Android——黑名单管理（二）

说明：多加一点完善

1.在操作类 DAO 将连接数据库也放到了构造方法中（错误），加删除全部的方法

2.主界面增加了姓名一栏，用layout文件将对话框分离出来

3.删除加确认提示

4.加删除全部按钮

BlackNumber.java

package com.example.chenshuai.test321;

/**
 * Created by chenshuai on 2016/4/16.
 */
//实体类 只负责装载数据
public class BlackNumber {

    private long id;
    private String name;
    private String phonenumber;

    //生成get和set方法
    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    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;
    }

    //生成构造方法
    public BlackNumber() {
    }

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

    public BlackNumber(long id,String name,String phonenumber) {

        this.id = id;
        this.name = name;
        this.phonenumber = phonenumber;
    }

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

BlackNumberDAO.java

package com.example.chenshuai.test321;

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 chenshuai on 2016/4/16.
 */
//数据库操作类
public class BlackNumberDAO {

    private DBHelper dbHelper;

    //构造方法 初始化 操作工具类DBHelper 连接数据库
    public BlackNumberDAO(Context context)
    {
        dbHelper = new DBHelper(context);
    }

    //增
    public void insert(BlackNumber blackNumber)
    {
        //连接数据库
        SQLiteDatabase sd = dbHelper.getWritableDatabase();

        //添加数据
        ContentValues cv = new ContentValues();

        //要添加数据的键值对集合
        cv.put("name",blackNumber.getName());
        cv.put("phone_number",blackNumber.getPhonenumber());

        //数据添加
        sd.insert("black_number",null,cv);

        //关闭数据库
        sd.close();

        Log.e("TAG", "添加数据成功");
    }

    //查询
    //用List<实体类的实例>返回数据
    public List<BlackNumber> getAll()
    {
        //连接数据库
        SQLiteDatabase sd = dbHelper.getWritableDatabase();
        //List 接口 ArrayList 实现类
        List<BlackNumber> bln = new ArrayList<BlackNumber>();
        //查询数据
        //连接数据库
        //SQLiteDatabase sd = dbHelper.getWritableDatabase();

        //返回游标
        Cursor cursor = sd.query("black_number", null, null, null, null, null, "_id desc");

        //遍历 移动游标，获取数据
        while (cursor.moveToNext())
        {
            //构造实体类的实例,放入List
            bln.add(new BlackNumber(cursor.getLong(0),cursor.getString(1),cursor.getString(2)));

        }
        Log.e("TAG", "数据的记录条数" + cursor.getCount());
        sd.close();
        return bln;
    }

    //改
    public void update(BlackNumber blackNumber)
    {
        //连接数据库
        SQLiteDatabase sd = dbHelper.getWritableDatabase();
        //要添加数据的键值对集合
        ContentValues cv = new ContentValues();
        cv.put("name",blackNumber.getName());
        cv.put("phone_number",blackNumber.getPhonenumber());

        sd.update("black_number",cv,"_id=?",new String[]{String.valueOf(blackNumber.getId())});

        sd.close();

        Log.e("TAG", "修改数据成功");
    }

    //删
    public void delete(long id)
    {
        //连接数据库
        SQLiteDatabase sd = dbHelper.getWritableDatabase();
        //删除数据
        sd.delete("black_number", "_id=?", new String[]{String.valueOf(id)});

        sd.close();

        Log.e("TAG", "删除数据成功");
    }

    //全部删除
    public void deleteAll()
    {
        //连接数据库
        SQLiteDatabase sd = dbHelper.getWritableDatabase();
        //删除全部数据
        sd.delete("black_number",null,null);
        sd.close();
        Log.e("TAG", "删除数据成功");

    }
}

activity_activity_black_number.xml

<?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.example.chenshuai.test321.Activity_blackNumber"
    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:id="@android:id/empty"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"
        android:text="还没有一个黑名单"
        android:textSize="30sp"
        android:gravity="center"/>

    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="添加"
        android:textSize="20sp"
        android:onClick="tianjiaonclick"/>

