Basic use of GridView (grid view)


Introduction to this section:

This section introduces you to the second Adapter class control - GridView (grid view). As the name suggests, ListView is a list. GridView is to display the grid! Like ListView, it is a subclass of AbsListView! Many things are similar to ListView. In this section we will learn its basic usage~

1. Related properties:

The following are some properties in GridView:

  • android:columnWidth: Set the width of the column
  • android:gravity: How the component aligns
  • android:horizontalSpacing : The spacing of each cell in the horizontal direction
  • android:verticalSpacing: The spacing of each cell in the vertical direction
  • android:numColumns: Set the number of columns
  • android:stretchMode: Set the stretching mode, the optional values ​​are as follows: none: No stretching; spacingWidth : Stretch the spacing between elements columnWidth: Stretch only the table element itself spacingWidthUniform: Stretch both the spacing between elements and the spacing between them

2. Usage example:

Let’s get familiar with the use of this control through a simple example: (For the Adapter used here, we directly use the reusable BaseAdapter taught in 2.5.0~)

Rendering of the implementation:

1.gif

Code implementation:

The first is the layout of the Item of the GridView: item_grid_icon.xml:

<?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:padding="5dp">

    <ImageView
        android:id="@+id/img_icon"
        android:layout_width="64dp"
        android:layout_height="64dp"
        android:layout_centerInParent="true"
        android:src="@mipmap/iv_icon_1" />

    <TextView
        android:id="@+id/txt_icon"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@id/img_icon"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="30dp"
        android:text="呵呵"
        android:textSize="18sp" />
        
</RelativeLayout>

接着我们写个entity实体类：Icon.java：

/**
 * Created by Jay on 2015/9/24 0024.
 */
public class Icon {
    private int iId;
    private String iName;

    public Icon() {
    }

    public Icon(int iId, String iName) {
        this.iId = iId;
        this.iName = iName;
    }

    public int getiId() {
        return iId;
    }

    public String getiName() {
        return iName;
    }

    public void setiId(int iId) {
        this.iId = iId;
    }

    public void setiName(String iName) {
        this.iName = iName;
    }
}

Finally, the layout of MainActivity and Java code

activity_main.xml:

public class MainActivity extends AppCompatActivity {

    private Context mContext;
    private GridView grid_photo;
    private BaseAdapter mAdapter = null;
    private ArrayList<Icon> mData = null;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mContext = MainActivity.this;
        grid_photo = (GridView) findViewById(R.id.grid_photo);

        mData = new ArrayList<Icon>();
        mData.add(new Icon(R.mipmap.iv_icon_1, "图标1"));
        mData.add(new Icon(R.mipmap.iv_icon_2, "图标2"));
        mData.add(new Icon(R.mipmap.iv_icon_3, "图标3"));
        mData.add(new Icon(R.mipmap.iv_icon_4, "图标4"));
        mData.add(new Icon(R.mipmap.iv_icon_5, "图标5"));
        mData.add(new Icon(R.mipmap.iv_icon_6, "图标6"));
        mData.add(new Icon(R.mipmap.iv_icon_7, "图标7"));

        mAdapter = new MyAdapter<Icon>(mData, R.layout.item_grid_icon) {
            @Override
            public void bindView(ViewHolder holder, Icon obj) {
                holder.setImageResource(R.id.img_icon, obj.getiId());
                holder.setText(R.id.txt_icon, obj.getiName());
            }
        };

        grid_photo.setAdapter(mAdapter);

        grid_photo.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                Toast.makeText(mContext, "你点击了~" + position + "~项", Toast.LENGTH_SHORT).show();
            }
        });

    }

}

MainActivity.java：

public class MainActivity extends AppCompatActivity {

    private Context mContext;
    private GridView grid_photo;
    private BaseAdapter mAdapter = null;
    private ArrayList<Icon> mData = null;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mContext = MainActivity.this;
        grid_photo = (GridView) findViewById(R.id.grid_photo);

        mData = new ArrayList<Icon>();
        mData.add(new Icon(R.mipmap.iv_icon_1, "图标1"));
        mData.add(new Icon(R.mipmap.iv_icon_2, "图标2"));
        mData.add(new Icon(R.mipmap.iv_icon_3, "图标3"));
        mData.add(new Icon(R.mipmap.iv_icon_4, "图标4"));
        mData.add(new Icon(R.mipmap.iv_icon_5, "图标5"));
        mData.add(new Icon(R.mipmap.iv_icon_6, "图标6"));
        mData.add(new Icon(R.mipmap.iv_icon_7, "图标7"));

        mAdapter = new MyAdapter<Icon>(mData, R.layout.item_grid_icon) {
            @Override
            public void bindView(ViewHolder holder, Icon obj) {
                holder.setImageResource(R.id.img_icon, obj.getiId());
                holder.setText(R.id.txt_icon, obj.getiName());
            }
        };

        grid_photo.setAdapter(mAdapter);

        grid_photo.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                Toast.makeText(mContext, "你点击了~" + position + "~项", Toast.LENGTH_SHORT).show();
            }
        });

    }

}

嗯，代码非常简单~

3.示例代码下载：

GridViewDemo1.zip

本节小结：

本节给大家介绍了第二个需要使用Adapter的UI控件——网格视图GridView，用法很简单~ 大家可以根据自己的需求进行扩展，比如用GridView显示手机相册~嗯，就说这么多， 谢谢~