Denis PALLEZ

Associate Professor in Computer Science

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tuto_ecj_android

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tuto_ecj_android [2014/03/03 14:16] – [5. Print configuration data] Denis Palleztuto_ecj_android [2014/03/03 15:05] – Denis Pallez
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-====== TutorialHow to install ECJ library on Android environment ? ====== +====== How to install ECJ library on Android environment ? ======
- +
-  - [[#install|Installation of Eclispe and Android SDK]] +
-  - [[#createANewProject|Create a new Android Project]] +
-  - [[#addEcj|Add ECJ library in your project]] +
-  - [[#collectInfo|Collect configuration data]] +
-  - [[#printInfo|Print configuration data]] +
-  - [[#writeInfo|Write in a File with Android]] +
-  - [[#useNewConfigFile|Use a file in an another one]] +
 ===== 1. Installation of Eclispe and Android SDK ===== ===== 1. Installation of Eclispe and Android SDK =====
  
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 Now, to get the all data in "config_ecj.params", we have to create an InputStream.\\ Add these lines in your code :  Now, to get the all data in "config_ecj.params", we have to create an InputStream.\\ Add these lines in your code : 
-<code>+<code java>
 InputStream configStream = null; InputStream configStream = null;
 try { try {
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 If your configuration file is named "config_ecj.params", located in the assets package and "this" correspond to the current context of your application, this code shouldn't cause any problem. If your configuration file is named "config_ecj.params", located in the assets package and "this" correspond to the current context of your application, this code shouldn't cause any problem.
 It only remains to transfer the InputStream "configStream" at the ParameterDatabase who's in charge of initializing ECJ. Here is how to initialize the ParameterDatabase : It only remains to transfer the InputStream "configStream" at the ParameterDatabase who's in charge of initializing ECJ. Here is how to initialize the ParameterDatabase :
-<code>+<code java>
 ParameterDatabase paramDB = null; ParameterDatabase paramDB = null;
 try { try {
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 Now, you could run your evolutionary algorithm with the code below (more details are given in the ECJ manual, page 44) Now, you could run your evolutionary algorithm with the code below (more details are given in the ECJ manual, page 44)
-<code>+<code java>
 EvolutionState evaluatedState = Evolve.initialize(paramDB, 0); EvolutionState evaluatedState = Evolve.initialize(paramDB, 0);
 evaluatedState.startFresh(); evaluatedState.startFresh();
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 ===== 6. Write in a File with Android ===== ===== 6. Write in a File with Android =====
  
-However, ECJ may need a real File to run, and not an InputStream. For example, to initialize a population.\\ \\ In this part we'll see how to write a file.\\ As in the previous example you'll need a package named "assets".\\ Create a file in your workspace named "config_ecj_in.in" (for an initialization file, by example).\\ After, you'll need the context of you application :\\ Context mContext = this; Then, you have to load your file on your smartphone : File file = mContext.getFileStreamPath("config_ecj_in.in"); Finaly, you can write into your file thanks to a FileWrite and a BufferedWriter : FileWriter fileWriter = null;\\ try {\\ fileWriter = new FileWriter(file);\\  } catch (IOException e1) {\\ e1.printStackTrace();\\  }\\ BufferedWriter output = new BufferedWriter(fileWriter);\\ try {\\ output.write("Hello World ! ");\\  }\\ output.flush();\\ catch (Exception e) {\\ Toast.makeText(mContext, "Settings not saved", Toast.LENGTH_SHORT).show();\\  }\\ finally {\\ try {\\  output.close();\\  fileWriter.close();\\  } catch (IOException e) {\\  Toast.makeText(mContext, "Settings not saved", Toast.LENGTH_SHORT).show();\\  }\\  }\\  As you can understand, this code write the text "Hello World" into the file "config_ecj_in.in".\\ +However, ECJ may need a real File to run, and not an InputStream. For example, to initialize a population. 
 + 
 +In this part we'll see how to write a file. 
 +As in the previous example you'll need a package named "assets".\\ Create a file in your workspace named "config_ecj_in.in" (for an initialization file, by example). 
 +After, you'll need the context of you application : <code java>Context mContext = this; </code> 
 +Then, you have to load your file on your smartphone : <code java>File file = mContext.getFileStreamPath("config_ecj_in.in"); </code> 
 +Finaly, you can write into your file thanks to a FileWrite and a BufferedWriter : <code java> 
 +FileWriter fileWriter = null; 
 +try { 
 +  fileWriter = new FileWriter(file); 
 +} 
 +catch (IOException e1) { 
 +  e1.printStackTrace(); 
 +} 
 +BufferedWriter output = new BufferedWriter(fileWriter); 
 +try { 
 +  output.write("Hello World ! "); 
 +} 
 +output.flush(); 
 +catch (Exception e) { 
 +  Toast.makeText(mContext, "Settings not saved", Toast.LENGTH_SHORT).show(); 
 +} 
 +finally { 
 +  try { 
 +    output.close(); 
 +    fileWriter.close(); 
 +  } 
 +  catch (IOException e) { 
 +    Toast.makeText(mContext, "Settings not saved", Toast.LENGTH_SHORT).show(); 
 +  } 
 +} 
 +</code> 
 + 
 +As you can understand, this code write the text "Hello World" into the file "config_ecj_in.in".\\ 
  
