问题
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:
<?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:
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:
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)
Does anyone know how i can fix this problem?
回答1:
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.
A few solutions to that problem:
Clean your project.
Modify an xml layout file and save.
Delete your R file. (Don't worry it will be automatically generated again).
Basically anything that makes your project rebuild and re-generate the R file.
回答2:
Just clean up your project and everything will be fine.
回答3:
Some times this problem shows because we have created ImageView But Cast with Image Button as like this
<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.
回答4:
Initially, I was getting error:
TextView : android:id="@+id/add_expected_seekbarvalue"
SeekBar : android:id="@+id/add_expected_seekbar"
As a fix, I renamed the id for TextView as
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.
回答5:
for Visual Studio Xamarin.Android Development
Like mentioned by many, Cleaning the project did the trick for me on Visual Studio For my Xamarin.Forms app, it happened after pulling in changes with new library reference.
Clean your project.
Basically anything that makes your project rebuild and re-generate the Rosource.Designer.cs file. (Burrowed from @Benito Bertoli)
回答6:
just clean your project... I also gone through similar problem.. after clean project everything will be fine..best luck
回答7:
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.
来源：https://stackoverflow.com/questions/11191040/android-java-lang-classcastexception-android-widget-imageview-cannot-be-cast-t