我之前做flutter開發視頻拍攝軟件的時候遇到過一個androidX編譯與運行時不同版本的問題，現在將當時的場景復原，以供大家參考。

引入 image_picker，以實現從手機系統選取視頻的功能。安卓端依次報錯：

• What went wrong:
  Execution failed for task ‘:app:preDebugBuild’.

Android dependency ‘androidx.core:core’ has different version for the compile (1.0.0) and runtime (1.1.0-alpha04) classpath. You should manually set the same version via DependencyResolution

• Try:
  Run with –stacktrace option to get the stack trace. Run with –info or –debug option to get more log output. Run with –scan to get full insights.
• Get more help at //help.gradle.org

FAILURE: Build failed with an exception.

• What went wrong:
  Execution failed for task ‘:app:preDebugBuild’.

  Android dependency ‘androidx.fragment:fragment’ has different version for the compile (1.0.0) and runtime (1.1.0-alpha04) classpath. You should manually set the same version via DependencyResolution

• Try:
  Run with –stacktrace option to get the stack trace. Run with –info or –debug option to get more log output. Run with –scan to get full insights.

• Get more help at //help.gradle.org

FAILURE: Build failed with an exception.

• What went wrong:
  Execution failed for task ‘:app:preDebugBuild’.

  Android dependency ‘androidx.lifecycle:lifecycle-viewmodel’ has different version for the compile (2.0.0) and runtime (2.1.0-alpha02) classpath. You should manually set the same version via DependencyResolution

• Try:
  Run with –stacktrace option to get the stack trace. Run with –info or –debug option to get more log output. Run with –scan to get full insights.

• Get more help at //help.gradle.org

sf、flutter issue給出的解決方案有：

//stackoverflow.com/questions/54823084/flutter-error-android-dependency-androidx-corecore-has-different-version-us

//github.com/flutter/flutter/issues/27254

//github.com/Sh1d0w/multi_image_picker/issues/78

//stackoverflow.com/questions/44653261/android-dependency-has-different-version-for-the-compile-and-runtime

給出的思路大體是：

• 部分插件未升級androidX、部分已升級androidX，此時需全部升級。pass，我的全是androidX
• 發現版本不一致的依賴，強制使用其中之一。pass，沒用

最后，我的解決方案是：

將androidx.legacy 依賴由 api換為 implementation。因為api定義的模塊依賴是可以被其他模塊使用的，而implementation定義的依賴只能在模塊內部使用，這樣就避免了沖突。

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dependencies {
    implementation 'androidx.legacy:legacy-support-v4:1.0.0'
}

分隔線

補充image_picker幾個問題

image_picker同其他插件一樣，凡是涉及平臺通道的，在兩個系統里表現都很難做到完全一致。

• IOS端，image_picker獲取的文件帶file://頭部，android端沒有，所以拿到文件地址后，如果要創建新的File對象，需要去掉該頭部。
• IOS端，因為權限問題，無法獲取應用外部文件的信息。所以需要將文件拷貝至應用內部，再操作。