黑马程序员之手机卫士第八天

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##day08##

- 来电短信黑名单拦截

- 演示金山卫士相关功能

- 创建BlackNumberActivity

- 布局文件

android:layout_width="match_parent"

android:layout_height="50dp"

android:background="#8866ff00" >

android:id="@+id/textView1"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_centerVertical="true"

android:layout_marginLeft="5dp"

android:text="黑名单管理"

android:textColor="#000"

android:textSize="22sp"/>

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_alignParentRight="true"

android:layout_centerVertical="true"

android:layout_marginRight="5dp"

android:text="添加" />

- 数据库创建

public class BlackNumberOpenHelperextends SQLiteOpenHelper {

public BlackNumberOpenHelper(Contextctx) {

super(ctx, "blacknumber.db", null,1);//必须实现该构造方法

}

@Override

public void onCreate(SQLiteDatabasedb) {

// 创建表, 三个字段,_id,number(电话号码),mode(拦截模式:电话,短信,电话+短信)

db.execSQL("create table blacknumber(_id integer primary key autoincrement, number varchar(20), modeinteger)");

}

@Override

public void onUpgrade(SQLiteDatabasedb, int oldVersion, int newVersion) {

}

- 单元测试

- 创建具备单元测试的Android项目,拷贝清单文件的相关代码

File->New->Project->Android TestProject

android:name="android.test.InstrumentationTestRunner"

android:targetPackage="com.itheima.mobilesafeteach"/>

- 增删改查(crud)逻辑实现

public class BlackNumberDao {

private static BlackNumberDaosInstance;

private BlackNumberOpenHelpermHelper;

private BlackNumberDao(Context ctx){

mHelper = newBlackNumberOpenHelper(ctx);

};

public static BlackNumberDaogetInstance(Context ctx) {

if (sInstance == null) {

synchronized (BlackNumberDao.class){

if (sInstance == null) {

sInstance = newBlackNumberDao(ctx);

}

return sInstance;

}

public void add(String number, intmode) {

SQLiteDatabase db =mHelper.getWritableDatabase();

ContentValues values = newContentValues();

values.put("number", number);

values.put("mode", mode);

db.insert("blacknumber", null,values);

db.close();

}

public void delete(String number){

SQLiteDatabase db =mHelper.getWritableDatabase();

db.delete("blacknumber", "number=?",new String[] { number });

db.close();

}

public void update(String number,int mode) {

SQLiteDatabase db =mHelper.getWritableDatabase();

ContentValues values = newContentValues();

values.put("mode", mode);

db.update("blacknumber", values,"number=?", new String[] { number });

db.close();

}

public boolean find(String number){

SQLiteDatabase db =mHelper.getWritableDatabase();

Cursor cursor =db.query("blacknumber",

new String[] { "number", "mode" },"number=?",

new String[] { number }, null, null,null);

boolean result = false;

if (cursor.moveToFirst()) {

result = true;

}

cursor.close();

db.close();

return result;

}

public int findMode(String number){

SQLiteDatabase db =mHelper.getWritableDatabase();

Cursor cursor =db.query("blacknumber", new String[] { "mode" },

"number=?", new String[] { number },null, null, null);

int mode = -1;

if (cursor.moveToFirst()) {

mode = cursor.getInt(0);

}

cursor.close();

db.close();

return mode;

}

public ArrayList findAll() {

SQLiteDatabase db =mHelper.getWritableDatabase();

Cursor cursor = db

.query("blacknumber", new String[] {"number", "mode" }, null,

null, null, null, null);

ArrayList list = newArrayList();

while (cursor.moveToNext()) {

String number =cursor.getString(0);

int mode = cursor.getInt(1);

BlackNumberInfo info = newBlackNumberInfo();

info.number = number;

info.mode = mode;

list.add(info);

}

cursor.close();

db.close();

return list;

}

public class BlackNumberInfo {

public String number;

public int mode;

@Override

public String toString() {

return "BlackNumberInfo [number=" +number + ", mode=" + mode + "]";

}

- 增删改查单元测试

public class TestBlackNumberDaoextends AndroidTestCase {

public void testCreateDb() {

BlackNumberOpenHelper helper = newBlackNumberOpenHelper(getContext());

helper.getWritableDatabase();

