在键入时更新用户输入

Question

此问题与使用电子邮件意图的基本应用有关。

应用程序的UI显示4个输入：

1. 电子邮件地址
2. 主题
3. 名称
4. 消息
5. 按钮

消息属于textMultiLine输入类型。

该邮件的默认文字为："Hello CustomerName (This is a dynamic variable that would update as the user types their name in input number 3), could you please review our app..."

我要做的是将CustomerName实时更新为实际客户名称，因为他们在输入数字3（姓名）中输入了该名称。

来源：

package com.example.apit.testemailintent;

import android.content.Intent;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Button;
import android.widget.EditText;

public class MainActivity extends AppCompatActivity {

    EditText receiver, sub, mesg;
    EditText customerName;
    Button btn;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        receiver = (EditText) findViewById(R.id.email);
        sub = (EditText) findViewById(R.id.subject);
        customerName = (EditText) findViewById(R.id.name);
        mesg = (EditText) findViewById(R.id.message);
        btn = (Button) findViewById(R.id.submitButton);

        addListenerOnButton1();

    }

    public void addListenerOnButton1() {
        btn.setOnClickListener(new View.OnClickListener() {


            @Override
            public void onClick(View view) {

                String Sendto = receiver.getText().toString();
                String subject = sub.getText().toString();
                String cusName = customerName.getText().toString();
                String mesgs = "Hello " + cusName + ", could you please review our app...?";


                Intent email = new Intent(Intent.ACTION_SEND);
                email.putExtra(Intent.EXTRA_EMAIL, new String[]{Sendto});
                email.putExtra(Intent.EXTRA_SUBJECT, subject);
                email.putExtra(Intent.EXTRA_TEXT, mesgs);

                email.setType("message/rfc822");
                startActivity(Intent.createChooser(email, "Please Choose an Email Client"));

            }
        });

    }

}

谢谢，

Answer 1

nameEditText.addTextChangedListener(new TextWatcher() {

   @Override
   public void afterTextChanged(Editable s) {}

   @Override
   public void beforeTextChanged(CharSequence s, int start,
     int count, int after) {
   }

   @Override
   public void onTextChanged(CharSequence s, int start,int before, int count) {
      messageEditText.setText("Hello " + s + " could you please review our app")
   }
  });