给listview添加短按长按事件

其他的文件和上篇使用的文件代码相同，参照上篇的代码即可，

这里展示出更改的代码

PersonDao.java(更改的为add()方法的返回值，以前为boolean，现在改为long)

package com.demo.introductiontothedb.dao; import java.util.ArrayList; import java.util.List; import com.demo.introductiontothedb.PersonDBOpenHelper; import com.demo.introductiontothedb.domain.PersonInfo; import android.content.ContentValues; import android.content.Context; import android.database.Cursor; import android.database.sqlite.SQLiteDatabase; import android.text.TextUtils; public class PersonDao { //增删改查 //javaweb 1.加载jdbc驱动.连接 2.准备sql 3.查询 private PersonDBOpenHelper helper; //任何人使用 dao 都要传递一个上下文 public PersonDao(Context context) { helper = new PersonDBOpenHelper(context); } /** * 添加一条记录 */ public long add(String name,String phone,String address){ SQLiteDatabase db = helper.getWritableDatabase(); // db.execSQL("insert into personInfo (name,phone,address) values (?,?,?)", // new Object[]{name,phone,address}); ContentValues values = new ContentValues(); //map集合 values.put("name", name); values.put("phone", phone); values.put("address", address); long result = db.insert("personInfo", null, values); db.close(); return result; } /** * 根据名字查找一条记录 */ public int find(String name){ int id = -1; SQLiteDatabase db = helper.getReadableDatabase(); // Cursor cursor = db.rawQuery("select id from personInfo where name=?", // new String[]{name}); Cursor cursor = db.query("personInfo", new String[]{"id"}, "name=?", new String[]{name}, null, null, null); if(cursor.moveToFirst()){ id = cursor.getInt(0); } cursor.close(); db.close(); return id; } /** * 删除一条记录 */ public boolean delete(int id){ SQLiteDatabase db = helper.getWritableDatabase(); //db.execSQL("delete from personInfo where id=?", new Object[]{id}); int result = db.delete("personInfo", "id=?", new String[]{id + ""}); db.close(); if(result > 0){ return true; }else{ return false; } } /** * 更改一条记录 */ public boolean update(String name,String phone,int id){ SQLiteDatabase db = helper.getWritableDatabase(); // db.execSQL("update personInfo set name=?,phone=? where id=?", // new Object[]{name,phone,id}); //String table, ContentValues values, String whereClause, String[] whereArgs) ContentValues values = new ContentValues(); values.put("name", name); values.put("phone", phone); int result = db.update("personInfo", values, "id=?", new String[]{id + ""}); db.close(); if(result > 0){ return true; }else{ return false; } } //查找全部 public List<PersonInfo> findAll(){ int money = 0; List<PersonInfo> personInfos = new ArrayList<PersonInfo>(); SQLiteDatabase db = helper.getWritableDatabase(); Cursor cursor = db.query("personInfo", new String[]{"id","name","phone","address","money"}, null, null, null, null, null); while(cursor.moveToNext()){ int id = cursor.getInt(cursor.getColumnIndex("id")); String name = cursor.getString(cursor.getColumnIndex("name")); String phone = cursor.getString(cursor.getColumnIndex("phone")); String address = cursor.getString(cursor.getColumnIndex("address")); String moneyStr = cursor.getString(cursor.getColumnIndex("money")); if(TextUtils.isEmpty(moneyStr)){ money = 0; }else{ money = Integer.parseInt(moneyStr); } PersonInfo personInfo = new PersonInfo(id, name, phone, address, money); personInfos.add(personInfo); } cursor.close(); db.close(); return personInfos; } } 

