ちょっと考えてみた37
API33で作成してましたが、API29（＝Android10.0）に落として書こうとおもったのですが、API33として記述したプログラムが、API29だと、Androidxに関するエラーがでてきてしまい、少しプログラミングから遠ざかってしまいました。
以下のようなエラーです。
6 issues were found when checking AAR metadata:
1. Dependency 'androidx.appcompat:appcompat-resources:1.6.0' requires libraries and applications that
depend on it to compile against version 33 or later of the
Android APIs.
:app is currently compiled against android-32.
Recommended action: Update this project to use a newer compileSdkVersion
of at least 33, for example 33.
Note that updating a library or application's compileSdkVersion (which
allows newer APIs to be used) can be done separately from updating
targetSdkVersion (which opts the app in to new runtime behavior) and
minSdkVersion (which determines which devices the app can be installed
on).
2. Dependency 'androidx.appcompat:appcompat:1.6.0' requires libraries and applications that
depend on it to compile against version 33 or later of the
Android APIs.
:app is currently compiled against android-32.
Recommended action: Update this project to use a newer compileSdkVersion
of at least 33, for example 33.
Note that updating a library or application's compileSdkVersion (which
allows newer APIs to be used) can be done separately from updating
targetSdkVersion (which opts the app in to new runtime behavior) and
minSdkVersion (which determines which devices the app can be installed
on).
3. Dependency 'androidx.activity:activity:1.6.0' requires libraries and applications that
depend on it to compile against version 33 or later of the
Android APIs.
:app is currently compiled against android-32.
Recommended action: Update this project to use a newer compileSdkVersion
of at least 33, for example 33.
Note that updating a library or application's compileSdkVersion (which
allows newer APIs to be used) can be done separately from updating
targetSdkVersion (which opts the app in to new runtime behavior) and
minSdkVersion (which determines which devices the app can be installed
on).
4. Dependency 'androidx.core:core-ktx:1.9.0' requires libraries and applications that
depend on it to compile against version 33 or later of the
Android APIs.
:app is currently compiled against android-32.
Recommended action: Update this project to use a newer compileSdkVersion
of at least 33, for example 33.
Note that updating a library or application's compileSdkVersion (which
allows newer APIs to be used) can be done separately from updating
targetSdkVersion (which opts the app in to new runtime behavior) and
minSdkVersion (which determines which devices the app can be installed
on).
5. Dependency 'androidx.core:core:1.9.0' requires libraries and applications that
depend on it to compile against version 33 or later of the
Android APIs.
:app is currently compiled against android-32.
Recommended action: Update this project to use a newer compileSdkVersion
of at least 33, for example 33.
Note that updating a library or application's compileSdkVersion (which
allows newer APIs to be used) can be done separately from updating
targetSdkVersion (which opts the app in to new runtime behavior) and
minSdkVersion (which determines which devices the app can be installed
on).
6. Dependency 'androidx.annotation:annotation-experimental:1.3.0' requires libraries and applications that
depend on it to compile against version 33 or later of the
Android APIs.
:app is currently compiled against android-32.
Recommended action: Update this project to use a newer compileSdkVersion
of at least 33, for example 33.
Note that updating a library or application's compileSdkVersion (which
allows newer APIs to be used) can be done separately from updating
targetSdkVersion (which opts the app in to new runtime behavior) and
minSdkVersion (which determines which devices the app can be installed
on).
対処としては、
build.gradle(Module)の中の
compileSdkとtargetSdkの数字を33に書き換えるとうまくいきました。
［調べていた時に、gradle.propertiesに
android.useAndroidX=true
に加え、
android.enableJetifier=true
の記載もというのを見かけましたが、これは必要なくてもよいようです。 ］
Android SDKを、API29 に置き換え、エミュレーターも置き換えました。これまでのコードも、上の対処だけでいけるかどうかチェックする予定です。
なぜAPI29 にするかですが、
今のAndroidスマホだとそれぐらいなのかなと思ったからです。
［持っているスマホは2台ありますが、
Aquos sense3 basicは、当初Android10でしたが、Android11.0に変更可能です。
