onClickListener implements로 구현하기

onClickListener implements로 구현하기

Anonymous class 이용해서 구현하기

public class MainActivity extends AppCompatActivity {
​
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
​
        Button btn1 = findViewById(R.id.button1);
        btn1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Toast.makeText(getApplicationContext(),"AAAAAAAAAAAAAAAAAAAAAAAAA", Toast.LENGTH_SHORT).show();
            }
        });
​
        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);
            }
        });
    }

Implements 이용해서 구현하기

public class MainActivity extends AppCompatActivity implements View.OnClickListener{
​
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
​
        Button btn1 = findViewById(R.id.button1);
        btn1.setOnClickListener(MainActivity.this);
​
        Button btn2 = findViewById(R.id.button2);
        btn2.setOnClickListener(MainActivity.this);
    }
​
    @Override
    public void onClick(View view) {
​
        switch(view.getId()){
            case R.id.button1:
                Toast.makeText(getApplicationContext(),"AAAAAAAAAAAAAAAAAAAAAAAAA", Toast.LENGTH_SHORT).show();
                break;
            case R.id.button2:
                Intent myintent = new Intent(MainActivity.this, Main2Activity.class);
                myintent.putExtra("QWER", "HI Hello oooooolll~~~!");
                startActivity(myintent);
                break;
        }
    }
}