MainActivity.java(这里添加了短按常按事件，要注意数据库的更新，适配器的更新以及适配器界面的刷新)

package com.demo.introductiontothedb; import java.util.List; import com.demo.introductiontothedb.dao.PersonDao; import com.demo.introductiontothedb.domain.PersonInfo; import android.app.Activity; import android.os.Bundle; import android.view.View; import android.view.View.OnClickListener; import android.view.ViewGroup; import android.widget.AdapterView; import android.widget.AdapterView.OnItemClickListener; import android.widget.AdapterView.OnItemLongClickListener; import android.widget.BaseAdapter; import android.widget.Button; import android.widget.ListView; import android.widget.TextView; import android.widget.Toast; public class MainActivity extends Activity { public static final String TAG = "MainActivity"; private PersonDao personDao; private List<PersonInfo> personInfos; private ListView lv; private MyAdapter adapter; private Button btn_add; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); //1.得到listview lv = (ListView) findViewById(R.id.lv); btn_add = (Button) findViewById(R.id.btn_add); personDao = new PersonDao(this); personInfos = personDao.findAll(); //2.设置listview的数据适配器 adapter = new MyAdapter(); lv.setAdapter(adapter); //添加点击事件 lv.setOnItemClickListener(new OnItemClickListener() { @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { //取出position位置的personInfo对象 PersonInfo personInfo = personInfos.get(position); int personId = personInfo.getId(); Toast.makeText(MainActivity.this, "排名："+personId, 0).show(); } }); //添加长按事件，长按删除一条记录 lv.setOnItemLongClickListener(new OnItemLongClickListener() { @Override public boolean onItemLongClick(AdapterView<?> parent, View view, int position, long id) { PersonInfo personInfo = personInfos.get(position); int personId = personInfo.getId(); //数据库内删除 personDao.delete(personId); //从数据适配器集合里面清除 personInfos.remove(position);//注意，这里要用position... //适配器界面更新 adapter.notifyDataSetChanged(); //false 当前的事件不会被终止掉 //true 当前的事件执行到这里就终止了 return true; } }); //按钮的添加事件 btn_add.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { //数据库添加记录 int id = (int)personDao.add("西野翔", "454845", "某岛国"); //界面的集合 personInfos.add(new PersonInfo(id,"周防雪子","911844","也是岛国", 3000)); //适配器更新 adapter.notifyDataSetChanged(); } }); } //控制器 数据适配器 private class MyAdapter extends BaseAdapter{ //数据适配器里面有多少条数据 @Override public int getCount() { return personInfos.size(); } @Override public Object getItem(int position) { return null; } @Override public long getItemId(int position) { return 0; } //返回当前位置对应的view对象 显示的内容 /** * 与传统写listview比，该方法优势在于，用户 * 在界面上翻看多少listview的内容， * 该方法就会执行多少次，大大的提高了效率节省了资源。 * 不会像传统的不管看还是不看，一次性把personInfos * 里面的全部内容加载到界面上 */ @Override public View getView(int position, View convertView, ViewGroup parent) { //position 代表的是位置 // Log.i(TAG, "getView" + position); // TextView tv = new TextView(MainActivity.this); // PersonInfo personInfo = personInfos.get(position); // tv.setText(personInfo.toString()); // tv.setTextSize(16); // tv.setTextColor(Color.BLUE); // return tv; // 将xml文件创建成一个独立的view对象. View view = View.inflate(MainActivity.this, R.layout.list_view, null); // 从刚才转化出来的view对象里面寻找name //注意，一定从刚刚转换的view里面找,MainActivity里面可没有这textview TextView name = (TextView)view.findViewById(R.id.name); // 从刚才转化出来的view对象里面寻找phone TextView phone = (TextView)view.findViewById(R.id.phone); // 从刚才转化出来的view对象里面寻找address TextView address = (TextView)view.findViewById(R.id.address); //从刚才转化出来的view对象里面寻找money TextView money = (TextView)view.findViewById(R.id.money); //得到该positiion位置的一个personinfo对象 PersonInfo personInfo = personInfos.get(position); //绑定每个条目控件的信息 name.setText(personInfo.getName()); phone.setText(personInfo.getPhone()); address.setText(personInfo.getAddress()); money.setText("$:"+personInfo.getMoney()); return view; } } }