android - Android 应用程序中的类转换异常

Question

我在下面的代码行中遇到类转换异常。我在下面附上了堆栈跟踪，下面的行是堆栈跟踪中提到的 339。

com.unique.may.utility.GlobalStateData gs = (com.unique.may.utility.GlobalStateData)
getApplication();

在全局状态数据中代码是

public class GlobalStateData extends Application {

private String findUsBranchEMailId;

public void setFindUsBranchEMailId(String findUsBranchEMailId) {
    this.findUsBranchEMailId = findUsBranchEMailId;
}

public String getFindUsBranchEMailId() {
    return findUsBranchEMailId;
}


}

堆栈跟踪

java.lang.ClassCastException: android.app.Application
at com.style.IntlLayout.Find.onChildClick(Find.java:339)
at android.widget.ExpandableListView.handleItemClick(ExpandableListView.java:588)
at android.widget.ExpandableListView.performItemClick(ExpandableListView.java:527)

下面是我的 list 文件

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.styling.Layout"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk android:minSdkVersion="8" />
 <uses-permission android:name="android.permission.INTERNET" />
 <uses-permission android:name="android.permission.CALL_PHONE" />
 <uses-permission android:name="android.permission.CAMERA" />
 <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />

 <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/>
 <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
 <uses-permission android:name="android.permission.SET_DEBUG_APP"></uses-permission>
 <support-screens
  android:largeScreens="true"
  android:normalScreens="true"
  android:smallScreens="true"
  android:anyDensity="true"/>

 <uses-library android:name="com.google.android.maps" />
 <application android:icon="@drawable/launcher"
    android:label="@string/app_name" 
    android:debuggable="true">

 <activity android:name=".Catalog" android:configChanges="orientation|keyboardHidden">    </activity>

     <activity android:name=".Feedback"    android:configChanges="orientation|keyboardHidden"></activity>

     <activity
        android:label="@string/app_name"
        android:name=".MainActivity"
        android:configChanges="orientation|keyboardHidden"  >
        <intent-filter >
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
       </activity>
   </application>


 </manifest>

期待您的回复。谢谢。

Answer 1

为了使用 getApplication() 函数，您必须首先在您的 list 中注册，Android 会自动为您实例化它。

<application android:name=".ApplicationName"