为Android构建Mailcore2

我按照以下步骤重新编译库。就我而言：

> export ANDROID_SDK=$HOME/Library/Android/sdk
> export ANDROID_NDK=$ANDROID_SDK/ndk-bundle
> ./build.sh

并在编译过程中得到一些错误，如：

[arm64-v8a] Compile++      : MailCore <= MCIMAPAsyncSession.cpp
In file included from /Users/nikolay/Documents/Mailcore/mailcore2/build-android/jni/../include/MailCore/MCObject.h:11:0,
                 from /Users/nikolay/Documents/Mailcore/mailcore2/build-android/jni/../include/MailCore/MCAutoreleasePool.h:5,
                 from /Users/nikolay/Documents/Mailcore/mailcore2/build-android/jni/../include/MailCore/MCBaseTypes.h:5,
                 from /Users/nikolay/Documents/Mailcore/mailcore2/build-android/jni/../../src/async/imap/MCIMAPAsyncSession.h:13,
                 from /Users/nikolay/Documents/Mailcore/mailcore2/build-android/jni/../../src/async/imap/MCIMAPAsyncSession.cpp:9:
/Users/nikolay/Documents/Mailcore/mailcore2/build-android/jni/../../src/async/imap/MCIMAPAsyncSession.cpp: In member function 'virtual void mailcore::IMAPAsyncSession::automaticConfigurationDone(mailcore::IMAPSession*)':
/Users/nikolay/Documents/Mailcore/mailcore2/build-android/jni/../../src/async/imap/MCIMAPAsyncSession.cpp:874:87: warning: 'virtual mailcore::String* mailcore::IMAPSession::gmailUserDisplayName()' is deprecated (declared at /Users/nikolay/Documents/Mailcore/mailcore2/build-android/jni/../../src/core/imap/MCIMAPSession.h:196) [-Wdeprecated-declarations]
     MC_SAFE_REPLACE_COPY(String, mGmailUserDisplayName, session->gmailUserDisplayName());
                                                                                       ^
/Users/nikolay/Documents/Mailcore/mailcore2/build-android/jni/../include/MailCore/MCUtils.h:8:27: note: in definition of macro 'MC_SAFE_COPY'
 #define MC_SAFE_COPY(o) ((o) != NULL ? (o)->copy() : NULL)
                           ^
/Users/nikolay/Documents/Mailcore/mailcore2/build-android/jni/../../src/async/imap/MCIMAPAsyncSession.cpp:874:5: note: in expansion of macro 'MC_SAFE_REPLACE_COPY'
     MC_SAFE_REPLACE_COPY(String, mGmailUserDisplayName, session->gmailUserDisplayName());
     ^
/Users/nikolay/Documents/Mailcore/mailcore2/build-android/jni/../../src/async/imap/MCIMAPAsyncSession.cpp:874:87: warning: 'virtual mailcore::String* mailcore::IMAPSession::gmailUserDisplayName()' is deprecated (declared at /Users/nikolay/Documents/Mailcore/mailcore2/build-android/jni/../../src/core/imap/MCIMAPSession.h:196) [-Wdeprecated-declarations]
     MC_SAFE_REPLACE_COPY(String, mGmailUserDisplayName, session->gmailUserDisplayName());
                                                                                       ^
/Users/nikolay/Documents/Mailcore/mailcore2/build-android/jni/../include/MailCore/MCUtils.h:8:41: note: in definition of macro 'MC_SAFE_COPY'
 #define MC_SAFE_COPY(o) ((o) != NULL ? (o)->copy() : NULL)
                                         ^
/Users/nikolay/Documents/Mailcore/mailcore2/build-android/jni/../../src/async/imap/MCIMAPAsyncSession.cpp:874:5: note: in expansion of macro 'MC_SAFE_REPLACE_COPY'
     MC_SAFE_REPLACE_COPY(String, mGmailUserDisplayName, session->gmailUserDisplayName());
     ^

... compiling goes ok...
... and again some errors...

