报错详细信息
E/AndroidRuntime: FATAL EXCEPTION: main
Process: top.baixiaoshengzjj.mygraduationapplication, PID: 32630
java.lang.RuntimeException: Unable to start activity ComponentInfo{top.baixiaoshengzjj.mygraduationapplication/top.baixiaoshengzjj.mygraduationapplication.LoginActivity}: android.view.InflateException: Binary XML file line #141 in top.baixiaoshengzjj.mygraduationapplication:layout/login_page: Binary XML file line #141 in top.baixiaoshengzjj.mygraduationapplication:layout/login_page: Error inflating class null
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3773)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3952)
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:91)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:149)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:103)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2386)
at android.os.Handler.dispatchMessage(Handler.java:107)
at android.os.Looper.loop(Looper.java:213)
at android.app.ActivityThread.main(ActivityThread.java:8169)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:513)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1101)
Caused by: android.view.InflateException: Binary XML file line #141 in top.baixiaoshengzjj.mygraduationapplication:layout/login_page: Binary XML file line #141 in top.baixiaoshengzjj.mygraduationapplication:layout/login_page: Error inflating class null
Caused by: android.view.InflateException: Binary XML file line #141 in top.baixiaoshengzjj.mygraduationapplication:layout/login_page: Error inflating class null
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.tryCreateView(LayoutInflater.java:1064)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:1007)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:971)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:1133)
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:1094)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:1136)
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:1094)
at android.view.LayoutInflater.inflate(LayoutInflater.java:692)
at android.view.LayoutInflater.inflate(LayoutInflater.java:536)
at android.view.LayoutInflater.inflate(LayoutInflater.java:483)
at androidx.appcompat.app.AppCompatDelegateImpl.setContentView(AppCompatDelegateImpl.java:696)
at androidx.appcompat.app.AppCompatActivity.setContentView(AppCompatActivity.java:170)
at top.baixiaoshengzjj.mygraduationapplication.LoginActivity.onCreate(LoginActivity.java:14)
at android.app.Activity.performCreate(Activity.java:8086)
at android.app.Activity.performCreate(Activity.java:8074)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1313)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3746)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3952)
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:91)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:149)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:103)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2386)
at android.os.Handler.dispatchMessage(Handler.java:107)
at android.os.Looper.loop(Looper.java:213)
at android.app.ActivityThread.main(ActivityThread.java:8169)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:513)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1101)
原因：布局文件中的 View 控件忘了大写
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