如何在每个屏幕上禁用android后退按钮？

@Override
public void onBackPressed() {
    // 禁用后退按钮，不执行任何操作
}

@Override
public boolean dispatchKeyEvent(KeyEvent event) {
    if (event.getKeyCode() == KeyEvent.KEYCODE_BACK) {
        // 禁用后退按钮，消费事件
        return true;
    }
    return super.dispatchKeyEvent(event);
}

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    // 设置窗口属性
    WindowManager.LayoutParams params = getWindow().getAttributes();
    params.flags |= WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE;
    getWindow().setAttributes(params);
}