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

[qq_38332732]

<?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>

[ganshenml]

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。

[qq_38332732]

logcat提示空指针异常和

[qq_38332732]

logcat FATAL 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) 

[m0_37423505]

你好，你解决了吗？我也碰到这个问题了

[落羽寒]

我也遇到了这个问题，请问你的这个问题是怎么解决的？

[shixieshenjian]

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