黑名单

Posted 2020-07-23 1011042043

package com.example.wang.blacklist;

import android.app.AlertDialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
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 com.example.wang.blacklist.com.hanqi.blacklist.orm.BlackList;
import com.example.wang.blacklist.com.hanqi.blacklist.orm.BlackListDAO;

import java.util.ArrayList;

public class MainActivity extends AppCompatActivity {

    ListView lv_1;

    //数据访问对象
    BlackListDAO bld=new BlackListDAO(this);


    //数据集合
    ArrayList<BlackList> alb;

    BLAdapter bla;


    //长按的数据的索引

    int index;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        lv_1=(ListView)findViewById(R.id.lv_1);


        //获取数据集合
        alb=bld.getAll();

        //显示数据
        //adapter

        bla=new BLAdapter();
        lv_1.setAdapter(bla);

        //增加上下文菜单，设置创建菜单的监听器
        lv_1.setOnCreateContextMenuListener(this);

    }

    //重写创建上下文菜单的方法
    @Override
    public void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo) {
        super.onCreateContextMenu(menu, v, menuInfo);

        menu.add(0, 1, 1, "修改");
        menu.add(0, 2, 2, "删除");

        //获取长按的数据信息
        //1 得到菜单信息
        AdapterView.AdapterContextMenuInfo acmi =(AdapterView.AdapterContextMenuInfo)menuInfo;

        //2 得到数据在集合中的索引
        index=acmi.position;
    }

    //响应菜单点击的回调方法


    @Override
    public boolean onContextItemSelected(MenuItem item) {

        switch (item.getItemId())
        {
            case 1:
                //修改

                final EditText et=new EditText(this);
                et.setText(alb.get(index).getPhoneNumber());
                AlertDialog a=new AlertDialog.Builder(this)
                        .setTitle("修改黑名单")
                        .setView(et)
                        .setNegativeButton("取消", null)
                        .setPositiveButton("保存", new DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialog, int which) {

                                //1.得到新数据的实体类
                                //赋值 1）传值； 复制新的值再传递，应用于值类型
                                //    2）传址  传递的是内存地址，指向同一个对象，应用于引用类型
                                //1.1方法1
                                //BlackList blackList = new BlackList(alb.get(index).getId(),
                                //       et.getText().toString());

                                //1.2 方法2
                                BlackList blackList = alb.get(index);
                                blackList.setPhoneNumber(et.getText().toString());
                                //2-调用DAO的update方法
                                if (bld.updata(blackList) > 0) {
                                    Toast.makeText(MainActivity.this, "修改成功", Toast.LENGTH_SHORT).show();
                                } else {
                                    Toast.makeText(MainActivity.this, "修改失败", Toast.LENGTH_SHORT).show();
                                }

                                //3-刷新ListView
                                //方法1
                                // alb=bld.getAll();
                                //方法2
//                                alb.remove(index);
//                                alb.add(index, blackList);

                                //刷新列表
                                bla.notifyDataSetChanged();
                            }
                        })
                        .show();

                break;

            case 2:
                //删除确认对话框
                new  AlertDialog.Builder(this)
                        .setTitle("确定要删除？")
                        .setPositiveButton("确定", new DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialog, int which) {

                                //删除
                                if ( bld.delete(alb.get(index).getId())>0)
                                {
                                    Toast.makeText(MainActivity.this, "删除成功", Toast.LENGTH_SHORT).show();
                                    //更新List
                                    //方法1
                                    //alb=bld.getAll();

                                    //方法2
                                    alb.remove(index);

                                    //刷新列表
                                    bla.notifyDataSetChanged();
                                }
                                else
                                {
                                    Toast.makeText(MainActivity.this, "删除失败", Toast.LENGTH_SHORT).show();
                                }

                            }
                        })
                        .setNegativeButton("取消",null)
                        .show();



                break;
        }

        return super.onContextItemSelected(item);
    }

    //添加按钮的监听器
    public void add_OnClick(View v)
    {
        //自定义对话框
        final EditText editText=new EditText(this);
        editText.setHint("输入电话号码");
        editText.setInputType(InputType.TYPE_CLASS_PHONE);

        //构建对话框
        AlertDialog al=new AlertDialog.Builder(this)
                .setTitle("添加黑名单")
                .setView(editText)
                .setCancelable(false)
                .setNegativeButton("取消", null)
                .setPositiveButton("保存", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {

                        //向数据库保存
                        //1-定义实体类
                        BlackList blackList = new BlackList(editText.getText().toString());

                        //2-通过DAO插入数据
                        Long l=bld.insert(blackList);

                        if (l > 0) {
                            Toast.makeText(MainActivity.this, "保存成功", Toast.LENGTH_SHORT).show();

                            //更新List
                            //方法1
                            //alb=bld.getAll();

