意向回到旧活动后如何设置edittext值? [英] How to set edittext values after intent back to old activity?

问题描述

我正在使用Android.我在活动A中有一个按钮和EditText.当我单击该按钮时，它会以意图进入活动B.我在Acivity B中有一个ListView.单击列表项，然后将值存储在字符串中，然后再次使用意图返回到活动A.现在，我想在活动A的EditText字段中设置值.可以吗?

I am working with Android. I have a button and EditText in Activity A. When I click on the button it goes to Activity B with an Intent. I have a ListView in Acivity B. I clicked on list item and stored the values in string and again go back to Activity A with an Intent. Now I want to set the values in the EditText field in activity A. Is it possible????

推荐答案

您可以在Intent中的活动之间传递数据.这是在您的情况下构造代码的方式:

You can pass data between activities in Intents. Here's how you might structure the code in your case:

1. 在ActivityA类中创建一个静态变量，该变量将用作请求代码:

1. Create a static variable in your ActivityA class, which will be used as request code:

public class ActivityA extends Activity {

    //declare a static variable here, in your class
    public static final int ACTIVITYB_REQUEST = 100;    

活动A:单击按钮时，创建一个Intent并启动startActivityForResult()

Activity A: when button is clicked, create an Intent and startActivityForResult()

Intent intent = new Intent(this, ActivityB.class);
startActivityForResult(intent, ACTIVITY_REQUEST);

在活动B中:单击某项时，将您的字符串存储在一个意图中，并调用setResult()和finish()，这将带您回到活动A:

In Activity B: when clicked an item, store your string in an intent and call setResult() and finish(), which will take you back to Activity A:

//create an Intent
Intent resultIntent = new Intent();

//add your string from the clicked item
resultIntent.putExtra("string_key", clicked_item_string);

//return data back to parent, which is Activity A
setResult(RESULT_OK, resultIntent);

//finish current activity
finish();

在活动A:覆盖onActivityResult()，检查返回的数据并相应地设置您的EditText

In Activity A: override onActivityResult(), check for returned data and set your EditText accordingly

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

    //check if we are back from Activity B...
    if (requestCode == ACTIVITYB_REQUEST) {
        //and all went fine...
        if (resultCode == RESULT_OK) {
            //if Intent is not null
            if (data != null) {

                //get your string 
                String newString = data.getExtras().getString("string_key");

                //set your EditText
                someEditText.setText(newString);
            }
        }
    }
}

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