android 4.0 屏蔽home键实现

最近研究锁屏，按照常规的方法，常规方法如下

    public void onAttachedToWindow()      {               this.getWindow().setType(WindowManager.LayoutParams.TYPE_KEYGUARD);                 super.onAttachedToWindow();       }

但是这个方法到了4.0的系统上就失效了，按home照样会返回桌面。apktool了几个锁屏的软件之后发现其实现方法，即用WindowManager的addview方法将view加到窗口上，加上的时候将view的layoutparamas的type设为LayoutParams.TYPE_SYSTEM_ERROR，这个值sdk的解释为

  public static final int TYPE_SYSTEM_ERROR       Since: API Level 1       Window type: internal system error windows, appear on top of everything they can.

如果直接这样用会报错，还要在AndroidManifest.xml里面加上权限<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW"/>，ok上完整代码，封装了一个类，其中Lock和hide方法实现锁屏和解锁。

public class LockLayer {      private Activity mActivty;      private WindowManager mWindowManager;      private View mLockView;      private LayoutParams mLockViewLayoutParams;            public LockLayer(Activity act) {          mActivty = act;          init();      }        private void init(){          mWindowManager = mActivty.getWindowManager();          mLockViewLayoutParams = new LayoutParams();          mLockViewLayoutParams.width = LayoutParams.MATCH_PARENT;          mLockViewLayoutParams.height = LayoutParams.MATCH_PARENT;          //实现关键          mLockViewLayoutParams.type = LayoutParams.TYPE_SYSTEM_ERROR;          //apktool value，这个值具体是哪个变量还请网友帮忙          mLockViewLayoutParams.flags = 1280;      }      public void lock() {          if(mLockView!=null){              mWindowManager.addView(mLockView, mLockViewLayoutParams);          }      }      public void unlock() {          if(mWindowManager!=null){              mWindowManager.removeView(mLockView);          }      }      public void setLockView(View v){          mLockView = v;      }  }

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