---

如何重新编译库？最后，我想修复一个问题，但它甚至没有一个干净的构建

它正在寻找Android平台16和21，但找不到它们，这就是为什么它会显示错误消息：

error: package android.os does not exist

它们通常安装在文件夹

$ANDROID\u SDK/platforms

（在

buildandroid/build.sh

顶部附近添加此项，以查看其功能：

set -v
set -x

这将显示它正在运行的命令以及shell变量的内容。）

如果打开Mailcore2中的文件

buildandroid/build.sh

，您将看到如下行：

# Start building.
ANDROID_PLATFORM=android-16
archs="armeabi armeabi-v7a x86"

将

android-16

替换为您已安装的任何版本，或者更好，安装

android-16

，因为它期待这样。 另外，

armeabi

平台支持已经从最新的Android NDK中删除，它给了我关于它的错误信息。因此，删除

armeabi

，只保留

armeabi-v7a

和

x86

下面还有：

ANDROID_PLATFORM=android-21
archs="arm64-v8a"

以及：

因此安装

android-16

和

android-21

最容易解决此问题。

我也得到了错误：

Android NDK: APP_PLATFORM not set. Defaulting to minimum supported version android-16. 

*** Android NDK: Invalid NDK_TOOLCHAIN_VERSION value: 4.9. GCC is no longer supported. See https://android.googlesource.com/platform/ndk/+/master/docs/ClangMigration.md.    .  Stop.

MailCore2/build-android/jni/../../src/java/TypesUtils.cpp:84:32: error: member access into incomplete type 'const std::type_info'
MCLog("info name: %s", info->name());
                           ^

找到这条线：

$ANDROID_NDK/ndk-build TARGET_PLATFORM=$ANDROID_PLATFORM TARGET_ARCH_ABI=$TARGET_ARCH_ABI \

然后向其中添加

APP_PLATFORM

，就像这样，修复了该错误：

$ANDROID_NDK/ndk-build TARGET_PLATFORM=$ANDROID_PLATFORM APP_PLATFORM=$ANDROID_PLATFORM TARGET_ARCH_ABI=$TARGET_ARCH_ABI \

我也得到了错误：

Android NDK: APP_PLATFORM not set. Defaulting to minimum supported version android-16. 

*** Android NDK: Invalid NDK_TOOLCHAIN_VERSION value: 4.9. GCC is no longer supported. See https://android.googlesource.com/platform/ndk/+/master/docs/ClangMigration.md.    .  Stop.

MailCore2/build-android/jni/../../src/java/TypesUtils.cpp:84:32: error: member access into incomplete type 'const std::type_info'
MCLog("info name: %s", info->name());
                           ^

显然，GCC不再受支持。我安装了clang，之后它继续编译项目，但由于另一个错误而停止

此外，我必须删除包含以下内容的行：

NDK_TOOLCHAIN_VERSION=4.9 \

如上所述

我收到了错误消息：

Android NDK: APP_PLATFORM not set. Defaulting to minimum supported version android-16. 

*** Android NDK: Invalid NDK_TOOLCHAIN_VERSION value: 4.9. GCC is no longer supported. See https://android.googlesource.com/platform/ndk/+/master/docs/ClangMigration.md.    .  Stop.

MailCore2/build-android/jni/../../src/java/TypesUtils.cpp:84:32: error: member access into incomplete type 'const std::type_info'
MCLog("info name: %s", info->name());
                           ^

这显然与：

GCC似乎只是隐式地声明了

std:：type\u info

。在使用Clang和libstdc++进行典型的Hello World时，您通常第一次遇到这个问题Xeo 2013年2月26日20:42

---

我还没能解决这个问题，但我会在有机会的时候更新这篇文章。

很好的研究！：）@NikolayKulachenko谢谢，我会在有空的时候尝试完成它。在哪里添加此项：>导出ANDROID\u SDK=$HOME/Library/ANDROID/SDK>导出ANDROID\u NDK=$ANDROID\u SDK/NDK bundle>/build.sh我无法进行此设置。请帮帮我