Error: failed to find target with hash string 'android-21'

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自闭症患者
自闭症患者 2021-02-13 21:03

I want to change my compileSdkVersion from 23 to 21.So I have made following changes in the build.gradle but I am getting following error.How can I resolve this?

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  • 2021-02-13 21:17

    Below is for Android studio 1. Go to app -> build.gradle -> change "compileSdkVersion 'installed sdk version'"

    1. Go to Tools -> Android -> sync project with gradle files

    That's it, problem solved:-)

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  • 2021-02-13 21:24

    Note: I think this might be a bug in Android Studio.


    1. Go to Project Structure
    2. Select App Module
    3. Under the first tab "Properties" change the Compile SDK Version to API XX from Google API xx (e.g. API 23 instead of Google API 23)
    4. Press OK
    5. Wait for the completion of on going process, in my case I did not get an error at this point.
    6. Now revert Compiled Sdk Version back to Google API xx.

    If this not work, then:

    1. With Google API (Google API xx instead of API xx), lower the build tool version (e.g. Google API 23 and build tool version 23.0.1)
    2. Press Ok and wait for completion of on going process
    3. Revert back your build tool version to what it was before you changed
    4. Press Ok and Wait for the completion of process.
    5. Done!
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  • 2021-02-13 21:25

    This error I also getting again and again when I import other's project. So I resolve to change some in Gradle file according to my system.

    compileSdkVersion 23
    buildToolsVersion "23.0.2"
    

    Which I have already installed in my system.

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  • 2021-02-13 21:25

    Just check android home environment variable, it should be : path/../path/sdk and not : path/.../path/sdk/tools example: android home path is : /home/username/android/sdk you should put the following lines to .bashrc file in user home directory:

     ANDROID_HOME='/home/username/android/sdk'
     PATH="$HOME:$HOME/bin:$ANDROID_HOME/tools:$PATH"
     export ANDROID_HOME
     export PATH
    
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  • 2021-02-13 21:26

    You are using

     compile 'com.android.support:appcompat-v7:23.0.1'
    

    So you have to compile with API 23.
    Change your compileSdkVersion in your build.gradle file

     compileSdkVersion 23
    
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  • 2021-02-13 21:29

    Go to you Android SDK dir and install it properly:

    tools/android update sdk
    

    or

    tools/android update sdk --no-ui
    
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