I'm trying to get the int value of a text file that have text like:
123456789 12345678 1234567 123456 12345 1234 123 12 1
as you can see every number is different and they are in a same line separated by a "space". I need to get the values separated. to get something like this:
INT1 = 123456789, INT2 = 12345678, INT3 = 1234567;
and so on. I don't create the text so I don't know how much numbers and groups they are, but they are always separated by a "space". I know how to read it. This is how I'm reading it:
try {
TEST1 = new BufferedReader(new FileReader("/sdcard/test.txt")).readLine();
} catch (NumberFormatException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
TEST.setText(""+scaling_available_frequencies);
and I got this output
194208 776175 958253 767883 700246 243663 966618 345199 945363 459833
NOTE: This is just a test.txt that I created to see if it works. The current code will ask the user for entering path and file name.
Now how can I set them to a variable per group?
Thanks
This is one way to parse the String to an integer array:
public int[] toIntArray( String stringFromFile ){
String[] allStrings = stringFromFile.split( "\\s" );
int[] intArray = new int[allStrings.length];
for( int i = 0; i < allStrings.length; ++i ){
try{
intArray[i] = Integer.parseInt( allStrings[i] );
}catch( NumberFormatException e ){
// Do whatever you think is appropriated
intArray[i] = -1;
}
}
return intArray;
}
Hope this helps.
I believe readLine() get you String.
You will need to use the Split() method of String and pass in the regularExpression (whitespace).
then you will need to use Integer.parseInt( ) method and pass in every string to parse them into Integer.
you also need a loop to do the parse until nothing left
Related
In this portion of my app, I have a database which is absorbing data from my light sensor. It has a RowID associated with each row.
In the background I have an AsyncTaskRunner which is reading that table and writing each row to a CSV file. It should loop through the entire table as data is being written to it, looking for all rows for the current TID that have not been copied to CSV. THen it should write the row values to CSV and go back and mark the row as copied.
THe first loop should come in where no it goes back to the database cursor and looks for the next row which has not been copied to the CSV file. After each copy to CSV it should evaluate the size of that CSV file to make sure it is not full. If not Full then should go back to the Database cursor and look for the next row to write to the CSV file. If isfull then it should loop back to LoopMain and start over creating a new CSV file to write to.
While the full method is not complete yet, I am at the part where the row data is suposed to be written to the CSV file. At the moment, it does not write to it. Before I made this method a For Loop, it did, now it does not. I can not figure out what has changed. I have inserted all of these Log comments to follow the method as it passes values, receives values and then does an action to see where it is failing. THe method passes the section where it is to write to the CSV file and continues on, but the file is empty.
public void lightloop(){
//Loop Main
int loopcounter;
LoopMain: for(loopcounter = 0; loopcounter < 4; loopcounter++ ){
Log.d(CSV, "lightloop loopcounter = " + loopcounter);
String CSVFinalFileName=createlightcsv();
Log.w(CSV, "LightLoop, CSVFinalFileName = " + CSVFinalFileName);
//Loop 2
Loop2: for(int useless=1; useless > 0; useless++ ){
String flightRowId = evaluateLightTable(filenamePrefix); //returns the rowid of the first line not transmitted
Log.w(CSV, "LightLoop, flightRowId = " + flightRowId);
Log.d(CSV, "filefullBoolean " + useless);
if(flightRowId != null){
Log.w(CSV, "LightLoop flightRowId is NOT NULL");
//write row to csv
//Get all row values and put into a string
String lightRowValues=fetchLightRowData(flightRowId, filenamePrefix);
Log.w(CSV, "lightLoop, lightRowValues are " + lightRowValues);
//Append that data to the CSV file
Log.w(CSV, "Opening File Output Stream");
try {
FileOutputStream csvfos = mContext.openFileOutput(CSVFinalFileName, Context.MODE_PRIVATE);
} catch (FileNotFoundException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
OutputStreamWriter sensorCSVWriter = new OutputStreamWriter(csvfos);
try {
sensorCSVWriter.append("LIGHT " + lightRowValues);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
/** try {
sensorCSVWriter.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} **/
//mark row as transmitted
SQLDatabase updatelightrow = new SQLDatabase(mContext);
updatelightrow.open();
SQLDatabase.updateLightRow(flightRowId);
updatelightrow.close();
}// end If rowid is not null
//evaluate size of csv
Boolean filefull = CsvStreamer.checkFileSize(CSVFinalFileName);
if(!filefull){
//return to cursor
Log.d(CSV, "lightloop, File is NOT full");
break Loop2;
}else{
Log.d(CSV, "lightloop, File IS full");
//file is full. close it,
//transmit it,
//open a new one
//goto CSV table and mark it transmitted
break LoopMain;
}
}//end Loop2
}//end LoopMain
}
Can anyone see why this is failing to write to the File?
The csvfos is not in the same scope. I assume the class has a property called csvfos also, hence the method is accessing the property and not the csvfos variable created in the try catch.
Try changing
try
{
FileOutputStream csvfos = mContext.openFileOutput(CSVFinalFileName, Context.MODE_PRIVATE);
}
catch (FileNotFoundException e1)
{
// TODO Auto-generated catch block
e1.printStackTrace();
}
to
FileOutputStream csvfos = null;
try
{
csvfos = mContext.openFileOutput(CSVFinalFileName, Context.MODE_PRIVATE);
}
catch (FileNotFoundException e1)
{
// TODO Auto-generated catch block
e1.printStackTrace();
}
This question already has answers here:
How do I compare strings in Java?
(23 answers)
Closed 8 years ago.
I'm trying to get text from server and then check it a to know what actions to take with the text adopted. The problem is that when I try to check if the received text for example is "Exited" the query always return the value "false" when the received text is really "Exited".
Here is the code :
class Get_Message_From_Server implements Runnable
{
public void run()
{
InputStream iStream = null;
try
{
iStream = Duplex_Socket_Acceptor.getInputStream();
}
catch (IOException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
//Create byte array of size image
byte[] Reading_Buffer = null;
try
{
Reading_Buffer = new byte [Duplex_Socket_Acceptor.getReceiveBufferSize()];
//New_Buffer = new byte [100];
}
catch (IOException e1)
{
// TODO Auto-generated catch block
e1.printStackTrace();
}
byte[] Byte_Char_1 = new byte[1];
int Byte_String_Lenght = 0;
//read size
try
{
iStream.read(Reading_Buffer);
String Reading_Buffer_Stream_Lenghtor = new String(Reading_Buffer);
//System.out.println("full : " + Reading_Buffer_Stream_Lenghtor);
Byte_String_Lenght = Reading_Buffer_Stream_Lenghtor.indexOf(new String(Byte_Char_1));
}
catch (IOException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
//Convert to String
Meassage = new String(Reading_Buffer);
Meassage = Meassage.substring(0, Byte_String_Lenght);//The text that received
Message_Getted = 1;
}
}
The query :
if(Message_1 != "Exited")//the message query
{
System.out.println("Continued 253");
continue;
}
Its always return the value - false
its important to know that the message is in Utf - 8 encoding
so how i can to fix the issue ?
If you compare strings by using oparators, Java will not look at the contents of the string but at the reference in memory. To compare String content in Java, you should use the following:
String Message_1; // Hopefully has a value sent by the server
if(Message_1.equals("Exited")) {
// Do stuff when exited
} else {
// Do stuff when not exited
}
String is a variable - and variables should start with lower Case letter - Please read Java Code conventions. Also to check if your message contains string you thing it should just do System.out.println(Message_1); and if the message contains what you expect you compare string doing
if(Message_1.equals("Exited")) {
System.out.println("Yes they are equal");
} else {
System.out.println("No they are not");
}
If this will print "No they are not" that simply means that your variable Message_1 is not what you think it is.. As simple as that. There is no such a thing as .equals method does not work. Its your variable that doesn't ;)
I am kind of learning android...and I would like to know if there is a way to access 3 letter words or 4 letter words or some specif type of words at random from the android User Dictionary class??Considering the fact that android has an auto correct feature I'm guessing it also has a dictionary in it...thus how do I use that...where can I find a proper tutorial?
i have no idea about the code...searched around a lot...please help me with the code and also the explanation possibly :)
I don't know how to access the android dictionary but you can have a "custom" dictionary as a txt file in the app's assets folder. This link has several word lists from around 20,000 words to 200,000 words. You could find more lists with google.
Afterwards, you can read the txt file and add it to an Array List if it matches the word length. A random word can then be selected from the dictionary list. The following code will create the dictionary and select a random word from it.
private ArrayList<String> dictionary;
private int wordLength; //Set elsewhere
private void createDictionary(){
dictionary = new ArrayList<String>();
BufferedReader dict = null; //Holds the dictionary file
AssetManager am = this.getAssets();
try {
//dictionary.txt should be in the assets folder.
dict = new BufferedReader(new InputStreamReader(am.open("dictionary.txt")));
String word;
while((word = dict.readLine()) != null){
if(word.length() == wordLength){
dictionary.add(word);
}
}
} catch (FileNotFoundException e){
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
try {
dict.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
//Precondition: the dictionary has been created.
private String getRandomWord(){
return dictionaryList.get((int)(Math.random() * dictionaryList.size()));
}
I'm facing a different problem, see below is the code for my app that can read stored file and have to check condition according to that.
