Question

下面是我的代码，它适用于水平显示列表视图。如何将其更改为gridvew。我应该做些什么更改才能将其更改为gridview？请帮帮我

public class fifthscreen extends Activity {

int IOConnect = 0;

String _response;
String status;

HorizontalListView listview;
CategoryListAdapter3 cla;

String URL, URL2;
String SelectMenuAPI;
static ArrayList<Long> Category_ID = new ArrayList<Long>();
static ArrayList<String> Category_name = new ArrayList<String>();
static ArrayList<String> Category_image = new ArrayList<String>();
public static String allergen2;

String name;

String url1;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.fifthscreen);

    listview = (HorizontalListView) this.findViewById(R.id.listview2);

    cla = new CategoryListAdapter3(fifthscreen.this);
    new TheTask().execute();
}

public class TheTask extends AsyncTask<Void, String, String> {

    @Override
    protected void onPreExecute() {
        super.onPreExecute();

    }

    @Override
    protected String doInBackground(Void... arg0) {

        try {


            HttpGet request = new HttpGet(url);
            HttpResponse response = client.execute(request);
            HttpEntity resEntity = response.getEntity();
            _response = EntityUtils.toString(resEntity);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return _response;
    }

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

        try {

            JSONObject json2 = new JSONObject(result);

            status = json2.getString("status");
            if (status.equals("1")) {

                JSONArray school4 = json2.getJSONArray("dish_allergen");
                //
                for (int i = 0; i < school4.length(); i++) {
                    JSONObject object = school4.getJSONObject(i);

                    Category_ID.add((long) i);
                    Category_name.add(object.getString("name"));
                    Category_image.add(object.getString("image"));

                }

            }

            else {

                JSONArray school2 = json2.getJSONArray("data");
                for (int i = 0; i < school2.length(); i++) {
                    JSONObject object = school2.getJSONObject(i);

                    Category_ID.add((long) i);
                    Category_name.add(object.getString("name"));
                }
            }

        } catch (JSONException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

        listview.setAdapter(cla);
    }
}
     }







   public class CategoryListAdapter3 extends BaseAdapter {

private Activity activity;

private AQuery androidAQuery;


public CategoryListAdapter3(Activity act) {
    this.activity = act;
//  imageLoader = new ImageLoader(act);
}

public int getCount() {
    // TODO Auto-generated method stub
    return fifthscreen.Category_ID.size();
}

public Object getItem(int position) {
    // TODO Auto-generated method stub
    return position;
}

public long getItemId(int position) {
    // TODO Auto-generated method stub
    return position;
}

public View getView(int position, View convertView, ViewGroup parent) {
    // TODO Auto-generated method stub
    ViewHolder holder;
    androidAQuery = new AQuery(getcontext());
    if(convertView == null){
        LayoutInflater inflater = (LayoutInflater) activity
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        convertView = inflater.inflate(R.layout.viewitem2, null);
        holder = new ViewHolder();

        convertView.setTag(holder);
    }else{
        holder = (ViewHolder) convertView.getTag();
    }


    holder.txtText = (TextView) convertView.findViewById(R.id.title2);
    holder.imgThumb = (ImageView) convertView.findViewById(R.id.image2);

    holder.txtText.setText(fifthscreen.Category_name.get(position));
    //  imageLoader.DisplayImage(fifthscreen.Category_image.get(position),   
          activity, holder.imgThumb);


     androidAQuery.id(holder.imgThumb).image(fifthscreen.Category_image.get(position), false, 
     false);

    return convertView;
}
private Activity getcontext() {
    // TODO Auto-generated method stub
    return null;
}
static class ViewHolder {
    TextView txtText;
    ImageView imgThumb;
}

          }



             <!---  fifithscreen.xml--->

                  <LinearLayout
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"
          android:layout_marginLeft="10dp"
          android:layout_marginRight="10dp"
          android:layout_below="@+id/test_button_text5"
         android:orientation="vertical" >

