按照老師的代碼寫的，還是閃退。下面是錯誤代碼。
10-05 21:45:43.645 7552-7552/? E/AndroidRuntime: FATAL EXCEPTION: main
???????????????????????????????????????????????? Process: com.mengmengda.gridview, PID: 7552
???????????????????????????????????????????????? java.lang.RuntimeException: Unable to start activity ComponentInfo{com.mengmengda.gridview/com.mengmengda.gridview.MainActivity}: java.lang.ClassCastException: android.widget.GridLayout cannot be cast to android.widget.GridView
???????????????????????????????????????????????????? at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2330)
???????????????????????????????????????????????????? at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2392)
???????????????????????????????????????????????????? at android.app.ActivityThread.access$800(ActivityThread.java:154)
???????????????????????????????????????????????????? at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1308)
???????????????????????????????????????????????????? at android.os.Handler.dispatchMessage(Handler.java:102)
???????????????????????????????????????????????????? at android.os.Looper.loop(Looper.java:135)
???????????????????????????????????????????????????? at android.app.ActivityThread.main(ActivityThread.java:5273)
???????????????????????????????????????????????????? at java.lang.reflect.Method.invoke(Native Method)
???????????????????????????????????????????????????? at java.lang.reflect.Method.invoke(Method.java:372)
???????????????????????????????????????????????????? at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:908)
???????????????????????????????????????????????????? at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:703)
????????????????????????????????????????????????? Caused by: java.lang.ClassCastException: android.widget.GridLayout cannot be cast to android.widget.GridView
???????????????????????????????????????????????????? at com.mengmengda.gridview.MainActivity.onCreate(MainActivity.java:28)
???????????????????????????????????????????????????? at android.app.Activity.performCreate(Activity.java:6041)
???????????????????????????????????????????????????? at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1109)
???????????????????????????????????????????????????? at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2283)
???????????????????????????????????????????????????? at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2392)
???????????????????????????????????????????????????? at android.app.ActivityThread.access$800(ActivityThread.java:154)
???????????????????????????????????????????????????? at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1308)
???????????????????????????????????????????????????? at android.os.Handler.dispatchMessage(Handler.java:102)
???????????????????????????????????????????????????? at android.os.Looper.loop(Looper.java:135)
???????????????????????????????????????????????????? at android.app.ActivityThread.main(ActivityThread.java:5273)
???????????????????????????????????????????????????? at java.lang.reflect.Method.invoke(Native Method)
???????????????????????????????????????????????????? at java.lang.reflect.Method.invoke(Method.java:372)
???????????????????????????????????????????????????? at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:908)
???????????????????????????????????????????????????? at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:703)
2016-10-05
錯誤代碼中的第四行android.widget.GridLayout cannot be cast to android.widget.GridView的意思應該是你layout布局文件中的布局方式寫錯了，老師教程里用的是LineLayout，而你用的是GridLayout。所以說可能是GridLayout不居中不能用GridView控件。。然后我也是初學者，，只能說是可能是這個問題
2016-10-05
恩恩 ?那我也明白了，錯誤提示的是GridLayout不能被強制轉化為GridView，所以說在GridLayout中也能用GridView控件。。。