Android项目实战--手机卫士16--电话黑名单的增删改查




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好,今天我们来完成一下我们高级工具的黑名单功能,其实这个黑名单也很简单的,就是一个表记录用户标记的名单,当然有黑当然也有白啦,但是我们就不演示白名单的做法啦,都是和黑名单差不多的,你们有兴趣的可以自己完善一下。

好啦,让我们来看一下我们今天要做的效果,


我们做的是黑名单的增删改查,那么肯定就要建一个表啦

com.xiaobin.security.utils.DBHelper

package com.xiaobin.security.utils;

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

public class DBHelper extends SQLiteOpenHelper
{

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

@Override
public void onCreate(SQLiteDatabase db)
{
db.execSQL("create table blacknumber (_id integer primary key autoincrement, number varchar(20))");
}

@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion)
{
//数据库版本发生不同的时候调用
}

}

既然我们把数据库创建好啦,那么剩下来的就是增删改查啦

com.xiaobin.security.dao.BlackNumberDao

package com.xiaobin.security.dao;

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

import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;

import com.xiaobin.security.utils.DBHelper;

public class BlackNumberDao
{
private DBHelper dbHelper;

public BlackNumberDao(Context context)
{
dbHelper = new DBHelper(context);
}

public boolean find(String number)
{
boolean result = false;
SQLiteDatabase db = dbHelper.getReadableDatabase();
if(db.isOpen())
{
Cursor cursor = db.rawQuery("select number from blacknumber where number = ? ", new String[] {number});
if(cursor.moveToNext())
{
result = true;
}
cursor.close();
db.close();
}
return result;
}

public void add(String number)
{
find(number);
SQLiteDatabase db = dbHelper.getWritableDatabase();
if(db.isOpen())
{
db.execSQL("insert into blacknumber (number) values(?)", new Object[] {number});
db.close();
}
}

public void delete(String number)
{
SQLiteDatabase db = dbHelper.getWritableDatabase();
if(db.isOpen())
{
db.execSQL("delete from blacknumber where number = ? ", new Object[] {number});
db.close();
}
}

public void update(String oldNumber, String newNumber)
{
SQLiteDatabase db = dbHelper.getWritableDatabase();
if(db.isOpen())
{
db.execSQL("update blacknumber set number = ? where number = ? ", new Object[] {newNumber, oldNumber});
db.close();
}
}

public List<String> findAll()
{
List<String> numbers = new ArrayList<String>();
SQLiteDatabase db = dbHelper.getReadableDatabase();
if(db.isOpen())
{
Cursor cursor = db.rawQuery("select number from blacknumber", null);
while(cursor.moveToNext())
{
numbers.add(cursor.getString(0));
}
cursor.close();
db.close();
}
return numbers;
}

}

都是数据库的基本操作,我就不写注释啦,现在方法就写好啦,那么,就要写逻辑啦

com.xiaobin.security.ui.NumberSecurityActivity

package com.xiaobin.security.ui;

import java.util.List;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.text.InputType;
import android.text.TextUtils;
import android.view.ContextMenu;
import android.view.ContextMenu.ContextMenuInfo;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.view.Window;
import android.widget.AdapterView.AdapterContextMenuInfo;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

import com.xiaobin.security.R;
import com.xiaobin.security.dao.BlackNumberDao;

public class NumberSecurityActivity extends Activity
{
private ListView lv_number;
private Button bt_number_add;
private BlackNumberDao dao;
private List<String> numbers;
private NumberAdapter adapter;

@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.number_security);

dao = new BlackNumberDao(this);
numbers = dao.findAll();
adapter = new NumberAdapter();
lv_number = (ListView) findViewById(R.id.lv_number);
lv_number.setAdapter(adapter);
//给listview注册一个上下文菜单
registerForContextMenu(lv_number);

bt_number_add = (Button) findViewById(R.id.bt_number_add);
bt_number_add.setOnClickListener(new OnClickListener()
{
@Override
public void onClick(View v)
{
AlertDialog.Builder builder = new AlertDialog.Builder(NumberSecurityActivity.this);
builder.setTitle("添加黑名单");
final EditText et_number = new EditText(NumberSecurityActivity.this);
et_number.setInputType(InputType.TYPE_CLASS_PHONE);
et_number.setHint("请输入黑名单号码");
builder.setView(et_number);
builder.setPositiveButton("添加", new DialogInterface.OnClickListener()
{
@Override
public void onClick(DialogInterface dialog, int which)
{
String number = et_number.getText().toString().trim();
if(TextUtils.isEmpty(number))
{
Toast.makeText(NumberSecurityActivity.this, "添加号码不能为空", Toast.LENGTH_SHORT).show();
}
else
{
dao.add(number);
numbers = dao.findAll();
adapter.notifyDataSetChanged();
}
}
});
builder.setNegativeButton("取消", new DialogInterface.OnClickListener()
{
@Override
public void onClick(DialogInterface dialog, int which)
{

}
});
builder.create().show();
}
});
}

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

MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.number, menu);
}

@Override
public boolean onContextItemSelected(MenuItem item)
{
//拿到点击的菜单的信息
AdapterContextMenuInfo info = (AdapterContextMenuInfo) item.getMenuInfo();
switch(item.getItemId())
{
case R.id.update_number :
String oldNumber = numbers.get((int) info.id);
updateNumber(oldNumber);
break;

case R.id.delete_number :
int id = (int) info.id;
String number = numbers.get(id);
dao.delete(number);
numbers = dao.findAll();
adapter.notifyDataSetChanged();
break;

default :
break;
}
return super.onContextItemSelected(item);
}

private void updateNumber(final String oldNumber)
{
AlertDialog.Builder builder = new AlertDialog.Builder(NumberSecurityActivity.this);
builder.setTitle("更新黑名单");
final EditText et_number = new EditText(NumberSecurityActivity.this);
et_number.setInputType(InputType.TYPE_CLASS_PHONE);
et_number.setHint("请输入新的号码");
builder.setView(et_number);
builder.setPositiveButton("修改", new DialogInterface.OnClickListener()
{
@Override
public void onClick(DialogInterface dialog, int which)
{
String number = et_number.getText().toString().trim();
if(TextUtils.isEmpty(number))
{
Toast.makeText(NumberSecurityActivity.this, "添加号码不能为空", Toast.LENGTH_SHORT).show();
}
else
{
dao.update(oldNumber, number);
numbers = dao.findAll();
adapter.notifyDataSetChanged();
}
}
});
builder.setNegativeButton("取消", new DialogInterface.OnClickListener()
{
@Override
public void onClick(DialogInterface dialog, int which)
{

}
});
builder.create().show();
}

//==================================================================

private class NumberAdapter extends BaseAdapter
{
@Override
public int getCount()
{
return numbers.size();
}

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

@Override
public long getItemId(int position)
{
return position;
}

@Override
public View getView(int position, View convertView, ViewGroup parent)
{
if(convertView == null)
{
View view = View.inflate(NumberSecurityActivity.this, R.layout.number_security_item, null);
TextView tv_item = (TextView) view.findViewById(R.id.tv_number_item);
tv_item.setText(numbers.get(position));
return view;
}
else
{
TextView tv_item = (TextView) convertView.findViewById(R.id.tv_number_item);
tv_item.setText(numbers.get(position));
return convertView;
}
}
}

}

好啦,今天我们的黑名单的增删改查就到这里的啦,明天我们继续会完善这个黑名单的功能的

今天源码下载

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