116.s1-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@Overridepublic void onCreate(SQLiteDatabase db) {db.execSQL("create table blacknumber (_id integer primary key autoincrement,number varchar(20),mode varchar(2))");}@Overridepublic 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;/** 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whilewhile(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;@Overrideprotected 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);}@Overridepublic 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(){}@Overridepublic int getCount() {// TODO Auto-generated method stubreturn lists.size();}@Overridepublic Object getItem(int position) {// TODO Auto-generated method stubreturn lists.get(position);}@Overridepublic long getItemId(int position) {// TODO Auto-generated method stubreturn position;}}

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