Question

我需要一个子布局（可以是任何布局，如FrameLayout或RelativeLayout）来忽略方向更改并始终保持横向方向。但不是它的父母或任何其他兄弟布局/视图，他们应该相应地改变他们的方向。

因此，我无法使用setRequestedOrientation()或android:screenOrientation="landscape"。或者它将锁定整个屏幕或活动的方向。我只需要锁定这个单一的布局。

我的布局XML：

RelativeLayout (Parent)
  TextView
    FrameLayout/RelativeLayout <-- this need to be locked
      FrameLayout
        Button

Answer 1

扩展要保持纵向的布局类，并覆盖dispatchConfiurationChanged（Configuration）方法，如下所示。

public void dispatchConfigurationChanged(Configuration newConfig) {
    Configuration c = new Configuration(newConfig); // copy
    c.orientation = ORIENTATION_PORTRAIT; // lock to portrait
    super.dispatchConfigurationChanged(c);
}

确保您的应用程序配置为不在方向更改时重新启动。

Answer 2

这可能取决于你所说的“不改变方向”。但是，我认为最好的起点是为不应该改变的部分创建自己的类。所以布局xml现在有两个文件：

main_layout.xml

RelativeLayout (Parent)
    TextView
        MyNonChangingLayout

my_non_changing_layout.xml

 RelativeLayout
     FrameLayout
         Button

你创建的地方

MyNonChangingLayout extends FrameLayout {
    MyNonchangingLayout(Context content) {
        super(context);
        myContext = context;
        makeFromXML();
    }

private void makeFromXML() {
    LayoutInflater inflater = (LayoutInflater)myContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    topView =  inflater.inflate(MyR.layout.my_non_changing_layout, this, false);

    // Get all the sub Views here using topView.findViewById()

    // Do any other initiation of the View you need here

    // Make sure you this otherwise it won't actually appear!
    super.addView(topView);
}

/*
 * Then, you can override quite a lot of the layout's calls and
 * enforce behaviour on the children. Two examples:
 */

// To specifically catch orientation changes
@Overridge
onConfigurationChanged(Configuration newConfig) {
    super.onConfigurationChanged(newConfig);
    // You could create the layout here by removing all views and rebuilding them
    // Perhaps by having a two xml layouts, one of which is "90 degrees out" ...
    // If you do make the layot here, make sure you don't clash with the constructor code!
    switch (newConfig.orientation) {
        case ORIENTATION_LANDSCAPE:
            // Make the layout for this orientation (as per above)
            break;
        case ORIENTATION_PORTRAIT:
            // Make the layout for this orientation (as per above)
            break;
        case ORIENTATION_SQUARE:
            // Make the layout for this orientation (as per above)
            break;
    }
}

//to handle size changes to enforce aspect ratios on children:
@override
protected void onSizeChanged (int w, int h, int oldw, int oldh) {
    super.onSizeChanged(w, h, oldw, oldh);

    int viewWidth = //something I've determine
    int viewHeight = //something I've determined
    setViewsize(viewToHaveSizedControlled, viewWidth, viewheight);
}

// The post thing means that it doesn't crash no matter which thread it is
// executed on ...
private void setViewsize(final View v, final int w, final int h) {
    post(new Runnable() {
        public void run() {
            ViewGroup.LayoutParams lp = v.getLayoutParams();
            lp.width = w;
            lp.height = h;
            v.setLayoutParams(lp);
    }});
}

}

然后，你可以很好地执行你想要的任何事情。如果您可以更具体地了解要在子区域上执行的行为，我可能会建议更具体的代码。

您可能想要做的一件事就是保持

如何仅针对布局而不是整个屏幕/活动来防止方向更改

2 个答案: