android - 另一种类型的变量和动态值

Question

我怎样才能实现下面的代码:

    String dynamiccolor = "R.color." + selectedcolor;


    View MainActivity = findViewById(R.id.mainactivity);
    View root = MainActivity.getRootView();
    root.setBackgroundColor(getResources().getColor( dynamiccolor )); 
//here dynamiccolor variable is string, but for errorfree code must be INT

我如何使用动态颜色变量，例如，对于 ex R.color.green？

Answer 1

将此方法添加到您的代码中:

protected final static int getResourceID
(final String resName, final String resType, final Context ctx)
{
    final int ResourceID =
        ctx.getResources().getIdentifier(resName, resType,
            ctx.getApplicationInfo().packageName);
    if (ResourceID == 0)
    {
        throw new IllegalArgumentException
        (
            "No resource string found with name " + resName
        );
    }
    else
    {
        return ResourceID;
    }
}

然后这样使用它:

// Assuming that you have your color resource in colors.xml
final int dynamiccolor = getResourceID(selectedcolor, "color", getApplicationContext());