My inputs are "ON" and "OFF"
String val="";
final ToggleButton start = (ToggleButton) findViewById(R.id.startup);
FileInputStream fileos;
try {
fileos = openFileInput("startup");
byte[] input = new byte[fileos.available()];
while(fileos.read(input) != -1){
val += new String(input);
}
if(val.toString() == "ON"){
start.setChecked(true);
}else if(val.toString() == "OFF"){
start.setChecked(false);
}else{
start.setChecked(true);
}
fileos.close();
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
The above code fetching the output correctly either "ON" or "OFF", But it Always going into else conditionelse
else{ start.setChecked(true); }
I'm stucked here, Please help me some one
android is based in java , in java you can't use "==" to compare two strings , you should replace
val.toString() == "ON"
to
"ON".equals(val.toString())
There are actually two big problems with this code. One is that you must use the equals() method to compare String objects, always -- the == operator is appropriate only in very limited cases.
The second one is more subtle, and won't break all the time. When you read data into input, although you're using a loop, the code will only work if all the data is read at once. This is because you're creating a String out of the entire array, even if the entire array doesn't contain valid data. The correct loop would look like this:
int count;
while((count = fileos.read(input)) != -1){
val += new String(input, 0, count);
}
you have to compare the string using .equals()
if(val.equals("ON")){
start.setChecked(true);
}else if(val.equals("OFF")){
start.setChecked(false);
}else{
start.setChecked(true);
}
Use String.equals() to compare Strings. Do no use ==
val.toString().equals("ON")
So All I'm trying to do is create a dynamic expandableListView Currently It works if I just do the groupViews. The problem comes in when I have to populate the children of those groupViews.. I don't know if I'm doing something wrong, or if theres another better way to do it. If anyone knows please let me know. I'm open to anything.
Currently I'm pulling my data off a server and the error I'm getting is java null pointer exception. So I'm thinking it might have something to do with how big I specified my array sizes?
private static String[][] children = new String[7][4];
private static String[] groups = new String[7];
Here is the rest of the code when I try to populate the View.
public void getData(){
try {
int tempGroupCount = 0;
URL food_url = new URL (Constants.SERVER_DINING);
BufferedReader my_buffer = new BufferedReader(new InputStreamReader(food_url.openStream()));
temp = my_buffer.readLine();
// prime read
while (temp != null ){
childrenCount = 0;
// check to see if readline equals Location
//Log.w("HERasdfsafdsafdsafE", temp);
// start a new location
if (temp.equalsIgnoreCase("Location"))
{
temp = my_buffer.readLine();
groups[tempGroupCount] = temp;
tempGroupCount++;
Log.w("HERE IS TEMP", temp);
}
temp = my_buffer.readLine();
while (temp.equalsIgnoreCase("Location") == false){
Log.w("ONMG HEHREHRHERHER", temp);
children[groupCount][childrenCount] = "IAJHSDSAD";
childrenCount++;
temp = my_buffer.readLine();
}
groupCount++;
}
my_buffer.close();
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
Log.e("IO EXCEPTION", "Exception occured in MyExpandableListAdapter:" + e.toString());
}
}
to me it looks like an error in the loop - as you are reading another line without checking is it null
your while loop should look something like this methinks:
// prime read
while (temp != null ){
int childrenCount = 0;
// check to see if readline equals Location
// start a new location
//Log.w("HERasdfsafdsafdsafE", temp);
if (temp.equalsIgnoreCase("Location"))
{
temp = my_buffer.readLine();
groups[tempGroupCount] = temp;
tempGroupCount++;
Log.w("HERE IS TEMP", temp);
}
//>>remove following line as that one isn't checked and
//>>you are loosing on a line that is potentialy a child
//temp = my_buffer.readLine();
//>>check do you have first item to add subitems
else if (tempGroupCount>0){
while (temp.equalsIgnoreCase("Location") == false){
Log.w("ONMG HEHREHRHERHER", temp);
children[tempGroupCount-1][childrenCount] = "IAJHSDSAD";
childrenCount++;
temp = my_buffer.readLine();
}
//>>next counter is probably not need but can't see if you're using it somewhere else
//groupCount++;
}
I would first replace strings array to some 2d collection for example arraylist2d ( you can google it ) so you could easally add and remove data from list. If you created adapter that extends BaseExpandableListAdapter everything should be handled without any problems.
About NULLPointer, could you paste stacktrace or more info on which line it occurs ?