[Java] DataBinding + LiveData

build.gradle (Module: app)

android {
	dataBinding {
    	enabled = true
    }
}

 

 

 

 

 

 

 

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<layout>
    <data>
        <variable
            name="mainActivity"
            type="com.jwsoft.javaproject.MainActivity" />
    </data>

    <LinearLayout
        xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:tools="http://schemas.android.com/tools"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical"
        android:gravity="center"
        android:background="#FFBB11"
        tools:context=".MainActivity">

        <TextView
            android:id="@+id/tvName"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@{mainActivity.liveName}"
            android:hint="James Kim"
            android:textSize="30dp"
            android:textStyle="bold" />

        <Button
            android:id="@+id/btnLong"
            android:layout_width="250dp"
            android:layout_height="wrap_content"
            android:text="혀가 긴 개발자"
            android:textSize="20dp"
            android:textStyle="bold"
            android:layout_marginTop="30dp"/>

        <Button
            android:id="@+id/btnShort"
            android:layout_width="250dp"
            android:layout_height="wrap_content"
            android:text="혀가 길지 않은 개발자"
            android:textSize="20dp"
            android:textStyle="bold" />

    </LinearLayout>

</layout>

activity_main.xml

 

 

 

 

 

 

 

MainActivity.java

package com.jwsoft.javaproject;

import androidx.appcompat.app.AppCompatActivity;
import androidx.databinding.DataBindingUtil;
import androidx.lifecycle.MutableLiveData;

import android.os.Bundle;
import android.view.View;

import com.jwsoft.javaproject.databinding.ActivityMainBinding;

public class MainActivity extends AppCompatActivity {

    private ActivityMainBinding binding;
    public MutableLiveData<String> liveName = new MutableLiveData<>();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        binding = DataBindingUtil.setContentView(this, R.layout.activity_main);
        binding.setMainActivity(this);
        binding.setLifecycleOwner(this);

        binding.btnLong.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                liveName.setValue("혀가 긴 개발자");
            }
        });

        binding.btnShort.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                liveName.setValue("혀가 길지 않은 개발자");
            }
        });

    }
}

실행 결과