[안드로이드 복습]프래그먼트

매인xml

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

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Hello World!"
         />
    <FrameLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/container">
        <fragment
            android:layout_width="match_parent"
            android:layout_height="100dp"
            android:id="@+id/color_fragment"
            android:name="com.example.tryfragment2.ColorFragment"
            />

    </FrameLayout>
    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="교체"
        android:onClick="change"/>

</LinearLayout>

매인 액티비티

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        FragmentManager fragmentManager = getSupportFragmentManager();
        ColorFragment colorFragment = (ColorFragment) fragmentManager.findFragmentById(R.id.color_fragment);//연결

        colorFragment.setColor(Color.GREEN);

    }

    public void change(View view) {
        ColorFragment fragment =new ColorFragment();//교체버튼 클릭시 처리
        int red = new Random().nextInt(256);//랜덤인수 설정
        int blue = new Random().nextInt(256);
        int green = new Random().nextInt(256);

        getSupportFragmentManager().beginTransaction().replace(R.id.container,fragment).commit();
    }
}

fragment_color.xml

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".ColorFragment">

    <!-- TODO: Update blank fragment layout -->
    <TextView
        android:id="@+id/hello_text"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:text="@string/hello_blank_fragment" />

</FrameLayout>

colorfragment.java

public class ColorFragment extends Fragment {
    private TextView mHelloTextView;
    private int mColor = Color.BLUE;


    public ColorFragment() {//기본 빈 생성자 필수, 오버로드 금지 (번들만 가능)
        // Required empty public constructor
    }


    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        View view = inflater.inflate(R.layout.fragment_color, container, false);
        mHelloTextView= view.findViewById(R.id.hello_text);//textview연결
        mHelloTextView.setBackgroundColor(mColor);

        return view;
    }

    public void setColor(int Color){
        mColor=Color;
        if(mHelloTextView != null){
            mHelloTextView.setBackgroundColor(mColor);
        }




    }

}