PullToRefresh下拉和上拉简单实现

<com.handmark.pulltorefresh.library.PullToRefreshListView
    android:id="@+id/pull_refresh_list"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:cacheColorHint="#00000000"
    android:divider="#19000000"
    android:dividerHeight="4dp"
    android:fadingEdge="none"
    android:fastScrollEnabled="false"
    android:footerDividersEnabled="false"
    android:headerDividersEnabled="false"
    android:smoothScrollbar="true" />

public final class PullToRefreshListActivity extends AppCompatActivity {

    private LinkedList<String> mListItems;
    private PullToRefreshListView mPullRefreshListView;
    private ArrayAdapter<String> mAdapter;
    private String[] mStrings = {"Abbaye de Belloc", "Abbaye du Mont des Cats", "Abertam", "Abondance", "Ackawi",
            "Acorn", "Adelost", "Affidelice au Chablis", "Afuega'l Pitu", "Airag", "Airedale", "Aisy Cendre",
            "Allgauer Emmentaler", "Abbaye de Belloc", "Abbaye du Mont des Cats", "Abertam", "Abondance", "Ackawi",
            "Acorn", "Adelost", "Affidelice au Chablis", "Afuega'l Pitu", "Airag", "Airedale", "Aisy Cendre",
            "Allgauer Emmentaler"};

    /**
     * Called when the activity is first created.
     */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_ptr_list);

        mPullRefreshListView = (PullToRefreshListView) findViewById(R.id.pull_refresh_list);
        //设置可以上拉加载更多;
        mPullRefreshListView.setMode(PullToRefreshBase.Mode.BOTH);


        ListView actualListView = mPullRefreshListView.getRefreshableView();

        mListItems = new LinkedList<String>();
        mListItems.addAll(Arrays.asList(mStrings));

        mAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, mListItems);


        // You can also just use setListAdapter(mAdapter) or
        // mPullRefreshListView.setAdapter(mAdapter)
        actualListView.setAdapter(mAdapter);
        mPullRefreshListView.setOnRefreshListener(new PullToRefreshBase.OnRefreshListener2<ListView>() {
            @Override
            public void onPullDownToRefresh(PullToRefreshBase<ListView> refreshView) {
                new GetDataTask().execute();
            }

            @Override
            public void onPullUpToRefresh(PullToRefreshBase<ListView> refreshView) {
                new GetDataTask2().execute();
            }
        });
    }

    private class GetDataTask extends AsyncTask<Void, Void, String[]> {

        @Override
        protected String[] doInBackground(Void... params) {
            // Simulates a background job.
            try {
                Thread.sleep(2000);
            } catch (InterruptedException e) {
            }
            return mStrings;
        }

        @Override
        protected void onPostExecute(String[] result) {
            mListItems.addFirst("Added after refresh...");
            mAdapter.notifyDataSetChanged();

            // Call onRefreshComplete when the list has been refreshed.
            mPullRefreshListView.onRefreshComplete();

            super.onPostExecute(result);
        }
    }


    private class GetDataTask2 extends AsyncTask<Void, Void, String[]> {

        @Override
        protected String[] doInBackground(Void... params) {
            // Simulates a background job.
            try {
                Thread.sleep(2000);
            } catch (InterruptedException e) {
            }
            return mStrings;
        }

        @Override
        protected void onPostExecute(String[] result) {
            mListItems.addLast("Added after loadmore1...");
            mListItems.addLast("Added after loadmore2...");
            mListItems.addLast("Added after loadmore3...");
            mAdapter.notifyDataSetChanged();

            // Call onRefreshComplete when the list has been refreshed.
            mPullRefreshListView.onRefreshComplete();

            super.onPostExecute(result);
        }
    }
}