将Apache POI添加为外部库后，应用程序立即崩溃

Question

I'm writing an application that utilizes Apache poi as external libraries so that I am able to generate excel files using data generated on the app. However, after adding the apache jars to my lib folder and implementing them on my app build.gradle, I receive various DexArchiveBuilderExceptions.

I've attempted to invalidate my caches and restart, as well as set my project to source compatibility Java_1_8; however, I still receive the same errors.

android {
    compileSdkVersion 28
    buildToolsVersion "29.0.0"

    defaultConfig {
        applicationId "com.example.statstopwatch"
        minSdkVersion 15
        targetSdkVersion 28
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }

    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }

    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }
}


dependencies {
    implementation 'com.android.support:appcompat-v7:28.0.0'
    implementation 'com.android.support.constraint:constraint-layout:1.1.3'
    implementation 'com.jjoe64:graphview:4.2.2'
    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'
    implementation files('libs/poi-4.1.0.jar')
    implementation files('libs/poi-examples-4.1.0.jar')
    implementation files('libs/poi-excelant-4.1.0.jar')
    implementation files('libs/poi-ooxml-4.1.0.jar')
    implementation files('libs/poi-ooxml-schemas-4.1.0.jar')
    implementation files('libs/poi-scratchpad-4.1.0.jar')
}

I added these external libraries by pasting them into the libs folder and adding them as libraries, is this perhaps the cause of the error?

Answer 1

You need to raise your minSdkVersion to 26, as those libraries are using things from Java 8 that are only available on Android 8.0 and higher.

Or, find a version of those libraries that either are older or are designed for Android, that might allow you to keep your current minSdkVersion .