Android控件之GridView探究

浏览数：29 / 时间：2015年06月11日

GridView是一项显示二维的viewgroup，可滚动的网格。一般用来显示多张图片。

以下模拟九宫图的实现，当鼠标点击图片时会进行相应的跳转链接。

目录结构

main.xml布局文件，存放GridView控件

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

<GridView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/gridview"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:numColumns="auto_fit"
android:verticalSpacing="10dp"
android:horizontalSpacing="10dp"
android:columnWidth="90dp"
android:stretchMode="columnWidth"
android:gravity="center"
/>

night_item.xml布局文件，存放显示控件

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_height="wrap_content"
android:paddingBottom="4dip"
android:layout_width="fill_parent">
<ImageView android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:layout_centerHorizontal="true"
android:id="@+id/itemImage">
</ImageView>
<TextView android:layout_width="wrap_content"
android:layout_below="@+id/itemImage"
android:layout_height="wrap_content"
android:text="TextView01"
android:layout_centerHorizontal="true"
android:id="@+id/itemText">
</TextView>
</RelativeLayout>

strings.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
<string name="hello">Hello World, GvActivity!</string>
<string name="app_name">九宫图</string>
<string name="test_name1">跳转到TestActivity1</string>
<string name="test_name2">跳转到TestActivity2</string>
<string name="test_name3">跳转到TestActivity3</string>
</resources>

清单文件

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.ljq.gv"
android:versionCode="1"
android:versionName="1.0">
<application android:icon="@drawable/icon" android:label="@string/app_name">
<activity android:name=".GvActivity"
android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN"/>
<category android:name="android.intent.category.LAUNCHER"/>
</intent-filter>
</activity>
<activity android:name=".TestActivity1" android:label="@string/test_name1"/>
<activity android:name=".TestActivity2" android:label="@string/test_name2"/>
<activity android:name=".TestActivity3" android:label="@string/test_name3"/>
</application>
<uses-sdk android:minSdkVersion="7"/>

</manifest>

跳转类TestActivity1、TestActivity2、TestActivity3

package com.ljq.gv;

import android.app.Activity;
import android.os.Bundle;

publicclass TestActivity1 extends Activity {

@Override
publicvoid onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//setContentView(R.layout.main);
}
}

package com.ljq.gv;

import android.app.Activity;
import android.os.Bundle;

publicclass TestActivity2 extends Activity {

@Override
publicvoid onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//setContentView(R.layout.main);
}
}

package com.ljq.gv;

import android.app.Activity;
import android.os.Bundle;

publicclass TestActivity3 extends Activity {

@Override
publicvoid onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//setContentView(R.layout.main);
}
}

类GvActivity

package com.ljq.gv;

import java.util.ArrayList;
import java.util.HashMap;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.GridView;
import android.widget.SimpleAdapter;
import android.widget.Toast;
import android.widget.AdapterView.OnItemClickListener;

publicclass GvActivity extends Activity {
private String texts[] =null;
privateint images[] =null;

publicvoid onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);

images=newint[]{R.drawable.p1, R.drawable.p2,
R.drawable.p3, R.drawable.p4,
R.drawable.p5,R.drawable.p6,
R.drawable.p7,R.drawable.p8};
texts =new String[]{ "宫式布局1", "宫式布局2",
"宫式布局3", "宫式布局4",
"宫式布局5", "宫式布局6",
"宫式布局7", "宫式布局8"};

GridView gridview = (GridView) findViewById(R.id.gridview);
ArrayList<HashMap<String, Object>> lstImageItem =new ArrayList<HashMap<String, Object>>();
for (int i =0; i <8; i++) {
HashMap<String, Object> map =new HashMap<String, Object>();
map.put("itemImage", images[i]);
map.put("itemText", texts[i]);
lstImageItem.add(map);
}

SimpleAdapter saImageItems =new SimpleAdapter(this,
lstImageItem,// 数据源
R.layout.night_item,// 显示布局
new String[] { "itemImage", "itemText" },
newint[] { R.id.itemImage, R.id.itemText });
gridview.setAdapter(saImageItems);
gridview.setOnItemClickListener(new ItemClickListener());
}

class ItemClickListener implements OnItemClickListener {
/**
* 点击项时触发事件
*
* @param parent 发生点击动作的AdapterView
* @param view 在AdapterView中被点击的视图(它是由adapter提供的一个视图)。
* @param position 视图在adapter中的位置。
* @param rowid 被点击元素的行id。
*/
publicvoid onItemClick(AdapterView<?> parent, View view, int position, long rowid) {
HashMap<String, Object> item = (HashMap<String, Object>) parent.getItemAtPosition(position);
//获取数据源的属性值
String itemText=(String)item.get("itemText");
Object object=item.get("itemImage");
Toast.makeText(GvActivity.this, itemText, Toast.LENGTH_LONG).show();

//根据图片进行相应的跳转
switch (images[position]) {
case R.drawable.p1:
startActivity(new Intent(GvActivity.this, TestActivity1.class));//启动另一个Activity
finish();//结束此Activity，可回收
break;
case R.drawable.p2:
startActivity(new Intent(GvActivity.this, TestActivity2.class));
finish();
break;
case R.drawable.p3:
startActivity(new Intent(GvActivity.this, TestActivity3.class));
finish();
break;
}

}
}
}

运行结果