   <com.example.examplecode.HorizontalListView
           android:id="@+id/listview2"
           android:layout_width="wrap_content"
           android:layout_height="120dp"
             android:layout_below="@+id/test_button_text5"

           android:background="#ffffff"/>


      </LinearLayout>




   <!--viewitem2.xml--->



     <?xml version="1.0" encoding="utf-8"?>
  <LinearLayout
  xmlns:android="http://schemas.android.com/apk/res/android"
  android:orientation="vertical"
 android:layout_width="wrap_content"
   android:layout_height="wrap_content"

   >

  <ImageView
android:id="@+id/image2"
   android:layout_width="90dp"
 android:layout_height="70dp"
  android:scaleType="fitXY"
 android:padding="5dp"

  android:layout_marginLeft="5dp"
   android:layout_marginRight="5dp"

android:src="@drawable/ic_launcher"
/>

<TextView
android:id="@+id/title2"
android:layout_width="90dp"
android:layout_height="wrap_content"
android:textColor="#000"
android:paddingTop="10dp"


android:gravity="center_horizontal"
/>



   </LinearLayout>

Answer 1

完全没有变化。只需将GridView的适配器设置为ListView的设置。

Answer 2

我建议你使用 RecyclerView intead。

您可能需要参考documentation并详细了解相关信息。我正在分享我的代码片段，我正在使用RecyclerView将gridview更改为listview

如果您正在使用Android Studio，则可能需要在gradle构建中添加依赖项。在我的情况下，我添加如下：

dependencies {
    .
    .
    .
    compile 'com.android.support:recyclerview-v7:24.0.0'
}

首先，我要定义一个用于网格布局的网格单元

<强> recycler_cell.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content">

<ImageView
    android:layout_width="100dp"
    android:layout_height="100dp"
    android:id="@+id/imageView2"
    android:layout_alignParentTop="true"
    android:layout_alignParentStart="true"
    android:background="#FF000000"
    android:layout_marginLeft="0dp"
    android:layout_marginRight="0dp"/>

<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textAppearance="?android:attr/textAppearanceSmall"
    android:text="Small Text"
    android:id="@+id/textView2"
    android:layout_below="@+id/imageView2"
    android:layout_alig=nParentStart="true"
    android:layout_alignEnd="@+id/imageView2"
    android:gravity="center"/>
</RelativeLayout>

现在我正在定义一个列表行，用于列表布局

<强> recycler_row.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
            android:orientation="vertical"
            android:layout_width="match_parent"
            android:layout_height="wrap_content">

<ImageView
    android:layout_width="100dp"
    android:layout_height="100dp"
    android:id="@+id/imageView"
    android:layout_alignParentTop="true"
    android:layout_alignParentStart="true"
    android:background="#FF000000"/>

<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textAppearance="?android:attr/textAppearanceLarge"
    android:text="Large Text"
    android:id="@+id/textView"
    android:layout_alignParentTop="true"
    android:layout_alignBottom="@+id/imageView"
    android:layout_alignParentEnd="true"
    android:layout_toEndOf="@+id/imageView"
    android:gravity="center_vertical"
    android:background="#FF333333"
    android:textColor="#FFF"
    android:padding="10dp"/>
</RelativeLayout>

<强> recycler_view_test.xml 当然还要定义一个包含RecyclerView

的布局

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
            android:orientation="vertical"
            android:layout_width="match_parent"
            android:layout_height="match_parent">

<android.support.v7.widget.RecyclerView
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:id="@+id/recyclerView"
    android:layout_alignParentLeft="true"
    android:layout_marginLeft="0dp"
    android:layout_alignParentTop="true"
    android:layout_marginTop="0dp"
    android:layout_centerHorizontal="true"
    >
</android.support.v7.widget.RecyclerView>

<Button
    style="?android:attr/buttonStyleSmall"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Change Layout"
    android:id="@+id/btnChange"
    android:layout_alignParentBottom="true"
    android:layout_centerHorizontal="true"
    android:layout_marginBottom="62dp"/>

</RelativeLayout>

我正在分享我的代码，但我强烈建议您阅读文档和教程，以全面了解RecyclerView。

public class RecyclerViewTest extends AppCompatActivity
{
    final int GRID = 0;
    final int LIST = 1;
    int type;

