程序锁学习（指纹识别的基础）------阿冬专栏

今天药忘吃喽~ 2022-07-16 12:07 222阅读 0赞

# [高级工具--程序锁界面设计][--]（一） #

#     #

# 转载自：http://blog.csdn.net/asmcvc/article/details/18356007 #

界面效果图：

![SouthEast][]

在加载安装的应用程序列表时，显示进度条：

![SouthEast 1][]

布局文件：

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1.  **<?****xml**version="1.0"encoding="utf-8"**?>**
2.  
3.  **<****LinearLayout**xmlns:android="http://schemas.android.com/apk/res/android"
4.  android:orientation="vertical"android:layout\_width="match\_parent"
5.  android:layout\_height="match\_parent"**>**
6.  **<****TextView**style="@style/title\_center\_text"
7.  android:text="程序锁"**/>**
8.  **<****View**style="@style/splitter\_view"**/>**
9.  
10. **<****RelativeLayout**
11. android:layout\_height="fill\_parent"
12. android:layout\_width="fill\_parent"**>**
13. **<****LinearLayout**
14. android:id="@+id/ll\_applock\_loading"
15. android:gravity="center"
16. android:orientation="vertical"
17. android:visibility="invisible"
18. android:layout\_height="fill\_parent"
19. android:layout\_width="fill\_parent"**>**
20. **<****ProgressBar**
21. android:layout\_height="wrap\_content"
22. android:layout\_width="wrap\_content"**/>**
23. **<****TextView**style="@style/content\_text"
24. android:text="正在加载程序信息……"**/>**
25. **</****LinearLayout****>**
26. **<****ListView**
27. android:fastScrollEnabled="true"
28. android:id="@+id/lv\_applock"
29. android:layout\_height="match\_parent"
30. android:layout\_width="match\_parent"**/>**
31. **</****RelativeLayout****>**
32. **</****LinearLayout****>**

实际上在加载过程中进度控件是覆盖掉ListView的，当加载完毕后发送消息通知，消息处理过程隐藏掉进度控件即可。

ListView的每一个item的布局：

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1.  **<?****xml**version="1.0"encoding="utf-8"**?>**
2.  
3.  **<****RelativeLayout**xmlns:android="http://schemas.android.com/apk/res/android"
4.  android:orientation="horizontal"android:layout\_width="match\_parent"
5.  android:layout\_height="wrap\_content"**>**
6.  **<****ImageView**
7.  android:id="@+id/iv\_applock\_icon"
8.  android:layout\_height="wrap\_content"
9.  android:layout\_width="wrap\_content"
10. android:layout\_alignParentLeft="true"**/>**
11. **<****TextView**style="@style/content\_text"
12. android:id="@+id/iv\_applock\_name"
13. android:layout\_toRightOf="@+id/iv\_applock\_icon"**/>**
14. **<****ImageView**
15. android:id="@+id/iv\_applock\_status"
16. android:layout\_height="wrap\_content"
17. android:layout\_width="wrap\_content"
18. android:layout\_alignParentRight="true"**/>**
19. **</****RelativeLayout****>**

用来显示程序图标的ImageView，显示应用程序名的TextView，和锁定状态的ImageView。

界面在加载时先获取已安装的程序列表，保存应用程序的信息用一个AppInfo类来表示：

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1.  **package** com.example.mobilesafe.engine; 
2.  
3.  **import** android.graphics.drawable.Drawable; 
4.  
5.  /\*\*
6.   \* Created by sing on 14-1-15.
7.   \* desc:
8.   \*/
9.  **public****class** AppInfo \{ 
10. 
11. **private****static****final** String TAG = "AppInfo"; 
12. 
13. //包名
14. **private** String packname; 
15. 
16. //应用程序版本号
17. **private** String version; 
18. 
19. //应用程序名
20. **private** String appname; 
21. 
22. //应用程序图标
23. **private** Drawable appicon; 
24. 
25. //标识是否是用户层应用
26. **private****boolean** userpp; 
27. 
28. **public** String getPackname() \{ 
29. **return** packname; 
30.  \} 
31. 
32. **public****void** setPackname(String packname) \{ 
33. **this**.packname = packname; 
34.  \} 
35. 
36. **public** String getVersion() \{ 
37. **return** version; 
38.  \} 
39. 
40. **public****void** setVersion(String version) \{ 
41. **this**.version = version; 
42.  \} 
43. 
44. **public** String getAppname() \{ 
45. **return** appname; 
46.  \} 
47. 
48. **public****void** setAppname(String appname) \{ 
49. **this**.appname = appname; 
50.  \} 
51. 
52. **public** Drawable getAppicon() \{ 
53. **return** appicon; 
54.  \} 
55. 
56. **public****void** setAppicon(Drawable appicon) \{ 
57. **this**.appicon = appicon; 
58.  \} 
59. 
60. **public****boolean** isUserpp() \{ 
61. **return** userpp; 
62.  \} 
63. 
64. **public****void** setUserpp(**boolean** userpp) \{ 
65. **this**.userpp = userpp; 
66.  \} 
67. \}

