android - 由于约束布局，Android应用在启动时崩溃

Question

我尝试运行我的应用程序，但仍然出现此错误:

java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.nachum.pap/com.example.nachum.pap.MainMap}: android.view.InflateException: Binary XML file line #2: Error inflating class android.support.constraint.ConstraintLayout

我按照说明实施了约束布局，但没有帮助

我的xml:

<?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"
    android:background="@android:color/white"
    tools:context=".MainMap">

    <android.support.constraint.ConstraintLayout
        android:layout_width="@dimen/map_width"
        android:layout_height="@dimen/map_height"
        android:layout_marginEnd="8dp"
        android:layout_marginRight="8dp"
        android:background="@drawable/menu_map"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent">


        <!--
            The function "go to map" that activates in the onClick goes to the google maps activity and exists in MainMap java file
            The tag helps discern where on the map should the maps activity open.
        -->
        <Button
            android:id="@+id/MaalotButton"
            style="@android:style/Widget.Holo.Light.Button.Borderless.Small"
            android:layout_width="32dp"
            android:layout_height="10dp"
            android:layout_marginLeft="96dp"
            android:layout_marginTop="28dp"
            android:onClick="goToMap" android:tag="0"
            android:text="@string/PaPMaalot"
            android:textSize="8sp"
            app:layout_constraintLeft_toLeftOf="parent"
            app:layout_constraintTop_toTopOf="parent" />

        <Button
            android:id="@+id/ShderotButton"
            style="@android:style/Widget.Holo.Light.Button.Borderless.Small"
            android:layout_width="32dp"
            android:layout_height="10dp"
            android:layout_marginTop="24dp"
            android:layout_marginRight="10dp"
            android:onClick="goToMap" android:tag="1"
            android:text="@string/PaPShderot"
            android:textSize="8sp"
            app:layout_constraintRight_toRightOf="@+id/AshdodButton"
            app:layout_constraintTop_toBottomOf="@+id/AshdodButton" />

        <Button
            android:id="@+id/KfarVardimButton"
            style="@android:style/Widget.Holo.Light.Button.Borderless.Small"
            android:layout_width="46dp"
            android:layout_height="10dp"
            android:layout_marginRight="6dp"
            android:onClick="goToMap" android:tag="2"
            android:text="@string/PaPKfarVradim"
            android:textSize="8sp"
            app:layout_constraintRight_toRightOf="@+id/MaalotButton"
            app:layout_constraintTop_toBottomOf="@+id/MaalotButton" />

        <Button
            android:id="@+id/TalElButton"
            style="@android:style/Widget.Holo.Light.Button.Borderless.Small"
            android:layout_width="32dp"
            android:layout_height="10dp"
            android:layout_marginRight="8dp"
            android:onClick="goToMap" android:tag="3"
            android:text="@string/PaPTalEl"
            android:textSize="8sp"
            app:layout_constraintRight_toRightOf="@+id/KfarVardimButton"
            app:layout_constraintTop_toBottomOf="@+id/KfarVardimButton" />

        <Button
            android:id="@+id/CholonButton"
            style="@android:style/Widget.Holo.Light.Button.Borderless.Small"
            android:layout_width="32dp"
            android:layout_height="10dp"
            android:layout_marginTop="110dp"
            android:layout_marginRight="12dp"
            android:onClick="goToMap" android:tag="4"
            android:text="@string/PaPCholon"
            android:textSize="8sp"
            app:layout_constraintRight_toLeftOf="@+id/TalElButton"
            app:layout_constraintTop_toBottomOf="@+id/TalElButton" />

        <Button
            android:id="@+id/AshdodButton"
            style="@android:style/Widget.Holo.Light.Button.Borderless.Small"
            android:layout_width="32dp"
            android:layout_height="10dp"
            android:layout_marginTop="18dp"
            android:layout_marginRight="14dp"
            android:onClick="goToMap" android:tag="5"
            android:text="@string/PaPAshdod"
            android:textSize="8sp"
            app:layout_constraintRight_toRightOf="@+id/CholonButton"
            app:layout_constraintTop_toBottomOf="@+id/CholonButton" />

