Question

我是Android开发的新手我现在调用一个意图如何从被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

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）

示例：

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

Answer 2

嗨，您可以获得结果通话活动

使用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 
        }
    }

}

Answer 3

在你的主要班级......

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)
        }
    }
}

在您的通话类中

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

Answer 4

要进入第二个活动，请先使用startActivityForResult       类

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

然后覆盖你的第一个类中的onActivityResult方法，就像这样


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
    }
} }
在你的第二堂课中，如果你想发送，请回来     一流的东西。将此存储在您的意图中。

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

从使用Intent调用的活动中获取结果

4 个答案: