andorid 练习之黑名单

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.hanqi.blacklist.MianActivity"
android:orientation="vertical">

<ListView
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:id="@android:id/list"
>
</ListView>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@android:id/empty"
android:layout_weight="1"
android:gravity="center"
android:text="还没有一个黑名单"/>
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="添加"
android:onClick="bt1_onclick"/>
</LinearLayout>

package com.hanqi.blacklist;

import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.util.Log;

/**
* Created by Administrator on 2016/4/15.
*/
public class DBHelper extends SQLiteOpenHelper {
public DBHelper(Context context) {
super(context,"blacklist.db", null, 1);
}

@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL("create table black_number (_id integer primary key autoincrement, phone_nubmer varchar)");

Log.e("TAG","onCreate");

}

@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {

}
}

package com.hanqi.blacklist;

/**
* Created by Administrator on 2016/4/15.
*/
public class BlackNumber  {
private long id;
private String phonenumber;

public long getId() {
return id;
}

public void setId(long id) {
this.id = id;
}

public String getPhonenumber() {
return phonenumber;
}

public void setPhonenumber(String phonenumber) {
this.phonenumber = phonenumber;
}

public BlackNumber() {
}

public BlackNumber(long id, String phonenumber) {
this.id = id;
this.phonenumber = phonenumber;
}

public BlackNumber(String phonenumber) {
this.phonenumber = phonenumber;
}

@Override
public String toString() {
return "BlackNumber{" +
"id=" + id +
", phonenumber='" + phonenumber + '\'' +
'}';
}
}

package com.hanqi.blacklist;

import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.util.Log;

import java.util.ArrayList;
import java.util.List;

/**
* Created by Administrator on 2016/4/15.
*/
public class BlackNumberDAO {

private DBHelper dbHelper;
//初始化工具类
public BlackNumberDAO(Context context)
{
dbHelper = new DBHelper(context);
}

//增
public void insert(BlackNumber blackNumber)
{
//获取数据库连接
SQLiteDatabase sql = dbHelper.getWritableDatabase();
//要添加数据的键值对集合
ContentValues contentValues =new ContentValues();

contentValues.put("phone_number",blackNumber.getPhonenumber());
//数据添加
sql.insert("black_number",null,contentValues);
//关闭数据库
sql.close();

Log.e("TAG","添加数据成功");

}
//删除
public void delete(long id)
{
//获取数据库连接
SQLiteDatabase sql = dbHelper.getWritableDatabase();

//数据删除
sql.delete("black_number","_id=?",new String[]{String.valueOf(id)});
//关闭数据库
sql.close();

Log.e("TAG","删除数据成功");

}
//改
public void update(BlackNumber blackNumber)
{
//获取数据库连接
SQLiteDatabase sql = dbHelper.getWritableDatabase();
//要添加数据的键值对集合
ContentValues contentValues =new ContentValues();

contentValues.put("phone_number", blackNumber.getPhonenumber());
//数据修改
sql.update("black_number",contentValues,"_id=?",new String[]{String.valueOf(blackNumber.getId())});
//关闭数据库
sql.close();

Log.e("TAG","修改数据成功");

}
//查
//用list<实体类的实例>返回数据
public List<BlackNumber> getAll()
{
List<BlackNumber> rtn = new ArrayList<BlackNumber>();
//查询数据

//获取数据库连接
SQLiteDatabase sql = dbHelper.getWritableDatabase();
//返回游标
Cursor cursor = sql.query("black_number", null, null, null, null, null, "_id desc");
//移动游标，获取数据
while (cursor.moveToNext())
{
//构造实体类的实例，放入List
rtn.add(new BlackNumber(cursor.getLong(0),cursor.getString(1)));

