1 編譯Android7.0+更改Java heap Size

Android7.0（也就是Android N）上預設使用JACK編譯器，當記憶體較小的機器編譯時可能會出現：

Out of memory error (version 1.2-rc4 ‘Carnac’ (298900 f95d7bdecfceb327f9d201a1348397ed8a843843 by [email protected])).
GC overhead limit exceeded.
Try increasing heap size with java option ‘-Xmx’.

此時需要更改Java heap Size，有2種方式任選：

方法1（不需要make clean，export後即可繼續make xxxx）：

export JACK_SERVER_VM_ARGUMENTS=”-Dfile.encoding=UTF-8 -XX:+TieredCompilation -Xmx4096m”
out/host/linux-x86/bin/jack-admin kill-server
out/host/linux-x86/bin/jack-admin start-server

方法2：

修改原始碼目錄下prebuilts/sdk/tools/jack-admin檔案的JACK_SERVER_VM_ARGUMENTS變數,
新增-Xmx4096M(這個根據你自己的記憶體情況),然後make clean,make -j48重新編譯。

2 /usr/lib/x86_64-linux-gnu/libQt5Core.so.5: version `Qt_5.7’ not found (required by emulator64-x86)

Leave libQt5Core.so.5 in /home/wanyu/work/aosp/prebuilts/android-emulator/linux-x86_64/lib64/qt/. Qt does not like to be moved around, it makes it lose where the plugins are stored. In your case it might end up trying to load Qt 5.5 plugins.

Set LD_LIBRARY_PATH to /home/wanyu/work/aosp/prebuilts/android-emulator/linux-x86_64/lib64/qt/.

3.解決命令啟動Android模擬器出現lib64OpenglRender.so: cannot open shared object file問題

export LD_LIBRARY_PATH=~/Android/sdk/tools/lib64:$LD_LIBRARY_PATH

4模擬器跑步起來

4.1

4.2

4.3

sourcebuild/envsetup.sh lunch aosp_x86-eng
$ make -j4

4.4

emulator