Android 将参数传递给 TimerTask 扩展类

Posted 2023-04-14

【中文标题】Android 将参数传递给 TimerTask 扩展类

【英文标题】：Android pass parameters to TimerTask extends class

【发布时间】：2014-11-14 18:34:54

【问题描述】：

在我的应用程序中，我需要将参数传递给 TimerTask 以供使用 Context。但我做不到。在下面的代码中GetSMSThread 类是subclass，需要从主类获取参数。

Timer smsThread = new Timer();
GetSMSThread getSMSThread = new GetSMSThread();
smsThread.scheduleAtFixedRate(getSMSThread, 0, 100000);

GetSMSThread子类：

public class GetSMSThread extends TimerTask 
    @Override
    public void run() 

    

【问题讨论】：

你可以在 MainClass 中声明你的 TimerTask 类本身

【参考方案1】：

有两种方法可以解决您的问题

在MainClass 中声明您的GetSMSThread 自己，因此无需在Constructor 中发送参数

另一种方式是在Constructors中发送参数

选项 1：

public class MainClass extends Activity 

    private String myString = "";

    @Override
    public void onCreate(Bundle savedInstanceState) 
        super.onCreate(savedInstanceState);
        // .... your code
        Timer smsThread = new Timer();
        GetSMSThread getSMSThread = new GetSMSThread();
        smsThread.scheduleAtFixedRate(getSMSThread, 0, 100000);
        myString = "assigning some value";
    

    public class GetSMSThread extends TimerTask 

        @Override
        public void run() 
            myString = "manipulating Values";
        
    

选项 2：

public class MainClass extends Activity 

    private String myString = "";

    @Override
    public void onCreate(Bundle savedInstanceState) 
        super.onCreate(savedInstanceState);
        // .... your code
        myString = "assigning some value";
        Timer smsThread = new Timer();
        GetSMSThread getSMSThread = new GetSMSThread(myString);
        smsThread.scheduleAtFixedRate(getSMSThread, 0, 100000);
    

GetSMSThread：

public class GetSMSThread extends TimerTask 

    private String myString = "";

    public GetSMSThread(String mString) 
        myString = mString;
    

    @Override
    public void run() 
        myString = "manipulating Values";
    

【参考方案2】：

    Timer smsThread = new Timer();
    GetSMSThread getSMSThread = new GetSMSThread("data");
    smsThread.scheduleAtFixedRate(getSMSThread, 0, 100000);
    GetSMSThread subClass:

    public class GetSMSThread extends TimerTask 

     String data;
    GetSMSThread(String data)

     this.data = data;

    
        @Override
        public void run() 
              //use data here
        
    

【参考方案3】：

您可以通过构造函数将上下文对象传递给类。

public class GetSMSThread extends TimerTask 
Context context;
public GetSMSThread (Context context)
    this.context = context;

@Override
public void run() 
   //make sure you dont use the context in a background thread

您可以实例化 **GetSMSThread ** 类并向其传递有效的上下文：

GetSMSThread  myThread = new GetSMSThread(myContext);
//start your timer