}

public void testAdd() {

//添加100个号码,拦截模式随机

Random random = new Random();

for (int i = 0; i < 100; i++){

int mode = random.nextInt(3) +1;

if (i < 10) {

BlackNumberDao.getInstance(getContext()).add("1381234560" +i,

mode);

} else {

BlackNumberDao.getInstance(getContext()).add("138123456" + i,

mode);

}

public void testDelete() {

BlackNumberDao.getInstance(getContext()).delete("13812345601");

}

public void testUpdate() {

BlackNumberDao.getInstance(getContext()).update("13812345600",2);

}

public void testFind() {

boolean find =BlackNumberDao.getInstance(getContext()).find(

"13812345600");

assertEquals(true, find);

}

public void testFindMode() {

int mode =BlackNumberDao.getInstance(getContext()).findMode(

"13812345600");

System.out.println("拦截模式:" +mode);

}

- 使用命令行查看数据库文件

1. 运行adb shell进入linux环境

2. 切换至data/data/包名/databases

3. 运行sqlite3 *.db,进入数据库

4. 编写sql语句,进行相关操作.记得加分号(;)结束

5. .quit退出sqlite,切换到adb shell

- 介绍convertView的重用机制

- 介绍ViewHolder的使用方法

//使用static修饰内部类,系统只加载一份字节码文件,节省内存

static class ViewHolder {

public TextView tvNumber;

public TextView tvMode;

}

-使用convertView和ViewHolder进行优化之后,重新使用traceview计算getView的执行时间,进行对比

- 最终优化结果

@Override

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

View view = null;

ViewHolder holder = null;

if (convertView == null) {

view =View.inflate(BlackNumberActivity.this,

R.layout.list_black_number_item,null);

System.out.println("listview创建");

//viewHolder类似一个容器,可以保存findViewById获得的view对象

holder = new ViewHolder();

holder.tvNumber = (TextView)view.findViewById(R.id.tv_number);

holder.tvMode = (TextView)view.findViewById(R.id.tv_mode);

// 将viewHolder设置给view对象,保存起来

view.setTag(holder);

} else {

view = convertView;

holder = (ViewHolder)view.getTag();// 从view对象中得到之前设置好的viewHolder

System.out.println("listview重用了");

}

BlackNumberInfo info =mBlackNumberList.get(position);

holder.tvNumber.setText(info.number);

switch (info.mode) {

case 1:

holder.tvMode.setText("拦截电话");

break;

case 2:

holder.tvMode.setText("拦截短信");

break;

case 3:

holder.tvMode.setText("拦截电话+短信");

break;

}

return view;

}

static class ViewHolder {

public TextView tvNumber;

public TextView tvMode;

}

- 启动子线程在数据库读取数据

当数据量比较大时,读取数据比较耗时,为了避免ANR,最好将该逻辑放在子线程中进行,为了模拟数据量大时访问比较慢的情况,可以让线程休眠1-2秒后再加载数据

- 加载中的进度条展示

- 数据分批加载

分批加载优势:避免一次性加载过多内容, 节省时间和流量

sql语句:

select * from blacknumber limit 20offset 0, 表示起始位置是0,加载条数为20, 等同于limit 0,20

public ArrayList findPart(intstartIndex) {

SQLiteDatabase db =mHelper.getWritableDatabase();

Cursor cursor = db.rawQuery(

"select number,mode from blacknumberorder by _id desc limit 20 offset ?",

new String[] {String.valueOf(startIndex) });

ArrayList list = newArrayList();

while (cursor.moveToNext()) {

String number =cursor.getString(0);

int mode = cursor.getInt(1);

BlackNumberInfo info = newBlackNumberInfo();

info.number = number;

info.mode = mode;

list.add(info);

}

cursor.close();

db.close();

return list;

}

public int getTotalCount() {

SQLiteDatabase db =mHelper.getWritableDatabase();

Cursor cursor = db.rawQuery("selectcount(*) from blacknumber", null);

int count = 0;

if (cursor.moveToNext()) {

count = cursor.getInt(0);

