it-swarm.com.de

So implementieren Sie "Zum Aktualisieren nach unten streichen" wie in der neuen GMail-App

Google veröffentlicht die neue Google Mail-App mit einer alternativen Methode zum Herunterziehen und Aktualisieren.

Anstatt die gestartete versteckte Zeile anzuzeigen, die heruntergezogen wird. Google Mail zeigt eine animierte Nachricht über der Aktionsleiste an.

Die Nachricht enthält eine animierte horizontale Linie.

Ist dies eine Standardfunktion des Android SDK? Ich kann in der Aktionsleisten-API nichts finden, was dies tun würde.

enter image description here

33
Reactgular

Chris Banes 'ActionBar-PullToRefresh-Bibliothek auf GitHub bietet wahrscheinlich eine Pull-to-Refresh-Funktion, die der GMail-App am nächsten kommt.

Siehe auch: Juhani Lehtimäkis Analyse von GMail Pull-to-Refresh .

22
laalto

Google hat die Unterstützung dafür direkt im SDK veröffentlicht. Ich bin nicht sicher, welche Version Sie unterstützen müssen (dies kann ein Problem sein).

Informationen zu den offiziellen SDK-Funktionen finden Sie hier: http://developer.Android.com/reference/Android/support/v4/widget/SwipeRefreshLayout.html

Wenn Sie in der Lage sind, das SDK zu verwenden, sind Sie besser dran, selbst Chris Banes hat ein post geschrieben, das dasselbe vorschlägt.

48
Booger

versuch das ... es ist Arbeit für mich.

res/layout/activity_main.xml

 <FrameLayout xmlns:Android="http://schemas.Android.com/apk/res/Android"
xmlns:tools="http://schemas.Android.com/tools"
Android:id="@+id/container"
Android:layout_width="match_parent"
Android:layout_height="match_parent"
tools:context="com.swipetorefresh.MainActivity"
tools:ignore="MergeRootFrame" />

res/layout/fragment_main.xml

<Android.support.v4.widget.SwipeRefreshLayout           
       xmlns:Android="http://schemas.Android.com/apk/res/Android"
      xmlns:tools="http://schemas.Android.com/tools"
      Android:id="@+id/container"
      Android:layout_width="match_parent"
      Android:layout_height="match_parent"
       tools:ignore="MergeRootFrame" >

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

</Android.support.v4.widget.SwipeRefreshLayout>

MainActivity.Java

  public class MainActivity extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    if (savedInstanceState == null) {
        getFragmentManager().beginTransaction()
                .add(R.id.container, new PlaceholderFragment()).commit();
    }
}

public static class PlaceholderFragment extends ListFragment implements OnRefreshListener {

    private SwipeRefreshLayout mSwipeRefreshLayout;

    private static final int LIST_ITEM_COUNT = 5;
    private int mOffset = 0;

    private ArrayAdapter<String> mListAdapter;

    public PlaceholderFragment() {
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.fragment_main, container,
                false);

        // Configure the swipe refresh layout
        mSwipeRefreshLayout = (SwipeRefreshLayout) rootView.findViewById(R.id.container);
        mSwipeRefreshLayout.setOnRefreshListener(this);
        mSwipeRefreshLayout.setColorScheme(
                R.color.swipe_color_1, R.color.swipe_color_2,
                R.color.swipe_color_3, R.color.swipe_color_4);

        // Put the first batch of countries in the list
        mListAdapter = new ArrayAdapter<String>(
                getActivity(),
                Android.R.layout.simple_list_item_1,
                Android.R.id.text1,
                getCountries(mOffset));

        setListAdapter(mListAdapter);

        return rootView;
    }

    private List<String> getCountries(int offset) {
        ArrayList<String> countriesList = new ArrayList<String>();
        for(int i=0; i<LIST_ITEM_COUNT;i++){
            countriesList.add(COUNTRIES[offset+i]);
        }

        mOffset = offset + LIST_ITEM_COUNT;
        return countriesList;
    }

    @Override
    public void onRefresh() {
        // Start showing the refresh animation
        mSwipeRefreshLayout.setRefreshing(true);

        // Simulate a long running activity
        new Handler().postDelayed(new Runnable() {
            @Override
            public void run() {
               updateCountries();
            }
        }, 5000);
    }



    private void updateCountries() {

        // Add the next batch of countries to the list
        mListAdapter.addAll(getCountries(mOffset));

