意外的ClassCastException与findViewById [英] Unexpected ClassCastException with findViewById

问题描述

我玩弄可搜索词典"进入Android开发.

I play around with the 'searchable dictionnary' to get into Android development.

我的问题是修改XML布局时得到了ClassCastException.

My problem is that I get some ClassCastException when modifying the XML layouts.

我的猜测是R文件已经过时，但是奇怪的是，即使重新创建后我仍然有问题.

My guess is that the R file is outdated, but what is weird is that I still have the problem even after recreating it.

这是相关的代码和日志:

Here are the releveant piece of code and log :

日志文件:

原因:java.lang.ClassCastException:android.widget.ImageButton E/AndroidRuntime(438):在 eu.accleaner.android.WordActivity.onCreate(WordActivity.java:87)

Caused by: java.lang.ClassCastException: android.widget.ImageButton E/AndroidRuntime( 438): at eu.accleaner.android.WordActivity.onCreate(WordActivity.java:87)

活动"中的斜线:

mDefinition = (TextView) findViewById(R.id.definition);

预先感谢您的帮助.

干杯

Vincent

推荐答案

我遇到了类似的问题. R.java基于xml中的android:id生成ID:
public static final int imageButton01=0x7f050001;
public static final int definition=0x7f050002;

I had similar issue. R.java generates IDs based on android:id in xml:
public static final int imageButton01=0x7f050001;
public static final int definition=0x7f050002;

当我添加新的图像按钮时，R.java将更新为
public static final int imageButton01=0x7f050001;
public static final int imageButton02=0x7f050002;
public static final int definition=0x7f050003;

When I add new imagebutton R.java will update to
public static final int imageButton01=0x7f050001;
public static final int imageButton02=0x7f050002;
public static final int definition=0x7f050003;

由于同步问题，R.id.definition返回了mDefinition = (TextView) findViewById(R.id.definition);中的旧ID 0x7f050002，但根据更新的R.java，它对应于另一个元素(ImageButton02).

Due to synchronization problem R.id.definition returns old ID 0x7f050002 in mDefinition = (TextView) findViewById(R.id.definition); But it corresponds to another element (ImageButton02) according to updated R.java.

所以我们有ClassCastException

So we have ClassCastException

这篇关于意外的ClassCastException与findViewById的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！