build gradle err!

[工作需要、小号。]

sync failed	2 m 21 s 26 ms
Run build	2 m 20 s 764 ms
Load build	66 ms
Configure build	100 ms
allprojects
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/Users/z/code/tensorflow-for-poets-2/android/tflite
app/build.gradle
Unable to resolve dependency for ':app@debug/compileClasspath': Could not download tensorflow-lite.aar (org.tensorflow:tensorflow-lite:1.12.0)
Unable to resolve dependency for ':app@debugAndroidTest/compileClasspath': Could not download tensorflow-lite.aar (org.tensorflow:tensorflow-lite:1.12.0)
Unable to resolve dependency for ':app@debugUnitTest/compileClasspath': Could not download tensorflow-lite.aar (org.tensorflow:tensorflow-lite:1.12.0)
Unable to resolve dependency for ':app@release/compileClasspath': Could not download tensorflow-lite.aar (org.tensorflow:tensorflow-lite:1.12.0)
Unable to resolve dependency for ':app@releaseUnitTest/compileClasspath': Could not download tensorflow-lite.aar (org.tensorflow:tensorflow-lite:1.12.0)

Unable to resolve dependency for ':app@debug/compileClasspath': Could not download tensorflow-lite.aar (org.tensorflow:tensorflow-lite:1.12.0)
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Unable to resolve dependency for ':app@debugAndroidTest/compileClasspath': Could not download tensorflow-lite.aar (org.tensorflow:tensorflow-lite:1.12.0)
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Unable to resolve dependency for ':app@debugUnitTest/compileClasspath': Could not download tensorflow-lite.aar (org.tensorflow:tensorflow-lite:1.12.0)
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Unable to resolve dependency for ':app@release/compileClasspath': Could not download tensorflow-lite.aar (org.tensorflow:tensorflow-lite:1.12.0)
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Unable to resolve dependency for ':app@releaseUnitTest/compileClasspath': Could not download tensorflow-lite.aar (org.tensorflow:tensorflow-lite:1.12.0)
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[工作需要、小号。]

1, my gradle version is 4.6 .
in project.gradle :
change`dependencies {
classpath 'com.android.tools.build:gradle:3.0.0'

    // NOTE: Do not place your application dependencies here; they belong
    // in the individual module build.gradle files
}`

to:
`dependencies {
classpath 'com.android.tools.build:gradle:3.2.1'

    // NOTE: Do not place your application dependencies here; they belong
    // in the individual module build.gradle files
}`

2, delete <uses-sdk android:minSdkVersion="21" /> this code line in manifest.xml
3, change compile to implementation in app.gradle(Module gradle)

[Philip Wu]

Below is my solution.
Environment: ubuntu 18.04 + android studio 3.3.1

1. change dependencies { classpath 'com.android.tools.build:gradle:3.3.1 } in build.gradle(Project: tflite)
2. delete <uses-sdk android:minSdkVersion="21" /> in manifest.xml
3. change compile to implementation in build.gradle(Module:app)
4. delete testCompile 'junit:junit:4.12' in build.gradle(Module:app)
5. delete buildToolsVersion '27.0.3' in build.gradle(Module:app)
6. delete androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', { exclude group: 'com.android.support', module: 'support-annotations' }) in build.gradle(Module:app)