禁用主要活动片段中的按钮 [英] disable button in fragment from main activity

问题描述

我在一个片段中有3个按钮，我想从主要活动中禁用它们.我曾尝试在replace()newfragment之前使用bundle选项，但它产生了其他问题.片段中的按钮可以强制转换为主要活动吗?这样的事情.我收到无法投射的错误，但我的输入不正确.

I have 3 buttons in a fragment and I want to disable them from the main activity. I have tried to use the bundle option before replace() newfragment but it created other issues. Can a button in a fragment be casted to a main activity ? Something like this. I get the error cannot cast but my entries are incorrect.

            RedUp = (ButtonControls) getFragmentManager().findFragmentById(R.id.btnRedUP);

这是我的main.xml，其中包含名为rgb_controls的片段

Here is my main.xml this holds the fragment called rgb_controls

        <FrameLayout
    android:id="@+id/rgb_controls"
    android:layout_width="390dp"
    android:layout_height="match_parent"
    android:layout_marginLeft="550dp"
    android:layout_marginTop="10dp" >
</FrameLayout>

这是片段xml中名为button_controls.xml的按钮

Here is the button in the fragment xml called button_controls.xml

        <Button
    android:id="@+id/btnRedUP"
    android:layout_width="80dp"
    android:layout_height="80dp"
    android:layout_marginLeft="10dp"
    android:layout_marginTop="80dp"
    android:text="UP"
    android:textSize="30dp" />

这是片段活动

    public class ButtonControls extends Fragment {

public Button RedUp, RedDn, GreenUp, GreenDn, BlueUp, BlueDn;

View view;

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

    view = inflater.inflate(R.layout.button_controls, container, false);

    RedUp = (Button) view.findViewById(R.id.btnRedUP);
    return view;

       }

           }

片段是使用replace()添加的

Fragment is added using the replace()

                Fragment ButtonFragment = new ButtonControls();
        ButtonFragment.setArguments(bundle);

        FragmentManager fm = getSupportFragmentManager();
        FragmentTransaction ft = fm.beginTransaction();
        ft.replace(R.id.rgb_controls, ButtonFragment).addToBackStack(null).commit();

推荐答案

类似这样的事情应该可以解决:

Something like this should do the thing:

ButtonControls fragment = (ButtonControls)
    getFragmentManager().findFragmentById(R.id.rgb_controls);
fragment.setButtonsGone();

您必须在 ButtonControls 中实际实现此 setButtonsGone 方法.诸如此类:

You have to actually implement this setButtonsGone method in ButtonControls. Something as:

public void setButtonsGone() {
    RedUp.setVisibility(View.GONE);
    RedDn.setVisibility(View.GONE);
    GreenUp.setVisibility(View.GONE);
    GreenDn.setVisibility(View.GONE);
    BlueUp.setVisibility(View.GONE);
    BlueDn.setVisibility(View.GONE);
}

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