}

cursor.close();

db.close();

return count;

}

--------------------------------------

//监听listview的滑动事件

lvList.setOnScrollListener(newOnScrollListener() {

// 滑动状态发生变化

// 1.静止->滚动 2.滚动->静止3.惯性滑动

@Override

public voidonScrollStateChanged(AbsListView view, int scrollState) {

if (scrollState ==SCROLL_STATE_IDLE) {

//获取当前listview显示的最后一个item的位置

int lastVisiblePosition =lvList.getLastVisiblePosition();

//判断是否应该加载下一页

if (lastVisiblePosition >=mBlackNumberList.size() - 1

&& !isLoading) {

int totalCount =BlackNumberDao.getInstance(

BlackNumberActivity.this).getTotalCount();

//判断是否已经到达最后一页

if (mStartIndex >= totalCount){

Toast.makeText(BlackNumberActivity.this, "没有更多数据了",

Toast.LENGTH_SHORT).show();

return;

}

Toast.makeText(BlackNumberActivity.this, "加载更多数据...",

Toast.LENGTH_SHORT).show();

System.out.println("加载更多数据...");

initData();

}

-----------------------------------

//加载数据

private void initData() {

pbLoading.setVisibility(View.VISIBLE);//显示进度条

isLoading = true;

new Thread() {

@Override

public void run() {

try {

Thread.sleep(2000);

} catch (InterruptedException e){

e.printStackTrace();

}

// 第一页数据

if (mBlackNumberList == null){

mBlackNumberList =BlackNumberDao.getInstance(

BlackNumberActivity.this).findPart(mStartIndex);

} else {

mBlackNumberList.addAll(BlackNumberDao.getInstance(

BlackNumberActivity.this).findPart(mStartIndex));

}

mHandler.sendEmptyMessage(0);

}

}.start();

}

-----------------------------------

private intmStartIndex;//下一页的起始位置

private boolean isLoading;//表示是否正在加载

private Handler mHandler = newHandler() {

public voidhandleMessage(android.os.Message msg) {

pbLoading.setVisibility(View.GONE);//隐藏进度条

// 第一页数据

if (mAdapter == null) {

mAdapter = newBlackNumberAdapter();

lvList.setAdapter(mAdapter);

} else {

mAdapter.notifyDataSetChanged();//刷新adapter

}

mStartIndex =mBlackNumberList.size();

isLoading = false;

};

- 添加黑名单

public void addBlackNumber(View v){

AlertDialog.Builder builder = newAlertDialog.Builder(this);

View view = View.inflate(this,R.layout.dialog_add_black_number, null);

final AlertDialog dialog =builder.create();

dialog.setView(view, 0, 0, 0,0);

final EditText etBlackNumber =(EditText) view

.findViewById(R.id.et_black_number);

final RadioGroup rgMode =(RadioGroup) view.findViewById(R.id.rg_mode);

Button btnOK = (Button)view.findViewById(R.id.btn_ok);

Button btnCancel = (Button)view.findViewById(R.id.btn_cancel);

btnOK.setOnClickListener(newOnClickListener() {

@Override

public void onClick(View v) {

String number =etBlackNumber.getText().toString().trim();

if (!TextUtils.isEmpty(number)){

int checkedRadioButtonId =rgMode.getCheckedRadioButtonId();

int mode = 1;

//根据当前选中的RadioButtonId来判断是哪种拦截模式

switch (checkedRadioButtonId){

case R.id.rb_call:

mode = 1;

break;

case R.id.rb_sms:

mode = 2;

break;

case R.id.rb_all:

mode = 3;

break;

default:

break;

}

// 保存数据库

BlackNumberDao.getInstance(getApplicationContext()).add(

number, mode);

// 向列表第一个位置增加黑名单对象,并刷新listview

//注意:分页查询时需要逆序排列,保证后添加的最新数据展示在最前面

BlackNumberInfo info = newBlackNumberInfo();

info.number = number;

info.mode = mode;

mBlackNumberList.add(0, info);

mAdapter.notifyDataSetChanged();

dialog.dismiss();

