dex - What is Android Pre-Dexing and how to does it increase performance? -


i see ant script of android has message "pre-dexing". dex , pre-dex uses same options, except in 1 case 1 jar @ time, in other case multiple jars @ time.

what real need? pre-dex mandatory?

e.g

the ' characters around executable , arguments not part of command.       [dex] pre-dexing f:\users\tejasoft\work\fnd\cmn\tools\social\sz\demo\libs\pinit-sdk-1.0.jar -> pinit-sdk-1.0-e3bebafa2727504605edf3d8d85b5d46.jar        [dx] current os windows 7        [dx] executing 'd:\apps\java\embd\cmn\android\oems\google\adt\4.x\4.3.x\4.3\sdk\build-tools\18.1.0\dx.bat' arguments:        [dx] '--dex'        [dx] '--output'        [dx] 'f:\users\tejasoft\work\fnd\cmn\tools\social\sz\demo\bin\dexedlibs\pinit-sdk-1.0-e3bebafa2727504605edf3d8d85b5d46.jar'        [dx] 'f:\users\tejasoft\work\fnd\cmn\tools\social\sz\demo\libs\pinit-sdk-1.0.jar'        [dx]         [dx] ' characters around executable , arguments        [dx] not part of command. execute:java13commandlauncher: executing 'd:\apps\java\embd\cmn\android\oems\google\adt\4.x\4.3.x\4.3\sdk\build-tools\18.1.0\dx.bat' arguments: '--dex' '--output' 'f:\users\tejasoft\work\fnd\cmn\tools\social\sz\demo\bin\dexedlibs\pinit-sdk-1.0-e3bebafa2727504605edf3d8d85b5d46.jar' 'f:\users\tejasoft\work\fnd\cmn\tools\social\sz\demo\libs\pinit-sdk-1.0.jar'  ' characters around executable , arguments not part of command.       [dex] converting compiled files , external libraries f:\users\tejasoft\work\fnd\cmn\tools\social\sz\demo\bin\classes.dex...        [dx] current os windows 7        [dx] executing 'd:\apps\java\embd\cmn\android\oems\google\adt\4.x\4.3.x\4.3\sdk\build-tools\18.1.0\dx.bat' arguments:        [dx] '--dex'        [dx] '--output'        [dx] 'f:\users\tejasoft\work\fnd\cmn\tools\social\sz\demo\bin\classes.dex'        [dx] 'f:\users\tejasoft\work\fnd\cmn\tools\social\sz\demo\bin\classes'        [dx] 'f:\users\tejasoft\work\fnd\cmn\tools\social\sz\demo\bin\dexedlibs\classes-144740ee5cf8b90b747300d19fb8201e.jar'        [dx] 'f:\users\tejasoft\work\fnd\cmn\tools\social\sz\demo\bin\dexedlibs\classes-1593da1bb60c5ec741aca494963e04a3.jar'        [dx] 'f:\users\tejasoft\work\fnd\cmn\tools\social\sz\demo\bin\dexedlibs\classes-37bb5269e4fbd6dda9900fea95c0c29b.jar'

it's useful remember in case working in java, not same thing dalvik runtime. java, oracle, uses different virtual machine, while dalvik fine-tuned mobile devices.

the dex processes take java compiled jar files , converts them dalvik executable files (.dex) files run on android. oracle jvm uses different bytecode dalvik runtime, making step necessity.

there process libraries might have included in project, compiled standard java compiler, , process actual project.

it's done in 2 steps final process, application, requires access dexed library files avoid having references code change while process busy.

you can find out more @ http://source.android.com/devices/tech/dalvik/index.html - see dalvik scheduled replacement called art.


Comments

Post a Comment

Popular posts from this blog

c++ - CryptStringToBinary API behavior -

i seeing strange behavior cryptstringtobinary cryptography api. please see below code (config: x64 debug): #include "stdafx.h" #include <windows.h> #include <strsafe.h> #include <iostream> #include <exception> void main() { dword dwskip; dword dwflags; dword dwdatalen; //lpcwstr pszinput = l"jaaaaaecaaadzgaaakqaagdnnl1l56bwgfjdgr3rpxtqqqn6daw3usv2emkjym4t"; //this works fine lpcwstr pszinput = l"mytest"; //doesnt work, api returns false,error code 0x0000000d // determine size of byte array , allocate memory. if(! cryptstringtobinary( pszinput, _tcslen( pszinput ) + 1, crypt_string_base64, null, &dwdatalen, &dwskip, &dwflags ) ) { dword dw = getlasterror(); //0x0000000d: data invalid throw std::exception( "error computing byte length." ); } byte *pbytebyte = null; try { ...
Read more

java.util.scanner - How to read and add only numbers to array from a text file -

i'm learning java , have question regarding reading file want read numbers file contains strings well. here example of file: 66.56 "3 java 3-43 5-42 2.1 1 and here coding: public class test { public static void main (string [] args){ if (0 < args.length) { file x = new file(args[0]); try{ scanner in = new scanner( new fileinputstream(x)); arraylist<double> test = new arraylist<>(); while(in.hasnext()){ if(in.hasnextdouble()){ double f=in.nextdouble(); test.add(f);} else {in.next();} } catch(ioexception e) { system.err.println("exception during reading: " + e); } } my problem add 66.56,2.1 , 1 doesn't add 3 after "3 or ignores 3-43 , 5-42 can tell me how skip strings , add doubles here? thanks all said 3 ie; "3, 3-43 , 4-42 strings either u read string , split , check number @ " , - or put in space between characters , integers. jvm after compilation tre...
Read more

iphone - Three second countdown in cocos2d -

i trying have 3 second countdown display when level beat in game. did: -(void) gamesegmentbeat { [self pauseschedulerandactions]; // overlay game opaque background ccsprite *opaquebg = [ccsprite spritewithfile:@"background1.png"]; opaquebg.position = screencenter; [self addchild:opaquebg z:10000]; // these 3 labels 3 seconds cclabelttf *three = [cclabelttf labelwithstring:@"3" fontname:@"helvetica" fontsize:100]; three.position = ccp(screencenter.x, screencenter.y); cclabelttf *two = [cclabelttf labelwithstring:@"2" fontname:@"helvetica" fontsize:100]; two.position = ccp(screencenter.x, screencenter.y); cclabelttf *one = [cclabelttf labelwithstring:@"1" fontname:@"helvetica" fontsize:100]; one.position = ccp(screencenter.x, screencenter.y); // secondspast specified in update method secondspast = 0; if (secondspast == 1) { [self addchild:thr...
Read more