프래그먼트로 화면 만들기
MainActivity에 버튼을 3개 추가 한 후 Fragment 파일을 추가 해준다.
ListFragment.java
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public static interface ImageSelectionCallback{
public void onImageSelected(int position);
}
public ImageSelectionCallback callback;
@Override
public void onAttach(Context context){
super.onAttach(context);
if(context instanceof ImageSelectionCallback){
callback = (ImageSelectionCallback) context;
}
}
@Nullable
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container,
@Nullable Bundle savedInstanceState){
ViewGroup rootView = (ViewGroup) inflater.inflate(R.layout.fragment_list, container, false);
Button button = rootView.findViewById(R.id.button);
button.setOnClickListener((v)->{
if(callback !=null)
callback.onImageSelected(0);
});
Button button2 = rootView.findViewById(R.id.button2);
button2.setOnClickListener((v)->{
if(callback !=null)
callback.onImageSelected(1);
});
Button button3 = rootView.findViewById(R.id.button3);
button3.setOnClickListener((v)->{
if(callback!=null)
callback.onImageSelected(2);
});
return rootView;
}
ViewerFragment.java
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public class ViewerFragment extends Fragment {
ImageView imageView;
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container,
@Nullable Bundle savedInstanceState){
ViewGroup rootView = (ViewGroup) inflater.inflate(R.layout.fragment_viewer,
container, false);
imageView = rootView.findViewById(R.id.imageView);
return rootView;
}
public void setImage(int resId){
imageView.setImageResource(resId);
}
}
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public class MainActivity extends AppCompatActivity implements ListFragment.ImageSelectionCallback{
ListFragment listFragment;
ViewerFragment viewerFragment;
int images[] = {R.drawable.dream01, R.drawable.dream02, R.drawable.dream03};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
FragmentManager manager= getSupportFragmentManager();
listFragment = (ListFragment) manager.findFragmentById(R.id.listFragment);
viewerFragment = (ViewerFragment) manager.findFragmentById(R.id.viewerFragment);
}
@Override
public void onImageSelected(int position){
viewerFragment.setImage(images[position]);
}
}
activity_main.xml
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<?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"
android:orientation="vertical"
tools:context=".MainActivity" >
<fragment
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:name="org.techtown.fragment.ListFragment"
android:id="@+id/listFragment"
/>
<fragment
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:name="org.techtown.fragment.ViewerFragment"
android:id="@+id/viewerFragment"
/>
</LinearLayout>
