Android: java.lang.ClassCastException: android.widget.imageView 不能转换为 android.widget.textView
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Android: java.lang.ClassCastException: android.widget.imageView cannot be cast to android.widget.textView
提问by Release
I can't fix this problem on my listview template: i have the error as in the title of my post, but i won't cast imageview to textview. Here's my code:
我无法在我的 listview 模板上解决这个问题：我有我帖子标题中的错误，但我不会将 imageview 转换为 textview。这是我的代码：
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="200dip"
android:layout_weight="1"
android:paddingBottom="10dip" >
<TextView
android:id="@+id/mq"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentRight="true"
android:text="Metri quadri"
android:textColor="#33b5e5"
android:textSize="14sp"
android:textStyle="bold" />
<TextView
android:id="@+id/citta"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/mq"
android:layout_alignBottom="@+id/mq"
android:layout_centerHorizontal="true"
android:text="Citta"
android:textColor="#33b5e5"
android:textSize="14sp"
android:textStyle="bold" />
<TextView
android:id="@+id/prezzo"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:text="Prezzo"
android:textColor="#e1e1e1"
android:textSize="14sp"
android:textStyle="bold" />
<TextView
android:id="@+id/nome"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:padding="5dip"
android:scrollHorizontally="true"
android:singleLine="true"
android:text="@string/testolungo"
android:textColor="#e1e1e1"
android:textSize="20sp"
android:textStyle="bold" />
<ImageView
android:id="@+id/foto"
android:layout_width="80dip"
android:layout_height="60dip"
android:layout_alignParentLeft="true"
android:layout_centerVertical="true"
android:contentDescription="Release"
android:padding="5dip"
android:scaleType="centerCrop"
android:src="@drawable/stub" />
<TextView
android:id="@+id/descsplash"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:text="Small Text"
android:textSize="16sp"
android:textStyle="italic" />
</RelativeLayout>
The error for the java code is on line 58 of my file, where i assign the TextView id to TextView mq:
java 代码的错误在我的文件的第 58 行，我将 TextView id 分配给 TextView mq：
View vi=convertView;
if(convertView==null)
vi = inflater.inflate(R.layout.listlay, null);
TextView nome=(TextView)vi.findViewById(R.id.nome);
TextView mq=(TextView)vi.findViewById(R.id.mq); // here's the error (???)
TextView citta=(TextView)vi.findViewById(R.id.citta);
TextView prezzo=(TextView)vi.findViewById(R.id.prezzo);
ImageView image=(ImageView)vi.findViewById(R.id.foto);
TextView descrizione = (TextView)vi.findViewById(R.id.descsplash);
nome.setText(data.get(position).getNome());
mq.setText(data.get(position).getMetriQuadri());
citta.setText(data.get(position).getCitta());
prezzo.setText(data.get(position).getPrezzo());
descrizione.setText(data.get(position).getDescrizione());
imageLoader.DisplayImage(data.get(position).getForoUrl(), image);
And here is the logcat:
这是 logcat：
06-25 16:08:32.497: D/Debug(14642): Prendo Textview MQ
06-25 16:08:32.497: D/AndroidRuntime(14642): Shutting down VM
06-25 16:08:32.497: W/dalvikvm(14642): threadid=1: thread exiting with uncaught exception (group=0x40a561f8)
06-25 16:08:32.497: E/AndroidRuntime(14642): FATAL EXCEPTION: main
06-25 16:08:32.497: E/AndroidRuntime(14642): java.lang.ClassCastException: android.widget.ImageView cannot be cast to android.widget.TextView
06-25 16:08:32.497: E/AndroidRuntime(14642): at com.prova.listview.LazyAdapter.getView(LazyAdapter.java:58)
06-25 16:08:32.497: D/Debug(14642): Prendo Textview MQ
06-25 16:08:32.497: D/AndroidRuntime(14642): 关闭 VM
06-25 16:08:32.497: W/dalvikvm (14642): threadid=1: 线程退出时出现未捕获的异常 (group=0x40a561f8)
06-25 16:08:32.497: E/AndroidRuntime(14642): FATAL EXCEPTION: main
06-25 16:08:32.497: (14642): java.lang.ClassCastException: android.widget.ImageView 不能转换为 android.widget.TextView
06-25 16:08:32.497: E/AndroidRuntime(14642): 在 com.prova.listview.LazyAdapter.getView (LazyAdapter.java:58)
Does anyone know how i can fix this problem?
有谁知道我该如何解决这个问题？
回答by Benito Bertoli
Eclipse tends to mess up your resources every now and then. This leads to some odd behavior such as strings and images being swapped all over your app, and more commonly classCastException(s), which happen when Eclipse switches your Views' ids around.
Eclipse 往往会时不时地弄乱您的资源。这会导致一些奇怪的行为，例如在您的应用程序中交换字符串和图像，更常见的是 classCastException(s)，当 Eclipse 切换您的视图的 id 时会发生这种情况。
A few solutions to that problem:
该问题的几个解决方案：
Clean your project.
清理你的项目。
Modify an xml layout file and save.
修改一个xml布局文件并保存。
Delete your R file. (Don't worry it will be automatically generated again).
删除你的 R 文件。（不用担心它会再次自动生成）。
Basically anything that makes your project rebuild and re-generate the R file.
基本上任何使您的项目重建和重新生成 R 文件的东西。
回答by A?ssa Ghouti
Just clean up your project and everything will be fine.
只需清理您的项目，一切都会好起来的。
回答by touchchandra
Initially, I was getting error:
最初，我收到错误：
TextView : android:id="@+id/add_expected_seekbarvalue"
TextView : android:id="@+id/add_expected_seekbarvalue"
SeekBar : android:id="@+id/add_expected_seekbar"
SeekBar : android:id="@+id/add_expected_seekbar"
As a fix, I renamed the idfor TextViewas
作为修复，我将idfor重命名TextView为
TextView : android:id="@+id/add_expected_valueseekbar"
TextView : android:id="@+id/add_expected_valueseekbar"
Even clean up and other techniques didn't work but finally renaming the id worked like a charm.
即使清理和其他技术也不起作用，但最终重命名 id 就像一个魅力。
回答by Rohit
Some times this problem shows because we have created ImageView But Cast with Image Button as like this
有时会出现这个问题，因为我们已经创建了 ImageView 但是使用 Image Button 像这样投射
<ImageView
android:id="@+id/iv_thumb"
android:layout_width="50dip"
android:layout_height="50dip"
/>
holder.imageView = (ImageButton) convertView.findViewById(R.id.iv_thumb);
we have declared Imageview but cast to ImageButton, for this reason also have face this problem.
我们已经声明了 Imageview 但转换为 ImageButton，因此也面临这个问题。
回答by Ahmed Alejo
for Visual Studio Xamarin.Android Development
用于Visual Studio Xamarin.Android 开发
Like mentioned by many, Cleaningthe project did the trick for me on Visual Studio For my Xamarin.Forms app, it happened after pulling in changes with new library reference.
就像许多人提到的那样，在 Visual Studio 上清理项目对我有用，对于我的 Xamarin.Forms 应用程序，它是在使用新的库引用引入更改后发生的。
Clean your project.
清理你的项目。
Basically anything that makes your project rebuild and re-generate the Rosource.Designer.cs file. (Burrowed from @Benito Bertoli)
基本上任何使您的项目重建和重新生成 Rosource.Designer.cs 文件的东西。（来自@Benito Bertoli）
回答by Amol Suryawanshi
just clean your project... I also gone through similar problem.. after clean project everything will be fine..best luck
只是清理你的项目......我也遇到了类似的问题......清理项目后一切都会好起来......祝你好运
回答by Atieh mn
Maybe you have an image view in your .xml file and a button which dynamically generated and given an id in your java code and these two randomly get a same id and because of that you get this error. try to change the id which you have given in your code and it will be fine.
也许你的 .xml 文件中有一个图像视图和一个动态生成的按钮，并在你的 java 代码中给出了一个 id，这两个随机获得相同的 id，因此你会收到此错误。尝试更改您在代码中提供的 id，它会很好。
