九宫格

主页面，添加一个GridView

新建一个item

功能实现

package cn.edu.niit.nine;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.GridView;
import android.widget.SimpleAdapter;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map;

public class MainActivity extends AppCompatActivity {

GridView gv;
//将图片Id放入数组中去
int []imageIds = new int[] {
R.drawable.g1,R.drawable.g2, R.drawable.g3,
R.drawable.g4,R.drawable.g5, R.drawable.g6,
R.drawable.g7,R.drawable.g8, R.drawable.g9
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

list();
//定义一个list来存放多个item元素
ArrayList<Map<String, Object>> listItems = new ArrayList<Map<String,Object>>();
for (int i = 0; i < imageIds.length; i++) {
Map<String, Object> item = new HashMap<>();
item.put("image", imageIds[i]);
listItems.add(item);
}
//创建simpleAdapter来设置元素
SimpleAdapter adapter = new SimpleAdapter(this, listItems, R.layout.item,
new String[] {"image"}, new int[] {R.id.image});
gv.setAdapter(adapter);

}

private void list() {
gv = (GridView)findViewById(R.id.gridview);
}

}

实现图