为什么我不能使用较低的API编译android studio项目？

Question

我用Android Studio用API 25（牛轧糖）制作了一个简单的应用程序，但现在我想为API 21（Lollipop）构建一个APK，所以我将项目结构中的“编译SDK版本”更改为API 21，但Android Studio给了我以下错误：

D:\AndroidStudioProject\ArduinoData\app\build\intermediates\res\merged\debug\values-v23\values-v23.xml
Error:(4) Error retrieving parent for item: No resource found that matches the given name 'android:TextAppearance.Material.Widget.Button.Inverse'.
Error:(34) Error retrieving parent for item: No resource found that matches the given name 'android:Widget.Material.Button.Colored'.
Error:(4) Error retrieving parent for item: No resource found that matches the given name 'android:TextAppearance.Material.Widget.Button.Inverse'.
Error:(34) Error retrieving parent for item: No resource found that matches the given name 'android:Widget.Material.Button.Colored'.
D:\AndroidStudioProject\ArduinoData\app\build\intermediates\res\merged\debug\values-v24\values-v24.xml
Error:(3) Error retrieving parent for item: No resource found that matches the given name 'android:TextAppearance.Material.Widget.Button.Borderless.Colored'.
Error:(4) Error retrieving parent for item: No resource found that matches the given name 'android:TextAppearance.Material.Widget.Button.Colored'.
Error:(3) Error retrieving parent for item: No resource found that matches the given name 'android:TextAppearance.Material.Widget.Button.Borderless.Colored'.
Error:(4) Error retrieving parent for item: No resource found that matches the given name 'android:TextAppearance.Material.Widget.Button.Colored'.
Error:Execution failed for task ':app:processDebugResources'.
> com.android.ide.common.process.ProcessException: Failed to execute aapt

我知道这可能是一个图形不兼容，但我不知道如何解决它，所以你有任何想法来修复它吗？

styles.xml

<resources>

    <!-- Base application theme. -->
    <style name="AppTheme" parent="Theme.AppCompat">
        <!-- Customize your theme here.
        <item name="colorPrimary">@color/colorPrimary</item>
        <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
        <item name="colorAccent">@color/colorAccent</item>-->
    </style>

</resources>

build.grandle

apply plugin: 'com.android.application'

android {
    compileSdkVersion 21
    buildToolsVersion '21.1.2'
    defaultConfig {
        applicationId "com.acerbisgianluca.arduinodata"
        minSdkVersion 21
        targetSdkVersion 21
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
    productFlavors {
    }
    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_6
        targetCompatibility JavaVersion.VERSION_1_6
    }
}

dependencies {
    compile fileTree(include: ['*.jar'], dir: 'libs')
    androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
        exclude group: 'com.android.support', module: 'support-annotations'
    })
    compile 'com.android.support:appcompat-v7:21.0.2'
    compile 'com.android.support.constraint:constraint-layout:1.0.2'
    compile 'com.google.firebase:firebase-messaging:10.0.1'
    compile 'com.google.firebase:firebase-ads:10.0.1'
    compile 'com.google.firebase:firebase-core:10.0.1'
    testCompile 'junit:junit:4.12'
}
apply plugin: 'com.google.gms.google-services'

Answer 1

我认为您已经在应用程序级别的构建中编写了编译器DKVersion 21和TargetSDKVVersion 25。格雷德尔档案。targetSdkVersion不应高于compileSdkVersion。您做得很正确，但没有将更新添加到API级别21的buildToolsVersion和appcompatlibrary版本中。

将buildToolsVersion更改为21.1.2

在应用程序级构建中将appcompat库版本更改为21.0.2。格雷德尔档案。您必须按照API级别21更新库版本。

我想这会解决你的问题。