屏幕锁知识点

1、android2.2锁屏源代码位置:
frameworks\policies\base\phone\com\android\internal\policy\impl

2、

从Android 2.2开始，加入了一个新的锁屏API位于android.app.admin.DevicePolicyManager包，DevicePolicyManager类的lockNow方法可以锁住屏幕，查看Android源代码发现其实是从IDevicePolicyManager实现的，整个AIDL接口调用代码为:

1. private final IDevicePolicyManager mService;
   
2. 
   
3. mService = IDevicePolicyManager.Stub.asInterface(
   
4.                 ServiceManager.getService(Context.DEVICE_POLICY_SERVICE));
   
5. 
   
6. if (mService != null) {
   
7.             try {
   
8.                 mService.lockNow();
   
9.             } catch (RemoteException e) {
   
10.                 Log.w(TAG, "Failed talking with device policy service", e);
    
11.             }
    
12. }
    传统的方法加入<uses-permission android:name="android.permission.DISABLE_KEYGUARD"></uses-permission>权限，使用下面代码可以锁住键盘，但屏幕不行

1.   KeyguardManager km =    (KeyguardManager)getSystemService(Context.KEYGUARD_SERVICE);
   
2.   KeyguardLock kl= km.newKeyguardLock(KEYGUARD_SERVICE);
   
3.   kl.reenableKeyguard();

3、

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