使用onActivityResult调用函数

Intent intent = new Intent(MainActivity.this, SecondActivity.class);
intent.putExtra("key", value);
startActivityForResult(intent, requestCode);

Intent intent = getIntent();
String data = intent.getStringExtra("key");

// 在适当的时候设置返回结果
Intent resultIntent = new Intent();
resultIntent.putExtra("resultKey", resultValue);
setResult(Activity.RESULT_OK, resultIntent);
finish();

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    
    if (requestCode == requestCode) {
        if (resultCode == Activity.RESULT_OK) {
            String result = data.getStringExtra("resultKey");
            // 处理返回结果
        } else if (resultCode == Activity.RESULT_CANCELED) {
            // 处理取消操作
        }
    }
}