    RecyclerView recyclerView;
    RecyclerView.LayoutManager gridLayoutManager, linearLayoutManager;
    MyAdapter adapter;

    Button btnChange;


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

        // Display contents in views
        final List<Person> list = new ArrayList<>();
        list.add(new Person("Ariq Row 1"));
        list.add(new Person("Ariq Row 2"));
        list.add(new Person("Ariq Row 3"));

        // Finding views by id
        recyclerView = (RecyclerView) findViewById(R.id.recyclerView);
        btnChange = (Button) findViewById(R.id.btnChange);

        // Defining Linear Layout Manager
        linearLayoutManager = new LinearLayoutManager(getApplicationContext());
        // Defining Linear Layout Manager (here, 3 column span count)
        gridLayoutManager = new GridLayoutManager(getApplicationContext(), 3);

        //Setting gird view as default view
        type = GRID;
        adapter = new MyAdapter(list, GRID);
        recyclerView.setLayoutManager(gridLayoutManager);
        recyclerView.setAdapter(adapter);

        //Setting click listener
        btnChange.setOnClickListener(new View.OnClickListener()
        {
            @Override
            public void onClick(View view)
            {
                if (type == LIST)
                {
                    // Change to grid view
                    adapter = new MyAdapter(list, GRID);
                    recyclerView.setLayoutManager(gridLayoutManager);
                    recyclerView.setAdapter(adapter);
                    type = GRID;
                }

                else
                {
                    // Change to list view
                    adapter = new MyAdapter(list, LIST);
                    recyclerView.setLayoutManager(linearLayoutManager);
                    recyclerView.setAdapter(adapter);
                    type = LIST;
                }
            }
        });

    }
}

//Defining Adapter
class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder>
{
    List<Person> list;
    int type;
    final int GRID = 0;
    final int LIST = 1;

    MyAdapter(List<Person> list, int type)
    {
        this.list = list;
        this.type = type;
    }

    // Inflating views if the existing layout items are not being recycled
    @Override
    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType)
    {
        View itemView;

        if (viewType == GRID)
        {
            // Inflate the grid cell as a view item
            itemView = LayoutInflater.from(parent.getContext()).inflate(R.layout.recycler_cell, parent, false);
        }

        else
        {
            // Inflate the list row as a view item
            itemView = LayoutInflater.from(parent.getContext()).inflate(R.layout.recycler_row, parent, false);
        }

        return new ViewHolder(itemView, viewType);
    }

    // Add data to your layout items
    @Override
    public void onBindViewHolder(ViewHolder holder, int position)
    {
        Person person = list.get(position);
        holder.textView.setText(person.name);
    }

    // Number of items
    @Override
    public int getItemCount()
    {
        return list.size();
    }

    // Using the variable "type" to check which layout is to be displayed
    @Override
    public int getItemViewType(int position)
    {
        if (type == GRID)
        {
            return GRID;
        }

        else
        {
            return LIST;
        }
    }

    // Defining ViewHolder inner class
    public class ViewHolder extends RecyclerView.ViewHolder
    {
        TextView textView;
        final int GRID = 0;
        final int LIST = 1;

        public ViewHolder(View itemView, int type)
        {
            super(itemView);
            if (type == GRID)
            {
                textView = (TextView) itemView.findViewById(R.id.textView2);
            }

            else
            {
                textView = (TextView) itemView.findViewById(R.id.textView);
            }
        }
    }
}

// Data Source Class
class Person
{
    String name;

    Person(String name)
    {
        this.name = name;
    }
}

如果您最终遇到问题，以便在网格布局的情况下自动调整列数，那么您可能需要检查@s-marks's answer，在其中扩展了GridLayoutManager类并添加了自己的代码补丁，并且如果你开始有奇怪的列宽，我的fix。

