안드로이드 공유 버튼 - 어플 리스트 호출

public class MainActivity extends AppCompatActivity {

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

        Button btn = (Button) findViewById(R.id.button);
        btn.setOnClickListener(new Button.OnClickListener() {
            public void onClick(View v) {
                Intent msg = new Intent(Intent.ACTION_SEND);
                msg.addCategory(Intent.CATEGORY_DEFAULT);
                msg.putExtra(Intent.EXTRA_SUBJECT, "주제");
                msg.putExtra(Intent.EXTRA_TEXT, "내용");
                msg.putExtra(Intent.EXTRA_TITLE, "제목");
                msg.setType("text/plain");
                startActivity(Intent.createChooser(msg, "공유"));

            }
        });
    }
}