问题描述
在试图寻找一个答案， Android的碧玉报告我发现还有两个问题需要为此回答，我被问了问的一个问题，而不是一个答案）：
While trying to find an answer to Android Jasper Reporting I found out that there are two other questions to be answered therefor, which I been asked to ask as a question, not as an answer ;):
我的问题是现在：有没有编译器直接在设备上使用和如何执行这种不生根的设备。如果有人能够给我一个提示我真的AP preciate吧...
My questions are now: "Is there any compiler to use directly on the device" AND "how to execute such without rooting the device.If anybody could give me a hint I would really appreciate it...
我看了一点点时间向前这种方法，并发现应用程序，这使得它可以直接其中的根源并非是在Android设备上创建的APK：
I looked a little time forward on this approach, and found apps which makes it possible to create APKs directly on an Android device which is NOT rooted:
- TerminalIDE - 的
- JavaIDEdroid - HTTP：//$c$c.google.com / P / Java的IDE-机器人/
- 在AIDE - https：//开头的发挥。 google.com/store/apps/details?id=com.aide.ui&hl=en
- TerminalIDE - https://play.google.com/store/apps/details?id=com.spartacusrex.spartacuside&hl=de
- JavaIDEdroid - http://code.google.com/p/java-ide-droid/
- AIDE - https://play.google.com/store/apps/details?id=com.aide.ui&hl=en
看起来他们正在使用的编译器日食和移植DEX转换器。现在，我试图找出如何做。
Looks like they're using the compiler from eclipse and a ported dex converter. Now I'm trying to figure out how to do the same.
肯定：获得源$ C $ c和一下。但我有好奇的问题，同时获得对服务器的连接，并试图解决它，我跟着认罪问这个问题在这里。希望既能帮助别人，并同时得到一个答案呢;）
Sure: get the source code and look into it. But while I'm having curious problems to get a connection to the servers and trying to solve it, I follow the plea to ask this question here. Hoping both to help others with it and also getting an answer for myself ;)
我从我的靛蓝的插件目录中的org.eclipse.jdt.core_3.7.3.v20120119-1537.jar和尝试以下code：
I took the org.eclipse.jdt.core_3.7.3.v20120119-1537.jar from the plugin directory of my indigo and tried following code:
org.eclipse.jdt.internal.compiler.batch.Main ecjMain = new org.eclipse.jdt.internal.compiler.batch.Main(new PrintWriter(System.out), new PrintWriter(System.err), false/*noSystemExit*/, null, progress);
System.err.println("compiling...");
ecjMain.compile(new String[] {"-classpath", "/system/framework", storage.getAbsolutePath()+"/Test.java"});
ecjMain.compile(new String[] {storage.getAbsolutePath()+"/Test.java"});
System.err.println("compile succeeded!!!");
有时候异常被抛出的java.lang.Object不能被发现和othertimes它坚持做什么而升温我的处理器与100％的使用率......
Sometimes the Exception was thrown that java.lang.Object could not be found and othertimes it stuck doing nothing while heating up my processor with 100% usage ... ...
在这个时候，我无法弄清楚发生了什么以及为什么。而在事业，我还有其他工作要做，这部分必须等待一点点。
At this time i could not figure out what is happening and why. And in cause that i have other work to do this part has to wait a little.
推荐答案
取灵感来自的并意识到我是愚蠢的（一段时间我试图使用编译器与设备上的dexified框架类 - 这naturtally无法工作）。
之后我成功编译我的Test.java与SD卡的ADT的Android-JAR的副本，我只是加载类与DexClassLoader。
同时通报myselft有关如何做到这一点，我发现这个好文章的这启发了我，至少写这片code：
I succeeded after taking inspiration from source of JavaIDEdroid and realizing that I'm dumb (for a time I tried to uses the compiler with the dexified framework classes on the device - which naturtally could not work).
After i succeeded compiling my Test.java with a copy of ADTs android-jar on sdcard I just had to load the classes with the DexClassLoader.
While informing myselft about how to do that I found this nice article Custom Class Loading in Dalvik which inspired me at least to write this piece of code:
File storage = getDir("all41", Context.MODE_PRIVATE);
System.err.println("copying the android.jar from asssets to the internal storage to make it available to the compiler");
BufferedInputStream bis = null;
OutputStream dexWriter = null;
int BUF_SIZE = 8 * 1024;
try {
bis = new BufferedInputStream(getAssets().open("android.jar"));
dexWriter = new BufferedOutputStream(
new FileOutputStream(storage.getAbsolutePath() + "/android.jar"));
byte[] buf = new byte[BUF_SIZE];
int len;
while((len = bis.read(buf, 0, BUF_SIZE)) > 0) {
dexWriter.write(buf, 0, len);
}
dexWriter.close();
bis.close();
} catch (Exception e) {
System.err.println("Error while copying from assets: " + e.getMessage());
e.printStackTrace();
}
System.err.println("instantiating the compiler and compiling the java file");
org.eclipse.jdt.internal.compiler.batch.Main ecjMain = new org.eclipse.jdt.internal.compiler.batch.Main(new PrintWriter(System.out), new PrintWriter(System.err), false/*noSystemExit*/, null);
ecjMain.compile(new String[] {"-classpath", storage.getAbsolutePath()+"/android.jar", Environment.getExternalStorageDirectory().getAbsolutePath() + "/Test.java"});
System.err.println("calling DEX and dexifying the test class");
com.android.dx.command.Main.main(new String[] {"--dex", "--output=" + storage.getAbsolutePath() + "/Test.zip", Environment.getExternalStorageDirectory().getAbsolutePath() + "/./Test.class"});
System.err.println("instantiating DexClassLoader, loading class and invoking toString()");
DexClassLoader cl = new DexClassLoader(storage.getAbsolutePath() + "/Test.zip", storage.getAbsolutePath(), null, getClassLoader());
try {
Class libProviderClazz = cl.loadClass("Test");
Object instance = libProviderClazz.newInstance();
System.err.println(instance.toString());
} catch (Exception e) {
System.err.println("Error while instanciating object: " + e.getMessage());
e.printStackTrace();
}
该Test.java只包含一个方法：
The Test.java only contains one method:
public String toString() {
return "Hallo Welt!";
}
要让它运行，你需要的罐子JDT编译器，xxxjar和dx.jar（在Eclipse的插件目录中找到）（目录平台工具发现/ Android SDK中的LIB）
To get it running you need the jars jdt-compiler-x.x.x.jar (found in plugins directory of eclipse) and dx.jar (found in directory platform-tools/lib of Android SDK)
不是真的很难;）
现在我将找出的JasperReports源改变什么让它在我们敬爱的Android设备的工作：D
Not really hard ;)
And now I will find out what to change in source of JasperReports to get it work on our beloved Android devices :D
这篇关于如何实现Java编译器和DEX转换器转换成一个Android应用程序？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！