我有这个异常“java.lang.ClassCastException:android.app.Application无法转换为com.utility.TablePlussAndroid” 我不明白为什么...非常感谢您的帮助
package com.tableplustablet;
private com.utility.TablePlusAndroid session;
public class LoginActivity extends Activity {
// ...
// get session from Application
session = (TablePlusAndroid) this.getApplication(); // <--EXCEPTION
session.setUserKey(userKey);
}
// -------------------------------------------------------------
package com.utility;
import android.app.Application;
//Save User Data in application's context
public class TablePlusAndroid extends Application{
private Long userKey;
private String userName;
private Long currentTableKey;
public Long getCurrentTableKey() {
return currentTableKey;
}
public void setCurrentTableKey(Long currentTableKey) {
this.currentTableKey = currentTableKey;
}
public Long getUserKey(){ return userKey;}
public void setUserKey(Long key){ userKey=key;}
public String getUserName() { return userName; }
public void setUserName(String userName) { this.userName = userName; }
}
最佳答案
您需要在 AndroidManifest.xml 文件中使用应用程序类。
它应该看起来像这样:
<application android:name="application.package.and.class">
<activity .... />
</application>
关于java - 尝试开发 Android 应用程序时出现 java.lang.ClassCastException，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/13977526/