Intent로 Activity 간 데이터 교환

Intent로 Activity 간 데이터 교환

MainActivity

public class MainActivity extends AppCompatActivity implements View.OnClickListener{
​
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
​
        Button btn2 = findViewById(R.id.button2);
        btn2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent myintent = new Intent(MainActivity.this, Main2Activity.class);
                myintent.putExtra("QWER", "HI Hello oooooolll~~~!");
                startActivity(myintent);
            }
        });
    }

Main2Activity

public class Main2Activity extends AppCompatActivity {
​
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main2);
​
        Intent myIntent = getIntent();
        String str = myIntent.getExtras().getString("QWER");
        Toast.makeText(this, str, Toast.LENGTH_SHORT).show();
    }
}