5

我设法拉出布局，并将其添加到我的取景器中，但是，它在那里加载为空白。

代码是，

Resources packageResources;
Context packageContext;
try
{   
    packageResources = pm.getResourcesForApplication(packageName);
    packageContext = this.createPackageContext(packageName,     Context.CONTEXT_INCLUDE_CODE + Context.CONTEXT_IGNORE_SECURITY);                
 }
 catch(NameNotFoundException excep)
 {
     // the package does not exist. move on to see if another exists.
 }

 Class layoutClass;
 try
 {
       // using reflection to get the layout class inside the R class of the package
       layoutClass = packageContext.getClassLoader().loadClass(packageName + ".R$layout");
 }
 catch (ClassNotFoundException excep1)
 {
     // Less chances that class won't be there.
 }

 for( Field layoutID : layoutClass.getFields() )
 {
    try
    {
        int id = layoutID.getInt(layoutClass);
        XmlResourceParser xmlResourceLayout = packageResources.getLayout(id);

        View v = new View(this, Xml.asAttributeSet(xmlResourceLayout));

        this.viewFlipper.addView(v);                 
    }
    catch (Exception excep)
   {
    continue;
   }
}

我没有收到任何错误，我进行了调试和检查。布局 ID 正确。但是，在我看来Flipper 只是空白。我找不到任何警告或错误。

4

3 回答 3

4

终于明白了……其实很简单！！！！

这是我所做的...

  1. 在目标 apk 中，只有资源和布局，没有应用程序或活动代码。我创建了一个类，

    public final class ViewExtractor
{
    private static final int NUMBER_OF_LAYOUTS = 5;

    public static View[] getAllViews(Context context)
    {
        View[] result = new View[ViewExtractor.NUMBER_OF_LAYOUTS];

        result[0] = View.inflate(context, R.layout.layout_0, null);
        result[1] = View.inflate(context, R.layout.layout_1, null);
        result[2] = View.inflate(context, R.layout.layout_2, null);
        result[3] = View.inflate(context, R.layout.layout_3, null);
        result[4] = View.inflate(context, R.layout.layout_4, null);

        return result;
    }
 }

然后在我当前的应用程序中，我修改了我之前的代码。一旦包被验证存在，修改就会发生。

        // If the package exists then get the resources within it.
        // Use the method in the class to get the views.
        Class<?> viewExtractor;
        try
        {
            viewExtractor = packageContext.getClassLoader().loadClass(packageName + ".ViewExtractor");
        }
        catch (ClassNotFoundException excep)
        {
            continue;
        }

        View[] resultViews;
        try
        {
            Method m = viewExtractor.getDeclaredMethod("getAllViews", Context.class);

            resultViews= (View[])m.invoke(null, new Object[]{packageContext});

            for( View v : resultViews)
            {
                this.viewFlipper.addView(v);
            }
        }
        catch (Exception excep)
        {
            excep.printStackTrace();
        }
于 2012-11-04T17:56:57.230 回答
2

您不是在夸大布局。您正在创建一个空View并将其添加到您的ViewFlipper.

于 2012-11-04T13:23:41.750 回答
1

我目前正在这样做。它仅在知道应该提供布局层次结构的 .apk 中的活动或片段的包名称时才有效（我称之为外部上下文）。并且您需要知道要膨胀的布局的名称（例如 R.layout.mylayout -> "mylayout"）

Context c = createPackageContext(foreignPackageName,
    Context.CONTEXT_INCLUDE_CODE|Context.CONTEXT_IGNORE_SECURITY); //create foreign context
int resId = c.getResources.getIdentifier(mylayoutName,"layout",foreignPackageName); 
LayoutInflater myInflater = LayoutInflater.from(c); //Inflater for foreign context
View myLayout = myInflater.inflate(resId,null,false); //do not attach to a root view
于 2016-03-18T08:22:43.653 回答