Android 软件退出系统方法重写

Android 软件退出系统按键方法重写

    //针对Andriod软件退出系统按键方法重写

    private long exitTime = 0;//key down time
    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        switch (keyCode) {
            case KeyEvent.KEYCODE_BACK:
                if (System.currentTimeMillis() - exitTime >= 2000) {
                    exitTime = System.currentTimeMillis();
                    showToast(getString(R.string.quit_on_double_click_));
                    return true;
                } else {
                    showToast(getString(R.string.exiting));
                    try {
                        Thread.sleep(1000);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                    finish();
                }
                break;
        }
        return super.onKeyDown(keyCode, event);
    }