@Override
public  boolean onKeyDown(int keyCode, KeyEvent event) 
{ // TODO Auto-generated method stub 
if(KeyEvent.KEYCODE_HOME==keyCode) 
    android.os.Process.killProcess(android.os.Process.myPid()); 
return  super.onKeyDown(keyCode, event); 
  } 

@Override
 public void onAttachedToWindow()
 { // TODO Auto-generated method stub 
this.getWindow().setType(WindowManager.LayoutParams.TYPE_KEYGUARD);
    super.onAttachedToWindow();
 }

加权限禁止Home键

<uses-permission android:name="android.permission.DISABLE_KEYGUARD"></uses-permission>