        <Button
            android:id="@+id/TfachotButton"
            style="@android:style/Widget.Holo.Light.Button.Borderless.Small"
            android:layout_width="32dp"
            android:layout_height="10dp"
            android:layout_marginTop="7dp"
            android:layout_marginRight="8dp"
            android:onClick="goToMap" android:tag="6"
            android:text="@string/PaPTfachot"
            android:textSize="8sp"
            app:layout_constraintRight_toRightOf="@+id/BarYochayButton7"
            app:layout_constraintTop_toBottomOf="@+id/BarYochayButton7" />

        <Button
            android:id="@+id/DaltonButton"
            style="@android:style/Widget.Holo.Light.Button.Borderless.Small"
            android:layout_width="32dp"
            android:layout_height="10dp"
            android:layout_marginLeft="8dp"
            android:onClick="goToMap" android:tag="7"
            android:text="@string/PaPDalton"
            android:textSize="8sp"
            app:layout_constraintLeft_toRightOf="@+id/MaalotButton"
            app:layout_constraintTop_toTopOf="@+id/MaalotButton" />

        <Button
            android:id="@+id/BarYochayButton7"
            style="@android:style/Widget.Holo.Light.Button.Borderless.Small"
            android:layout_width="38dp"
            android:layout_height="10dp"
            android:layout_marginTop="7dp"
            android:layout_marginRight="8dp"
            android:onClick="goToMap" android:tag="8"
            android:text="@string/PaPBarYochay"
            android:textSize="8sp"
            app:layout_constraintRight_toRightOf="@+id/DaltonButton"
            app:layout_constraintTop_toBottomOf="@+id/DaltonButton" />
    </android.support.constraint.ConstraintLayout>

</android.support.constraint.ConstraintLayout>

Java的

package com.example.nachum.pap;

import android.content.Intent;
import android.view.View;
import android.os.Bundle;
import android.widget.EditText;

import androidx.appcompat.app.AppCompatActivity;

public class MainMap extends AppCompatActivity {



    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main_map);
    }

    /** Called when the user taps the Send button */
    public void goToMap(View view) {
        Intent intent = new Intent(this, NAVDRAW.class);
        intent.putExtra("num", view.getTag().toString());
        startActivity(intent);
    }


}

日志猫:

