访问单例中的应用程序上下文

Context context = getApplicationContext();

// 通过传递Context对象
public class MySingleton {
    private Context context;

    private static MySingleton instance;

    private MySingleton(Context context) {
        this.context = context;
    }

    public static synchronized MySingleton getInstance(Context context) {
        if (instance == null) {
            instance = new MySingleton(context.getApplicationContext());
        }
        return instance;
    }

    // 其他方法...
}

// 使用Application类的静态方法
public class MyApplication extends Application {
    private static MyApplication instance;

    public static synchronized MyApplication getInstance() {
        return instance;
    }

    @Override
    public void onCreate() {
        super.onCreate();
        instance = this;
    }

    // 其他方法...
}