android failed to instantiate one or more classes 布局老提示这个

Question

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.example.lbstest.MainActivity">    <com.baidu.mapapi.map.MapView
        android:id="@+id/mapView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:clickable="true"/></android.support.constraint.ConstraintLayout>

Answer 1

这里不是已经提示了么。mapview是百度的sdk控件，不是系统控件，所以无法初始化，等到运行时才初始化。

Answer 2

logcat提示空指针异常和

Answer 3

logcatFATAL EXCEPTION: main
                                                                                 Process: com.example.administrator.test726, PID: 4958
                                                                                 java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.administrator.test726/com.example.administrator.test726.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String android.os.Bundle.getString(java.lang.String)' 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: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String android.os.Bundle.getString(java.lang.String)' on a null object reference
                                                                                     at com.baidu.platform.comapi.util.PermissionCheck.init(Unknown Source)
                                                                                     at com.baidu.platform.comapi.a.c(Unknown Source)
                                                                                     at com.baidu.platform.comapi.c.a(Unknown Source)
                                                                                     at com.baidu.mapapi.SDKInitializer.initialize(Unknown Source)
                                                                                     at com.baidu.mapapi.SDKInitializer.initialize(Unknown Source)
                                                                                     at com.example.administrator.test726.MainActivity.onCreate(MainActivity.java:47)
                                                                                     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)

Answer 4

博主解决了吗，我也是在用高德德图MapView中的布局出现同一个问题，也不知道怎么破，只要去掉mapView就不显示这个错了