
        serviceIntent.putExtra(MyForegroundService.EXTRA_RADIUS, radius);
        serviceIntent.putExtra(MyForegroundService.EXTRA_K, k);

        // Android 8.0 (API level 26) 及更高版本需要使用 startForegroundService
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            startForegroundService(serviceIntent);
        } else {
            startService(serviceIntent);
        }
    }

    private void stopMyService() {
        Intent serviceIntent = new Intent(this, MyForegroundService.class);
        stopService(serviceIntent);
    }
}

import android.app.Service;
import android.content.Intent;
import android.os.IBinder;
import android.util.Log;
import androidx.annotation.Nullable;

public class MyForegroundService extends Service {

    private static final String TAG = "MyForegroundService";

    // Intent extras的键名，与MainActivity中保持一致
    public static final String EXTRA_X1 = "extra_x1";
    public static final String EXTRA_Y1 = "extra_y1";
    public static final String EXTRA_RADIUS = "extra_radius";
    public static final String EXTRA_K = "extra_k";

    private volatile Thread currentWorkerThread; // 保持对当前工作线程的引用
    private volatile boolean isRunning = false; // 控制线程循环的标志

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        // 1. 从Intent中提取最新数据
        double x1 = intent.getDoubleExtra(EXTRA_X1, 0.0);
        double y1 = intent.getDoubleExtra(EXTRA_Y1, 0.0);
        double radius_ = intent.getDoubleExtra(EXTRA_RADIUS, 0.0);
        int k = intent.getIntExtra(EXTRA_K, 0);

        Log.d(TAG, "onStartCommand: 接收到最新数据 x1=" + x1);

        // 2. 停止任何之前正在运行的工作线程
        stopCurrentWorkerThread();

        // 3. 使用最新数据启动一个新的工作线程
        isRunning = true;
        currentWorkerThread = new Thread(new Runnable() {
            @Override