    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="全部删除"
        android:textSize="20sp"
        android:onClick="quanbusconclick"/>

</LinearLayout>

layout_duihuakuang.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <TextView
        android:layout_width="match_parent"
        android:layout_height="60dp"
        android:text="添加黑名单"
        android:textSize="30dp"
        android:gravity="center_vertical"
        android:paddingLeft="20dp"
        android:id="@+id/tv_bt_1"/>
    <EditText
        android:layout_width="match_parent"
        android:layout_height="60dp"
        android:hint="输入姓名"
        android:textSize="20dp"
        android:gravity="center_vertical"
        android:paddingLeft="10dp"
        android:id="@+id/et_bt_1"
        android:inputType="text"
        />
    <EditText
        android:layout_width="match_parent"
        android:layout_height="60dp"
        android:hint="输入黑名单号"
        android:textSize="20dp"
        android:gravity="center_vertical"
        android:paddingLeft="10dp"
        android:id="@+id/et_bt_2"
        android:inputType="number"
        />

</LinearLayout>

layout_blacknumber_xianshi.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <TextView
        android:layout_width="match_parent"
        android:layout_height="40dp"
        android:text="显示姓名"
        android:textSize="25sp"
        android:id="@+id/tv_bt_2"
        android:gravity="center_vertical"
        android:paddingLeft="10dp"
        android:layout_marginTop="10dp"
        android:background="#ADADAD"
        />
    <TextView
        android:layout_width="match_parent"
        android:layout_height="40dp"
        android:text="显示电话"
        android:textSize="20sp"
        android:id="@+id/tv_bt_3"
        android:gravity="center_vertical"
        android:paddingLeft="10dp"
        android:background="#e0e0e0"
        />

</LinearLayout>

 Activity_blackNumber.java

package com.example.chenshuai.test321;

import android.app.AlertDialog;
import android.app.ListActivity;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.ContextMenu;
import android.view.LayoutInflater;
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 Activity_blackNumber extends ListActivity {

    private List<BlackNumber> data;
    private listviewAdapter lad;
    private int position;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_activity_black_number);

        ListView lv_1 = getListView();

        //构建数据
        BlackNumberDAO bln = new BlackNumberDAO(Activity_blackNumber.this);

        data = bln.getAll();

        //适配器
        lad = new listviewAdapter();
        lv_1.setAdapter(lad);

        //设置上下文菜单
        lv_1.setOnCreateContextMenuListener(this);

    }

    //创建上下文菜单
    @Override
    public void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo) {
        //添加两个item
        menu.add(0,1,1,"修改");
        menu.add(0, 2, 2, "删除");

        //获取长按的适配器信息(删除要用)
        AdapterView.AdapterContextMenuInfo menuInfo1 = (AdapterView.AdapterContextMenuInfo)menuInfo;
        position = menuInfo1.position;

        super.onCreateContextMenu(menu, v, menuInfo);
    }

    //给选项加点击事件
    @Override
    public boolean onContextItemSelected(MenuItem item) {

        final BlackNumber bt = data.get(position);

        switch (item.getItemId())
        {
            //修改
            case 1:
                LayoutInflater inflater = getLayoutInflater();
                final View v  = inflater.inflate(R.layout.layout_duihuakuang, null);

                final EditText et_1 = (EditText)v.findViewById(R.id.et_bt_1);
                final EditText et_2 = (EditText)v.findViewById(R.id.et_bt_2);

                //获取默认值
                et_1.setText(bt.getName());
                et_2.setText(bt.getPhonenumber());

                new AlertDialog.Builder(this)
                        .setView(v)
                        .setNegativeButton("取消",null)
                        .setPositiveButton("确定", new DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialog, int which) {

                                //获取修改后的值
                                bt.setName(et_1.getText().toString());
                                bt.setPhonenumber(et_2.getText().toString());

                                //执行修改数据库操作
                                BlackNumberDAO blackNumberDAO = new BlackNumberDAO(Activity_blackNumber.this);

                               blackNumberDAO.update(bt);

