最近の流行りな「引っ張って更新」。

ライブラリはこれを使ってみた。
chrisbanes/ActionBar-PullToRefresh

よくありそうな Activity + ListView の場合でざっくり流れをつかむ。

 

0. implements する

public class ListViewWithEmptyActivity extends Activity
        implements PullToRefreshAttacher.OnRefreshListener {

    private PullToRefreshAttacher mPullToRefreshAttacher;
    ...

 

1. Attacher を取得

mPullToRefreshAttacher = PullToRefreshAttacher.get(this);

 

2. Layout にセット

PullToRefreshLayout ptrLayout = (PullToRefreshLayout) findViewById(R.id.ptr_layout);
ptrLayout.setPullToRefreshAttacher(mPullToRefreshAttacher, this);

 

3. 更新開始処理

@Override
public void onRefreshStarted(View view) {
    ...

 

4. 更新完了処理

mPullToRefreshAttacher.setRefreshComplete();

 

便利。簡単に実装できる。

ざっくりのまま、まとめる。

 

まとめ

Activity + ListView の場合

// 0. implements する
public class ListViewWithEmptyActivity extends Activity
        implements PullToRefreshAttacher.OnRefreshListener {

    ...

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

        ...

        // 1. Attacher を取得
        mPullToRefreshAttacher = PullToRefreshAttacher.get(this);

        // 2. Layout にセット
        PullToRefreshLayout ptrLayout = 
              (PullToRefreshLayout) findViewById(R.id.ptr_layout);
        ptrLayout.setPullToRefreshAttacher(mPullToRefreshAttacher, this);
    }

    // 3. 更新処理
    @Override
    public void onRefreshStarted(View view) {

        new AsyncTask<Void, Void, Void>() {

            @Override
            protected Void doInBackground(Void... params) {
                try {

                    ....

                } catch (InterruptedException e) {

                }
                return null;
            }

            @Override
            protected void onPostExecute(Void result) {
                super.onPostExecute(result);

                ...

                // 4. 更新完了処理
                mPullToRefreshAttacher.setRefreshComplete();
            }
        }.execute();
    }
}

これが、Fragment + ActionBar(Tabs) + Pager になると

public class FragmentTabsActivity extends ActionBarActivity implements ActionBar.TabListener {

    private PullToRefreshAttacher mPullToRefreshAttacher;

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

        setContentView(R.layout.activity_fragment);

        // The attacher should always be created in the Activity's onCreate
        mPullToRefreshAttacher = PullToRefreshAttacher.get(this);

　　　　　...
    }

    ...

    PullToRefreshAttacher getPullToRefreshAttacher() {
        return mPullToRefreshAttacher;
    }


    public static class SampleFragment extends Fragment implements
            PullToRefreshAttacher.OnRefreshListener {

        private PullToRefreshAttacher mPullToRefreshAttacher;

        @Override
        public View onCreateView(LayoutInflater inflater,
　　　　　　　　ViewGroup container,　Bundle savedInstanceState) {

            ...

            mPullToRefreshAttacher = ((FragmentTabsActivity) getActivity())
                    .getPullToRefreshAttacher();

            mPullToRefreshAttacher.addRefreshableView(scrollView, this);

            ...

            return view;
        }

        @Override
        public void onRefreshStarted(View view) {

            new AsyncTask<Void, Void, Void>() {

                @Override
                protected Void doInBackground(Void... params) {
                    try {
                        ...
                    } catch (InterruptedException e) {
                        ...
                    }
                    return null;
                }

                @Override
                protected void onPostExecute(Void result) {
                    super.onPostExecute(result);

                    mPullToRefreshAttacher.setRefreshComplete();
                }
            }.execute();
        }
    }
}

 

これとは別に微妙に違うこんなライブラリもある。

chrisbanes/Android-PullToRefresh
https://github.com/chrisbanes/Android-PullToRefresh

関連ワード:  Android・AndroidStudio・ライブラリ・開発・Pull to refresh・引っ張って更新