我有两种口味 – paidapp和freeapp.
唯一的区别是,paidapp在MainActivity上还有一个按钮,比如说“付费按钮”.
paidapp有自己的布局,按钮 android：id =“@ id / paidbutton”,freeapp的布局没有这个按钮.

在代码我用这个：

if (BuildConfig.FLAVOR.equals("paidapp")) {
            View paidbutton = findViewById(R.id.paidbutton);
            paidbutton.setonClickListener(new OnClickListener() {
                @Override
                public void onClick(View v) {
                    //...
                }
            });
}

但我有一个错误找不到findViewById(R.id.paidbutton)中的符号变量;

如何在不克隆MainActivity.java的情况下解决这个问题？

EDIT1 – 添加更多代码示例：

摇篮：

productFlavors {
    paidapp {
    }
    freeapp {
    }
}

/app/src/main/res/layout/activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <Button
        android:id="@+id/goNext"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Go next" />

</LinearLayout>

/app/src/paidapp/res/layout/activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <Button
        android:id="@+id/goNext"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Go next" />

    <Button
        android:id="@+id/paidbutton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="See more" />


</LinearLayout>

/app/src/main/java/company/com/myapplication/MainActivity.java

package company.com.myapplication;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Toast;


public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        View goNext = findViewById(R.id.goNext);
        goNext.setonClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Toast.makeText(MainActivity.this,"goNext click",Toast.LENGTH_SHORT).show();
            }
        });

        if (BuildConfig.FLAVOR.equals("paidapp")) {
            View paidbutton = findViewById(R.id.paidbutton);
            paidbutton.setonClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    Toast.makeText(MainActivity.this,"paidapp click",Toast.LENGTH_SHORT).show();
                }
            });
        }
    }

}

EDIT2 – 我找到了一些使用反射的解决方法,但仍在寻找正常的解决方案：

而不是View paidbutton = findViewById(R.id.paidbutton);我用过View paidbutton = findViewById(getIdFromrId(“paidbutton”));

其中getIdFromrId是：

private int getIdFromrId(String idName) {
    int id = 0;
    try {
        Class c = R.id.class;
        Field field = c.getField(idName);
        id = field.getInt(null);
    } catch (Exception e) {
        // do nothing
    }
    return id;
}

如果你在freeapp产品风格中根本没有paybutton布局元素,你可以在freeapp product flavor文件夹中的一个资源xml文件中声明相应的id项.例如,创建包含以下内容的文件src / freeapp / res / values / ids.xml：

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <item name="paidbutton" type="id"/>
</resources>

在执行此操作之后,编译公共代码没有任何问题,因为将为两种产品风格定义符号R.id.paidbutton. findViewById()调用将返回paidapp构建中的真实布局元素,并将在freeapp构建中返回null.

UploadHandler.ashx.cs

public class UploadHandler : IHttpHandler
{
    public void ProcessRequest(HttpContext context)
    {
        context.Response.ContentType = "text/plain";
        try
        {
            string dirFullPath = HttpContext.Current.Server.MapPath("~/Uploader/");
            string[] files;
            int numFiles;
            files = System.IO.Directory.GetFiles(dirFullPath);
            numFiles = files.Length;
            numFiles = numFiles + 1;
            string str_image = "";

            foreach (string s in context.Request.Files)
            {
                HttpPostedFile file = context.Request.Files[s];
                string fileName = file.FileName;
                string fileExtension = file.ContentType;

                if (!string.IsNullOrEmpty(fileName))
                {
                    fileExtension = Path.GetExtension(fileName);
                    str_image = "MyPHOTO_" + numFiles.ToString() + fileExtension;
                    string pathToSave_100 = HttpContext.Current.Server.MapPath("~/Uploader/") + str_image;
                    file.SaveAs(pathToSave_100);
                }
            }
            //  database record update logic here  ()

            context.Response.Write(str_image);
        }
        catch (Exception ac)
        {

        }
    }

    public bool IsReusable
    {
        get
        {
            return false;
        }
    }

}

JsCode

/Image Upload code
function sendFile(file) {

    var formData = new FormData();
    formData.append('file',$('#f_UploadImage')[0].files[0]);

    $.ajax({
        url: 'UploadHandler.ashx',type: 'POST',data: formData,cache: false,processData: false,contentType: false,success: function(result) {
            if (result != 'error') {
                var my_path = "Uploader/" + result;
                $("#myUploadedImg").attr("src",my_path);
            }
        },error: function(err) {
            alert(err.statusText);
        }
    });
}


function callImgUploader() {
    var _URL = window.URL || window.webkitURL;
    $("#f_UploadImage").on('change',function() {

        var file,img;
        if ((file = this.files[0])) {
            img = new Image();
            img.onload = function() {
                sendFile(file);
            };
            img.onerror = function() {
                alert("Not a valid file:" + file.type);
            };
            img.src = _URL.createObjectURL(file);
        }
    });
}

注意：我的Aspx页面是不同的文件夹和Image Folder和UploadHandler.ashx.cs是路径文件夹错了吗？

运行ajax请求后每次给出Not-Found错误怎么能修复它.

谢谢.

您没有提到您正在使用哪个上传控件,我假设它是服务器端,您需要按如下方式访问它

更改

$('#f_UploadImage')

至

$('#<%= f_UploadImage.ClientID %>')