Crash on Android 10 (InflateException in layout/abc_screen_simple line #17)

问题

My application works fine from Android 4.3 until Android 9 Pie, but my application doesn't work on Android 10 (Q API 29) and crashes. This is my logcat - why this is happening?

java.lang.RuntimeException: Unable to start activity 
     ComponentInfo{ir.mahdi.circulars/ir.mahdi.circulars.MainActivity}: 
     android.view.InflateException: Binary XML file line #17 
     in ir.mahdi.circulars:layout/abc_screen_simple: Binary XML file line #17 
     in ir.mahdi.circulars:layout/abc_screen_simple: 
         Error inflating class androidx.appcompat.widget.FitWindowsLinearLayout

and this is my mainActivity.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.coordinatorlayout.widget.CoordinatorLayout 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="@color/white"
    android:layoutDirection="ltr"
    tools:context=".MainActivity">


</androidx.coordinatorlayout.widget.CoordinatorLayout>

update

apply plugin: 'com.android.application'

android {
    compileSdkVersion 29
    defaultConfig {
        minSdkVersion 16
        targetSdkVersion 29
        multiDexEnabled true
        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    } }

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'androidx.appcompat:appcompat:1.0.0'
    implementation 'com.google.android.material:material:1.0.0'
    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'androidx.test:runner:1.2.0'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0' }

回答1:

Update Calligraphy to newest version to solve this problem: Link: https://github.com/InflationX/Calligraphy/issues/35

More specifically, both Calligraphy and ViewPump need to be updated:

implementation 'io.github.inflationx:calligraphy3:3.1.1'
implementation 'io.github.inflationx:viewpump:2.0.3'

Migrating from Calligraphy 2 to 3 requires some code changes; see examples in Calligraphy 3 README.

回答2:

if you are using calligraphy so you should migrate to calligraphy3 : https://github.com/InflationX/Calligraphy

implementation 'io.github.inflationx:calligraphy3:3.1.1'
implementation 'io.github.inflationx:viewpump:2.0.3'

回答3:

Definitively your problem is the Calligraphy library, I've got the same problem and there are 2 ways to solve it:

1. Go back to target version 28, and wait a possible update of the Calligraphy library. 2
2. Remove the library

About the exception:

The exception error in Calligraphy comes from the use of the reflection in the library. See the last line of this exception:

E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example, PID: 8220
android.view.InflateException: Binary XML file line #17 in com.example:layout/abc_screen_simple: Binary XML file line #17 in com.example/abc_screen_simple: Error inflating class androidx.appcompat.widget.FitWindowsLinearLayout
Caused by: android.view.InflateException: Binary XML file line #17 in com.example/abc_screen_simple: Error inflating class androidx.appcompat.widget.FitWindowsLinearLayout
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.Object java.lang.reflect.Field.get(java.lang.Object)' on a null object reference

Android in your documentation explain that some reflection methods (non-SDK interfaces) are restricted in the API 29 platform.

Reflection via Class.getDeclaredField() or Class.getField() --------> NoSuchFieldException thrown

Reflection via Class.getDeclaredMethod(), Class.getMethod() ----> NoSuchMethodException thrown.

Reflection via Class.getDeclaredFields(), Class.getFields() --------> Non-SDK members not in results.

Reflection via Class.getDeclaredMethods(), Class.getMethods() -> Non-SDK members not in results

Source: Restrictions on non-SDK interfaces

回答4:

You can change buildTools version and sdk version from 29 to 28

    targetSdk = 28
    compileSdk = 28
    buildTools = '28.0.3'

回答5:

When faced with this issue, just update the calligraphy and viewpump in your app gradle to the latest version. Presently, the current version is: implementation 'io.github.inflationx:calligraphy3:3.1.1' implementation 'io.github.inflationx:viewpump:2.0.3'

回答6:

Migrate from chrisjenx/Calligraphy to InflationX/Calligraphy and update Calligraphy to newest version

来源：https://stackoverflow.com/questions/56524914/crash-on-android-10-inflateexception-in-layout-abc-screen-simple-line-17