Question

i have two activities main Activity and activity two , basically i am trying to pass a text from activity two to main activity when i click the button in main activity but its always retrieve null
any help why it doesn't send back the message

that is main activity code :

 protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Button two = (Button) findViewById(R.id.button);
        Recieve =(TextView) findViewById(R.id.textView2);
        two.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                sendMessage();
            }

        });
    }

    public void sendMessage() {
        Intent intent = new Intent(this, Activity2.class);

        startActivityForResult(intent, REQUEST_CODE);
    }

    protected void onActivityResult(int requestCode, int resultCode, Intent data) {


        super.onActivityResult(requestCode, resultCode, data);

        if (requestCode == REQUEST_CODE && resultCode == RESULT_OK) {

            String requiredValue = data.getStringExtra("Key");
            Recieve.setText(requiredValue);

        }
    }

And that is Activity2 code :

 protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_2);
        send();

    }
    public void send(){
        String message ="hello";
        Intent intent = new Intent();
        intent.putExtra("key", message);
        setResult(RESULT_OK, intent);
        finish();
    }
}

Answer 1

在send()中，您使用"key"小写k。

在onActivityResult()中，您使用"Key"，资本为K。

这些不匹配，这就是为什么你没有得到你的答复。

也许您应该在一个地方定义您的密钥，作为常量（final static），并在两个活动中使用相同的常量定义。

passing data from a child activity to main activity

1 个答案: