onResume时窗口无焦点

启动Activity，在onResume的时刻，窗口尚未获得焦点，测试 :

    protected void onResume() {
        super.onResume();
        // The activity has become visible (it is now "resumed").
        Log.d(TAG, "onResume()");
        Log.d(TAG, "hasWindowFocus=" + hasWindowFocus());
        Log.d(TAG, "mEditText.hasWindowFocus=" + mEditText.hasWindowFocus());
        Log.d(TAG, "mEditText.hasFocus=" + mEditText.hasFocus());
    }

打印结果都是false，即：activity的窗口此刻未获得焦点。