就我而言，使用他的解决方案我按如下方式编写了一个类：

class GridAutofitLayoutManager extends GridLayoutManager
{
    private int mColumnWidth;
    private boolean mColumnWidthChanged = true;

    public GridAutofitLayoutManager(Context context, int columnWidth)
    {
        /* Initially set spanCount to 1, will be changed automatically later. */
        super(context, 1);
        setColumnWidth(checkedColumnWidth(context, columnWidth));
    }

    public GridAutofitLayoutManager(Context context, int columnWidth, int orientation, boolean reverseLayout)
    {
        /* Initially set spanCount to 1, will be changed automatically later. */
        super(context, 1, orientation, reverseLayout);
        setColumnWidth(checkedColumnWidth(context, columnWidth));
    }

    private int checkedColumnWidth(Context context, int columnWidth)
    {
        if (columnWidth <= 0)
        {
            /* Set default columnWidth value (48dp here). It is better to move this constant
            to static constant on top, but we need context to convert it to dp, so can't really
            do so. */
            columnWidth = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 48,
                    context.getResources().getDisplayMetrics());
        }

        else
        {
            columnWidth = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, columnWidth,
                    context.getResources().getDisplayMetrics());
        }
        return columnWidth;
    }

    public void setColumnWidth(int newColumnWidth)
    {
        if (newColumnWidth > 0 && newColumnWidth != mColumnWidth)
        {
            mColumnWidth = newColumnWidth;
            mColumnWidthChanged = true;
        }
    }

    @Override
    public void onLayoutChildren(RecyclerView.Recycler recycler, RecyclerView.State state)
    {
        int width = getWidth();
        int height = getHeight();
        if (mColumnWidthChanged && mColumnWidth > 0 && width > 0 && height > 0)
        {
            int totalSpace;
            if (getOrientation() == VERTICAL)
            {
                totalSpace = width - getPaddingRight() - getPaddingLeft();
            }
            else
            {
                totalSpace = height - getPaddingTop() - getPaddingBottom();
            }
            int spanCount = Math.max(1, totalSpace / mColumnWidth);
            setSpanCount(spanCount);
            mColumnWidthChanged = false;
        }
        super.onLayoutChildren(recycler, state);
    }
}

然后你只需要改变：

gridLayoutManager = new GridLayoutManager(getApplicationContext(), 3);

并使用您的自定义网格布局对象，此处100是dp

中列的宽度

gridLayoutManager = new GridAutofitLayoutManager(getApplicationContext(), 100);

Answer 3

您可以这样做：

对于网格/列表的布局，请使用合并：

<?xml version="1.0" encoding="utf-8"?>

<merge xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >


<ViewStub android:id="@+id/list" 
    android:inflatedId="@+id/showlayout"
    android:layout="@layout/list_view" 
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:layout_marginTop="10dp"/>

<ViewStub android:id="@+id/grid" 
    android:inflatedId="@+id/showlayout"
    android:layout="@layout/grid_view" 
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:layout_marginTop="10dp"/>


</merge>

然后定义列表和网格（以及它们的项目）的布局，并管理它们之间的通道膨胀布局，然后使用这样的方法来更改当前视图：

private void changeView() {

    //if the current view is the listview, passes to gridview
    if(list_visibile) {
        listview.setVisibility(View.GONE);
        gridview.setVisibility(View.VISIBLE);
        list_visibile = false;
        setAdapters();
    }

    else {
        gridview.setVisibility(View.GONE);                      
        listview.setVisibility(View.VISIBLE);
        list_visibile = true;
        setAdapters();
    }
}

如果您需要完整的代码，可以在本文中找到：

http://pillsfromtheweb.blogspot.it/2014/12/android-passare-da-listview-gridview.html

Answer 4

只需使用GridView对象代替Listview：

GridView gridView;
gridView= (GridView) this.findViewById(R.id.gridView1);

getView CategoryListAdapter3方法中的convertView = inflater.inflate(R.layout.your_grid_item_leyout, null);方式：

onPostExecute

最后在TheTask的{{1}}中确实喜欢：

gridView.setAdapter(cla);

那是它。

Answer 5

使用GridView代替以下：

然后替换

listview = (HorizontalListView) this.findViewById(R.id.listview2);

到

GridView gridview;
gridview=(GridView) findViewById(R.id.gridview);

其他一切都很好，只需使用GridView对象设置适配器。你完成了。

如何将listview转换为gridview

5 个答案: