我在运行android cardview时遇到此错误

Question

Suppressed: java.lang.ClassNotFoundException: android.support.constraint.ConstraintLayout
                                                                            at java.lang.Class.classForName(Native Method)
                                                                            at java.lang.BootClassLoader.findClass(ClassLoader.java:781)
                                                                            at java.lang.BootClassLoader.loadClass(ClassLoader.java:841)
                                                                            at java.lang.ClassLoader.loadClass(ClassLoader.java:504)
                                                                                    ... 22 more
                                                                         Caused by: java.lang.NoClassDefFoundError: Class not found using the boot class loader; no stack available

Answer 1

只需在gradle文件中添加dependencies constraint-layout

compile 'com.android.support.constraint:constraint-layout:1.0.2'