GridView--学习

GridView：网络视图

按照行、列分布的方式来显示多个组件，通常用于显示图片或图片等。

在xml布局文件中添加的网络视图(GridView)的基本语法如下：

<GridView

属性列表例：

android:id="@+id/gridView1"           android:layout_width="wrap_content"        android:layout_height="wrap_content"android:columnWidth="90dp"android:numColumns="3"android:verticalSpacing="10dp"android:horizontalSpacing="10dp"android:stretchMode="columnWidth"android:gravity="center"

</GridView>

·GridView 常用属性：

XML属性	描述
android:columnWidth	用于设置列的宽度
android:gravity	用于设置对齐方式
android:horizontalSpacing	用于设置各元素之间的水平间距
android:numColumns	用于设置列数，其属性值通常为大于的值，如果只有一列，那么最好使用ListView实现
android:stretchMode	用于设置拉伸模式，其中属性值可以是none（不拉伸）、spacingWidth（仅拉伸元素之间的间距）、columnWidth（仅拉伸表格元素本身）或spacingWidthUniform（表格元素本身、元素之间的间距一起拉伸）
android:verticalSpacing	用于设置各元素之间的垂直间距

·具体Demo

Demo效果-->01：

Demo代码：

res/layout:activity_main.xml:

<LinearLayout 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:orientation="vertical"    android:background="#000000">    <GridView         android:id="@+id/gridView1"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:columnWidth="90dp"        android:numColumns="3"        android:verticalSpacing="10dp"        android:horizontalSpacing="10dp"        android:stretchMode="columnWidth"        android:gravity="center"></GridView></LinearLayout>

自定义适配器

MyAdapter:(继承BaseAdapter )

package com.example.gridview;import android.content.Context;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.GridLayout;import android.widget.GridView;import android.widget.ImageView;public class MyAdapter extends BaseAdapter {//上下文对象private Context context;//图片数组private int[] image = { R.drawable.ic_menu_directions,R.drawable.ic_menu_edit, R.drawable.ic_menu_emoticons,R.drawable.ic_menu_end_conversation, R.drawable.ic_menu_find,R.drawable.ic_menu_find_holo_light, R.drawable.ic_menu_forward,R.drawable.ic_menu_friendslist, R.drawable.ic_menu_gallery,R.drawable.ic_menu_goto, R.drawable.ic_menu_help,R.drawable.ic_menu_home, R.drawable.ic_menu_info_details,R.drawable.ic_menu_invite, R.drawable.ic_menu_login,R.drawable.ic_menu_edit, R.drawable.ic_menu_emoticons,R.drawable.ic_menu_end_conversation, R.drawable.ic_menu_find,R.drawable.ic_menu_find_holo_light, R.drawable.ic_menu_forward,R.drawable.ic_menu_info_details, R.drawable.ic_menu_invite,R.drawable.ic_menu_login };public MyAdapter(Context context) {// TODO Auto-generated constructor stubthis.context = context ;}@Overridepublic int getCount() {// TODO Auto-generated method stubreturn image.length;}@Overridepublic Object getItem(int arg0) {// TODO Auto-generated method stubreturn arg0;}@Overridepublic long getItemId(int arg0) {// TODO Auto-generated method stubreturn arg0;}//创建View方法@Overridepublic View getView(int position, View contentView, ViewGroup parent) {// TODO Auto-generated method stubImageView imageView ; if (contentView == null ) {imageView = new ImageView(context) ;imageView.setLayoutParams(new GridView.LayoutParams(75,75));//设置ImageView对象布局imageView.setAdjustViewBounds(false) ;//设置边界对齐//设置刻度的类型imageView.setScaleType(ImageView.ScaleType.CENTER_CROP) ;//设置间距imageView.setPadding(8, 8, 8, 8) ;}else {imageView = (ImageView) contentView ;}imageView.setImageResource(image[position]) ;//为ImageView设置图片资源return imageView;}}

MainActivity:

package com.example.gridview;import android.app.Activity;import android.os.Bundle;import android.view.Menu;import android.view.View;import android.widget.AdapterView;import android.widget.AdapterView.OnItemClickListener;import android.widget.GridView;import android.widget.Toast;public class MainActivity extends Activity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);GridView gridView = (GridView) findViewById(R.id.gridView1) ;//为GridView设置适配器gridView.setAdapter(new MyAdapter(this)) ;//注册监听事件gridView.setOnItemClickListener(new OnItemClickListener() { @Overridepublic void onItemClick(AdapterView<?> parent, View view, int position,long id) {// TODO Auto-generated method stubToast.makeText(MainActivity.this, "pic" + position, Toast.LENGTH_LONG).show() ;}}) ;}@Overridepublic boolean onCreateOptionsMenu(Menu menu) {// Inflate the menu; this adds items to the action bar if it is present.getMenuInflater().inflate(R.menu.main, menu);return true;}}

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