获取安装的应用程序列表：

**\[java\]** [view plain][] [copy][view plain]

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1.  **package** com.example.mobilesafe.engine; 
2.  
3.  **import** android.content.Context; 
4.  **import** android.content.pm.ApplicationInfo; 
5.  **import** android.content.pm.PackageInfo; 
6.  **import** android.content.pm.PackageManager; 
7.  
8.  **import** java.util.ArrayList; 
9.  **import** java.util.List; 
10. 
11. /\*\*
12.  \* Created by sing on 14-1-15.
13.  \* desc:
14.  \*/
15. **public****class** AppInfoProvider \{ 
16. **private****static****final** String TAG = "AppInfoProvider"; 
17. 
18. **private** PackageManager pm; 
19. 
20. **public** AppInfoProvider(Context context) \{ 
21.  pm = context.getPackageManager(); 
22.  \} 
23. 
24. **public** List<AppInfo> getInstalledApps() \{ 
25.  List<PackageInfo> packageInfos = pm.getInstalledPackages(PackageManager.GET\_UNINSTALLED\_PACKAGES); 
26.  List<AppInfo> appInfos = **new** ArrayList<AppInfo>(); 
27. 
28. **for** (PackageInfo info : packageInfos) \{ 
29.  AppInfo appinfo = **new** AppInfo(); 
30.  appinfo.setPackname(info.packageName); 
31.  appinfo.setVersion(info.versionName); 
32.  appinfo.setAppname(info.applicationInfo.loadLabel(pm).toString()); 
33.  appinfo.setAppicon(info.applicationInfo.loadIcon(pm)); 
34.  appinfo.setUserpp(filterApp(info.applicationInfo)); 
35.  appInfos.add(appinfo); 
36.  appinfo = **null**; 
37.  \} 
38. 
39. **return** appInfos; 
40.  \} 
41. 
42. **public****boolean** filterApp(ApplicationInfo info) \{ 
43. **if** ((info.flags & ApplicationInfo.FLAG\_UPDATED\_SYSTEM\_APP) != 0) \{ 
44. **return****false**; 
45.  \} **else****if** ((info.flags & ApplicationInfo.FLAG\_SYSTEM) == 0) \{ 
46. **return****true**; 
47.  \} 
48. 
49. **return****false**; 
50.  \} 
51. \}

用户点击ListView的某一个item时，应进行锁定或解锁，锁定时将应用程序的包名存入到数据库中，以备后面监控使用。

操作[数据库][Link 1]的类：

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1.  **package** com.example.mobilesafe.db; 
2.  
3.  **import** android.content.Context; 
4.  **import** android.database.Cursor; 
5.  **import** android.database.sqlite.SQLiteDatabase; 
6.  
7.  **import** java.util.ArrayList; 
8.  **import** java.util.List; 
9.  
10. /\*\*
11.  \* Created by sing on 14-1-15.
12.  \* desc:对于锁定的app包名存储在数据库中
13.  \*/
14. **public****class** AppLockDao \{ 
15. **private****static****final** String TAG = "AppLockDao"; 
16. 
17. **private** AppLockDBOpenHelper helper; 
18. 
19. **public** AppLockDao(Context context) \{ 
20.  helper = **new** AppLockDBOpenHelper(context); 
21.  \} 
22. 
23. /\*\*
24.  \* 查找指定的包名程序是否被锁定
25.  \* @param packname
26.  \* @return
27.  \*/
28. **public****boolean** find(String packname) \{ 
29. **boolean** result = **false**; 
30. 
31.  SQLiteDatabase db = helper.getReadableDatabase(); 
32. **if** (db.isOpen()) \{ 
33.  Cursor cursor = db.rawQuery("select \* from applock where packname=?", **new** String\[\]\{packname\}); 
34. **if** (cursor.moveToFirst()) \{ 
35.  result = **true**; 
36.  \} 
37.  cursor.close(); 
38.  db.close(); 
39.  \} 
40. **return** result; 
41.  \} 
42. 
43. /\*\*
44.  \* 数据库中添加一个包名，也就是对这个包名程序进行锁定
45.  \* @param packname
46.  \* @return
47.  \*/
48. **public****boolean** add(String packname) \{ 
49. **if** (find(packname)) \{ 
50. **return****false**; 
51.  \} 
52. 
53.  SQLiteDatabase db = helper.getWritableDatabase(); 
54. **if** (db.isOpen()) \{ 
55.  db.execSQL("insert into applock (packname) values (?)", **new** String\[\]\{packname\}); 
56.  db.close(); 
57.  \} 
58. 
59. **return** find(packname); 
60.  \} 
61. 
62. /\*\*
63.  \* 删除某包名，下次不再对其锁定
64.  \* @param packname
65.  \*/
66. **public****void** delete(String packname) \{ 
67.  SQLiteDatabase db = helper.getWritableDatabase(); 
68. **if** (db.isOpen()) \{ 
69.  db.execSQL("delete from applock where packname=?", **new** String\[\]\{packname\}); 
70.  db.close(); 
71.  \} 
72.  \} 
73. 
74. /\*\*
75.  \* 查询所有被锁定的应用程序包名
76.  \* @return
77.  \*/
78. **public** List<String> findAll() \{ 
79.  List<String> packnames = **new** ArrayList<String>(); 
80.  SQLiteDatabase db = helper.getReadableDatabase(); 
81. **if** (db.isOpen()) \{ 
82.  Cursor cursor = db.rawQuery("select packname from applock", **null**); 
83. **while** (cursor.moveToNext()) \{ 
84.  packnames.add(cursor.getString(0)); 
85.  \} 
86.  cursor.close(); 
87.  db.close(); 
88.  \} 
89. 
90. **return** packnames; 
91.  \} 
92. \}

其中AppLockDBOpenHelper：

**\[java\]** [view plain][] [copy][view plain]

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1.  **package** com.example.mobilesafe.db; 
2.  
3.  **import** android.content.Context; 
4.  **import** android.database.sqlite.SQLiteDatabase; 
5.  **import** android.database.sqlite.SQLiteOpenHelper; 
6.  
7.  /\*\*
8.   \* Created by sing on 14-1-15.
9.   \* desc:
10.  \*/
11. **public****class** AppLockDBOpenHelper **extends** SQLiteOpenHelper \{ 
12. **private****static****final** String TAG = "AppLockDBOpenHelper"; 
13. 
14. **public** AppLockDBOpenHelper(Context context) \{ 
15. //参数一：应用上下文，参数二：数据库名称
16. //参数三：游标工厂对象，null表示使用系统默认的游标工厂对象，参数四：版本号
17. **super**(context, "applock.db", **null**, 1); 
18.  \} 
19. 
20. /\*\*
21.  \* 数据库第一次被创建的时候执行该方法
22.  \* 在该方法中，一般用于指定数据库的表结构
23.  \*/
24. @Override
25. **public****void** onCreate(SQLiteDatabase db) \{ 
26. //创建程序锁的表 (表中包含\_id,包名 )
27.  db.execSQL("create table applock (\_id integer primary key autoincrement, packname varchar(20))"); 
28.  \} 
29. 
30. /\*\*
31.  \* 当数据库的版本号 发生增加的时候调用的方法.
32.  \* 一般用于升级程序后,更新数据库的表结构.
33.  \*/
34. @Override
35. **public****void** onUpgrade(SQLiteDatabase sqLiteDatabase, **int** i, **int** i2) \{ 
36. 
37.  \} 
38. \}