}
Log.e("TAg","记录条数 = "+cursor.getCount());

sql.close();
return rtn;
}

}

package com.hanqi.blacklist;

import android.app.AlertDialog;
import android.app.ListActivity;
import android.content.DialogInterface;
import android.os.Bundle;
import android.text.InputType;
import android.view.ContextMenu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

import java.util.List;

public class MianActivity extends ListActivity {

private ListView lv1;
private List<BlackNumber> data;
private BlackListAdapter dla;
private int position;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_mian);
//lv1 = (ListView)findViewById(R.id.lv_1);
lv1 = getListView();
//获取数据集合
BlackNumberDAO bd = new BlackNumberDAO(this);

data = bd.getAll();

dla = new BlackListAdapter();
//设置适配器
lv1.setAdapter(dla);
//设置上下文菜单的监听
lv1.setOnCreateContextMenuListener(this);
}
//上下文菜单被点击
@Override
public boolean onContextItemSelected(MenuItem item) {
final BlackNumber bn =data.get(position);
switch (item.getItemId())
{
case 0://修改
final EditText et = new EditText(this);
et.setInputType(InputType.TYPE_CLASS_PHONE);
et.setText(bn.getPhonenumber());
//弹出对话框
new AlertDialog.Builder(this)
.setTitle("修改黑名单")
.setView(et)
.setNeutralButton("取消",null)
.setPositiveButton("保存", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
//获取修改后的值
bn.setPhonenumber(et.getText().toString());
//执行数据库修改操作
BlackNumberDAO  bnd = new BlackNumberDAO(MianActivity.this);

bnd.update(bn);
//更新集合

//bn和data里面的对象，指向同一个内存地址
//如果bn 被修改了， data里面的对象也同时
//这就是引用类型的特点
//通知刷新列表
dla.notifyDataSetChanged();
Toast.makeText(MianActivity.this, "修改成功", Toast.LENGTH_SHORT).show();
}
})

.show();
break;
case 1://删除
BlackNumberDAO bd = new BlackNumberDAO(this);

//需要id 数据库删除了
bd.delete(bn.getId());
//刷新界面
data.remove(position);
//通知刷新
dla.notifyDataSetChanged();
break;

}
return super.onContextItemSelected(item);

}

//创建上下文菜单
public void onCreateContextMenu(ContextMenu menu,View v,ContextMenu.ContextMenuInfo menuInfo)
{
super.onCreateContextMenu(menu, v, menuInfo);
menu.add(0, 0, 0, "修改");

menu.add(0,1,1,"修改");
//获取长按的适配器信息
AdapterView.AdapterContextMenuInfo acm = (AdapterView.AdapterContextMenuInfo)menuInfo;
position=acm.position;
}
//列表的适配器
class BlackListAdapter extends BaseAdapter
{
@Override
public int getCount() {
return data.size();
}

@Override
public Object getItem(int position) {
return data.get(position);
}

@Override
public long getItemId(int position) {
return data.get(position).getId();
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
//判断可复用的视图是否为空
if(convertView == null)
{
//获取视图
convertView = View.inflate(MianActivity.this,android.R.layout.simple_list_item_1,null);
}
//给视图绑定视图
TextView tv = (TextView)convertView.findViewById(android.R.id.text1);

tv.setText(data.get(position).getPhonenumber());

return convertView;
}
}

public void bt1_onclick(View v)
{
final EditText editText =  new EditText(this);
editText.setHint("输入电话号码");
//editText.setLayoutParams(new ActionBar.LayoutParams());
editText.setInputType(InputType.TYPE_CLASS_PHONE);
//构造在定义对话框
new AlertDialog.Builder(this)
.setTitle("添加黑名单")
.setView(editText)
.setNeutralButton("取消",null)
.setPositiveButton("保存", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
//构造实体类
BlackNumber blackNumber = new BlackNumber(editText.getText().toString());
//调用DAO类，保存数据
BlackNumberDAO blackNumberDAO = new BlackNumberDAO(MianActivity.this);

blackNumberDAO.insert(blackNumber);
//添加数据到集合数据集合的顶部
data.add(0,blackNumber);
//通知适配器刷新ListView
dla.notifyDataSetChanged();
Toast.makeText(MianActivity.this, "数据保存成功", Toast.LENGTH_SHORT).show();
}
})
.show();
}
}