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我在Android中測試tuProlog。我有一個活動TuProlog類parser與prolog代碼和包含prolog代碼的data.pl進行交互。作爲一個java項目，輸出到控制檯，我可以很好地運行它，但是我作爲一個Android項目遇到了麻煩。對於Android，即使我的文件data.pl複製到項目的根目錄，src內部和我的包中，但我仍然得到FileNotFoundException。我只想將結果作爲字符串獲取並在TextView中顯示我的結果。這裏是我的代碼在Android中運行序言
public class TuProlog extends Activity implements OnClickListener{
TextView tv;
Button b1;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
tv = (TextView)findViewById(R.id.label);
b1 = (Button)findViewById(R.id.button1);
b1.setOnClickListener(this);
}
@Override
public void onClick(View v) {
Parser custom = new Parser();
String result = custom.parse();
tv.setText(result);
}
}
public class Parser {
Prolog engine;
PrintStream orgStream = System.out;
ByteArrayOutputStream baos = new ByteArrayOutputStream();
PrintStream psout = new PrintStream(baos, Boolean.TRUE); // Using autoFlush
String myResult ;
public String parse()
{
engine = new Prolog();
try{
Theory t = new Theory(new FileInputStream("data.pl"));
try{
engine.setTheory(t);
try{
SolveInfo answer = engine.solve("likes(john,X).");
try{
Term derivative = answer.getTerm("X");
return myResult;;
}
catch (NoSolutionException e){
e.printStackTrace();
}
catch (UnknownVarException e){
e.printStackTrace();
}
}
catch (MalformedGoalException e){
e.printStackTrace();
}
}
catch (InvalidTheoryException e){
e.printStackTrace();
}
}
catch (FileNotFoundException e){
e.printStackTrace();
}
catch (IOException e){
e.printStackTrace();
}
return null;
}
@Override
public void onSpy(SpyEvent e) {
// TODO Auto-generated method stub
Log.d("TAG", "** LG'd onSpy => SpyEvent Occured ** ");
System.out.println("** onSpy => SpyEvent Occured ** \n ");
myResult = e.getMsg();
}
@Override
public void onOutput(OutputEvent e) {
// TODO Auto-generated method stub
Log.d("TAG", "** LG'd: onOutput => OutputEvent Occured ** ");
System.out.println("** onOutput => OutputEvent Occured ** \n ");
myResult = e.getMsg();
}
@Override
public void onWarning(WarningEvent e) {
// TODO Auto-generated method stub
Log.d("TAG", "** LG'd: onWarning => WarningEvent Occured ** ");
System.out.println("** onWarning => WarningEvent Occured ** \n ");
myResult = e.getMsg();
}
}
Data.pl
likes(john,mary).
likes(mary,wine).
，這裏是我的logcat輸出，我不知道System.err的
04-15 18:51:25.480: W/System.err(23813): java.io.FileNotFoundException: /data.pl (No such file or directory)
04-15 18:51:25.484: W/System.err(23813): at org.apache.harmony.luni.platform.OSFileSystem.open(Native Method)
04-15 18:51:25.484: W/System.err(23813): at dalvik.system.BlockGuard$WrappedFileSystem.open(BlockGuard.java:232)
04-15 18:51:25.484: W/System.err(23813): at java.io.FileInputStream.<init>(FileInputStream.java:80)
04-15 18:51:25.484: W/System.err(23813): at java.io.FileInputStream.<init>(FileInputStream.java:132)
04-15 18:51:25.484: W/System.err(23813): at com.tuprolog.alicia.Parser.parse(Parser.java:32)
04-15 18:51:25.484: W/System.err(23813): at com.tuprolog.alicia.TuProlog.onClick(TuProlog.java:51)
04-15 18:51:25.484: W/System.err(23813): at android.view.View.performClick(View.java:2485)
04-15 18:51:25.484: W/System.err(23813): at android.view.View$PerformClick.run(View.java:9080)
04-15 18:51:25.484: W/System.err(23813): at android.os.Handler.handleCallback(Handler.java:587)
感謝@ProfVersaggi – Yogesh 2012-04-25 01:05:58