至此，提供功能的类全部编写完毕，主activity：AppLockerActivity的代码：

**\[java\]** [view plain][] [copy][view plain]

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1.  **package** com.example.mobilesafe; 
2.  
3.  **import** android.app.Activity; 
4.  **import** android.os.Bundle; 
5.  **import** android.os.Handler; 
6.  **import** android.os.Message; 
7.  **import** android.view.View; 
8.  **import** android.view.ViewGroup; 
9.  **import** android.view.animation.Animation; 
10. **import** android.view.animation.TranslateAnimation; 
11. **import** android.widget.AdapterView; 
12. **import** android.widget.BaseAdapter; 
13. **import** android.widget.ImageView; 
14. **import** android.widget.ListView; 
15. **import** android.widget.TextView; 
16. 
17. **import** com.example.mobilesafe.R; 
18. **import** com.example.mobilesafe.db.AppLockDao; 
19. **import** com.example.mobilesafe.engine.AppInfo; 
20. **import** com.example.mobilesafe.engine.AppInfoProvider; 
21. 
22. **import** java.util.List; 
23. 
24. /\*\*
25.  \* Created by sing on 14-1-10.
26.  \* desc:
27.  \*/
28. **public****class** AppLockerActivity **extends** Activity \{ 
29. 
30. **public****static****final** String TAG = "AppLockerActivity"; 
31. 
32. **private** ListView lv\_applock; 
33. **private** View ll\_loading; 
34. 
35. **private** AppInfoProvider provider; 
36. **private** List<AppInfo> appInfos; 
37. **private** AppLockDao dao; 
38. **private** List<String> lockedPacknames; 
39. 
40. **private** Handler handler = **new** Handler()\{ 
41. @Override
42. **public****void** handleMessage(Message msg) \{ 
43.  ll\_loading.setVisibility(View.INVISIBLE); 
44.  lv\_applock.setAdapter(**new** AppLockAdapter()); 
45.  \} 
46.  \}; 
47. 
48. **public****void** onCreate(Bundle savedInstanceState) \{ 
49. **super**.onCreate(savedInstanceState); 
50.  setContentView(R.layout.applockeractivity\_layout); 
51. 
52.  lv\_applock = (ListView) findViewById(R.id.lv\_applock); 
53.  ll\_loading = findViewById(R.id.ll\_applock\_loading); 
54. 
55.  provider = **new** AppInfoProvider(**this**); 
56.  dao = **new** AppLockDao(**this**); 
57.  lockedPacknames = dao.findAll(); 
58. 
59.  ll\_loading.setVisibility(View.VISIBLE); 
60. **new** Thread()\{ 
61. **public****void** run() \{ 
62.  appInfos = provider.getInstalledApps(); 
63.  handler.sendEmptyMessage(0); 
64.  \} 
65.  \}.start(); 
66. 
67.  lv\_applock.setOnItemClickListener(**new** AdapterView.OnItemClickListener() \{ 
68. @Override
69. **public****void** onItemClick(AdapterView<?> adapterView, View view, **int** i, **long** l) \{ 
70.  AppInfo appInfo = (AppInfo) lv\_applock.getItemAtPosition(i); 
71.  String packname = appInfo.getPackname(); 
72.  ImageView iv = (ImageView) view.findViewById(R.id.iv\_applock\_status); 
73.  TranslateAnimation ta = **new** TranslateAnimation(Animation.RELATIVE\_TO\_SELF, 0, 
74.  Animation.RELATIVE\_TO\_SELF, 0.2f, 
75.  Animation.RELATIVE\_TO\_SELF, 0, 
76.  Animation.RELATIVE\_TO\_SELF, 0); 
77.  ta.setDuration(200); 
78. **if** (lockedPacknames.contains(packname)) \{ 
79.  dao.delete(packname); 
80.  iv.setImageResource(R.drawable.unlock); 
81.  lockedPacknames.remove(packname); 
82.  \}**else** \{ 
83.  dao.add(packname); 
84.  iv.setImageResource(R.drawable.lock); 
85.  lockedPacknames.add(packname); 
86.  \} 
87.  view.startAnimation(ta); 
88.  \} 
89.  \}); 
90.  \} 
91. 
92. **private****class** AppLockAdapter **extends** BaseAdapter \{ 
93. @Override
94. **public****int** getCount() \{ 
95. **return** appInfos.size(); 
96.  \} 
97. 
98. @Override
99. **public** Object getItem(**int** i) \{ 
100. **return** appInfos.get(i); 
101.  \} 
102. 
103. @Override
104. **public****long** getItemId(**int** i) \{ 
105. **return** i; 
106.  \} 
107. 
108. @Override
109. **public** View getView(**int** i, View view, ViewGroup viewGroup) \{ 
110.  View v; 
111.  ViewHolder holder; 
112. 
113. **if** (view==**null**) \{ 
114.  v = View.inflate(getApplicationContext(), R.layout.app\_lock\_item, **null**); 
115.  holder = **new** ViewHolder(); 
116.  holder.iv\_icon = (ImageView) v.findViewById(R.id.iv\_applock\_icon); 
117.  holder.iv\_status = (ImageView) v.findViewById(R.id.iv\_applock\_status); 
118.  holder.tv\_name = (TextView) v.findViewById(R.id.iv\_applock\_name); 
119.  v.setTag(holder); 
120.  \}**else**\{ 
121.  v = view; 
122.  holder = (ViewHolder)view.getTag(); 
123.  \} 
124. 
125.  AppInfo appInfo = appInfos.get(i); 
126.  holder.iv\_icon.setImageDrawable(appInfo.getAppicon()); 
127.  holder.tv\_name.setText(appInfo.getAppname()); 
128. **if** (lockedPacknames.contains(appInfo.getPackname())) \{ 
129.  holder.iv\_status.setImageResource(R.drawable.lock); 
130.  \}**else**\{ 
131.  holder.iv\_status.setImageResource(R.drawable.unlock); 
132.  \} 
133. 
134. **return** v; 
135.  \} 
136.  \} 
137. 
138. **public****static****class** ViewHolder \{ 
139.  ImageView iv\_icon; 
140.  ImageView iv\_status; 
141.  TextView tv\_name; 
142.  \} 
143. \}

