Java Android Studio异步任务结果函数

我有一个类

SysCall

extends

AsyncTask

建造商：

public SysCall(Context context,String [] attr,String [] value,String req_page)

呼叫时使用：

String str_result= new SysCall(this,attr,value,"test.php").execute().get();

然后我开始分析字符串

stru result

，但等待它并不好，它会冻结UI。

---

如果我的活动类中有一个方法，我喜欢在它完成工作时使用它，它可以访问所有的类变量，那么我该怎么做呢？

我从您的问题中了解到，您想在

asyncTask

完成后台工作后调用

活动中的一个方法：

class MainActivity extends .........{
......
......
......

//when you start the asyncTask:

new SysCall(this,attr,value,"test.php",this).execute();


//lets say you have a method called, callActivityMethod

public void callActivityMethod(){

 ....................

}



}

SysCall extends AsyncTask,,,,,,,,,,,,

...................
private MainActivity activity;


public SysCall(Context context,String [] attr,String [] value,String req_page, MainActivity activity){

...........
this.activity = activity;


}


//call the method from here
@Override
protected void onPostExecute(........) {
//this is called after your task is finished

//call the activity method
activity.callActivityMethod();
}

为此，必须将活动传递给asyncTask的构造函数：

class MainActivity extends .........{
......
......
......

//when you start the asyncTask:

new SysCall(this,attr,value,"test.php",this).execute();


//lets say you have a method called, callActivityMethod

public void callActivityMethod(){

 ....................

}



}

SysCall extends AsyncTask,,,,,,,,,,,,

...................
private MainActivity activity;


public SysCall(Context context,String [] attr,String [] value,String req_page, MainActivity activity){

...........
this.activity = activity;


}


//call the method from here
@Override
protected void onPostExecute(........) {
//this is called after your task is finished

//call the activity method
activity.callActivityMethod();
}

假设您的
活动
被称为
main活动
（可以是任何其他名称）：

class MainActivity extends .........{
......
......
......

//when you start the asyncTask:

new SysCall(this,attr,value,"test.php",this).execute();


//lets say you have a method called, callActivityMethod

public void callActivityMethod(){

 ....................

}



}

SysCall extends AsyncTask,,,,,,,,,,,,

...................
private MainActivity activity;


public SysCall(Context context,String [] attr,String [] value,String req_page, MainActivity activity){

...........
this.activity = activity;


}


//call the method from here
@Override
protected void onPostExecute(........) {
//this is called after your task is finished

//call the activity method
activity.callActivityMethod();
}

在异步任务中，传递
MainActivity
引用：

class MainActivity extends .........{
......
......
......

//when you start the asyncTask:

new SysCall(this,attr,value,"test.php",this).execute();


//lets say you have a method called, callActivityMethod

public void callActivityMethod(){

 ....................

}



}

SysCall extends AsyncTask,,,,,,,,,,,,

...................
private MainActivity activity;


public SysCall(Context context,String [] attr,String [] value,String req_page, MainActivity activity){

...........
this.activity = activity;


}


//call the method from here
@Override
protected void onPostExecute(........) {
//this is called after your task is finished

//call the activity method
activity.callActivityMethod();
}

这很有帮助，但是如果我必须在不同的类中调用它，那么我应该在每个类中创建相同的方法名称呢？不同的类是什么意思？或者我也可以使用
Interface
？只需在
activity2.java
中创建另一个asynctask，并按照我告诉您的做同样的事情，或者您可以使用Interface。但这超出了问题的范围。如果我的回答有帮助，那么你就有了解决办法。问一个新问题，而不是你的问题。如果答案解决了你的特定问题，那么接受答案，让别人知道。祝你好运。