클릭이벤트를 처리하는 3가지 방법

onClick 이벤트 처리

activity_a.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent">

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/load_pic_url_btn"
        android:onClick="onClick"/>

</LinearLayout>

ActivityA.java

public class ActivityA extends Activity {

    private String mSendPicUrl = "/data/pics";

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

        Button loadPicUrlBtn = (Button) findViewById(R.id.load_pic_url_btn);
        String loadUrlStr = "사진 불러오기 : " + mSendPicUrl;
        loadPicUrlBtn.setText(loadUrlStr);
    }

    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.load_pic_url_btn: {
                Intent intent = new Intent();
                intent.setClass(this, ActivityB.class);
                intent.putExtra("PIC_URL", mSendPicUrl);
                startActivityForResult(intent, 0);
            }
        }
    }
}