Getting Started with Android - Build your first app

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App/SRC /main/res/layout is the layout file

App/SRC/main/AndroidManifest. The specified XML entry acitivity

<activity android:name=".MainActivity">
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If the name is devilsm.example.com, so app/SRC/main/Java/com/example/devilsm/diceroller is the activity of the code

The onCreate method

setContentView(R.layout.activity_main)
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Load the view

Androidmanifest.xml specifies the activity, and then the activity loads the view

## Problem encountered in app/build.gradle

implementation"org.jetbrains.kotlin:kotlin-stdlib-jre7:$kotlin_version
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Instead of

implementation"org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version
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