java - 当用户输入时更新他们的输入

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此问题与利用电子邮件 Intent 的基本应用程序有关。

应用程序的 UI 显示 4 个输入:

1. 电子邮件地址
2. 主题
3. 姓名
4. 消息
5. 按钮

该消息是 textMultiLine输入类型。

该消息的默认文本为:"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..."

我想做的是实时更新CustomerName在输入号码 3 中输入实际客户名称(姓名)。

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")
   }
  });