Day92

public class MainActivity extends Activity {
   private Button btn1;
   private Button btn2;
   private Button btn3;
   private LinearLayout form;
   
   @Override
   protected void onCreate(Bundle savedInstanceState) {
      // TODO Auto-generated method stub
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);
      btn1 = (Button) findViewById(R.id.main_btn1);
      btn2 = (Button) findViewById(R.id.main_btn2);
      btn3 = (Button) findViewById(R.id.main_btn3);
      form = (LinearLayout) findViewById(R.id.main_form);
      btn1.setOnClickListener(new View.OnClickListener() {
        
        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            Fragment f = new FirstFragment();
            FragmentManager fm = getFragmentManager();
            fm.beginTransaction().add(R.id.main_form, f).commit();
        }
    });
   }
   
}

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="kr.mulcam.hui.p0728"
    android:versionCode="1"
    android:versionName="1.0" >
 
    <uses-sdk
        android:minSdkVersion="14"
        android:targetSdkVersion="19" />
 
    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name=".MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>
 
</manifest>

<LinearLayout 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"
   android:orientation="vertical">
    <LinearLayout 
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        >
        <Button 
            android:id="@+id/main_btn1"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="버튼1"
            />
        <Button 
            android:id="@+id/main_btn2"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="버튼2"
            />
        <Button 
            android:id="@+id/main_btn3"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="버튼3"
            />
    </LinearLayout>
        <LinearLayout 
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        android:id="@+id/main_form"
        >
        </LinearLayout>
</LinearLayout>

@SuppressLint("NewApi")
public class FirstFragment extends Fragment{
    private Button btn;
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        // TODO Auto-generated method stub
//        return super.onCreateView(inflater, container, savedInstanceState);
        
        View view = (View) inflater.inflate(R.layout.fragment_first, 
                container,false); // true면 바로 받는거 false면 지정만 해두는거
        //프레그먼트에서 우리가 직접박는게 아니고박을 준비만 해두면 프레그먼트가 적당한 상황에 addView해줄거임
        btn = (Button) view.findViewById(R.id.first_btn);
        btn.setOnClickListener(new View.OnClickListener() {
            
            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                Toast.makeText(getActivity(), "버튼눌림", 0).show();
            }
        });
        return view;
    }
    
 
}