这里使用了一个动画效果，当点击时相对左移一定距离，效果图：

![SouthEast 2][]

[程序锁原理（二）][--]\------阿冬专栏

程序锁的原理是一个“看门狗”的服务定时监视顶层activity，如果activity对应的包名是之前上锁的应用程序的，则弹出一个页面要求输入解锁密码，此页面不运行用户按“BACK”键返回，否则便能不输入密码直接进入应用程序了。如果密码输入正确则进入应用程序。

创建一个[Android][] component，kind为service，类名为：WatchDogService：

**\[java\]** [view plain][view plain 1] [copy][view plain 1]

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1.  **package** com.example.mobilesafe.service; 
2.  
3.  **import** android.app.ActivityManager; 
4.  **import** android.app.Service; 
5.  **import** android.content.Intent; 
6.  **import** android.database.ContentObserver; 
7.  **import** android.net.Uri; 
8.  **import** android.os.Binder; 
9.  **import** android.os.Handler; 
10. **import** android.os.IBinder; 
11. **import** android.util.Log; 
12. 
13. **import** com.example.mobilesafe.EnterPswdActivity; 
14. **import** com.example.mobilesafe.db.AppLockDao; 
15. **import** com.example.mobilesafe.engine.IService; 
16. 
17. **import** java.util.ArrayList; 
18. **import** java.util.List; 
19. 
20. /\*\*
21.  \* Created by sing on 14-1-16.
22.  \* desc:
23.  \*/
24. **public****class** WatchDogService **extends** Service \{ 
25. 
26. **public****static****final** String TAG = "WatchDogService"; 
27. 
28. **boolean** flag; 
29. 
30. **private** Intent pswdIntent; 
31. 
32. **private** List<String> lockPacknames; 
33. **private** List<String> tempStopProtectPacknames; 
34. 
35. **private** AppLockDao dao; 
36. 
37. **public** IBinder onBind(Intent intent) \{ 
38. **return****null**; 
39.  \} 
40. 
41. @Override
42. **public****void** onDestroy() \{ 
43.  flag = **false**; 
44.  getContentResolver().unregisterContentObserver(observer); 
45.  observer = **null**; 
46. **super**.onDestroy(); 
47.  \} 
48. 
49. @Override
50. **public****void** onCreate() \{ 
51. //注册内容观察者
52.  Uri uri = Uri.parse("content://com.example.mobilesafe.applock/"); 
53.  observer = **new** MyObserver(**new** Handler()); 
54.  getContentResolver().registerContentObserver(uri, **true**, observer); 
55. 
56. **super**.onCreate(); 
57.  dao = **new** AppLockDao(**this**); 
58.  flag = **true**; 
59.  lockPacknames = dao.findAll(); 
60.  tempStopProtectPacknames = **new** ArrayList<String>(); 
61.  pswdIntent = **new** Intent(**this**, EnterPswdActivity.**class**); 
62. //服务没有任务栈，如果要开启一个在任务栈中运行的activity，需要为其创建一个任务栈
63.  pswdIntent.setFlags(Intent.FLAG\_ACTIVITY\_NEW\_TASK); 
64. **new** Thread() \{ 
65. @Override
66. **public****void** run() \{ 
67. **while** (flag) \{ 
68.  ActivityManager am = (ActivityManager) getSystemService(ACTIVITY\_SERVICE); 
69. //获取当前正在栈顶运行的activity
70.  ActivityManager.RunningTaskInfo taskInfo = am.getRunningTasks(1).get(0); 
71.  String packname = taskInfo.topActivity.getPackageName(); 
72.  Log.i(TAG, packname); 
73. **if** (tempStopProtectPacknames.contains(packname)) \{ 
74. **try** \{ 
75.  Thread.sleep(200); 
76.  \} **catch** (InterruptedException e) \{ 
77.  e.printStackTrace(); 
78.  \} 
79. **continue**; 
80.  \} 
81. 
82.  pswdIntent.putExtra("packname", packname); 
83. **if** (lockPacknames.contains(packname)) \{ 
84.  startActivity(pswdIntent); 
85.  \} 
86. **try** \{ 
87.  Thread.sleep(200); 
88.  \} **catch** (InterruptedException e) \{ 
89.  e.printStackTrace(); 
90.  \} 
91. 
92.  \} 
93.  \} 
94.  \}.start(); 
95.  \} 
96. 
97. **public****void** tempStopProtect(String packname) \{ 
98.  tempStopProtectPacknames.add(packname); 
99.  \} 
100. \}

