[Android] intent를 이용하여 컴포넌트 이동하기 - java

 

Intent를 이용하여 다른 컴포넌트로 이동할 수 있고,

putExtra와 getExtra에 키값을 주어 데이터를 전달 할 수 있다.

 

 

MainActivity

package com.example.firstapp;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;

public class MainActivity extends AppCompatActivity {
    EditText et_id;
    Button btn_test;

    private EditText et_test;
    private Button btn_move;
    private String str;

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

        btn_move = findViewById(R.id.btn_move);
        btn_move.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent intent = new Intent(MainActivity.this, SubActivity.class);
                str = et_test.getText().toString();
                intent.putExtra("str", str);
                startActivity(intent);
            }
        });

        et_id = findViewById(R.id.et_id);
        btn_test = findViewById(R.id.btn_test);

        btn_test.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                et_id.setText("LMJ");
            }
        });
    }
}

 

 

 

 

 

SubActivity

package com.example.firstapp;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;
import android.widget.TextView;

public class SubActivity extends AppCompatActivity {

    private TextView tv_sub;

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

        tv_sub = findViewById(R.id.tv_sub);

        Intent intent = getIntent();
        String str = intent.getStringExtra("str");

        tv_sub.setText(str);
    }
}