我创建了一个应用程序,用于从Web获取rss feed并将其显示在listview上,我想向下滑动(拉动)以刷新listview项,这是我的第一个问题,第二个问题是当我向下滚动列表时,如果我在列表视图上向上滚动,它会开始刷新吗? 我的主要活动。java:
public class MainActivity extends AppCompatActivity {
private ListView listView;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
if (savedInstanceState == null) {
addRssFragment();
}
listView=(ListView)findViewById(R.id.listView);
final SwipeRefreshLayout pullToRefresh = (SwipeRefreshLayout) findViewById(R.id.swipe_container);
pullToRefresh.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
@Override
public void onRefresh() {
addRssFragment();
pullToRefresh.setRefreshing(false);
}
});
}
private void addRssFragment() {
FragmentManager manager = getSupportFragmentManager();
FragmentTransaction transaction = manager.beginTransaction();
RssFragment fragment = new RssFragment();
transaction.add(R.id.fragment_container, fragment);
transaction.commit();
}
}
我的RssFragment.java:
public class RssFragment extends Fragment implements OnItemClickListener {
private ProgressBar progressBar;
private ListView listView;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_layout, container, false);
progressBar = (ProgressBar) view.findViewById(R.id.progressBar);
listView = (ListView) view.findViewById(R.id.listView);
listView.setOnItemClickListener(this);
return view;
}
@Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
startService();
}
private void startService() {
Intent intent = new Intent(getActivity(), RssService.class);
getActivity().startService(intent);
}
/**
* Once the {@link RssService} finishes its task, the result is sent to this BroadcastReceiver
*/
private BroadcastReceiver resultReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
progressBar.setVisibility(View.GONE);
List<RssItem> items = (List<RssItem>) intent.getSerializableExtra(RssService.ITEMS);
if (items != null) {
RssAdapter adapter = new RssAdapter(getActivity(), items);
listView.setAdapter(adapter);
} else {
Toast.makeText(getActivity(), "An error occurred while downloading the rss feed.",
Toast.LENGTH_LONG).show();
}
}
};
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
RssAdapter adapter = (RssAdapter) parent.getAdapter();
RssItem item = (RssItem) adapter.getItem(position);
Uri uri = Uri.parse(item.getLink());
Intent intent = new Intent(Intent.ACTION_VIEW, uri);
startActivity(intent);
}
第二期: fragment_layout:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<ListView
android:id="@+id/listView"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
</ListView>
<ProgressBar
android:id="@+id/progressBar"
style="?android:attr/progressBarStyleLarge"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true" />
</RelativeLayout>
主要
<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.SwipeRefreshLayout
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:id="@+id/swipe_container"
android:layout_width="match_parent"
android:layout_height="match_parent">
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:id="@+id/fragment_container"
android:layout_height="fill_parent" />
</android.support.v4.widget.SwipeRefreshLayout>
答案 0 :(得分:1)
首先,您应在SwipeRefreshLayout
下的fragment_layout
中添加列表视图。
这就是您的fragment_layout
的样子
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<android.support.v4.widget.SwipeRefreshLayout
android:id="@+id/swipe_container"
android:layout_width="match_parent"
android:layout_height="match_parent">
<ListView
android:id="@+id/listView"
android:layout_width="match_parent"
android:layout_height="match_parent" >
</ListView>
</android.support.v4.widget.SwipeRefreshLayout>
</RelativeLayout>
主要布局。
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:id="@+id/fragment_container"
android:layout_height="match_parent" />
从片段中删除onActivityCreated
方法,并在下面的onCreateView
方法下替换
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_layout, container, false);
progressBar = (ProgressBar) view.findViewById(R.id.progressBar);
listView = (ListView) view.findViewById(R.id.listView);
listView.setOnItemClickListener(this);
final SwipeRefreshLayout pullToRefresh = (SwipeRefreshLayout) findViewById(R.id.swipe_container);
pullToRefresh.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
@Override
public void onRefresh() {
startService();
pullToRefresh.setRefreshing(false);
}
});
return view;
}