屏蔽掉返回鍵，menu鍵，Home鍵

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public class LockActivity extends Activity{private  static final int FLAG_HOMEKEY_DISPATCHED = 0x80000000;@Overrideprotected void onCreate(Bundle savedInstanceState) {// TODO Auto-generated method stubsuper.onCreate(savedInstanceState);this.getWindow().setFlags(FLAG_HOMEKEY_DISPATCHED, FLAG_HOMEKEY_DISPATCHED);//關鍵代碼 setContentView(R.layout.activity_main);}@SuppressWarnings("static-access")@Overridepublic boolean onKeyDown(int keyCode, KeyEvent event) {if(keyCode==event.KEYCODE_BACK){return true;}if(keyCode==event. KEYCODE_HOME){return true;}if(keyCode == KeyEvent.KEYCODE_MENU) {//MENU鍵        //監控/攔截菜單鍵         return true;    }     return super.onKeyDown(keyCode, event);}}