解决Android初学者创建时遇到Could not find any version that matches com.android.support:appcompat-v7:29.+. Vers

将app下build.gradle文件中dependencies {implementation fileTree(dir: \'libs\', include: [\'*.jar\'])implementation \'com.android.support:appcompat-v7:29.+\'implementation \'com.android.support.constraint:constraint-layout: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\'}修改为dependencies {

implementation fileTree(dir: \'libs\', include: [\'*.jar\'])implementation \'com.android.support:appcompat-v7:+\'implementation \'com.android.support.constraint:constraint-layout: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\'}如果出现Dex file with version \'38\' cannot be used with min sdk level \'29\'.类似的错误修改同文件下

android {compileSdkVersion 29defaultConfig {applicationId \"com.example.z.test1\"minSdkVersion 29targetSdkVersion 29versionCode 1versionName \"1.0\"testInstrumentationRunner \"android.support.test.runner.AndroidJUnitRunner\"}降低版本，我这边写为15

android {compileSdkVersion 29defaultConfig {applicationId \"com.example.z.test1\"minSdkVersion 15targetSdkVersion 29versionCode 1versionName \"1.0\"testInstrumentationRunner \"android.support.test.runner.AndroidJUnitRunner\"}