                            //方法2
                            blackList.setId(l);
                            alb.add(0,blackList);

                            //刷新列表
                            bla.notifyDataSetChanged();


                        } else {
                            Toast.makeText(MainActivity.this, "保存失败", Toast.LENGTH_SHORT).show();
                        }
                    }
                })
                .show();


    }

    //BaseAdapter 的实现类
    class  BLAdapter extends BaseAdapter
    {
        @Override
        public int getCount() {
            return alb.size();
        }

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

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

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {

            //得到数据
            BlackList blackList=alb.get(position);

            //得到视图
            if (convertView==null)
            {
                //构建视图
                convertView=new TextView(MainActivity.this);
            }

            //视图和数据做显示匹配
           TextView textView=(TextView)convertView;

            textView.setText(blackList.getPhoneNumber());

            textView.setTextSize(20);

            textView.setHeight(80);

            return convertView;
        }
    }
}

MainActivity

package com.example.wang.blacklist.com.hanqi.blacklist.orm;



//黑名单表的实体类
public class BlackList {

    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 BlackList(long id, String phoneNumber) {
        this.id = id;
        this.phoneNumber = phoneNumber;
    }

    public BlackList(String phoneNumber) {
        this.phoneNumber = phoneNumber;
    }
}

BlackList

package com.example.wang.blacklist.com.hanqi.blacklist.orm;

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

/**
 * Created by wang on 2016/6/7.
 */
public class DBHelper extends SQLiteOpenHelper {

    public DBHelper(Context context) {
        super(context, "blacklist.db", null, 1);
    }

    @Override
    public void onCreate(SQLiteDatabase db) {


        String sql="CREATE TABLE t_blacklist (_id  INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL," +
                "phone_number VARCHAR(20))";
        db.execSQL(sql);

        Log.e("TAG", "表创建成功");
    }

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

    }
}

DBHelper

package com.example.wang.blacklist.com.hanqi.blacklist.orm;

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;

/**
 * Created by wang on 2016/6/6.
 */

//数据库操作类
public class BlackListDAO {

    private  DBHelper dh;

    private  final String  TABLENAME="t_blacklist";

    public BlackListDAO(Context context)
    {
       // this.context=context;

        dh=new DBHelper(context);
    }

    //增
    //传入参数:实体类的实例
    public long insert(BlackList blackList)
    {
        long rtn=0;
        //连接数据库
        SQLiteDatabase sd=dh.getWritableDatabase();

        //执行insert语句
        //insert into t_blacklist（phone_number） values （）

        ContentValues cv=new ContentValues();

        cv.put("phone_number",blackList.getPhoneNumber());

        rtn=sd.insert(TABLENAME,null,cv);

        sd.close();
        return rtn;
    }

    //删
    public int delete(long id)
    {
        int rtn=0;

        //delete from t_blacklist where _id=?

        SQLiteDatabase sd=dh.getWritableDatabase();

        rtn=sd.delete(TABLENAME,"_id=?",new String[]{id+""});

        sd.close();
        return rtn;
    }

    //改
    public int updata(BlackList blackList)
    {
        int rtn=0;
        //updata t_blacklist set phone_number=? where _id=?
        SQLiteDatabase sd=dh.getWritableDatabase();

        ContentValues cv=new ContentValues();

        cv.put("phone_number",blackList.getPhoneNumber());

        rtn=sd.update(TABLENAME,cv,"_id=?",new String[]{blackList.getId()+""});

        Log.e("TAG", "jieguo= + xiugau"+blackList.getPhoneNumber());

        sd.close();
        return  rtn;
    }
    //查
    //返回查询结果
    public  ArrayList<BlackList> getAll()
    {
       ArrayList<BlackList>  blackLists=new ArrayList<>();

        //连接数据库
        SQLiteDatabase sd=dh.getWritableDatabase();
        //select * from t_blacklist

        //查询之后得到游标结果集
        Cursor cursor=sd.query(TABLENAME, null, null, null, null, null, "_id desc");

        //遍历结果集
        while (cursor.moveToNext())
        {
            //1.把数据转成实体类的实例
            BlackList bl=new BlackList(cursor.getLong(0),cursor.getString(1));

            //2.把实例放在集合里

            blackLists.add(bl);

          //  Log.e("TAG", "blackL" + cursor.getString(1));
        }

        cursor.close();

        sd.close();
        //返回这个集合
        return blackLists;
    }



}

BlackListDAO

<?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.wang.blacklist.MainActivity"
    android:orientation="vertical">

   <ListView
       android:layout_width="match_parent"
       android:layout_height="0dp"
       android:layout_weight="1"
       android:id="@+id/lv_1"></ListView>

    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="添加黑名单"
        android:onClick="add_OnClick"/>

</LinearLayout>

activity_main