Question

我必须自定义XML视图。一个叫做按钮，另一个叫做main_alt。我想要实现的是当勾选共享pref时它会改变布局。

当用户首次启动应用程序时，我希望它显示buttons.xml 在添加更改XML的设置之前，我是如何做到这一点的，就是在mainActivity.xml中添加标记

我的共享首页很简单且有效

func tabBarController(_ tabBarController: UITabBarController, shouldSelect viewController: UIViewController) -> Bool {
    if let index = tabBarController.viewControllers?.index(of: viewController),
        index < tabBarTypes.count {
        let type = tabBarTypes[index]
        switch type {
        case .menu:
            // perform your menu presenting here
            return false
        case .controller:
            // do nothing, just return true, tab bar will do all work for you
            return true
        }
    }
    return true
}

我使用

在我的主要活动中调用该方法

cb6.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
    @Override
    public void onCheckedChanged(CompoundButton compoundButton, boolean b) {
        if (cb6.isChecked()) {

            editor.putBoolean("alt_layout",true);
            editor.putBoolean("checkbo6state", true);
            editor.commit();
            Log.i("Alt_Layout: ", "Activated");

        }else{
            editor.putBoolean("alt_layout",false);
            editor.putBoolean("checkbox6state", false);
            editor.commit();

            Log.i("Alt_Layout: ","Deactivated");
        }
    }
});

但我在logcat

中收到此错误

sharedpreferences = PreferenceManager.getDefaultSharedPreferences(this);
boolean alt_Layout = sharedpreferences.getBoolean("alt_layout",false);
if (alt_Layout== true){
    View view1;
    LayoutInflater inflater = (LayoutInflater) getApplicationContext().getSystemService
                (Context.LAYOUT_INFLATER_SERVICE);
    view1 = inflater.inflate(R.layout.main_alt,null);
    LinearLayout comp = (LinearLayout) findViewById(R.id.main);
    view1.setLayoutParams(new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT));
    <--This is line 80-->

    comp.addView(view1);

} else {
    View view;
    LayoutInflater inflater = (LayoutInflater) getApplicationContext().getSystemService
                (Context.LAYOUT_INFLATER_SERVICE);
    view = inflater.inflate(R.layout.buttons,null);
    LinearLayout comp = (LinearLayout) findViewById(R.id.main);
    view.setLayoutParams(new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT));

    comp.addView(view);
}

任何帮助总是非常感谢伙计们。感谢

Answer 1

好的，你需要这样做：

LinearLayout comp = (LinearLayout) findViewById(R.id.main);
if (alt_Layout) {
    LayoutInflater inflater = (LayoutInflater) getApplicationContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
inflater.inflate(R.id.main, comp, true);
} else {
    LayoutInflater inflater = (LayoutInflater) getApplicationContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
inflater.inflate(R.layout.buttons, comp, true);
}

使用共享pref扩展视图

1 个答案: