縦横切替で ListView/GridView を切り替える(表示用データは毎回再生成しない)

ConfigChangeTestActivity.java

package test.fragment.configchange;

import android.app.Activity;
import android.app.Fragment;
import android.app.FragmentTransaction;
import android.os.Bundle;

/**
 * 縦横切替で ListView/GridView を切り替えるサンプル
 * (表示用データは毎回再生成しない)
 *
 * @author daichan4649
 */
public class ConfigChangeTestActivity extends Activity {

    private static final String TAG_LIST = "list";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        Fragment fragment = getFragmentManager().findFragmentByTag(TAG_LIST);
        if (fragment == null) {
            fragment = ConfigChangeTestFragment.newInstance();
            FragmentTransaction ft = getFragmentManager().beginTransaction();
            ft.add(android.R.id.content, fragment, TAG_LIST);
            ft.commit();
        }
    }
}

ConfigChangeTestFragment.java

package test.fragment.configchange;

import java.util.ArrayList;
import java.util.List;

import test.fragment.R;
import android.app.Fragment;
import android.content.Context;
import android.content.res.Configuration;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AbsListView;
import android.widget.ArrayAdapter;
import android.widget.Toast;

public class ConfigChangeTestFragment extends Fragment {

    public static ConfigChangeTestFragment newInstance() {
        return new ConfigChangeTestFragment();
    }

    private ArrayAdapter<String> adapter;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        // fragment再生成抑止
        setRetainInstance(true);

        // adapter
        adapter = new ArrayAdapter<String>(getActivity(), R.layout.list_column, R.id.text);
        adapter.addAll(createDataList(100));
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        // toast
        showOrientaionToast(getActivity());

        // list setting
        View parent = inflater.inflate(R.layout.list, container, false);
        AbsListView list = (AbsListView) parent.findViewById(R.id.list);
        list.setAdapter(adapter);
        return parent;
    }

    private static List<String> createDataList(int counts) {
        List<String> list = new ArrayList<String>();
        for (int i = 0; i < counts; i++) {
            list.add("i=" + i);
        }
        return list;
    }

    private static void showOrientaionToast(Context context) {
        String text = (isPortrait(context) ? "portrait" : "landscape");
        Toast.makeText(context, text, Toast.LENGTH_SHORT).show();
    }

    private static boolean isPortrait(Context context) {
        int orientation = context.getResources().getConfiguration().orientation;
        return (orientation == Configuration.ORIENTATION_PORTRAIT);
    }
}

list(landscape).xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <GridView
        android:id="@+id/list"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:numColumns="2" >
    </GridView>

</LinearLayout>

list(portrait).xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <ListView
        android:id="@+id/list"
        android:layout_width="match_parent"
        android:layout_height="match_parent" >
    </ListView>

</LinearLayout>

list_column.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="horizontal" >

    <ImageView
        android:id="@+id/icon"
        android:layout_width="50dip"
        android:layout_height="50dip"
        android:layout_gravity="center"
        android:src="@drawable/ic_launcher"/>

    <TextView
        android:id="@+id/text"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_vertical"
        android:text="text" />

</LinearLayout>