07-15 06:13:44.064 20107-20107/? I/art: Late-enabling -Xcheck:jni
07-15 06:13:44.604 20107-20107/com.example.nachum.pap W/FirebaseApp: Default FirebaseApp failed to initialize because no default options were found. This usually means that com.google.gms:google-services was not applied to your gradle project.
07-15 06:13:44.604 20107-20107/com.example.nachum.pap I/FirebaseInitProvider: FirebaseApp initialization unsuccessful
07-15 06:13:44.634 20107-20107/com.example.nachum.pap I/InstantRun: starting instant run server: is main process
07-15 06:13:44.804 20107-20107/com.example.nachum.pap D/ContextHelper: convertTheme. context->name=com.example.nachum.pap themeResourceId=2131689478
07-15 06:13:44.874 20107-20107/com.example.nachum.pap W/art: Before Android 4.1, method android.graphics.PorterDuffColorFilter androidx.vectordrawable.graphics.drawable.VectorDrawableCompat.updateTintFilter(android.graphics.PorterDuffColorFilter, android.content.res.ColorStateList, android.graphics.PorterDuff$Mode) would have incorrectly overridden the package-private method in android.graphics.drawable.Drawable
07-15 06:13:44.944 20107-20107/com.example.nachum.pap D/PhoneWindow: [updateColorViews] sysUiVisibility=0x0
07-15 06:13:44.944 20107-20107/com.example.nachum.pap D/PhoneWindow: [updateColorViews] sysUiVisibility=0x0
07-15 06:13:44.944 20107-20107/com.example.nachum.pap D/PhoneWindow: [updateColorViews] sysUiVisibility=0x0
07-15 06:13:44.944 20107-20107/com.example.nachum.pap D/PhoneWindow: [updateColorViews] sysUiVisibility=0x0
07-15 06:13:44.944 20107-20107/com.example.nachum.pap I/PhoneWindow: [generateLayout] setColorNavigationBar => color=0x ff000001
07-15 06:13:44.944 20107-20107/com.example.nachum.pap D/PhoneWindow: [updateColorViews] sysUiVisibility=0x0
07-15 06:13:45.004 20107-20107/com.example.nachum.pap D/PhoneWindow: [updateColorViews] sysUiVisibility=0x0
07-15 06:13:45.004 20107-20107/com.example.nachum.pap D/PhoneWindowEx: [PWEx][generateLayout] setNavigationBarColor2 : colors=0xff000000
07-15 06:13:45.004 20107-20107/com.example.nachum.pap I/PhoneWindow: [setNavigationBarColor2] color=0x ff000000
07-15 06:13:45.004 20107-20107/com.example.nachum.pap D/PhoneWindow: [updateColorViews] sysUiVisibility=0x0
07-15 06:13:45.004 20107-20107/com.example.nachum.pap D/PhoneWindow: [updateColorViews] sysUiVisibility=0x0
07-15 06:13:45.054 20107-20107/com.example.nachum.pap I/art: Rejecting re-init on previously-failed class java.lang.Class<androidx.core.view.ViewCompat$OnUnhandledKeyEventListenerWrapper>
07-15 06:13:45.054 20107-20107/com.example.nachum.pap I/art: Rejecting re-init on previously-failed class java.lang.Class<androidx.core.view.ViewCompat$OnUnhandledKeyEventListenerWrapper>
07-15 06:13:45.214 20107-20107/com.example.nachum.pap D/AndroidRuntime: Shutting down VM
07-15 06:13:45.214 20107-20107/com.example.nachum.pap E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.example.nachum.pap, PID: 20107
    java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.nachum.pap/com.example.nachum.pap.MainMap}: android.view.InflateException: Binary XML file line #2: Error inflating class android.support.constraint.ConstraintLayout
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2306)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2366)
        at android.app.ActivityThread.access$800(ActivityThread.java:149)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1284)
        at android.os.Handler.dispatchMessage(Handler.java:102)
        at android.os.Looper.loop(Looper.java:135)
        at android.app.ActivityThread.main(ActivityThread.java:5297)
        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:908)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:703)
     Caused by: android.view.InflateException: Binary XML file line #2: Error inflating class android.support.constraint.ConstraintLayout
        at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:757)
        at android.view.LayoutInflater.inflate(LayoutInflater.java:482)
        at android.view.LayoutInflater.inflate(LayoutInflater.java:414)
        at android.view.LayoutInflater.inflate(LayoutInflater.java:365)
        at androidx.appcompat.app.AppCompatDelegateImpl.setContentView(AppCompatDelegateImpl.java:469)
        at androidx.appcompat.app.AppCompatActivity.setContentView(AppCompatActivity.java:140)
        at com.example.nachum.pap.MainMap.onCreate(MainMap.java:17)
        at android.app.Activity.performCreate(Activity.java:6020)
        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1105)
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2259)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2366) 
        at android.app.ActivityThread.access$800(ActivityThread.java:149) 
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1284) 
        at android.os.Handler.dispatchMessage(Handler.java:102) 
        at android.os.Looper.loop(Looper.java:135) 
        at android.app.ActivityThread.main(ActivityThread.java:5297) 
        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:908) 
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:703) 
     Caused by: java.lang.ClassNotFoundException: Didn't find class "android.support.constraint.ConstraintLayout" on path: DexPathList[[zip file "/data/app/com.example.nachum.pap-1/base.apk", zip file "/data/app/com.example.nachum.pap-1/split_lib_dependencies_apk.apk", zip file "/data/app/com.example.nachum.pap-1/split_lib_slice_0_apk.apk", zip file "/data/app/com.example.nachum.pap-1/split_lib_slice_1_apk.apk", zip file "/data/app/com.example.nachum.pap-1/split_lib_slice_2_apk.apk", zip file "/data/app/com.example.nachum.pap-1/split_lib_slice_3_apk.apk", zip file "/data/app/com.example.nachum.pap-1/split_lib_slice_4_apk.apk", zip file "/data/app/com.example.nachum.pap-1/split_lib_slice_5_apk.apk", zip file "/data/app/com.example.nachum.pap-1/split_lib_slice_6_apk.apk", zip file "/data/app/com.example.nachum.pap-1/split_lib_slice_7_apk.apk", zip file "/data/app/com.example.nachum.pap-1/split_lib_slice_8_apk.apk", zip file "/data/app/com.example.nachum.pap-1/split_lib_slice_9_apk.apk"],nativeLibraryDirectories=[/vendor/lib, /system/lib]]
        at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:511)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:469)
        at android.view.LayoutInflater.createView(LayoutInflater.java:571)
        at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:743)
        at android.view.LayoutInflater.inflate(LayoutInflater.java:482) 
        at android.view.LayoutInflater.inflate(LayoutInflater.java:414) 
        at android.view.LayoutInflater.inflate(LayoutInflater.java:365) 
        at androidx.appcompat.app.AppCompatDelegateImpl.setContentView(AppCompatDelegateImpl.java:469) 
        at androidx.appcompat.app.AppCompatActivity.setContentView(AppCompatActivity.java:140) 
        at com.example.nachum.pap.MainMap.onCreate(MainMap.java:17) 
        at android.app.Activity.performCreate(Activity.java:6020) 
        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1105) 
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2259) 
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2366) 
        at android.app.ActivityThread.access$800(ActivityThread.java:149) 
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1284) 
        at android.os.Handler.dispatchMessage(Handler.java:102) 
        at android.os.Looper.loop(Looper.java:135) 
        at android.app.ActivityThread.main(ActivityThread.java:5297) 
        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:908) 
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:703) 
        Suppressed: java.lang.ClassNotFoundException: android.support.constraint.ConstraintLayout
        at java.lang.Class.classForName(Native Method)
        at java.lang.BootClassLoader.findClass(ClassLoader.java:781)
        at java.lang.BootClassLoader.loadClass(ClassLoader.java:841)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:504)
                ... 22 more
     Caused by: java.lang.NoClassDefFoundError: Class not found using the boot class loader; no stack available

