We Keep Coding

Call the saved text from any activitie

public void getData(View view) {
try {
FileInputStream fileInput = openFileInput("user_data.txt");
InputStreamReader reader = new InputStreamReader(fileInput);
BufferedReader buffer = new BufferedReader(reader);
StringBuffer strBuffer = new StringBuffer();
String lines;
while ((lines = buffer.readLine()) != null) {
strBuffer.append(lines); //Вывод имени
}
textView3.setText(strBuffer.toString());
} catch (FileNotFoundException e){
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} }
public void saveData (View view) {
String user_name = editSave.getText().toString();
try {
FileOutputStream fileOutput = openFileOutput("user_data.txt", MODE_PRIVATE);
fileOutput.write((user_name).getBytes());
fileOutput.close();
textView3.setText(user_name);
Toast.makeText(setting.this, " ", Toast.LENGTH_SHORT).show();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
Hello. I'm just learning. I need user_name to be called from any activity so I can insert it into the code that passes the text, right now I can't do it.
I will now try to explain what I want to get: textView.setText("random text" + user_name + "text random")
I would be very grateful if you could edit my code.

save server response in sqlite database(offline)

i call below php webservice and get xml response and parse resonse and set it to hashmap.now i want save server response in offline mode .can i save data in offline mode.how plz give me answer.
#Override
protected void onPostExecute(Void result) {
super.onPostExecute(result);
if (pDialog.isShowing())
pDialog.dismiss();
try {
if (response.length() > 0) {
int code = Integer.parseInt(XMLManualParser.getTagValue(Constant.TAG_CODE, response));
if (code == 1) {
spinner.clear();
ArrayList<String> eventlist = XMLManualParser.getMultipleTagList(Constant.TAG_LIST, response);
for (int i = 0; i < eventlist.size(); ++i) {
String responseContent = eventlist.get(i);
HashMap<String, String> hashMap = new HashMap<String, String>();
String title = XMLManualParser.getTagValue(Constant.title, responseContent);
hashMap.put("title", title);
hashMap.put("id", XMLManualParser.getTagValue(Constant.id, responseContent));
hashMap.put("url", XMLManualParser.getTagValue(Constant.url, responseContent));
hashMap.put("balanceurl", XMLManualParser.getTagValue(Constant.balanceurl, responseContent));
spinner.add(hashMap);
}
} else {
Toast.makeText(SettingsEditActivity.this, "no data found", Toast.LENGTH_SHORT).show();
}
CustomSpinnerAdapter customSpinnerAdapter = new CustomSpinnerAdapter(SettingsEditActivity.this, spinner);
settingsBinding.splist.setAdapter(customSpinnerAdapter);
settingsBinding.splist.setOnItemSelectedListener(new OnItemSelectedListener() {
#Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
item = parent.getItemAtPosition(position).toString();
// Toast.makeText(parent.getContext(), "Android Custom Spinner Example Output..." + item, Toast.LENGTH_LONG).show();
}
#Override
public void onNothingSelected(AdapterView<?> parent) {
}
});
}
} catch (Exception e) {
e.printStackTrace();
}
}
}

You can save your response into a file and get in offline
public static void saveDataSingleItemDetails(Context context,String file, MainListModel data) {
FileOutputStream fileOutputStream = null;
try {
fileOutputStream = context.openFileOutput(file, MODE_PRIVATE);
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (NullPointerException e) {
return;
}
ObjectOutputStream objectOutputStream = null;
try {
objectOutputStream = new ObjectOutputStream(fileOutputStream);
} catch (IOException | NullPointerException e) {
e.printStackTrace();
}
try {
if (objectOutputStream != null) {
objectOutputStream.writeObject(data);
}
} catch (IOException e) {
e.printStackTrace();
}
try {
if (objectOutputStream != null) {
objectOutputStream.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
public static MainListModel getSinglItemDetails(Context context,String file) {
MainListModel items = null;
FileInputStream fileInputStream = null;
try {
fileInputStream = context.openFileInput(file);
} catch (FileNotFoundException e) {
e.printStackTrace();
return items;
} catch (NullPointerException e) {
return items;
}
ObjectInputStream objectInputStream = null;
try {
objectInputStream = new ObjectInputStream(fileInputStream);
} catch (IOException | NullPointerException e) {
e.printStackTrace();
return items;
}
try {
items = (MainListModel) objectInputStream.readObject();
} catch (IOException e) {
e.printStackTrace();
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
try {
objectInputStream.close();
} catch (IOException e) {
e.printStackTrace();
}
return items;
}