密码输入页面的类EnterPswdActivity：

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1.  **package** com.example.mobilesafe; 
2.  
3.  **import** android.app.Activity; 
4.  **import** android.content.ComponentName; 
5.  **import** android.content.Intent; 
6.  **import** android.content.ServiceConnection; 
7.  **import** android.content.pm.PackageInfo; 
8.  **import** android.content.pm.PackageManager; 
9.  **import** android.os.Bundle; 
10. **import** android.os.IBinder; 
11. **import** android.view.KeyEvent; 
12. **import** android.view.View; 
13. **import** android.widget.Button; 
14. **import** android.widget.EditText; 
15. **import** android.widget.ImageView; 
16. **import** android.widget.TextView; 
17. **import** android.widget.Toast; 
18. 
19. **import** com.example.mobilesafe.engine.IService; 
20. **import** com.example.mobilesafe.service.WatchDogService; 
21. 
22. /\*\*
23.  \* Created by sing on 14-1-16.
24.  \* desc:
25.  \*/
26. **public****class** EnterPswdActivity **extends** Activity \{ 
27. **public****static****final** String TAG = "EnterPswdActivity"; 
28. 
29. **private** ImageView iv\_icon; 
30. **private** TextView tv\_name; 
31. **private** EditText et\_pswd; 
32. **private** Button bt\_enter; 
33. 
34. **private** Intent serviceIntent; 
35. 
36. **private** IService iService; 
37. 
38. **private** MyConn conn; 
39. 
40. **private** String packname; 
41. 
42. **public****void** onCreate(Bundle savedInstanceState) \{ 
43. **super**.onCreate(savedInstanceState); 
44.  setContentView(R.layout.enterpswd\_layout); 
45. 
46.  iv\_icon = (ImageView) findViewById(R.id.iv\_icon); 
47.  tv\_name = (TextView) findViewById(R.id.tv\_name); 
48.  et\_pswd = (EditText) findViewById(R.id.et\_pswd); 
49.  bt\_enter = (Button) findViewById(R.id.bt\_enter); 
50.  bt\_enter.setOnClickListener(**new** View.OnClickListener() \{ 
51. @Override
52. **public****void** onClick(View view) \{ 
53.  String pswd = et\_pswd.getText().toString().trim(); 
54. **if** (pswd.isEmpty()) \{ 
55.  Toast.makeText(EnterPswdActivity.**this**,"密码不能为空",0).show(); 
56. **return**; 
57.  \} 
58. **if** (pswd.equals("123")) \{ 
59.  iService.callTempStopProtect(packname); 
60.  finish(); 
61.  \}**else**\{ 
62.  Toast.makeText(EnterPswdActivity.**this**,"密码不正确",0).show(); 
63. **return**; 
64.  \} 
65.  \} 
66.  \}); 
67. 
68. //获取到激活当前activity的意图，也就是WatchDogService传递的pswdIntent
69.  Intent intent = getIntent(); 
70.  packname = intent.getStringExtra("packname"); 
71. 
72.  serviceIntent = **new** Intent(**this**, WatchDogService.**class**); 
73.  conn = **new** MyConn(); 
74. 
75. //绑定服务（非startService），执行WatchDogService中的onCreate-onBing方法
