116.黑名单设置的优化（封装BaseAdapter的方法）

继承的BaseAdapter里面有一些方法不会使用，可以创建一个自定义的MyBaseAdapter来实现那些方法，进行封装，优化代码

前面的都是一样的，多了一个封装的MyBaseAdapter.java同时对CallSafeActivity.java进行修改

主体和上一篇都是一致的，在显示的地方有一些不一样，通过对条目进行封装来优化

//谷歌推出的优化方案
ViewHolder holder;
if(convertView == null){
convertView = View.inflate(CallSafeActivity.this, R.layout.item_call_safe, null);
holder = new ViewHolder();
holder.tv_number = (TextView) convertView.findViewById(R.id.tv_number);
holder.tv_mode = (TextView) convertView.findViewById(R.id.tv_mode);
convertView.setTag(holder);
}else{
holder = (ViewHolder) convertView.getTag();
}

holder.tv_number.setText(blackNumberInfos.get(position).getNumber());
String mode = blackNumberInfos.get(position).getMode();
if(mode.equals("1")){
holder.tv_mode.setText("电话和短信拦截");
}else if(mode.equals("2")){
holder.tv_mode.setText("电话拦截");
}else if(mode.equals("3")){
holder.tv_mode.setText("短信拦截");
}
return convertView;

布局文件主布局让黑名单以listView的形式显示activity_call_safe.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
style="@style/TitleStyle"
android:text="黑名单管理"
/>
<include
android:id="@+id/list_view_callsafe"
layout="@layout/list_view_callsafe"/>

</LinearLayout>

ListView的布局activity_view_callsafe.xml

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

</ListView>

每一个条目的布局文件item_call_safe.xml

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

<TextView
android:id="@+id/tv_number"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="10dp"
android:textColor="@color/black"
android:textSize="20sp"
android:text="13000000000"
/>
<TextView
android:id="@+id/tv_mode"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="@color/black"
android:layout_marginLeft="10dp"
android:textSize="20sp"
android:layout_below="@id/tv_number"
android:text="电话拦截"
/>
<ImageView
android:layout_width="40dp"
android:layout_height="40dp"
android:layout_marginRight="10dp"
android:layout_alignParentRight="true"
android:background="@drawable/ic_delete_btn"
/>
</RelativeLayout>

创建数据库BlackNumberOpenHelper .java

package com.ldw.safe.db.dao;

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

/*
* 黑名单的SQLiteOpenHelper,创建黑名单数据库的表
*/
public class BlackNumberOpenHelper extends SQLiteOpenHelper{

public BlackNumberOpenHelper(Context context) {
super(context, "safe.db", null, 1);

}

//创建数据库的表
//blacknumber表名，_id逐渐自动增长，number电话号码，mode拦截模式，电话拦截，短信拦截
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL("create table blacknumber (_id integer primary key autoincrement,number varchar(20),mode varchar(2))");

}

@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// TODO Auto-generated method stub

}

}

黑名单的javaBean。BlackNumberInfo.java

package com.ldw.safe.bean;

/*
* 黑名单的javaBean
*/
public class BlackNumberInfo {

//number黑名单的号码，
//mode黑名单的拦截模式1表示全部拦截2表示电话拦截3表示全部拦截
private String number;
private String mode;
public String getNumber() {
return number;
}
public void setNumber(String number) {
this.number = number;
}
public String getMode() {
return mode;
}
public void setMode(String mode) {
this.mode = mode;
}

}

数据库的逻辑文件BlackNumberDao.java

package com.ldw.safe.db.dao;

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

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

import com.ldw.safe.bean.BlackNumberInfo;

/
bcb1
*
* 黑名单数据库的逻辑文件
*/
public class BlackNumberDao {

private BlackNumberOpenHelper helper;

public BlackNumberDao(Context context){

helper = new BlackNumberOpenHelper(context);
}

//添加黑名单
//number黑名单号码，mode拦截模式,"blacknumber"是表名
public boolean add(String number, String mode){
SQLiteDatabase db = helper.getWritableDatabase();
ContentValues contentValues = new ContentValues();
contentValues.put("number", number);
contentValues.put("mode", mode);
long blacknumber = db.insert("blacknumber", null, contentValues);
if(blacknumber == -1){
//添加失败
return false;
}else{
return true;
}

}

//通过电话号码删除黑命单
//number电话号码,"blacknumber"是表名
public boolean delete(String number){
SQLiteDatabase db = helper.getWritableDatabase();
int rowNumber = db.delete("blacknumber", "number=?", new String[]{number});
if(rowNumber == 0){
//删除失败
return false;
}else{
return true;
}
}

//修改黑名单的模式
public boolean changeNumberMode(String number, String mode){
SQLiteDatabase db = helper.getWritableDatabase();
ContentValues contentValues = new ContentValues();
contentValues.put("mode", mode);
int rowNumber = db.update("blacknumber", contentValues, "number=?", new String[]{number});
if(rowNumber == 0){
//修改失败
return false;
}else{
return true;
}
}

//通过电话号码查找黑名单拦截模式
public String findNumber(String number){
String mode = "";
SQLiteDatabase db = helper.getWritableDatabase();
Cursor cursor = db.query("blacknumber", new String[]{"mode"}, "number=?", new String[]{number}, null, null, null);
//只需要查询一个
if(cursor.moveToNext()){
mode = cursor.getString(0);
}
cursor.close();
db.close();
return mode;
}

