【实例简介】

【实例截图】

【核心代码】

import java.util.ArrayList;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

import android.app.Activity;

import android.content.Intent;

import android.os.Bundle;

import android.view.ContextMenu;

import android.view.ContextMenu.ContextMenuInfo;

import android.view.MenuItem;

import android.view.View;

import android.view.View.OnCreateContextMenuListener;

import android.widget.AdapterView.AdapterContextMenuInfo;

import android.widget.ListView;

import android.widget.SimpleAdapter;

import android.widget.Toast;

import com.domain.Student;

import com.service.PersonService;

public class ShowActivity extends Activity {

private ListView list_students;

private List students;

private List> data;

private String[] dataFrom = new String[] { "item_id", "item_name",

"item_number", "item_age" };

private int[] dataTo = new int[] { R.id.item_id, R.id.item_name,

R.id.item_number, R.id.item_age };

private PersonService service;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.show_layout);

//数据显示

list_students = (ListView) findViewById(R.id.list_show);

service = new PersonService(getApplicationContext());

try {

students = service.getAllData();

} catch (Exception e) {

e.printStackTrace();

}

data = getData(students);

SimpleAdapter adapter = new SimpleAdapter(this,data, R.layout.item_layout, dataFrom, dataTo);

list_students.setAdapter(adapter);

registerForContextMenu(list_students);//设置上下文菜单监听事件

//设置上下文菜单监听事件的第二种方式

/*list_students

.setOnCreateContextMenuListener(new OnCreateContextMenuListener() {

@Override

public void onCreateContextMenu(ContextMenu menu, View v,

ContextMenuInfo menuInfo) {

System.out.println("24141");

menu.setHeaderTitle("操作");

menu.add(0, 0, 0, "修改记录");

menu.add(0, 1, 0, "删除记录");

}

});*/

}

@Override

public void onCreateContextMenu(ContextMenu menu, View v,

ContextMenuInfo menuInfo) {

menu.setHeaderTitle("操作");

menu.add(0, 0, 0, "修改记录");

menu.add(0, 1, 0, "删除记录");

}

/**

* 为菜单添加事件

*/

@Override

public boolean onContextItemSelected(MenuItem item) {

try {

AdapterContextMenuInfo info = (AdapterContextMenuInfo) item.getMenuInfo();

int p = info.position;

Map m = data.get(p);

String item_id = (String) m.get("item_id");

System.out.println("find*************");

switch (item.getItemId()) {

case 0:

System.out.println("find");

find(item_id);

return true;

case 1:

delete(item_id);

return true;

default:

System.out.println("-----up---------");

return super.onContextItemSelected(item);

}

} catch (Exception e) {

return super.onContextItemSelected(item);

}

}

/**

* Activity的resume事件

*/

@Override

protected void onResume() {

super.onResume();

try {

students = service.getAllData();

} catch (Exception e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

data = getData(students);

SimpleAdapter adapter = new SimpleAdapter(getApplicationContext(),

data, R.layout.item_layout, dataFrom, dataTo);

list_students.setAdapter(adapter);

}

/**

* 数据删除

*

* @param id

* @throws Exception

*/

public void delete(String item_id) {

try {

service.delete(item_id);

Toast.makeText(getApplicationContext(), "数据：" item_id " 删除成功！",

Toast.LENGTH_SHORT).show();

onResume();

} catch (Exception e) {

Toast.makeText(getApplicationContext(), "数据：" item_id " 删除失败！",

Toast.LENGTH_SHORT).show();

e.printStackTrace();

}

}

/**

* 数据更新

*

* @param id

* @throws Exception

*/

public void find(String item_id) throws Exception {

Toast.makeText(getApplicationContext(), "数据：" item_id " 更新成功！",

Toast.LENGTH_SHORT).show();

System.out.println("-----up---------");

Student student = service.find(item_id);

Bundle bundle = new Bundle();

bundle.putSerializable("stu", student);

Intent intent = new Intent(this, UpdataActivity.class);

intent.putExtras(bundle);

startActivity(intent);

}

/**

* 数据获取

*

* @param stus

*

*/

private List> getData(List stus) {

List> da = new ArrayList>();

for (int i = 0; i < stus.size(); i ) {

Student stu = students.get(i);

Map map = new HashMap();

map.put("item_id", stu.getId());

map.put("item_name", stu.getName());

map.put("item_number", stu.getNumber());

map.put("item_age", stu.getAge());

da.add(map);

}

return da;

}

}