Question

我有一些Activity单个全屏Fragment。在Fragment内部我有另一个Fragment覆盖屏幕的底部。因此，在屏幕的顶部，我Button控制内部Fragment的可见/隐藏：

包含Fragment的布局：

...
<FrameLayout
    android:id="@+id/inner_fragment"
    android:layout_width="match_parent"
    android:layout_height="200dp"
    android:layout_below="@+id/top_part"
    android:name="com.package.InnerFragment" />

控制Button：

controlButton.setOnClickListener(new OnClickListener() {
    @Override
    public void onClick(View v) {
        if (!isInnerVisible) showHideInnerFragment("show");
        else showHideInnerFragment("hide");
    }
});

辅助方法showHideInnerFragment：

private void showHideInnerFragment(String param) {
    //variables are class members...
    fragmentManager = getFragmentManager();
    fragmentTransaction = fragmentManager.beginTransaction();
    innerFragment = new InnerFragment();
    if (param.equals("show")) {
        fragmentTransaction.add(R.id.inner_fragment, innerFragment);
        isInnerVisible = true;
    } else {
        fragmentTransaction.remove(innerFragment);
        isInnerVisible = false;
    }
    fragmentTransaction.addToBackStack(null);
    fragmentTransaction.commit();
}

嗯 - 这完全不起作用......

Answer 1

看来你的isInnerVisible总是假的（我假设它从false开始），这会删除片段但保持isInnerVisible为false。你可能只需要切换它：

private void showHideInnerFragment(String param) {
    //variables are class members...
    fragmentManager = getFragmentManager();
    fragmentTransaction = fragmentManager.beginTransaction();
    innerFragment = new InnerFragment();
    if (param.equals("show")) {
        fragmentTransaction.add(R.id.inner_fragment, innerFragment);
        isInnerVisible = false;
    } else {
        fragmentTransaction.remove(innerFragment);
        isInnerVisible = true;
    }
    fragmentTransaction.addToBackStack(null);
    fragmentTransaction.commit();
}

我还会将一个true / false值传递给参数而不是字符串值，这样可以更容易理解代码正在做什么，因为它现在有点没用。我稍后会用一个例子更新;）

编辑：这是一个更好的方式来做你想要的：

controlButton.setOnClickListener(new OnClickListener() {
    @Override
    public void onClick(View v) {
        showHideInnerFragment(isInnerVisible);
    }
});

private void showHideInnerFragment(boolean isVisible) {
    //variables are class members...
    fragmentManager = getFragmentManager();
    fragmentTransaction = fragmentManager.beginTransaction();
    innerFragment = new InnerFragment();
    if (isVisible == false) {
        fragmentTransaction.add(R.id.inner_fragment, innerFragment);
        isInnerVisible = true;
    } else {
        fragmentTransaction.remove(innerFragment);
        isInnerVisible = false;
    }
    fragmentTransaction.addToBackStack(null);
    fragmentTransaction.commit();
}

Android：显示和隐藏片段

1 个答案: