동적레이아웃(DynamicLayout) - width, height

동적레이아웃(DynamicLayout)

width, height

ㆍ LayoutParams

ㆍ setLayoutParams

ㆍ MATCH_PARENT

ㆍ WRAP_CONTENT

이번글에서 첫번째로

만들어볼 화면 4가지

첫번째 화면

width = WRAP_CONTENT

height = WRAP_CONTENT

두번째 화면

width = MATCH_PARENT

height = WRAP_CONTENT

세번째 화면

width = WRAP_CONTENT

height = MATCH_PARENT

네번째 화면

width = MATCH_PARENT

height = MATCH_PARENT

코드작성

1. 기본적인 전체 레이아웃 LinearLayout 생성

2. LinearLayout에 들어갈 Button 생성

3. Button에 HELLO WORLD! 텍스트 넣기

4. LinearLayout의 width, height값을 MATCH_PARENT 적용

5. Button의 width, height을 변경해보면서 4가지 화면 구현

1. 기본적인 전체 레이아웃 LinearLayout 생성

public class MainActivity extends AppCompatActivity
{
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        //setContentView(R.layout.activity_main);

        LinearLayout ll = new LinearLayout(this);
        setContentView(ll);

    }
}

2. LinearLayout에 들어갈 Button 생성

public class MainActivity extends AppCompatActivity
{
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        //setContentView(R.layout.activity_main);

        LinearLayout ll = new LinearLayout(this);
        Button btn = new Button(this);

        ll.addView(btn);
        setContentView(ll);
    }
}

3. Button에 HELLO WORLD! 텍스트 넣기

public class MainActivity extends AppCompatActivity
{
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        //setContentView(R.layout.activity_main);

        LinearLayout ll = new LinearLayout(this);
        Button btn = new Button(this);
        btn.setText("HELLO WORLD!");

        ll.addView(btn);
        setContentView(ll);
    }
}

4. LinearLayout의 width, height값을 MATCH_PARENT 적용

LayoutParams

: 레이아웃을 동적으로 생성할때

width, height, margin, padding등의

초기값을 설정해 줄 수 있다

setLayoutParams

: 설정한 초기값을 해당 View에

적용시킬 수 있다.

public class MainActivity extends AppCompatActivity
{
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        //setContentView(R.layout.activity_main);

        LinearLayout ll = new LinearLayout(this);
        LinearLayout.LayoutParams param = new LinearLayout.LayoutParams
                                            (LinearLayout.LayoutParams.MATCH_PARENT,
                                            LinearLayout.LayoutParams.MATCH_PARENT);
        ll.setLayoutParams(param);

        Button btn = new Button(this);
        btn.setText("HELLO WORLD!");

        ll.addView(btn);
        setContentView(ll);
    }
}

5. Button의 width, height을 변경해보면서 4가지 화면 구현

첫번째 화면

width = WRAP_CONTENT

height = WRAP_CONTENT

public class MainActivity extends AppCompatActivity
{
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        //setContentView(R.layout.activity_main);

        LinearLayout ll = new LinearLayout(this);
        LinearLayout.LayoutParams param = new LinearLayout.LayoutParams
                                            (LinearLayout.LayoutParams.MATCH_PARENT,
                                             LinearLayout.LayoutParams.MATCH_PARENT);
        ll.setLayoutParams(param);

        Button btn = new Button(this);
        ViewGroup.LayoutParams lp = new ViewGroup.LayoutParams
                                        (ViewGroup.LayoutParams.WRAP_CONTENT,
                                         ViewGroup.LayoutParams.WRAP_CONTENT);
        btn.setLayoutParams(lp);
        btn.setText("HELLO WORLD!");

        ll.addView(btn);
        setContentView(ll);
    }
}

두번째 화면

width = MATCH_PARENT

height = WRAP_CONTENT

(공통코드 생략)

ViewGroup.LayoutParams lp = new ViewGroup.LayoutParams
                                (ViewGroup.LayoutParams.MATCH_PARENT,
                                 ViewGroup.LayoutParams.WRAP_CONTENT);

세번째 화면

width = MATCH_PARENT

height = WRAP_CONTENT

ViewGroup.LayoutParams lp = new ViewGroup.LayoutParams
                                (ViewGroup.LayoutParams.WRAP_CONTENT,
                                 ViewGroup.LayoutParams.MATCH_PARENT);

네번째 화면

width = MATCH_PARENT

height = MATCH_PARENT

ViewGroup.LayoutParams lp = new ViewGroup.LayoutParams
                                (ViewGroup.LayoutParams.MATCH_PARENT,
                                 ViewGroup.LayoutParams.MATCH_PARENT);

---

이번글에서

두번째로

만들어볼 화면

버튼의 크기를

정해서 생성하기

ViewGroup.LayoutParams lp = new ViewGroup.LayoutParams(원하는 width, 원하는 height);

public class MainActivity extends AppCompatActivity
{
    Button btn;
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        //setContentView(R.layout.activity_main);

        LinearLayout ll = new LinearLayout(this);
        LinearLayout.LayoutParams param = new LinearLayout.LayoutParams
                                            (LinearLayout.LayoutParams.MATCH_PARENT,
                                             LinearLayout.LayoutParams.MATCH_PARENT);
        ll.setLayoutParams(param);

        btn = new Button(this);
        ViewGroup.LayoutParams lp = new ViewGroup.LayoutParams(200,200);
        
        btn.setLayoutParams(lp);
        btn.setText("HELLO WORLD!");

        ll.addView(btn);
        setContentView(ll);
    }
}

Toast를 찍기 위해서는?

Toast.makeText(this,"width : "+btn.getWidth()+"\n"+"height : "+btn.getHeight(),Toast.LENGTH_LONG).show();

어디다가 작성?

setContentView(ll);

아래?

NO NO!!

왜 아래에 쓰면 안되는가?

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최종코드

public class MainActivity extends AppCompatActivity
{
    Button btn;
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        //setContentView(R.layout.activity_main);

        LinearLayout ll = new LinearLayout(this);
        LinearLayout.LayoutParams param = new LinearLayout.LayoutParams
                                            (LinearLayout.LayoutParams.MATCH_PARENT,
                                             LinearLayout.LayoutParams.MATCH_PARENT);
        ll.setLayoutParams(param);

        btn = new Button(this);
        ViewGroup.LayoutParams lp = new ViewGroup.LayoutParams(200,200);

        btn.setLayoutParams(lp);
        btn.setText("HELLO WORLD!");

        ll.addView(btn);
        setContentView(ll);
    }
    @Override
    public void onWindowFocusChanged(boolean hasFocus)
    {
        Toast.makeText(this,"width : "+btn.getWidth()+"\n"+"height : "+btn.getHeight(),Toast.LENGTH_LONG).show();
        super.onWindowFocusChanged(hasFocus);
    }
}