                                //更新集合
                                //BlackNumber bt = data.get(position)
                                //bt和data里面的对象同时指向的是同一个内存地址
                                //如果bt被修改了，data里面的对象也同时发生变化
                                //这就是引用类型的特点

                                //通知刷新列表
                                lad.notifyDataSetChanged();
                                Toast.makeText(Activity_blackNumber.this, "修改成功!", Toast.LENGTH_SHORT).show();
                            }
                        })
                        .setCancelable(false)
                        .show();

                break;

            //删除
            case 2:
                new AlertDialog.Builder(this)
                        .setMessage("确定要删除吗？")
                        .setNegativeButton("取消",null)
                        .setPositiveButton("确定", new DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialog, int which) {

                                //在数据库删除 需要id
                                BlackNumberDAO blackNumberDAO = new BlackNumberDAO(Activity_blackNumber.this);

                                blackNumberDAO.delete(bt.getId());

                                //刷新界面
                                //移除集合中的记录
                                data.remove(position);

                                //通知刷新
                                lad.notifyDataSetChanged();

                                Toast.makeText(Activity_blackNumber.this, "删除成功", Toast.LENGTH_SHORT).show();
                            }
                        })
                        .setCancelable(false)
                        .show();
                break;
        }
        return super.onContextItemSelected(item);

    }

    //抽象类 要继承并实现抽象方法后才能使用 实现适配器
    class listviewAdapter 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
                //1.获取layout文件  用加载器
                LayoutInflater layoutInflater = getLayoutInflater();
                convertView = layoutInflater.inflate(R.layout.layout_blacknumber_xianshi,null);

            }
            //给视图绑定数据
            TextView tv_1 = (TextView) convertView.findViewById(R.id.tv_bt_2);
            TextView tv_2 = (TextView) convertView.findViewById(R.id.tv_bt_3);

            tv_1.setText(data.get(position).getName());
            tv_2.setText(data.get(position).getPhonenumber());
            return convertView;

        }

    }

    //添加数据按钮
    public void tianjiaonclick(View view)
    {
        //1.获取加载器
        LayoutInflater layoutInflater = getLayoutInflater();
        //2.用加载器加载文件
        final View v = layoutInflater.inflate(R.layout.layout_duihuakuang,null);

        new AlertDialog.Builder(this)
                .setView(v)
                .setCancelable(false)
                .setNegativeButton("取消", null)
                .setPositiveButton("确定", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {

                        EditText et_1 = (EditText)v.findViewById(R.id.et_bt_1);
                        EditText et_2 = (EditText)v.findViewById(R.id.et_bt_2);

                        String name = et_1.getText().toString();
                        String number = et_2.getText().toString();

                        //1.构造实体类 参数为输入的电话号码
                        BlackNumber blackNumber = new BlackNumber(name,number);

                        BlackNumberDAO blackNumberDAO = new BlackNumberDAO(Activity_blackNumber.this);

                        //2.用数据库操作类 DAO 保存数据
                        blackNumberDAO.insert(blackNumber);

                        //添加数据到集合
                        //给add添加索引值从上往下加数据
                        data.add(0,blackNumber);

                        //通知适配器刷新ListView
                        lad.notifyDataSetChanged();

                    }
                })
                .show();
    }

    //全部删除
    public void quanbusconclick(View view)
    {
        new AlertDialog.Builder(this)
                .setMessage("确定要删除吗？")
                .setNegativeButton("取消",null)
                .setPositiveButton("确定", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {

                        //在数据库删除
                        BlackNumberDAO blackNumberDAO = new BlackNumberDAO(Activity_blackNumber.this);

                        blackNumberDAO.deleteAll();

                        //刷新界面
                        //移除集合中的记录
                        while (position < data.size()) {
                            data.remove(position);
                        }

                        //通知刷新
                        lad.notifyDataSetChanged();

                        Toast.makeText(Activity_blackNumber.this, "删除所有数据成功", Toast.LENGTH_SHORT).show();
                    }
                })
                .setCancelable(false)
                .show();

    }
}