        // Signify that we are done refreshing
        mSwipeRefreshLayout.setRefreshing(false);
    }



    private static final String[] COUNTRIES = {"Afghanistan",
        "Albania", "Algeria", "American Samoa", "Andorra", "Angola",
        "Anguilla", "Antarctica", "Antigua and Barbuda", "Argentina",
        "Armenia", "Aruba", "Australia", "Austria", "Azerbaijan",
        "Bahamas", "Bahrain", "Bangladesh", "Barbados", "Belarus",
        "Belgium", "Belize", "Benin", "Bermuda", "Bhutan",
        "Bolivia", "Bosnia and Herzegovina", "Botswana", "Brazil",
        "Brunei Darussalam", "Bulgaria", "Burkina Faso", "Burundi",
        "Cambodia", "Cameroon", "Canada", "Cape Verde", "Cayman Islands",
        "Central African Republic", "Chad", "Chile", "China",
        "Christmas Island", "Cocos (Keeling) Islands", "Colombia",
        "Comoros", "Democratic Republic of the Congo (Kinshasa)",
        "Congo, Republic of(Brazzaville)", "Cook Islands", "Costa Rica",
        "Ivory Coast", "Croatia", "Cuba", "Cyprus", "Czech Republic",
        "Denmark", "Djibouti", "Dominica", "Dominican Republic",
        "East Timor (Timor-Leste)", "Ecuador", "Egypt",
        "El Salvador", "Equatorial Guinea", "Eritrea", "Estonia", "Ethiopia"};

        }
   }
10
Rakesh Rangani

Chris Banes (derselbe Typ, der die beste Pull-to-Refresh-Komponente für Android implementiert hat) implementierte auch das Gmail wie Pull To Refresh.

Sie finden es hier: https://github.com/chrisbanes/ActionBar-PullToRefresh

Beachten Sie, dass sich dieses Projekt noch in der Entwicklung befindet, sodass sich die aktuelle API möglicherweise ändert.

3
sonida
fragment_main.xml

<RelativeLayout xmlns:Android="http://schemas.Android.com/apk/res/Android"
    xmlns:tools="http://schemas.Android.com/tools"
    Android:layout_width="match_parent"
    Android:layout_height="match_parent"
    Android:paddingBottom="@dimen/activity_vertical_margin"
    Android:paddingLeft="@dimen/activity_horizontal_margin"
    Android:paddingRight="@dimen/activity_horizontal_margin"
    Android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.testloading.MainActivity$PlaceholderFragment" >

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

</RelativeLayout>    


counteries.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="vertical" >

    <TextView 
        Android:id="@+id/text_view"
        Android:layout_width="match_parent"
        Android:layout_height="47dp"
        Android:gravity="center_vertical"
        Android:textStyle="bold"/>
</LinearLayout>



package com.example.testloading;

import Java.util.ArrayList;
import Java.util.List;

import Android.content.Context;
import Android.os.Bundle;
import Android.support.v4.app.Fragment;
import Android.support.v7.app.ActionBarActivity;
import Android.util.Log;
import Android.view.LayoutInflater;
import Android.view.Menu;
import Android.view.MenuItem;
import Android.view.View;
import Android.view.ViewGroup;
import Android.widget.AbsListView;
import Android.widget.AbsListView.OnScrollListener;
import Android.widget.BaseAdapter;
import Android.widget.ListView;
import Android.widget.TextView;

public class MainActivity extends ActionBarActivity {

    private static final String TAG = MainActivity.class.getSimpleName();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        if (savedInstanceState == null) {
            getSupportFragmentManager().beginTransaction()
                    .add(R.id.container, new PlaceholderFragment()).commit();
        }
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {

        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();
        if (id == R.id.action_settings) {
            return true;
        }
        return super.onOptionsItemSelected(item);
    }

    /**
     * A placeholder fragment containing a simple view.
     */
    public static class PlaceholderFragment extends Fragment {

        private ListView listView;
        private static final int LIST_ITEM_COUNT = 20;
        private int mOffset = 0;
        private boolean flag_loading;

        private MyAdapter adapter;
        private List<String> list;

        public PlaceholderFragment() {
        }

        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container,
                Bundle savedInstanceState) {
            View rootView = inflater.inflate(R.layout.fragment_main, container,
                    false);

            listView = (ListView) rootView.findViewById(R.id.list);
            list = getCountries(mOffset);
            adapter = new MyAdapter(list, getActivity());
            listView.setAdapter(adapter);
            listView.setOnScrollListener(new OnScrollListener() {

