Develop Reference

android replace string by another string in file on sdcard

I've created Test.txt on sdcard and write string "test example" on it.
after that, I replace string "test" by "etc" in Test.txt.
this is my code :
String origin_str, old_str , new_str;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_t2);
origin_str = "test example";
old_str = "test";
new_str = "etc";
Button bt_create2 = (Button)findViewById(R.id.bt_createfileT2);
bt_create2.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
try {
File newFolder = new File(Environment.getExternalStorageDirectory(), "TestFolder");
if (!newFolder.exists()) {
newFolder.mkdir();
}
File file = new File(newFolder, "Test" + ".txt");
if (!file.exists()) {
file.createNewFile();
FileOutputStream fOut = new FileOutputStream(file);
OutputStreamWriter myOutWriter =new OutputStreamWriter(fOut);
myOutWriter.append(origin_str);
myOutWriter.close();
fOut.close();
}
} catch (Exception e) {
System.out.println("e: " + e);
}
}
});
Button bt_replacefileT2 = (Button)findViewById(R.id.bt_replacefileT2);
bt_replacefileT2.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
try {
File file = new File(Environment.getExternalStorageDirectory() + "/TestFolder/Test.txt");
FileInputStream in = new FileInputStream(file);
int len = 0;
byte[] data1 = new byte[1024];
while ( -1 != (len = in.read(data1)) ){
if(new String(data1, 0, len).contains(old_str)){
String s = "";
s = s.replace(old_str, new_str);
}
}
}
catch (Exception e){
e.printStackTrace();
}
}
});
with this code, it was create Test.txt on sdcard and write "test example" on it.
but when replace string "test" by "etc", it not working.
how to fix it?

I will give my code, always worked for me :)
Hope thi can help you :DD
public void saveString(String text){
if(this.isExternalStorageAvailable()){
if(!this.isExternalStorageReadOnly()){
try {
FileOutputStream fos = new FileOutputStream(
new File(this.getExternalFilesDir("text"), "text.dat"));
ObjectOutputStream oos = new ObjectOutputStream(fos);
oos.writeBytes(text);
oos.close();
fos.close();
} catch (FileNotFoundException e) {
//Toast.makeText(main, "Eror opening file", Toast.LENGTH_SHORT).show();
} catch (IOException e) {
//Toast.makeText(main, "Eror saving String", Toast.LENGTH_SHORT).show();
}
}
}
}
private static boolean isExternalStorageAvailable(){
String estadoSD = Environment.getExternalStorageState();
if(Environment.MEDIA_MOUNTED.equals(estadoSD))
return true;
return false;
}
private static boolean isExternalStorageReadOnly(){
String estadoSD = Environment.getExternalStorageState();
if(Environment.MEDIA_MOUNTED_READ_ONLY.equals(estadoSD))
return true;
return false;
}
public String getString(){
FileInputStream fis = null;
ObjectInputStream ois = null;
if(this.isExternalStorageAvailable()) {
try {
fis = new FileInputStream(
new File(this.getExternalFilesDir("text"), "text.dat"));
ois = new ObjectInputStream(fis);
String text = (String)ois.readObject();
return familia;
} catch (FileNotFoundException e) {
//Toast.makeText(main, "The file text doesnt exist", Toast.LENGTH_SHORT).show();
} catch (StreamCorruptedException e) {
//Toast.makeText(main, "Eror opening file", Toast.LENGTH_SHORT).show();
} catch(EOFException e){
try {
if(ois != null)
ois.close();
if(fis != null)
fis.close();
} catch (IOException e1) {
e1.printStackTrace();
}
} catch (IOException e) {
//Toast.makeText(main, "eror reading file", Toast.LENGTH_SHORT).show();
} catch (ClassNotFoundException e) {
//Toast.makeText(main, "String class doesnt exist", Toast.LENGTH_SHORT).show();
}
}
return null;
}

try this
File file = new File(Environment.getExternalStorageDirectory() + "/TestFolder/Test.txt");
try {
BufferedReader br = new BufferedReader(new FileReader(file));
String line;
while ((line = br.readLine()) != null) {
line = line.replace(old,new);
}
br.close();
FileOutputStream fOut = new FileOutputStream(file);
OutputStreamWriter myOutWriter =new OutputStreamWriter(fOut);
myOutWriter.write(line);
myOutWriter.close();
fOut.close();
}
catch (IOException e) {
//You'll need to add proper error handling here
}

