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~
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
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:
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="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;
}
}
最后是MainActivity的布局以及Java代码
activity_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: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~
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~