public static final int FLAG_HOMEKEY_DISPATCHED = 0x80000000;

 @Override

     protected void onCreate(Bundle savedInstanceState) {

         super.onCreate(savedInstanceState);

         this.getWindow().setFlags(FLAG_HOMEKEY_DISPATCHED, FLAG_HOMEKEY_DISPATCHED);// 关键代码(监听home)

         setContentView(R.layout.activity_main);

 }