使用getFilter()

时间:2018-05-27 09:28:17

标签: java android listview

我的java文件是:这个文件包含Listview中的搜索和排序,但是在使用搜索栏后排序不起作用,我发现的问题是代码:adapter.getFilter()。filter(charSequence)当我删除它时,该应用程序工作正常,但未完成过滤。所以问题在于那条线。有没有办法在listview中进行搜索和排序?

public class MainActivity extends AppCompatActivity {
public List<String> galaxies=new ArrayList<>();
boolean ascending = true;
/*
- When activity is created.
 */
private Button sortBtn;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);

    final ListView lv= (ListView) findViewById(R.id.mListView);

    //REFERENCE MATERIALSEARCHBAR AND LISTVIEW

    MaterialSearchBar searchBar = (MaterialSearchBar)  
    findViewById(R.id.searchBar);
    searchBar.setHint("Search..");


    galaxies.add("Cartwheel");
    galaxies.add("Whirlpool");
    galaxies.add("Andromeda I");
    galaxies.add("Andromeda II");
    galaxies.add("Sombrero");
    galaxies.add("Messier 81");
    galaxies.add("Messier 87");
    galaxies.add("Canis Majos Over-density");
    galaxies.add("Messier 92");
    galaxies.add("Black Eye");
    galaxies.add("Centaurus A");
    galaxies.add("Centaurus B");
    galaxies.add("Milky Way");
    galaxies.add("IC 1011");
    galaxies.add("Star Bust");
    galaxies.add("Hoag's Object");
    galaxies.add("Pinwheel");
    galaxies.add("Triangulum");
    galaxies.add("Cosmos Redshift");
    galaxies.add("Ursa Minor");
    galaxies.add("Virgo Stellar-Stream");

    //ADAPTER
    final ArrayAdapter adapter=new 
    ArrayAdapter(this,android.R.layout.simple_list_item_1,galaxies);
    lv.setAdapter(adapter);

    //SORT
    sortBtn = (Button) findViewById(R.id.sortBtn);

    adapter.notifyDataSetChanged();
    lv.setTextFilterEnabled(true);
    sortBtn.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            if (ascending)
            {
                Collections.sort(galaxies);
                Toast.makeText(getApplicationContext(),galaxies.get(0),
                        Toast.LENGTH_SHORT).show();
            }
            else
            {
                Collections.reverse(galaxies);
                Toast.makeText(getApplicationContext(),galaxies.get(0),
                        Toast.LENGTH_SHORT).show();
            }


            lv.setAdapter(adapter);
            ascending = !ascending;

        }
    });

    //SEARCHBAR TEXT CHANGE LISTENER
    searchBar.addTextChangeListener(new TextWatcher() {
        @Override
        public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {

        }

        @Override
        public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {
            //SEARCH FILTER
            adapter.getFilter().filter(charSequence);

        }

        @Override
        public void afterTextChanged(Editable editable) {


        }
    });


    //LISTVIEW ITEM CLICKED
    lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
            Toast.makeText(MainActivity.this, adapter.getItem(i).toString(), Toast.LENGTH_SHORT).show();
        }
    });

 }
}

我的内容xml是:

<?xml version="1.0" encoding="utf-8"?>
<!--
- ActivityMain.xml.
- This is a template layout for our MainActivity.
- Root layout tag is CoordinatorLayout from design support library.
- CordinatorLayout is viewgroup that is a superpowered on framelayout.
- CoordinatorLayout is intended for two primary use cases:
As a top-level application decor or chrome layout
As a container for a specific interaction with one or more child views
- Inside our CordinatorLayout we add : AppBarLayout,FloatingActionButton and include content_main.xml.
- AppBarLayout is vertical LinearLayout that implements scrolling features of material design concept.
- It should be a direct child of CordinatorLayout, otherwise alot of features won't work.
- Inside the AppBarLayout we add our toolbar,which we give a blue color.
- Next we add our Material SearchBar which will give us the searchbar.
- We can specify attributes like style and hint.
- We will add our widgets in our content_main.xml, not here as this is a template layout.
- Finally we have a FloatingActionButton, a class that derives from android.support.design.widget.VisibilityAwareImageButton.
Its the round button you see in our user interface.
-->
<android.support.design.widget.CoordinatorLayout 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:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.tutorials.hp.searchbarlistview.MainActivity">

    <android.support.design.widget.AppBarLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:theme="@style/AppTheme.AppBarOverlay">
        <android.support.v7.widget.Toolbar
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            android:background="?attr/colorPrimary"
            app:popupTheme="@style/AppTheme.PopupOverlay" />
        <com.mancj.materialsearchbar.MaterialSearchBar
             app:mt_hint="Custom hint"
            app:theme="@style/AppTheme.PopupOverlay"
            app:mt_maxSuggestionsCount="5"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:id="@+id/searchBar" />
    </android.support.design.widget.AppBarLayout>

    <include layout="@layout/content_main" />

    <Button
        android:id="@+id/sortBtn"
        android:layout_width="100dp"
        android:layout_height="40dp"
        android:layout_centerInParent="true"
        android:layout_gravity="bottom|end|center_horizontal"
        android:background="@color/colorAccent"
        android:text="Sort"
        tools:layout_editor_absoluteX="0dp"
        tools:layout_editor_absoluteY="16dp" />

</android.support.design.widget.CoordinatorLayout>

问题是,当我使用排序按钮时,它工作正常,但只在开始时。当我使用搜索栏并使用排序选项时,它不起作用

2 个答案:

答案 0 :(得分:0)

一旦你点击过滤器,阵列适配器会维护你的值的单独副本,你对自己的星系列表副本所做的任何更改都不会影响你的列表,请尝试使用此代码对值进行排序

adapter.sort(list, new Comparator<String>() {
@Override
public int compare(String s1, String s2) {
    return s1.compareTo(s2);
}

});

这将对您的适配器维护的副本进行排序

答案 1 :(得分:0)

您可以使自定义适配器扩展BaseAdapter并将列表传递到自定义适配器的构造函数中。 您可以在最后维护两个不同的列表副本。 第一个将是原始列表,第二个将是您传递给适配器构造函数的那个​​。

以下链接会给您一个想法: Custom Adapter for List View