本节引言:

本节给大家介绍的是第二个Adapter类的控件——GridView(网格视图),见名知义,ListView是列表,GridView就是显示网格!他和ListView一样是AbsListView的子类!很多东西和ListView都是相通的,本节我们就来学习他的基本用法~


1.相关属性:

下面是GridView中的一些属性:

  • android:columnWidth:设置列的宽度
  • android:gravity:组件对其方式
  • android:horizontalSpacing:水平方向每个单元格的间距
  • android:verticalSpacing:垂直方向每个单元格的间距
  • android:numColumns:设置列数
  • android:stretchMode:设置拉伸模式,可选值如下:none:不拉伸;spacingWidth:拉伸元素间的间隔空隙columnWidth:仅仅拉伸表格元素自身spacingWidthUniform:既拉元素间距又拉伸他们之间的间隔空袭

2.使用示例:

下面通过一个简单的例子来熟悉这个控件的使用:(这里用的Adapter我们直接用之2.5.0中教大家写的可复用的BaseAdapter~)

实现的效果图

2.5.2 GridView(网格视图)的基本使用

代码实现

首先是GridView 的 Item的布局:item_grid_icon.xml:

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="https://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;    }}

最后是MainActivity的布局以及Java代码

activity_main.xml

<RelativeLayout xmlns:android="https://schemas.android.com/apk/res/android"    xmlns:tools="https://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:padding="5dp"    tools:context=".MainActivity">        <!--numColumns设置每行显示多少个-->    <GridView        android:id="@+id/grid_photo"        android:layout_width="match_parent"        android:layout_height="match_parent"        android:numColumns="3" /></RelativeLayout>

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~