从活动B到活动A的额外内容 [英] Extra from Activity B to Activity A

问题描述

我有两个活动.在活动A中，我有 Textview .单击此按钮后，我使用 EditText 进入活动B.

I have two activities. In Activity A I have Textview. After click this I go to Activity B with EditText.

如何将值从活动B中的 EditText 传递回活动A中的 TextView ，从而使活动A保持原始状态?

How can I pass the value from the EditText in activity B back to the TextView in activity A, keeping activity A's original state in the process?

推荐答案

写活动A像这样

public class MainActivity extends Activity {  
TextView textView1;  
Button button1;  
@Override  
protected void onCreate(Bundle savedInstanceState) {  
    super.onCreate(savedInstanceState);  
    setContentView(R.layout.activity_main);  
    textView1=(TextView)findViewById(R.id.textView1);  
    button1=(Button)findViewById(R.id.button1);  
    button1.setOnClickListener(new OnClickListener() {  
        @Override  
        public void onClick(View arg0) {  
            Intent intent=new Intent(MainActivity.this,SecondActivity.class);  
            startActivityForResult(intent, 2);// Activity is started with requestCode 2  
        }  
    });  
}  
// Call Back method  to get the Message form other Activity  
@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");   
                        textView1.setText(message);  
                     }  
 }  
 }

使用startActivity插入 startActivityForResult

Insted of startActivity use startActivityForResult

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

在活动B中设置这样的结果

and in Activity B set result like this

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

您可以在活动A( onActivityResult )

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