黑名单练习

 

 

JAVA代码

package com.example.dell.heimingdanfu;

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

/**
 * Created by DELL on 2016/4/16.
 */
public class DBhelper extends SQLiteOpenHelper {


    public DBhelper(Context context) {
        super(context, "user", null, 1);
    }

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

        Log.e("TAG","创建数据表成功");
    }

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

    }
}

package com.example.dell.heimingdanfu;

/**
 * Created by DELL on 2016/4/16.
 */
public class HeiMingdanfu {

    private long _id;

    private String number;

    public HeiMingdanfu(long _id, String number) {
        this._id = _id;
        this.number = number;
    }

    public long get_id() {
        return _id;
    }

    public void set_id(long _id) {
        this._id = _id;
    }

    public String getNumber() {
        return number;
    }

    public void setNumber(String number) {
        this.number = number;
    }

    public HeiMingdanfu(String number) {
        this.number = number;
    }

    public HeiMingdanfu()
    {

    }
}

package com.example.dell.heimingdanfu;

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 DELL on 2016/4/16.
 */
public class HeiMingDanFuDAO {

   private DBhelper dBhelper;

    public HeiMingDanFuDAO(Context context) {
        dBhelper = new DBhelper(context);
    }

    //増
    public void insert(HeiMingdanfu heiMingdanfu)
    {
       SQLiteDatabase sd =  dBhelper.getWritableDatabase();

        ContentValues contentValues = new ContentValues();

        contentValues.put("number",heiMingdanfu.getNumber());

        sd.insert("user", null, contentValues);

        sd.close();

        Log.e("TAG","添加成功");
    }

    //删

    public void delete(long _id)
    {
        SQLiteDatabase sd =  dBhelper.getWritableDatabase();

        sd.delete("user","_id=?",new String[]{String.valueOf(_id)});

        sd.close();
    }


    //改

    public void update(HeiMingdanfu heiMingdanfu)
    {
        SQLiteDatabase sd = dBhelper.getWritableDatabase();

        ContentValues contentValues = new ContentValues();

        contentValues.put("number",heiMingdanfu.getNumber());

        sd.update("user", contentValues, "_id = ?", new String[]{String.valueOf(heiMingdanfu.get_id())});

        sd.close();
    }


    //查

    public List<HeiMingdanfu> getall()
    {
        List<HeiMingdanfu> rtn= new ArrayList<HeiMingdanfu>();;
        SQLiteDatabase sd = dBhelper.getWritableDatabase();

       Cursor cursor = sd.query("user", null, null, null, null, null, null);

        while (cursor.moveToNext())
        {
            rtn.add(new HeiMingdanfu(cursor.getLong(0),cursor.getString(1)));

        }

        return rtn;
    }

}

package com.example.dell.heimingdanfu;

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 java.util.List;


public class heimingdanfuActivity extends AppCompatActivity {

   private ListView lv_1;

    private List<HeiMingdanfu> data;

    private MyAdapter ma;

    private int position;

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

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

        HeiMingDanFuDAO heiMingDanFuDAO = new HeiMingDanFuDAO(this);

       data =  heiMingDanFuDAO.getall();

        ma = new MyAdapter();

        lv_1.setAdapter(ma);
        lv_1.setOnCreateContextMenuListener(this);
    }


    @Override
    public void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo) {

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

        AdapterView.AdapterContextMenuInfo info = (AdapterView.AdapterContextMenuInfo)menuInfo;
        position = info.position;
        super.onCreateContextMenu(menu, v, menuInfo);
    }

    @Override
    public boolean onContextItemSelected(MenuItem item) {

        switch (item.getItemId())
        {

            //修改
            case 0:
                final EditText editText = new EditText(this);
                editText.setText(data.get(position).getNumber());
                editText.setInputType(InputType.TYPE_CLASS_PHONE);
                new AlertDialog.Builder(this)
                        .setTitle("修改数据")
                        .setView(editText)
                        .setNeutralButton("取消",null)
                        .setPositiveButton("确定", new DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialog, int which) {

                                HeiMingDanFuDAO heiMingDanFuDAO =  new HeiMingDanFuDAO(heimingdanfuActivity.this);

                                data.get(position).setNumber(editText.getText().toString());


                                heiMingDanFuDAO.update(data.get(position));

                                ma.notifyDataSetChanged();
                            }
                        })
                        .show();

                break;
            //删除
            case 1:
                new AlertDialog.Builder(this)
                        .setTitle("确定删除吗？")
                        .setNeutralButton("取消",null)
                        .setPositiveButton("确定", new DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialog, int which) {
                                HeiMingDanFuDAO heiMingDanFuDAO = new HeiMingDanFuDAO(heimingdanfuActivity.this);


                                heiMingDanFuDAO.delete(data.get(position).get_id());

                                data.remove(position);

                                ma.notifyDataSetChanged();
                            }
                        })
                        .show();

                break;
        }

        return super.onContextItemSelected(item);
    }

    class MyAdapter 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).get_id();
        }

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

            if (convertView == null)
            {
                convertView = View.inflate(heimingdanfuActivity.this,android.R.layout.simple_list_item_1,null);

            }

            TextView textView = (TextView)convertView.findViewById(android.R.id.text1);

            textView.setText(data.get(position).getNumber());

            return convertView;
        }
    }

    public void tianjia(View view)
    {
        final EditText editText = new EditText(this);
        editText.setHint("请输入号码");
        editText.setInputType(InputType.TYPE_CLASS_PHONE);
        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) {

                        //data.add();

                        HeiMingDanFuDAO heiMingDanFuDAO = new HeiMingDanFuDAO(heimingdanfuActivity.this);

                        HeiMingdanfu heiMingdanfu = new HeiMingdanfu(editText.getText().toString());

                        heiMingDanFuDAO.insert(heiMingdanfu);

                        //添加数据到集合的顶部
                        data.add(0,heiMingdanfu );

                        ma.notifyDataSetChanged();



                    }
                })
                .show();
    }

}

XML代码

<?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.dell.heimingdanfu.heimingdanfuActivity"
    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"
        android:onClick="tianjia"/>

</LinearLayout>