//查找出所有的黑名单
public List<BlackNumberInfo> findAll(){
SQLiteDatabase db = helper.getWritableDatabase();
List<BlackNumberInfo> blackNumberInfos = new ArrayList<BlackNumberInfo>();
Cursor cursor = db.query("blacknumber", new String[]{"number", "mode"}, null, null, null, null, null);
//查询所有的所有用while
while(cursor.moveToNext()){
BlackNumberInfo blackNumberInfo = new BlackNumberInfo();
blackNumberInfo.setNumber(cursor.getString(0));
blackNumberInfo.setMode(cursor.getString(1));
blackNumberInfos.add(blackNumberInfo);
}
cursor.close();
db.close();
return blackNumberInfos;
}
}

activity显示的逻辑文件CallSafeActivity .java

package com.ldw.safe.Activity;

import java.util.List;

import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ListView;
import android.widget.TextView;

import com.ldw.safe.R;
import com.ldw.safe.adapter.MyBaseAdapter;
import com.ldw.safe.bean.BlackNumberInfo;
import com.ldw.safe.db.dao.BlackNumberDao;

public class CallSafeActivity extends Activity {

private ListView list_view_callsafe;
private List<BlackNumberInfo> blackNumberInfos;

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

initUi();
initData();
}

private void initData() {
BlackNumberDao dao = new BlackNumberDao(this);
//获取到表的所有数据
blackNumberInfos = dao.findAll();
//初始化适配器
CallSafeAdapter adapter = new CallSafeAdapter(blackNumberInfos, CallSafeActivity.this);
//配置适配器
list_view_callsafe.setAdapter(adapter);

}

private void initUi() {
list_view_callsafe = (ListView) findViewById(R.id.list_view_callsafe);

}

//对代码进行优化，继承自定义MyBaseAdapter，MyBaseAdapter继承自BaseAdapter封装一些常用的方法
private class CallSafeAdapter extends MyBaseAdapter<BlackNumberInfo>{
private CallSafeAdapter(List lists, Context mContext){
super(lists, mContext);
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
//谷歌推出的优化方案
ViewHolder holder;
if(convertView == null){
convertView = View.inflate(CallSafeActivity.this, R.layout.item_call_safe, null);
holder = new ViewHolder();
holder.tv_number = (TextView) convertView.findViewById(R.id.tv_number);
holder.tv_mode = (TextView) convertView.findViewById(R.id.tv_mode);
convertView.setTag(holder);
}else{
holder = (ViewHolder) convertView.getTag();
}

holder.tv_number.setText(lists.get(position).getNumber());
String mode = lists.get(position).getMode();
if(mode.equals("1")){
holder.tv_mode.setText("电话和短信拦截");
}else if(mode.equals("2")){
holder.tv_mode.setText("电话拦截");
}else if(mode.equals("3")){
holder.tv_mode.setText("短信拦截");
}
return convertView;
/*
//谷歌推出的优化方案
ViewHolder holder;
if(convertView == null){
convertView = View.inflate(CallSafeActivity.this, R.layout.item_call_safe, null);
holder = new ViewHolder();
holder.tv_number = (TextView) convertView.findViewById(R.id.tv_number);
holder.tv_mode = (TextView) convertView.findViewById(R.id.tv_mode);
convertView.setTag(holder);
}else{
holder = (ViewHolder) convertView.getTag();
}

holder.tv_number.setText(blackNumberInfos.get(position).getNumber());
String mode = blackNumberInfos.get(position).getMode();
if(mode.equals("1")){
holder.tv_mode.setText("电话和短信拦截");
}else if(mode.equals("2")){
holder.tv_mode.setText("电话拦截");
}else if(mode.equals("3")){
holder.tv_mode.setText("短信拦截");
}
return convertView;
*/
/*初步的优化
convertView = View.inflate(CallSafeActivity.this, R.layout.item_call_safe, null);
TextView tv_number = (TextView) convertView.findViewById(R.id.tv_number);
TextView tv_mode = (TextView) convertView.findViewById(R.id.tv_mode);

tv_number.setText(blackNumberInfos.get(position).getNumber());
String mode = blackNumberInfos.get(position).getMode();
if(mode.equals("1")){
tv_mode.setText("电话和短信拦截");
}else if(mode.equals("2")){
tv_mode.setText("电话拦截");
}else if(mode.equals("3")){
tv_mode.setText("短信拦截");
}
return convertView;
*/
/*传统的方式
View view = View.inflate(CallSafeActivity.this, R.layout.item_call_safe, null);
TextView tv_number = (TextView) view.findViewById(R.id.tv_number);
TextView tv_mode = (TextView) view.findViewById(R.id.tv_mode);

tv_number.setText(blackNumberInfos.get(position).getNumber());
String mode = blackNumberInfos.get(position).getMode();
if(mode.equals("1")){
tv_mode.setText("电话和短信拦截");
}else if(mode.equals("2")){
tv_mode.setText("电话拦截");
}else if(mode.equals("3")){
tv_mode.setText("短信拦截");
}
return view;
*/
}

}

static class ViewHolder{
TextView tv_number;
TextView tv_mode;
}

}


封装MyBaseAdapter.java继承自BaseAdapter.java,实现一些不重要的方法
package com.ldw.safe.adapter;

import java.util.List;

import android.content.Context;
import android.widget.BaseAdapter;

/*
*自定义适配器
*/
public abstract class MyBaseAdapter<T> extends BaseAdapter{
//不知道传入什么数据直接使用T来统一替代
public List<T> lists;
public Context mContext;
protected MyBaseAdapter(List<T> lists, Context mContext){
this.lists = lists;
this.mContext = mContext;
}

protected MyBaseAdapter(){

}

@Override
public int getCount() {
// TODO Auto-generated method stub
return lists.size();
}

@Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return lists.get(position);
}

@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return position;
}

}