                @Override
                public void onScrollStateChanged(AbsListView view,
                        int scrollState) {
                }

                @Override
                public void onScroll(AbsListView view, int firstVisibleItem,
                        int visibleItemCount, int totalItemCount) {
                    Log.d(TAG, "firstVisibleItem : " + firstVisibleItem
                            + " , visibleItemCount : " + visibleItemCount
                            + " , totalItemCount : " + totalItemCount);
                    if (firstVisibleItem + visibleItemCount == totalItemCount) {
                        Log.d(TAG, "ZZZ offSet : " + mOffset);
                        if (COUNTRIES.length > mOffset) {
                            if (flag_loading == false) {
                                Log.d(TAG, "ZZZ inside : ");
                                flag_loading = true;
                                additems();
                            }
                        }
                    }

                }
            });
            return rootView;
        }

        protected void additems() {
            list.addAll(getCountries(mOffset));
            adapter.notifyDataSetChanged();
            listView.invalidate();
            flag_loading = false;
        }

        private List<String> getCountries(int offset) {
            ArrayList<String> countriesList = new ArrayList<String>();
            for (int i = 0; i < LIST_ITEM_COUNT; i++) {
                if (COUNTRIES.length > offset + i) {
                    countriesList.add(COUNTRIES[offset + i]);
                }
            }

            mOffset = offset + LIST_ITEM_COUNT;
            return countriesList;
        }

        private static final String[] COUNTRIES = { "Afghanistan", "Albania",
                "Algeria", "American Samoa", "Andorra", "Angola", "Anguilla",
                "Antarctica", "Antigua and Barbuda", "Argentina", "Armenia",
                "Aruba", "Australia", "Austria", "Azerbaijan", "Bahamas",
                "Bahrain", "Bangladesh", "Barbados", "Belarus", "Belgium",
                "Belize", "Benin", "Bermuda", "Bhutan", "Bolivia",
                "Bosnia and Herzegovina", "Botswana", "Brazil",
                "Brunei Darussalam", "Bulgaria", "Burkina Faso", "Burundi",
                "Cambodia", "Cameroon", "Canada", "Cape Verde",
                "Cayman Islands", "Central African Republic", "Chad", "Chile",
                "China", "Christmas Island", "Cocos (Keeling) Islands",
                "Colombia", "Comoros",
                "Democratic Republic of the Congo (Kinshasa)",
                "Congo, Republic of(Brazzaville)", "Cook Islands",
                "Costa Rica", "Ivory Coast", "Croatia", "Cuba", "Cyprus",
                "Czech Republic", "Denmark", "Djibouti", "Dominica",
                "Dominican Republic", "East Timor (Timor-Leste)", "Ecuador",
                "Egypt", "El Salvador", "Equatorial Guinea", "Eritrea",
                "Estonia", "Ethiopia" };

    }
}

class MyAdapter extends BaseAdapter {

    private List<String> list;
    private LayoutInflater layoutInflater;

    public MyAdapter(List<String> list, Context context) {
        this.list = list;
        layoutInflater = (LayoutInflater) context
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    }

    @Override
    public int getCount() {
        return list.size();
    }

    @Override
    public Object getItem(int position) {
        return list.get(position);
    }

    @Override
    public long getItemId(int arg0) {
        // TODO Auto-generated method stub
        return 0;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup arg2) {

        ViewHolder viewHolder;

        if (convertView == null) {
            convertView = layoutInflater.inflate(R.layout.counteries, null);
            viewHolder = new ViewHolder();
            viewHolder.textView = (TextView) convertView
                    .findViewById(R.id.text_view);
            convertView.setTag(viewHolder);
        } else {
            viewHolder = (ViewHolder) convertView.getTag();
        }

        viewHolder.textView.setText(list.get(position));
        return convertView;
    }

    class ViewHolder {
        public TextView textView;
    }
}
1
App Kart

Probier es aus. Using: swipeRefreshLayout.setRotation (180f);

Und in Ihrem Adapter ListView, Methode getView: view.setRotation (180f);

umgekehrte Reihenfolge Ihrer Artikel in der Liste.

Oder direkt mit Android: rotation = "180" in xml.