How to save durably a file on internal storage

I am currently encountering a problem saving a text file on the internal storage.
The problem is that whenever i exit the application, the file seems to be deleted.
I wrote this method that is called at the start of the application, to create a blank text file :
private void init() {
String FILE_NAME = "save.txt";
try {
new BufferedWriter(new FileWriter(getFilesDir() + FILE_NAME));
Toast.makeText(this, "GOOD", Toast.LENGTH_LONG).show();
} catch (Exception e) {
Toast.makeText(this, e.getMessage(), Toast.LENGTH_LONG).show();
}
}
this function is called to read all lines written in it :
private List<String> readFromFile() {
List<String> ret = new ArrayList<>();
try {
InputStream inputStream = new FileInputStream(getFilesDir()+"save.txt");
BufferedReader bReader = new BufferedReader(new InputStreamReader(inputStream));
String line;
while ((line = bReader.readLine()) != null) {
ret.add(line);
}
} catch (IOException e) {
Toast.makeText(this, e.getMessage(), Toast.LENGTH_LONG).show();
}
Toast.makeText(this, "GOOD", Toast.LENGTH_LONG).show();
return ret;
}
And finaly this method is called to append a string in the text file if it's not already in it :
private void save(String unNom) {
String FILE_NAME = "save.txt";
List<String> ret = new ArrayList<>();
try {
InputStream inputStream = new FileInputStream(getFilesDir()+"save.txt");
BufferedReader bReader = new BufferedReader(new InputStreamReader(inputStream));
String line;
while ((line = bReader.readLine()) != null) {
ret.add(line);
}
if(!ret.contains(unNom)){
ret.add(unNom);
}
bReader.close();
FileOutputStream fos = new FileOutputStream(getFilesDir() +FILE_NAME);
for (String ligne: ret) {
ligne+="\n";
fos.write(ligne.toString().getBytes());
}
fos.flush();
fos.close();
Toast.makeText(this, "GOOD", Toast.LENGTH_LONG).show();
} catch (Exception e) {
Toast.makeText(this, e.getMessage(), Toast.LENGTH_LONG).show();
}
}
What should I do to save correctly the file in the internal storage ?
Sorry for my bad english,
Thank you for your help !

The init was'nt necessary. I removed the method and I edited the save method, so it could create a new file if a not found exception was raised :
private void save(String unNom) {
String FILE_NAME = "save.txt";
List<String> ret = new ArrayList<>();
try {
InputStream inputStream = openFileInput("save.txt");
BufferedReader bReader = new BufferedReader(new InputStreamReader(inputStream));
String line;
while ((line = bReader.readLine()) != null) {
ret.add(line);
}
if (!ret.contains(unNom)) {
ret.add(unNom);
}
bReader.close();
FileOutputStream fos = null;
fos = openFileOutput("save.txt", this.MODE_PRIVATE);
for (String ligne : ret) {
ligne = "\n" + ligne;
fos.write(ligne.getBytes());
}
fos.close();
Toast.makeText(this, "GOOD", Toast.LENGTH_LONG).show();
} catch (Exception e) {
try {
Toast.makeText(this, e.getMessage(), Toast.LENGTH_LONG).show();
FileOutputStream fos = null;
fos = openFileOutput("save.txt", this.MODE_PRIVATE);
fos.write(unNom.getBytes());
fos.close();
Toast.makeText(this, "NEW FILE", Toast.LENGTH_LONG).show();
}
catch(Exception e2){}
}
}

Android Studio - Why does a string array cause my program to stop?

I have been working on this for a while and I am about to pull my hair out!!
If I use this...
public void readFile() {
BufferedReader buffReader = null;
StringBuilder result = new StringBuilder();
try {
FileInputStream fileIn = openFileInput("VariableStore.txt");
buffReader = new BufferedReader(new InputStreamReader(fileIn));
String line;
while ((line = buffReader.readLine()) != null) {
result.append(line);
}
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
assert buffReader != null;
buffReader.close();
} catch (IOException e) {
e.printStackTrace();
}
}
String resultString = result.toString();
String[] controlString = resultString.split("$");
// String wb = controlString[4];
// String sb = controlString[5];
((Button) this.findViewById(R.id.wakeButton)).setText(resultString);
// ((Button) this.findViewById(R.id.sleepButton)).setText(sb);
// ((Button)this.findViewById(R.id.wakeButton)).setText(result);
// ((Button)this.findViewById(R.id.wakeButton)).setText(result);
// ((Button)this.findViewById(R.id.wakeButton)).setText(result);
}
The Button.setText works fine with "resultString" or with "result" which is a string I have input formatted as xxx$xxx$xxx$xxx$xxx so when I read it back in with the readFile() I want to use .Split and put it into an array "controlString" and then assign the array elements to my widgets i.e. setText(controlString[0]); but if I so much as even uncomment the lines String wb = controlString[4]; or String sb = controlString[5]; my program crashes. Why wont the array elemts work here?
Here is my writeFile().... (Which works perfectly.
public void writeFile() {
BufferedWriter buffWriter = null;
String wb = ((Button)this.findViewById(R.id.wakeButton)).getText().toString();
String sb = ((Button)this.findViewById(R.id.sleepButton)).getText().toString();
String tb = ((EditText)this.findViewById(R.id.textHoursBetween)).getText().toString();
String ti = ((EditText)this.findViewById(R.id.textIncrementTime)).getText().toString();
String td = ((EditText)this.findViewById(R.id.textIncrementDays)).getText().toString();
String writeString = wb + "$" + sb + "$" + tb + "$" + ti + "$" + td;
try {
FileOutputStream fileOut = openFileOutput("VariableStore.txt", Context.MODE_PRIVATE);
buffWriter = new BufferedWriter(new OutputStreamWriter(fileOut));
try {
buffWriter.write(writeString);
} catch (IOException e) {
e.printStackTrace();
}
} catch (FileNotFoundException e) {
e.printStackTrace();
}finally {
try {
assert buffWriter != null;
buffWriter.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}

