从使用 Intent 调用的活动获取结果

Question

我是安卓开发的新手我现在调用一个意图，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？我称意图为喜欢。

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

谢谢

Answer 1

使用 startActivityForResult，然后在 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：

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

Answer 2

要转到第二个活动，请在第一个类中使用 startActivityForResult

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

然后在您的第一堂课中覆盖 onActivityResult 方法，如下所示

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
         }
     } }

在您的第二堂课中，如果您想发送，请这样做以返回头等舱的东西。将其存储在您的意图中。

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

Answer 3

嗨，您可以获得结果调用活动

从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 
        }
    }
}

<</div> div class="one_answers">

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)
        }
    }
}

在您的呼叫类中

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