 [[#begin|Back to begin]] [[#begin|Back to begin]]
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 Now, you can use this file as in the previous [[#collectInfo|example]].\\  Now, you can use this file as in the previous [[#collectInfo|example]].\\ 
  
-But, as we said before, ECJ may need a file. Or more precisely, the path of this file.\\ For a population initialization, you give the path of the initialization file to the configuration file.\\ This path is the following one:\\ /data/data/name_of_your_current_project/files/config_ecj_in.in.\\ \\ If you want to initialize your population "config_ecj_in.in" from the configuration file "mainConfigFile.params", add this line in "mainConfigFile.params":\\ pop.file = /data/data/name_of_your_current_project/files/config_ecj_in.in\\  Now, if you load "mainConfigFile.params" as show in this [[#collectInfo|example]] you will also initialize you popullation with "config_ecj_in.in".\\ Simple, isn't it ?\\ Here is the end of our tutorial. Good luck !\\ +But, as we said before, ECJ may need a file. Or more precisely, the path of this file.\\ For a population initialization, you give the path of the initialization file to the configuration file.\\ This path is the following one:\\ /data/data/name_of_your_current_project/files/config_ecj_in.in.\\ \\ If you want to initialize your population "config_ecj_in.in" from the configuration file "mainConfigFile.params", add this line in "mainConfigFile.params": 
 +<code> 
 +pop.file = /data/data/name_of_your_current_project/files/config_ecj_in.in 
 +</code> 
 +Now, if you load "mainConfigFile.params" as show in this [[#collectInfo|example]] you will also initialize you popullation with "config_ecj_in.in".\\ Simple, isn't it ?\\ Here is the end of our tutorial. Good luck !\\ 
  
 [[#begin|Back to begin]] [[#begin|Back to begin]]
  
 Any questions or suggestions ? [[guegan@polytech.unice.fr;fauvelja@polytech.unice.fr;adiaz@polytech.unice.fr;arnaud@polyech.unice.fr?subject=Tutorial%20ECJ%20in%20Android|Contact us !]] Any questions or suggestions ? [[guegan@polytech.unice.fr;fauvelja@polytech.unice.fr;adiaz@polytech.unice.fr;arnaud@polyech.unice.fr?subject=Tutorial%20ECJ%20in%20Android|Contact us !]]
 +
 +<note>written by Ancelin Arnaud, Aliénor Diaz, Olivier Fauvel-Jaeger, Frédéric Guégan in 2013/06</note>
 +
tuto_ecj_android.txt · Last modified: 2014/03/03 16:27 by Denis Pallez