Android studio 使用Service生成随机数

您可以使用以下代码在 Android Studio 中创建一个 Service，该 Service 会生成一个随机数并将其返回：

public class RandomNumberService extends Service {
    private final IBinder mBinder = new RandomNumberBinder();
    private final Random mGenerator = new Random();

    public class RandomNumberBinder extends Binder {
        RandomNumberService getService() {
            return RandomNumberService.this;
        }
    }

    @Override
    public IBinder onBind(Intent intent) {
        return mBinder;
    }

    public int getRandomNumber() {
        return mGenerator.nextInt();
    }
}

在您的 Activity 中，您可以使用以下代码来绑定 Service 并获取随机数：

private boolean mBound = false;
private RandomNumberService mService;

private ServiceConnection mConnection = new ServiceConnection() {
    @Override
    public void onServiceConnected(ComponentName className, IBinder service) {
        RandomNumberBinder binder = (RandomNumberBinder) service;
        mService = binder.getService();
        mBound = true;
    }

    @Override
    public void onServiceDisconnected(ComponentName arg0) {
        mBound = false;
    }
};

@Override
protected void onStart() {
    super.onStart();
    Intent intent = new Intent(this, RandomNumberService.class);
    bindService(intent, mConnection, Context.BIND_AUTO_CREATE);
}

@Override
protected void onStop() {
    super.onStop();
    if (mBound) {
        unbindService(mConnection);
        mBound = false;
    }
}

public void generateRandomNumber() {
    if (mBound) {
        int randomNumber = mService.getRandomNumber();
        // 在此处使用生成的随机数
    }
}

请注意，您需要在 AndroidManifest.xml 文件中声明您的 Service，如下所示：

<service android:name=".RandomNumberService" />