Android Howto

ADT installation etc

http://www.kkaneko.com/rinkou/js/eclipseadt.html

Android Virtual Device (AVD)

• Use 2.7QVGA. This one is quite fast. Use ram <= 512MB
  • Can do telnet to this default Android device emulator.
  • telnet localhost 5554
  • network speed edge
  • network speed full
  • power capacity 5
  • power status not-charging
  • Open map application, then: geo fix 0.00 40.00
  • sms send 3015555555 "This is a text message"

Genymotion

• The default android device emulator is too slow. Use: http://www.kkaneko.com/rinkou/js/vmandroid.html
• But, cannot do telnet to the device emulator using Genymotion.
• If something strange happen, kill -KILL adb process.
• adb devices
• Portrait orientation seems faster than landscape orientation
• Eclipse plugin for genymotion.

Debug

• If "Device supports x86, but APK only supports armeabi-v7a", then try:
  • Build tab -> Build Variant -> x86Debug
  • https://stackoverflow.com/questions/41775988/what-is-the-reason-for-the-error-device-supports-x86-but-apk-only-supports-arm
• Add to path: /Users/asdf/Library/Android/sdk/platform-tools
• Sdk version setting:
  • Compile Sdk Version = Target Sdk Version <= API Level 26
  • Min Sdk Version <= API Level 15, etc.
• Print to LogCat
  • From Java: android.util.Log.e("tag", "message");
  • From cpp:
    • #include <android/log.h>
    • __android_log_print(ANDROID_LOG_ERROR, "NativeCode", "%s(%d)", __FILE__, __LINE__);
    • __android_log_print(ANDROID_LOG_ERROR, "NativeCode", "%s(%d)", __PRETTY_FUNC__, __LINE__);
  • http://d.hatena.ne.jp/itog/20091216/1260924845
  • How to access emulator's local file:
    • adb shell
    • run-as com.example.who.awhat
    • ls etc.
    • md5 files/some.txt
    • CANNOT do adb pull ...
  • https://akira-watson.com/android/adb_run-as.html
  • Good to know:
  • https://qiita.com/SaitoAtsushi/items/555b3851017b120c85b7
    • Add to CMakeLists.txt:
    • set (CMAKE_C_FLAGS "-fsigned-char ${CMAKE_C_FLAGS}")
    • To check where/which source an include file.hpp is included, add -H option:
      • set (CMAKE_CXX_FLAGS "-H -std=c++11 ${CMAKE_CXX_FLAGS}")
      • The cpp source which include the hpp file is shown in Gradle Console.
  • std::to_string NOT exist:
  • https://stackoverflow.com/questions/41603049/error-no-member-named-to-string-in-namespace-std-did-you-mean-tostring/
  • https://developer.android.com/ndk/guides/cpp-support.html#hr
    • app/build.gradle:
      • externalNativeBuild {
      • cmake {
      • ...
      • // Use the following syntax when passing arguments to variables:
      • // arguments "-DVAR_NAME=VALUE"
      • // ------------------- ANSWER -------------------
      • arguments "-DANDROID_STL=c++_shared"
      • }
      • }
    • or c++_static
  • Redirect stdout to logcat: https://codelab.wordpress.com/2014/11/03/how-to-use-standard-output-streams-for-logging-in-android-apps/

Generate signed APK

• https://qiita.com/mfks17/items/c38d3713cb5b2c5536ff
  • idntts sign, key0 alias