更改android API的正确方法

Question

我正在尝试使用 android studio 将 Android API 从 23 降低到 16，但在项目运行时出现错误。我已经安装了 sdk 版本 18。

之前

apply plugin: 'com.android.application'

android {
    compileSdkVersion 23
    buildToolsVersion "23.0.2"


    defaultConfig {
        applicationId "com.example.project.myapplication"
        minSdkVersion 15
        targetSdkVersion 23
        versionCode 1
        versionName "1.0"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    compile 'com.android.support:appcompat-v7:23.1.0'
    compile 'org.jbundle.util.osgi.wrapped:org.jbundle.util.osgi.wrapped.org.apache.http.client:4.1.2'

}

之后

apply plugin: 'com.android.application'

android {
    compileSdkVersion 16
    buildToolsVersion "23.0.2"


    defaultConfig {
        applicationId "com.example.project.myapplication"
        minSdkVersion 15
        targetSdkVersion 23
        versionCode 1
        versionName "1.0"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    compile fileTree(include: ['*.jar'], dir: 'libs')
    compile 'com.android.support:appcompat-v7:23.1.0'
    compile 'org.jbundle.util.osgi.wrapped:org.jbundle.util.osgi.wrapped.org.apache.http.client:4.1.2'
}

错误

  Error:(231, 62) error: diamond operator is not supported in -source 1.6
(use -source 7 or higher to enable diamond operator)

清理项目后

C:\Users\tongws\AndroidStudioProjects\MyApplication1\app\build\intermediates\exploded-aar\com.android.support\appcompat-v7\23.1.0\res\values-ldltr-v21\values-ldltr-v21.xml
Error:(2) Error retrieving parent for item: No resource found that matches the given name 'android:Widget.Material.Spinner.Underlined'.
C:\Users\tongws\AndroidStudioProjects\MyApplication1\app\build\intermediates\exploded-aar\com.android.support\appcompat-v7\23.1.0\res\values-ldrtl-v23\values-ldrtl-v23.xml
Error:(2) Error retrieving parent for item: No resource found that matches the given name 'android:Widget.Material.Spinner.Underlined'.
C:\Users\tongws\AndroidStudioProjects\MyApplication1\app\build\intermediates\exploded-aar\com.android.support\appcompat-v7\23.1.0\res\values-v17\values-v17.xml
C:\Users\tongws\AndroidStudioProjects\MyApplication1\app\build\intermediates\exploded-aar\com.android.support\appcompat-v7\23.1.0\res\values-v21\values-v21.xml
Error:(2) Error retrieving parent for item: No resource found that matches the given name 'android:TextAppearance.Material.Inverse'.
Error:(2) Error retrieving parent for item: No resource found that matches the given name 'android:TextAppearance.Material.Medium.Inverse'.
Error:(2) Error retrieving parent for item: No resource found that matches the given name 'android:TextAppearance.Material.Large.Inverse'.
Error:(2) Error retrieving parent for item: No resource found that matches the given name 'android:TextAppearance.Material.Small.Inverse'.
Error:(2) Error retrieving parent for item: No resource found that matches the given name 'android:Widget.Material.ProgressBar'.
Error:(2) Error retrieving parent for item: No resource found that matches the given name 'android:Widget.Material.ProgressBar.Horizontal'.

谁能告诉我如何解决这个问题？

Answer 1

您的问题是您正在使用较低的 SDK 编译您的应用

compileSdkVersion 18

在 SDK 版本 18 中，您不支持 Material Desgin：

<style name="Base.Widget.AppCompat.Spinner.Underlined" parent="android:Widget.Material.Spinner.Underlined"/>

您还可以通过在 Gradle 构建中添加此依赖项来将 Material Design 集成到您的应用中：

compile "com.android.support:appcompat-v7:21.0.+"

查看此链接： android-developers

你得到这个：

C:\Users\tongws\AndroidStudioProjects\MyApplication1\app\build\intermediates\exploded-aar\com.android.support\appcompat-v7\23.1.0\res\values-ldltr-v21\values-ldltr-v21.xml
Error:(2) Error retrieving parent for item: No resource found that matches the given name 'android:Widget.Material.Spinner.Underlined'.
C:\Users\tongws\AndroidStudioProjects\MyApplication1\app\build\intermediates\exploded-aar\com.android.support\appcompat-v7\23.1.0\res\values-ldrtl-v23\values-ldrtl-v23.xml
Error:(2) Error retrieving parent for item: No resource found that matches the given name 'android:Widget.Material.Spinner.Underlined'.
C:\Users\tongws\AndroidStudioProjects\MyApplication1\app\build\intermediates\exploded-aar\com.android.support\appcompat-v7\23.1.0\res\values-v17\values-v17.xml
C:\Users\tongws\AndroidStudioProjects\MyApplication1\app\build\intermediates\exploded-aar\com.android.support\appcompat-v7\23.1.0\res\values-v21\values-v21.xml
Error:(2) Error retrieving parent for item: No resource found that matches the given name 'android:TextAppearance.Material.Inverse'.
Error:(2) Error retrieving parent for item: No resource found that matches the given name 'android:TextAppearance.Material.Medium.Inverse'.
Error:(2) Error retrieving parent for item: No resource found that matches the given name 'android:TextAppearance.Material.Large.Inverse'.
Error:(2) Error retrieving parent for item: No resource found that matches the given name 'android:TextAppearance.Material.Small.Inverse'.
Error:(2) Error retrieving parent for item: No resource found that matches the given name 'android:Widget.Material.ProgressBar'.
Error:(2) Error retrieving parent for item: No resource found that matches the given name 'android:Widget.Material.ProgressBar.Horizontal'.

因为编译器找不到资源，所以我从链接发布的解决方案是旧的并且它没有这些资源。可能是您使用的资源是在较新版本的 AppCompact 中添加的，因此您需要在 android studio 中创建一个新的应用程序项目并复制 java 文件或更改设计以支持较低的 SDK

还要检查您是否从 Android SDK 管理器下载了 SDK。 如果你想在你的应用中使用它们，你需要这些工具和资源