Learning to learn the necessary knowledge of a simple example

GridViewSingleSelectorDomo
..........................\.gitignore
..........................\.gradle
..........................\.......\2.14.1
..........................\.......\......\taskArtifacts
..........................\.......\......\.............\cache.properties
..........................\.......\......\.............\cache.properties.lock
..........................\.......\......\.............\fileHashes.bin
..........................\.......\......\.............\fileSnapshots.bin
..........................\.......\......\.............\fileSnapshotsToTreeSnapshotsIndex.bin
..........................\.......\......\.............\taskArtifacts.bin
..........................\.......\......\tasks
..........................\.......\......\.....\_app_compileDebugJavaWithJavac
..........................\.......\......\.....\..............................\localClassSetAnalysis
..........................\.......\......\.....\..............................\.....................\localClassSetAnalysis.bin
..........................\.......\......\.....\..............................\.....................\localClassSetAnalysis.lock
..........................\.......\......\.....\..............................\localJarClasspathSnapshot
..........................\.......\......\.....\..............................\.........................\localJarClasspathSnapshot.bin
..........................\.......\......\.....\..............................\.........................\localJarClasspathSnapshot.lock
..........................\.idea
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..........................\.....\copyright
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..........................\.....\gradle.xml
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..........................\.....\.........\animated_vector_drawable_25_1_0.xml
..........................\.....\.........\appcompat_v7_25_1_0.xml
..........................\.....\.........\espresso_core_2_2_2.xml
..........................\.....\.........\espresso_idling_resource_2_2_2.xml
..........................\.....\.........\exposed_instrumentation_api_publish_0_5.xml
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..........................\.....\.........\hamcrest_library_1_3.xml
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..........................\.....\.........\junit_4_12.xml
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..........................\.....\.........\support_core_ui_25_1_0.xml
..........................\.....\.........\support_core_utils_25_1_0.xml
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..........................\.....\.........\support_media_compat_25_1_0.xml
..........................\.....\.........\support_v4_25_1_0.xml
..........................\.....\.........\support_vector_drawable_25_1_0.xml
..........................\.....\misc.xml
..........................\.....\modules.xml
..........................\.....\runConfigurations.xml
..........................\.....\workspace.xml
..........................\app
..........................\...\.gitignore
..........................\...\app.iml
..........................\...\build
..........................\...\.....\generated
..........................\...\.....\.........\assets
..........................\...\.....\.........\......\shaders
..........................\...\.....\.........\......\.......\debug
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