Attempt to invoke virtual method 'void android.widget.TextView.setText錯誤
阿新 • • 發佈：2018-12-02
整了接近一個小時的錯誤，有時候不能僅僅因為AS的報錯就跟著報錯語句zhao找原因，有時候可能因為隨著一個Activity的增多，導致很多長得相似（比如userName，user_name,tv_userName,tv_user_name），此時你找到的id並不是對應介面所具有的id，也就是說是別的介面的id，自然你找不到這個東西，更別提給他賦值了。as的自動提示可能會導致你的誤判，然後就是寫程式的時候一定要認真。
11-22 15:11:46.932 1279-1279/dachen.mr.movingone.registerandlogin E/AndroidRuntime: FATAL EXCEPTION: main Process: dachen.mr.movingone.registerandlogin, PID: 1279 java.lang.RuntimeException: Unable to start activity ComponentInfo{dachen.mr.movingone.registerandlogin/dachen.mr.movingone.registerandlogin.UserInfoActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.TextView.setText(java.lang.CharSequence)' on a null object reference at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2325) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2387) at android.app.ActivityThread.access$800(ActivityThread.java:151) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303) at android.os.Handler.dispatchMessage(Handler.java:102) at android.os.Looper.loop(Looper.java:135) at android.app.ActivityThread.main(ActivityThread.java:5254) 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:903) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698) Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.TextView.setText(java.lang.CharSequence)' on a null object reference at dachen.mr.movingone.registerandlogin.UserInfoActivity.setValue(UserInfoActivity.java:77) at dachen.mr.movingone.registerandlogin.UserInfoActivity.initData(UserInfoActivity.java:55) at dachen.mr.movingone.registerandlogin.UserInfoActivity.onCreate(UserInfoActivity.java:41) at android.app.Activity.performCreate(Activity.java:5990) at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2278) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2387) at android.app.ActivityThread.access$800(ActivityThread.java:151) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303) at android.os.Handler.dispatchMessage(Handler.java:102) at android.os.Looper.loop(Looper.java:135) at android.app.ActivityThread.main(ActivityThread.java:5254) at java.lang.reflect.Method.invoke(Native Method)