} else {

Toast.makeText(getApplicationContext(), "输入内容不能为空!",

Toast.LENGTH_SHORT).show();

}

});

btnCancel.setOnClickListener(newOnClickListener() {

@Override

public void onClick(View v) {

dialog.dismiss();

}

});

dialog.show();

}

- 删除黑名单

holder.ivDelete.setOnClickListener(newOnClickListener() {

@Override

public void onClick(View v) {

//从数据库中删除

BlackNumberDao.getInstance(getApplicationContext()).delete(

info.number);

//从内存列表中删除并刷新listview

mBlackNumberList.remove(info);

mAdapter.notifyDataSetChanged();

}

});

- 创建黑名单拦截服务

- 拦截短信逻辑实现

逻辑类似手机防盗页面拦截特殊短信指令的代码,只不过该广播是动态注册,不是静态注册.动态注册的好处是可以随服务的开启或关闭来决定是否监听广播,而且在同等优先级的前提下,动态注册的广播比静态注册的更先接收到广播(可以通过打印日志进行验证)

- 设置页面增加黑名单拦截开关

通过此开关来开启和关闭服务, 逻辑类似来电归属地显示的开关

- 短信拦截优化

- 通过关键词智能拦截(介绍)

- 金山卫士智能拦截简介

- 金山卫士关键词数据库

查看第四天资料,金山卫士apk解压文件,assets目录下找firewall_sys_rules.db,该数据制定了短信和来电的拦截规则

短信拦截规则: 根据关键词对短信内容进行过滤.

比如fapiao

//对短信内容进行关键词过滤

String messageBody =msg.getMessageBody();

if (messageBody != null &&messageBody.contains("fapiao")) {

abortBroadcast();

}

- 分词(介绍)

单纯依靠关键词进行过滤有时会出现一些问题, 比如:

laogong, nikan,wodetoufapiaobupiaoliang....

所以有时候会对每一句话进行分词处理,比如可以将上述语句先拆分成不同的词语:laogong,nikan,wode,toufa,piaobupiaoliang,然后在这些词汇中对关键词再进行过滤

lucene分词检索框架

- 短信拦截的兼容性处理

4.4以上系统手机对短信权限进一步限制,导致无法拦截短信,可以通过监听短信数据库的变化,及时删除最新入库的垃圾短信来实现短信拦截的目的.为了避免误删旧的短信,需要和短信广播结合起来使用

- 来电拦截

1.挂断电话的API早期版本endCall()是可以使用的，现在不可以用了；但本身挂断电话这个功能是存在的

2.很多服务都是获取远程服务的代理对象IBinder,再调用里面的方法的.例如:

IBinder b =ServiceManager.getService(ALARM_SERVICE);

IAlarmManager service =IAlarmManager.Stub.asInterface(b);

return newAlarmManager(service);

3.于是我们跟踪TelephoneyManager,查看它的对象到底是如何创建的.我们跟踪到了这样一个方法:

private ITelephony getITelephony(){

returnITelephony.Stub.asInterface(ServiceManager.getService(Context.TELEPHONY_SERVICE));

}

该方法返回一个ITelephony对象,查看ITelephony对象的方法,发现有endCall方法

4.于是我们将获取ITelephony的代码拷贝到自己的项目中,发现无法导包,因为根本有没有ServiceManager这个类,但我们知道它肯定存在,因为TelephonyManager就引用了该类,只不过android系统隐藏了这个类,

5. 为了调用隐藏类的方法,我们想到了反射

- 通过反射获取endCall方法

public void endCall() {

try {

// 获取ServiceManager

Class clazz =BlackNumberService.class.getClassLoader().loadClass(

"android.os.ServiceManager");

Method method =clazz.getDeclaredMethod("getService", String.class);//获取方法getService

IBinder binder = (IBinder)method.invoke(null,

Context.TELEPHONY_SERVICE);//方法时静态的,不需要传递对象进去

ITelephony telephony =ITelephony.Stub.asInterface(binder);//获取ITelephony对象,前提是要先配置好aidl文件

telephony.endCall();//挂断电话

} catch (Exception e) {

e.printStackTrace();

}

注意加权限:

android:name="android.permission.CALL_PHONE"/>

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