问题一：(原因是新版本jdk)
Ensure Jack server is installed and started
FAILED: /bin/bash -c "(prebuilts/sdk/tools/jack-admin install-server prebuilts/sdk/tools/jack-launcher.jar prebuilts/sdk/tools/jack-server-4.8.ALPHA.jar 2>&1 || (exit 0) ) && (JACK_SERVER_VM_ARGUMENTS=\"-Dfile.encoding=UTF-8 -XX:+TieredCompilation\" prebuilts/sdk/tools/jack-admin start-server 2>&1 || exit 0 ) && (prebuilts/sdk/tools/jack-admin update server prebuilts/sdk/tools/jack-server-4.8.ALPHA.jar 4.8.ALPHA 2>&1 || exit 0 ) && (prebuilts/sdk/tools/jack-admin update jack prebuilts/sdk/tools/jacks/jack-2.28.RELEASE.jar 2.28.RELEASE || exit 47; prebuilts/sdk/tools/jack-admin update jack prebuilts/sdk/tools/jacks/jack-3.36.CANDIDATE.jar 3.36.CANDIDATE || exit 47; prebuilts/sdk/tools/jack-admin update jack prebuilts/sdk/tools/jacks/jack-4.7.BETA.jar 4.7.BETA || exit 47 )"
Jack server already installed
Jack server failed to (re)start, try 'jack-diagnose' or see Jack server log
SSL error when connecting to the Jack server. Try 'jack-diagnose'
SSL error when connecting to the Jack server. Try 'jack-diagnose'
解决办法：
1.root权限打开java.security文件；
sudo gedit /usr/lib/jvm/java-8-openjdk-amd64/jre/lib/security/java.security
2.ctrl+f搜索jdk.tls.disabledAlgorithms找到并删除下图中的TLSv1,TLSv1.1；
image.png
3..bashch文件内添加环境变量
// 到根目录下执行
cd ~
sudo gedit .bashrc
export LC_ALL=C
source .bashrc//立即生效
保存并重启下系统；
（如果修改后不再报jack错了，但是又报其他的模块错误，make clean一下，在进行make）
问题二：
385b20ac77cf6ffa6e4e3deb3076128.png
//解决方案：（依次在Terminal中执行下面3个命令）
export JACK_SERVER_VM_ARGUMENTS="-Dfile.encoding=UTF-8 -XX:+TieredCompilation -Xmx4g"
./prebuilts/sdk/tools/jack-admin kill-server
./prebuilts/sdk/tools/jack-admin start-server
问题三：
Jack server already installed in "/home/qiuwenxiong/.jack-server"
Launching Jack server java -XX:MaxJavaStackTraceDepth=-1 -Djava.io.tmpdir=/tmp -Dfile.encoding=UTF-8 -XX:+TieredCompilation -cp /home/qiuwenxiong/.jack-server/launcher.jar com.android.jack.launcher.ServerLauncher
Jack server failed to (re)start, try 'jack-diagnose' or see Jack server log
No Jack server running. Try 'jack-admin start-server'
No Jack server running. Try 'jack-admin start-server'
[ 95% 35694/37499] host C++: libaapt2_32 <= frameworks/base/tools/aapt2/SdkConstants.cpp
ninja: build stopped: subcommand failed.
build/core/ninja.mk:148: recipe for target 'ninja_wrapper' failed
make: *** [ninja_wrapper] Error 1
#### make failed to build some targets (09:05 (mm:ss)) ####
解决方案：
1.修改jack-settings
sudo gedit ~/.jack-settings
//修改下面SERVER_PORT_SERVICE，SERVER_PORT_ADMIN端口号改成没人用的端口
# Server settings
SERVER_HOST=127.0.0.1
SERVER_PORT_SERVICE=9088
SERVER_PORT_ADMIN=9089
# Internal, do not touch
SETTING_VERSION=4
2.修改jack-server/config.properties
sudo gedit ~/.jack-server/config.properties
//①：将jack.server.service.port 的端口修改成和 SERVER_PORT_SERVICE 一致
//②：将jack.server.admin.port 的端口修改成和 SERVER_PORT_ADMIN 一致
#Wed Apr 15 08:55:26 CST 2020
jack.server.max-jars-size=104857600
jack.server.max-service=4
jack.server.service.port=9088
jack.server.max-service.by-mem=1\=2147483648\:2\=3221225472\:3\=4294967296
jack.server.admin.port=9089
jack.server.config.version=2
jack.server.time-out=7200
3.修改.jack
sudo gedit ~/.jack
//复制进去
SERVER_PORT_SERVICE=9088
SERVER_PORT_ADMIN=9089
//查看端口是否一致：
cat ~/.jack-server/config.properties|grep -i port && cat ~/.jack|grep -i port|grep -v LOG &&cat ~/.jack-settings|grep -i port
//显示下图，需要三个端口一致
1674269507687.jpg
问题四：
image.png
解决方案：
1.进入/ack-admin，cd到源码目录下执行
sudo gedit ~/prebuilts/sdk/tools/jack-admin
2.修改文件
将 JACK_SERVER_COMMAND="java -XX:MaxJavaStackTraceDepth=-1 -Djava.io.tmpdir=$TMPDIR $JACK_SERVER_VM_ARGUMENTS -cp $LAUNCHER_JAR $LAUNCHER_NAME"
修改为 JACK_SERVER_COMMAND="java -XX:MaxJavaStackTraceDepth=-1 -Djava.io.tmpdir=$TMPDIR $JACK_SERVER_VM_ARGUMENTS -Xmx4096m -cp $LAUNCHER_JAR $LAUNCHER_NAME"
3.停止jack服务
out/host/linux-x86/bin/jack-admin kill-server
4.开启jack服务
out/host/linux-x86/bin/jack-admin start-server
问题五：
emulator: ERROR: x86_64 emulation currently requires hardware acceleration!
CPU acceleration status: KVM requires a CPU that supports vmx or svm
解决方案：（虚拟机设置）
image.png
问题六：
Your emulator is out of date, please update by launching Android Studio:
//解决方案：启动androidStudio根据提示按下列步骤操作
- Start Android Studio
- Select menu "Tools > Android > SDK Manager"
- Click "SDK Tools" tab
- Check "Android Emulator" checkbox
- Click "OK"
问题七：
Could not automatically detect an ADB binary. Some emulator functionality winot work until a custom path to ADB is added in the extended settings page.
解决方案：
1.点击模拟器右侧功能栏的最下边三个点
2.左边菜单栏点击settings
3.将Use detected 开关关掉
问题八：
模拟器一直卡在android动画，进不去桌面，可能因为缓存问题，清空缓存重新加载模拟器
首次启动遇到模拟器一直在启动动画处，进不去桌面,可能因为之前的环境缓存问题执行下面的代码重新加载模拟器
emulator -wipe-data
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