java.lang.ClassCastException:android.widget.LinearLayout無法強制轉換為android.support.v7.widget.Toolbar [英]java.lang.ClassCastException: android.widget.LinearLayout cannot be cast to android.support.v7.widget.Toolbar
java.lang.ClassCastException:android.support.design.widget.AppBarLayout無法轉換為android.support.v7.widget.Toolbar [英]java.lang.ClassCastException: android.support.design.widget.AppBarLayout cannot be cast to android.support.v7.widget.Toolbar
在空對象引用上使 android.support.v7.widget.Toolbar.setTitle(java.lang.CharSequence)'無效 [英]Void android.support.v7.widget.Toolbar.setTitle(java.lang.CharSequence)' on a null object reference
android.support.v7.widget.toolbar 在使用 android studio 的 java 文件中找不到? [英]android.support.v7.widget.toolbar is not found in java file using android studio?
如何修復 Java 中的“找不到以下類:-android.support.v7.widget.Toolbar”錯誤 [英]How to fix 'The following classes could not be found: - android.support.v7.widget.Toolbar' error in Java