76. //如果绑定成功，WatchDogService中onBing方法返回一个IBinder给conn.ServiceConnection
77.  bindService(serviceIntent, conn, BIND\_AUTO\_CREATE); 
78. 
79. **try** \{ 
80.  PackageInfo info = getPackageManager().getPackageInfo(packname, 0); 
81.  iv\_icon.setImageDrawable(info.applicationInfo.loadIcon(getPackageManager())); 
82.  tv\_name.setText(info.applicationInfo.loadLabel(getPackageManager())); 
83.  \} **catch** (PackageManager.NameNotFoundException e) \{ 
84.  e.printStackTrace(); 
85.  \} 
86. 
87.  \} 
88. 
89. **private****class** MyConn **implements** ServiceConnection \{ 
90. @Override
91. **public****void** onServiceConnected(ComponentName componentName, IBinder iBinder) \{ 
92.  iService = (IService) iBinder; 
93.  \} 
94. 
95. @Override
96. **public****void** onServiceDisconnected(ComponentName componentName) \{ 
97. 
98.  \} 
99.  \} 
100. 
101. @Override
102. **protected****void** onDestroy() \{ 
103. **super**.onDestroy(); 
104. 
105. //接触绑定
106.  unbindService(conn); 
107.  \} 
108. 
109. /\*\*
110.  \* 不允许用户按back键后退
111.  \* @param keyCode
112.  \* @param event
113.  \* @return
114.  \*/
115. @Override
116. **public****boolean** onKeyDown(**int** keyCode, KeyEvent event) \{ 
117. **if** (event.getAction()==KeyEvent.ACTION\_DOWN && event.getKeyCode()==KeyEvent.KEYCODE\_BACK) \{ 
118. **return****true**; 
119.  \} 
120. **return****super**.onKeyDown(keyCode, event); 
121.  \} 
122. \}

布局文件：

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1.  **<?****xml**version="1.0"encoding="utf-8"**?>**
2.  
3.  **<****LinearLayout**xmlns:android="http://schemas.android.com/apk/res/android"
4.  android:orientation="vertical"
5.  android:layout\_height="wrap\_content"
6.  android:layout\_width="match\_parent"**>**
7.  
8.  **<****RelativeLayout**style="@style/relativelayout"**>**
9.  **<****ImageView**
10. android:id="@+id/iv\_icon"
11. android:layout\_alignParentLeft="true"
12. android:layout\_height="wrap\_content"
13. android:layout\_width="wrap\_content"**/>**
14. **<****TextView**style="@style/content\_text"
15. android:id="@+id/tv\_name"
16. android:gravity="center"
17. android:layout\_centerVertical="true"
18. android:layout\_toRightOf="@+id/iv\_icon"**/>**
19. **</****RelativeLayout****>**
20. 
21. **<****EditText**
22. android:id="@+id/et\_pswd"
23. android:layout\_height="match\_parent"
24. android:layout\_width="match\_parent"**/>**
25. **<****Button**
26. android:id="@+id/bt\_enter"
27. android:text="确定"
28. android:gravity="center"
29. android:layout\_height="match\_parent"
30. android:layout\_width="match\_parent"**/>**
31. **</****LinearLayout****>**

