Android GridView

最新推荐文章于 2019-06-16 17:02:53 发布

原创最新推荐文章于 2019-06-16 17:02:53 发布 · 1k 阅读

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本文介绍了一个使用GridView展示学生信息的Android应用实例。通过定义布局文件gridview_student.xml，并在MainActivity中编写Java代码，实现了加载和显示包含ID、姓名及照片的学生信息列表。同时，通过设置点击监听器，可以查看被选中学生的姓名。

1）效果图如下

2）创建GridView的布局xml（gridview_student.xml）具体代码如下

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <TextView
        android:id="@+id/idTextView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="TextView" />

    <TextView
        android:id="@+id/nameTextView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="TextView" />

    <ImageView
        android:id="@+id/photoImageView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/ic_launcher" />

</LinearLayout>

3）修改MainActivity.java代码如下

package com.example.test6;

import java.util.ArrayList;
import java.util.HashMap;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.widget.AdapterView;
import android.widget.GridView;
import android.widget.SimpleAdapter;
import android.widget.Toast;

public class MainActivity extends Activity {

	private GridView gridView1=null;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		gridView1=(GridView)findViewById(R.id.gridView1);
		ArrayList<HashMap<String, Object>> students=getStudents();
		SimpleAdapter adapter=new SimpleAdapter(
				MainActivity.this, 
				students, 
				R.layout.gridview_student, 
				new String[]{"id","name","photo"}, 
				new int[]{R.id.idTextView,R.id.nameTextView,R.id.photoImageView});
		gridView1.setNumColumns(3);
		gridView1.setAdapter(adapter); 
		gridView1.setOnItemClickListener(new GridView.OnItemClickListener(){  
			public void onItemClick(AdapterView<?> parent, View view,int position,long arg3){  
				HashMap<String, Object> selectedItem=(HashMap<String, Object>)parent.getItemAtPosition(position); 
				Toast.makeText(MainActivity.this, selectedItem.get("name").toString(), Toast.LENGTH_SHORT).show();  
			}  
		}); 
	}
	/*生成数据*/
	private ArrayList<HashMap<String, Object>> getStudents(){
		ArrayList<HashMap<String, Object>> items=new ArrayList<HashMap<String,Object>>();
		for(int i=1;i<=30;i++){
			HashMap<String, Object> item=new HashMap<String, Object>();
			item.put("id", i);
			item.put("name", "张三"+i);
			item.put("photo", android.R.drawable.ic_dialog_email);
			items.add(item);
		}
		return items;
	}
	
	@Override
	public 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;
	}

}