最近在研究安卓的OTA rom，找到一个开源的项目https://github.com/MatthewBooth/OTAUpdates 其中用到了bypass。
bypass：Skip the HTML, Bypass takes markdown and renders it directly on Android and iOS.
使用Android Studio 1.3.2导入项目编译时出错：Error:(3, 31) 错误: 程序包in.uncod.android.bypass不存在。
这个包在src_bypass目录下，AS并没有导入这个目录。bypass需要用到NDK来编译。项目的Building说明是针对linux下Eclipse的，我用的是Window下AS，刚学Android，不知道怎么配置。
偷懒找到一个使用的AS的bypass项目：https://github.com/actorapp/bypass 导入项目后，出现以下问题：
1.未设置NDK的路径
Error:Execution failed for task ':library:ndkBuild'. > A problem occurred starting process 'command 'null/ndk-build''
配置NDK的的安装路径即可。
1）设置环境变量：新增ANDROID_NDK_HOME键值为Android NDK安装目录，在PATH末尾增加;%ANDROID_NDK_HOME%。
或者2）在AS的project structure设置，如下图：
2. 调用的ndk-build命令不对
Error:Execution failed for task ':library:ndkBuild'.> A problem occurred starting process 'command 'D:\androidDev\android-ndk-r10e/ndk-build''
在stackoverflow上找到原因，build.gradle文件中
taskndkBuild(type: Exec,description:'Compile JNI source via NDK') {
defndkDir =project.plugins.findPlugin('com.android.library').sdkHandler.ndkFolder
workingDir"$projectDir/src/main/jni"
commandLine"$ndkDir/ndk-build"
}
commandLine"$ndkDir/ndk-build"这一行windows下应该用ndk-build.cmd
3. 找不到boost库文件
项目Readme中有说明
Manual Build
Make sureBYPASS_INCLUDE_PATH to its parent directory.
设置环境变量：新增BYPASS_INCLUDE_PATH键值为boost的安装目录，在PATH末尾增加;%BYPASS_INCLUDE_PATH%。
折腾好久，终于编译通过！
Log开关的使用
代码中有一段Benchmark耗时的打印输出
public class BenchmarkActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
TextView text = (TextView) findViewById(R.id.demoText);
TimingLogger timings = new TimingLogger("Bypass", "onCreate");
String readme = loadFile();
timings.addSplit("read raw");
Bypass bypass = new Bypass(BenchmarkActivity.this);
timings.addSplit("instantiated Bypass");
CharSequence string = bypass.markdownToSpannable(readme);
timings.addSplit("convert to spannable");
timings.dumpToLog();
text.setText(string);
//Allows link clicking
text.setMovementMethod(LinkMovementMethod.getInstance());
}
......
}
logcat中却看不到。调试跟踪发现这个打印是通过Log.isLoggable来控制开关。在adb shell中设置属性setprop log.tag.Bypass VERBOSE打开打印输出或者写在local.properties中，就可以看到打印输出了。
09-07 09:24:12.111 25845-25845/in.uncod.android.bypass.test D/Bypass﹕ onCreate: begin
09-07 09:24:12.111 25845-25845/in.uncod.android.bypass.test D/Bypass﹕ onCreate: 1 ms, read raw
09-07 09:24:12.111 25845-25845/in.uncod.android.bypass.test D/Bypass﹕ onCreate: 29 ms, instantiated Bypass
09-07 09:24:12.111 25845-25845/in.uncod.android.bypass.test D/Bypass﹕ onCreate: 11 ms, convert to spannable
09-07 09:24:12.111 25845-25845/in.uncod.android.bypass.test D/Bypass﹕ onCreate: end, 41 ms