编辑:
应用程式gradle:

apply plugin: 'com.android.application'

android {
    compileSdkVersion 28
    defaultConfig {
        applicationId "com.example.nachum.pap"
        minSdkVersion 15
        targetSdkVersion 28
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'com.android.support:support-compat:28.0.0'
    implementation 'com.android.support:appcompat-v7:28.0.0'
    implementation 'com.android.support.constraint:constraint-layout:1.1.3'
    implementation 'com.google.android.gms:play-services-maps:17.0.0'
    implementation 'com.android.support:design:28.1.0'
    implementation 'com.google.firebase:firebase-database:18.0.0'
    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'com.android.support.test:runner:1.0.2'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
}

项目级别gradle:

// Top-level build file where you can add configuration options common to all sub-projects/modules.

buildscript {

    repositories {
        google()
        jcenter()
        maven { url "https://maven.google.com/"}
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.4.2'


        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

allprojects {
    repositories {
        google()
        jcenter()
    }
}

task clean(type: Delete) {
    delete rootProject.buildDir
}

Answer 1

您正在使用androidx.appcompat.app.AppCompatActivity，因此应使用androidx.constraintlayout.widget.ConstraintLayout而不是android.support.constraint.ConstraintLayout。

在build.gradle文件中，将implementation 'com.android.support.constraint:constraint-layout:1.1.3'替换为implementation 'androidx.constraintlayout:constraintlayout:1.1.3'