点击登录报错

看不懂这块哪里出问题了，按照视频写的代码点击后报错

sd_单子 2017-05-25

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3回答

i爱自然回答被采纳获得+3积分 2017-05-25 12:00:35

你好，这里点击按钮跳转到LoginActivity的界面时，需要保证LoginActivity已经在清单文件AndroidManifest.xml中进行了注册，否则在跳转时就会报错。可以参考注册方式：如果我的回答解决了您的疑惑，请采纳，祝学习愉快~

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sd_单子提问者 #1

非常感谢！是自要涉及跳转都需要在这里注册吧

2017-05-25 14:20:44
i爱自然回复提问者 sd_单子 #2

你好，工程中的所有用到的Activity界面都需要在清单文件中注册的，祝学习愉快~

2017-05-25 15:25:12
湛歌 #3

我已尽在AndroidManifest.xml注册了，但是点击登陆仍然报错

2017-06-27 23:26:44

湛歌 2017-06-28 22:26:24

Process: activitytest.example.com.imtao, PID: 2724
java.lang.RuntimeException: Unable to start activity ComponentInfo{activitytest.example.com.imtao/activitytest.example.com.imtao.LoginActivity}: android.view.InflateException: Binary XML file line #46: Attempt to invoke virtual method 'boolean java.lang.String.equals(java.lang.Object)' on a null object reference
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2665)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2726)
at android.app.ActivityThread.-wrap12(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1477)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6119)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)
Caused by: android.view.InflateException: Binary XML file line #46: Attempt to invoke virtual method 'boolean java.lang.String.equals(java.lang.Object)' on a null object reference
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'boolean java.lang.String.equals(java.lang.Object)' on a null object reference
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:761)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:727)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:858)
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:821)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:861)
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:821)
at android.view.LayoutInflater.inflate(LayoutInflater.java:518)
at android.view.LayoutInflater.inflate(LayoutInflater.java:426)
at android.view.LayoutInflater.inflate(LayoutInflater.java:377)
at android.support.v7.app.AppCompatDelegateImplV9.setContentView(AppCompatDelegateImplV9.java:292)
at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:140)
at activitytest.example.com.imtao.LoginActivity.onCreate(LoginActivity.java:11)
at android.app.Activity.performCreate(Activity.java:6679)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1118)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2618)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2726)
at android.app.ActivityThread.-wrap12(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1477)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6119)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)

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