这里EnterPswdActivity类重载了对onKeyDown消息的处理，如果用户按键为KEYCODE\_BACK则直接返回，防止用户在密码输入界面通过按“BACK”键进入到被锁定的应用程序界面。

EnterPswdActivity在启动时通过getIntent获取WatchDogService传递来的intent，进而通过getStringExtra("packname")获取被锁定的应用程序包名。进而通过getPackageManager获取包名对应的应用程序信息：图标和应用程序名。将这两个信息显示提示给用户，也即说明即将进入哪个被锁定的应用程序界面。

如图：

![SouthEast 3][]

最后通过bindService绑定服务，如果绑定成功WatchDogService中onBing方法返回一个IBinder给conn.ServiceConnection：

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1.  **private****class** MyConn **implements** ServiceConnection \{ 
2.  @Override
3.  **public****void** onServiceConnected(ComponentName componentName, IBinder iBinder) \{ 
4.   iService = (IService) iBinder; 
5.   \} 
6.  
7.  @Override
8.  **public****void** onServiceDisconnected(ComponentName componentName) \{ 
9.  
10.  \} 
11. \}

接口IService很简单：

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1.  **package** com.example.mobilesafe.engine; 
2.  
3.  /\*\*
4.   \* Created by sing on 14-1-16.
5.   \* desc:使看门狗服务停止对packname保护的接口
6.   \*/
7.  **public****interface** IService \{ 
8.  **public****void** callTempStopProtect(String packname); 
9.  \}

绑定服务这一过程是为了让WatchDogService返回一个操作接口，目的是在输入密码成功后调用该接口，使得能够进入被锁定的应用程序界面，临时不再被锁定。WatchDogService需要在onBind函数中返回一个对象：

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1.  **private** MyBinder binder; 
2.  
3.  **public** IBinder onBind(Intent intent) \{ 
4.   binder = **new** MyBinder(); 
5.  **return** binder; 
6.  \} 
7.  
8.  **private****class** MyBinder **extends** Binder **implements** IService \{ 
9.  @Override
10. **public****void** callTempStopProtect(String packname) \{ 
11.  tempStopProtect(packname); 
12.  \} 
13. \}

WatchDogService在绑定成功时创建了一个实现了IService接口的Binder对象给EnterPswdActivity.MyConn.onServiceConnected，用户正确输入密码后EnterPswdActivity调用该接口函数callTempStopProtect，该函数又调用WatchDogService的tempStopProtect：

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1.  **private** List<String> tempStopProtectPacknames; 
2.  **public****void** tempStopProtect(String packname) \{ 
3.   tempStopProtectPacknames.add(packname); 
4.  \}

将临时解锁的应用程序包名添加到临时停止保护的列表里去，在服务的监控线程中，如果发现应用程序包名已经在此列表里的话，便不再弹出对话框要求输入密码，会认为之前已经成功进入过了。

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1.  **if** (tempStopProtectPacknames.contains(packname)) \{ 
2.  **try** \{ 
3.   Thread.sleep(200); 
4.   \} **catch** (InterruptedException e) \{ 
5.   e.printStackTrace(); 
6.   \} 
7.  **continue**; 
8.  \}

[--]: http://blog.csdn.net/asmcvc/article/details/18313437
[SouthEast]: /images/20220716/c4860670dae540e39a3101015540a4ab.png
[SouthEast 1]: /images/20220716/9fa50b9fd4504becb8b22973cbeff03f.png
[view plain]: http://blog.csdn.net/asmcvc/article/details/18313437#
[CODE]: https://code.csdn.net/assets/CODE_ico.png
[CODE_CODE]: https://code.csdn.net/snippets/157733
[ico_fork.svg]: https://code.csdn.net/assets/ico_fork.svg
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[SouthEast 2]: /images/20220716/570166d2b6b04c808ac690ae0b4fbc6b.png
[Android]: http://lib.csdn.net/base/15
[view plain 1]: http://blog.csdn.net/asmcvc/article/details/18356007#
[CODE_CODE 1]: https://code.csdn.net/snippets/159019
[ico_fork.svg 2]: https://code.csdn.net/snippets/159019/fork
[SouthEast 3]: /images/20220716/dcfe7ee7fac14ff08220d9b9d0d78c91.png