从使用 Intent 调用的活动中获取结果 [重复]

Posted 2023-02-22

【中文标题】从使用 Intent 调用的活动中获取结果 [重复]

【英文标题】：Get result from activity called with Intent [duplicate]

【发布时间】：2014-01-10 00:24:33

【问题描述】：

我是安卓开发新手 我现在调用一个意图我如何从调用的活动中获得结果 谁能告诉我如何执行这项任务？ 我称之为意图。

Intent I = new Intent (this ,abc.class); startActivity(i);

谢谢

【问题讨论】：

“我如何从被调用的活动中获得结果”是什么意思？

【参考方案1】：

使用startActivityForResult，然后在您的FirstActivity 中覆盖onActivityResult。

在FirstActivity

Intent intent = new Intent(FirstActivity.this,SecondActivity.class);
startActivityForResult(intent, 2);// Activity is started with requestCode 2  

覆盖onActivityResult

 @Override  
       protected void onActivityResult(int requestCode, int resultCode, Intent data)  
         
                 super.onActivityResult(requestCode, resultCode, data);  

                  // check if the request code is same as what is passed  here it is 2  
                   if(requestCode==2)  
                           
                            String message=data.getStringExtra("MESSAGE");   
                            Log.i("Message is",message);
                            // logs Testing

                           

     

在SecondAcivity

Intent intent=new Intent();  
intent.putExtra("MESSAGE","Testing");  
setResult(2,intent);  
finish();//finishing activity  

参考文档：

http://developer.android.com/reference/android/app/Activity.html#startActivityForResult(android.content.Intent, int)

例子：

http://www.javatpoint.com/android-startactivityforresult-example

【参考方案2】：

要参加第二个活动，请在您的第一堂课中使用 startActivityForResult

Intent callIntent = new Intent(FirstClass.this, SecondClass.class);
startActivityForResult(callIntent, 1);

然后像这样覆盖你的第一个类中的 onActivityResult 方法

protected void onActivityResult(int requestCode, int resultCode, Intent data) 
     // Check which request we're responding to
     if (requestCode == 1) 
         // Make sure the request was successful
         if (resultCode == RESULT_OK) 


            // get values from data
         
      

如果您想发送，请在您的第二堂课中执行此操作以返回 一流的东西。将此存储在您的意图中。

Intent result = new Intent(); setResult(Activity.RESULT_OK, result);
finish();

【参考方案3】：

你可以得到结果调用活动

以startActivityForResult(intent, 0); 开始活动 在调用活动中添加以下方法

 protected void onActivityResult(int requestCode, int resultCode, Intent data) 
    if (requestCode == 0) 
        if (resultCode == RESULT_OK) 

            // do your task 

         else if (resultCode == RESULT_CANCELED) 
            // do your task 
        
    

【参考方案4】：

在你的主类中......

static final int CODE_REQUEST = 1;  // The request code

....

Intent pickContactIntent = new Intent(MainClass.this, CallingClassName.class);
startActivityForResult(pickContactIntent, CODE_REQUEST);

.......

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) 
    // Check which request we're responding to
    if (requestCode == PICK_CONTACT_REQUEST) 
        // Make sure the request was successful
        if (resultCode == RESULT_OK) 
            // The user picked a contact.
            // The Intent's data Uri identifies which contact was selected.

            // Do something with the contact here (bigger example below)
        
    

在你的调用类中

Intent result = new Intent();
setResult(Activity.RESULT_OK, result);
finish()