I found the problem...
Instead of this:
String[] controlString = resultString.split("$");
I had to use this:
String[] controlString = resultString.split(Pattern.quote("$"));

Saving int values to SD and read them

I have succesfully saved int values to sd but cant read. It always gives numberformat information. I made all logics, but cant find why it gives error.
Here is my code ;
this my constant
private final static String EXTERNAL_FILES_DIR = "ARDROID";
private final static String FILE_NAME = "turkcell.txt";
private boolean isThereAnySavedFile = false;
when this method called, it tries to open file, if file does not exist, create the file
public void anySavedDataInSD() {
String textFromSD = String.valueOf(read());
if (isThereAnySavedFile) {
int numberOfSendedSMS = Integer.parseInt(textFromSD.toString());
numberOfSendedSMS++;
writeToSD(String.valueOf(numberOfSendedSMS));
} else {
int first=60;
String g = String.valueOf(first);
writeToSD(g);
}
}
this method for writing
private void write(File file, String msg) {
FileOutputStream outputStream = null;
try {
outputStream = new FileOutputStream(file);
outputStream.write(msg.getBytes());
Logger.info("oldu bu kez");
} catch (IOException e) {
Logger.info("oldu bu kez2" + e);
} finally {
Logger.info("oldu bu kez3");
try {
if (outputStream != null)
outputStream.close();
} catch (IOException exception) {
}
}
}
this methof for reading
public StringBuilder read() {
StringBuilder textBuilder = new StringBuilder();
BufferedReader reader = null;
try {
File externalFilesDir = getExternalFilesDir(EXTERNAL_FILES_DIR);
File file = new File(externalFilesDir, FILE_NAME);
Logger.info("oldu2");
reader = new BufferedReader(new FileReader(file));
String line;
while ((line = reader.readLine()) != null) {
textBuilder.append(line);
textBuilder.append("\n");
}
isThereAnySavedFile = true;
} catch (FileNotFoundException e) {
Logger.info("oldu3");
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
if (reader != null) {
try {
reader.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
return textBuilder;
}

How can I read .txt and display it as TextView in Android?

I am using the code below to read the the txt files from my SD card, but how can I display it as Text View?
try{
File f = new File(Environment.getExternalStorageDirectory()+"/filename.txt");
FileInputStream fileIS = new FileInputStream(f);
BufferedReader buf = new BufferedReader(new InputStreamReader(fileIS));
String readString = new String();
//just reading each line and pass it on the debugger
while((readString = buf.readLine())!= null){
Log.d("line: ", readString);
}
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e){
e.printStackTrace();
}

This should do it :
public void displayOutput()
{
File sdcard = Environment.getExternalStorageDirectory();
File file = new File(sdcard,"/TextFile.txt");
StringBuilder text = new StringBuilder();
try {
BufferedReader br = new BufferedReader(new FileReader(file));
String line;
while ((line = br.readLine()) != null) {
text.append(line);
text.append('\n');
}
}
catch (IOException e) {
Toast.makeText(getApplicationContext(),"Error reading file!",Toast.LENGTH_LONG).show();
e.printStackTrace();
}
catch (FileNotFoundException e) {
Toast.makeText(getApplicationContext(),"File not found!",Toast.LENGTH_LONG).show();
e.printStackTrace();
}
TextView output=(TextView) findViewById(R.id.output);
// Assuming that 'output' is the id of your TextView
output.setText(text);
}

LinearLayout myVerticalLinearLayout = (LinearLayout) findViewById(R.id.myLinearLayout);
TextView text = new TextView(getApplicationContext());
text.setText(readString);
myVerticalLinearLayout.addView(text);
That should add vertical text views in a linear layout you should have created before.

public String readText(){
//this is your text
StringBuilder text = new StringBuilder();
try{
File f = new File(Environment.getExternalStorageDirectory()+"/filename.txt");
FileInputStream fileIS = new FileInputStream(f);
BufferedReader buf = new BufferedReader(new InputStreamReader(fileIS));
String readString = "";
//just reading each line and pass it on the debugger
while((readString = buf.readLine())!= null){
Log.d("line: ", readString);
text.append(readString + "\n");
}
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e){
e.printStackTrace();
}
return text.toString();
}
...
TextView tv=findViewById(.....);
tv.setText(readText());

public class ReadFileActivity extends Activity {
/** Called when the activity is first created. */
TextView text;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
text=(TextView)findViewById(R.id.textview);
text.setText(readTxt());
}
private String readTxt(){
InputStream inputStream = getResources().openRawResource(R.raw.aaa);
ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
int i;
try {
i = inputStream.read();
while (i != -1)
{
byteArrayOutputStream.write(i);
i = inputStream.read();
}
inputStream.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return byteArrayOutputStream.toString();
}
}