trying to write to read and write to a text file in eclipse

I am trying to write and read to a text file name students but I am having all kinds of hassles I am very new to android programming so I am trying this out for the first time. I have looked at code here and there to try and figure out what I am doing wrong but I cant find one specific thing to help, this question has probably been asked a couple of times, so I am sorry for asking it again. Please see my different .xml and .java files below. The actual question is to be able to write data to a textfile and from the main screen click on a textfield which will take you to the edit screen, where you get to edit that specific field and save it to a text file (this however has not been done yet as I am still struggling to figure out why my writing and reading to the textfile is not working, I hope my poor attempt at coding will shed some light on the matter.
Please don't crucify me for my bad coding I am super new to android
/////////////////////////////add screen.java///////////////////////////////
public class AddNew extends Activity {
private static final String newLine = System.getProperty("line.separator");
TextView txtText;
EditText Modules;
EditText Types;
#Override
protected void onCreate(Bundle SavedInstanceState){
super.onCreate(SavedInstanceState);
setContentView(R.layout.add);
txtText = (TextView)findViewById(R.id.textView1);
Modules = (EditText)findViewById(R.id.etMod);
Types = (EditText)findViewById(R.id.etType);
Button backMan = (Button)findViewById(R.id.btnBackMain);
backMan.setOnClickListener(new OnClickListener(){
public void onClick(View v){
//This is where your code will go
startActivity(new Intent(AddNew.this, MainActivity.class));
}
}); //end back Button
//get the day, month & year from the Date picker
DatePicker myDPicker = (DatePicker)findViewById(R.id.dpDate);
Integer Year = myDPicker.getYear();
Integer Month = myDPicker.getMonth();
Integer Day = myDPicker.getDayOfMonth();
StringBuilder sb = new StringBuilder();
sb.append(Year.toString()).append("-").append(Month.toString()).append
("-").append(Day.toString());
final String dobStr=sb.toString();
txtText.setText("TEST");
Button Save = (Button)findViewById(R.id.btnSaveAdded);
Save.setOnClickListener(new OnClickListener(){
public void onClick(View v){
//This is where your code will go
try {
writeToFile(Modules.getText().toString(),
Types.getText().toString(),dobStr);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
private void writeToFile(String Mod, String AsType, String dobDate) throws
IOException {
// TODO Auto-generated method stub
//String textTofile;
StringBuilder sbText = new StringBuilder();
sbText.append(Mod + "," + dobStr + "," + AsType);
//textTofile=sbText.toString();
String fileName = "student";
PrintWriter printWriter = null;
File file = new File(fileName);
try {
if (!file.exists()) file.createNewFile();
printWriter = new PrintWriter(new FileOutputStream(fileName,
true));
printWriter.write(newLine ); //+textTofile);
} catch (IOException ioex) {
ioex.printStackTrace();
} finally {
if (printWriter != null) {
printWriter.flush();
printWriter.close();
}
}
}
}); //end back Button
}
}
`public class MainActivity extends Activity {
TextView fDisplay;
TextView fTest;
int numItems=0; //use it later to keep track of the number of items.
String inText; //use this variable for the information read in from the textfile.
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button but1=(Button)findViewById(R.id.btnAdd);
but1.setOnClickListener(new OnClickListener(){
public void onClick(View v){
//This is where your code will go
startActivity(new Intent(MainActivity.this, AddNew.class));
}
}); //end but1
Button but2 = (Button)findViewById(R.id.btnEditCur);
but2.setOnClickListener(new OnClickListener(){
public void onClick(View v){
//This is where your code will go
startActivity(new Intent(MainActivity.this, EditCur.class));
}
}); //end of button 2
fDisplay = (TextView)findViewById(R.id.tvAssign1);
try {
readFromFile();
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
private void readFromFile() throws IOException {
// TODO Auto-generated method stub
// String ret="";
BufferedReader br;
FileReader fr = null;
try {
fr = new FileReader("student");
br = new BufferedReader(fr);
String line = br.readLine();
while (null != line) {
fDisplay.append(line);
fDisplay.append("\n");
line = br.readLine();
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally {
if (null != fr) {
try {
fr.close();
} catch (IOException e) {
// ignore
}
}
}
}
}
`

For writting on a file I have used this
String filename;
String content;
filename = "PATH_AND_FILE";
content = "CONTENT ON THE FILE"
BufferedWriter out = new BufferedWriter(new FileWriter(filename));
out.write(myString.toString());
out.flush();
out.close();
And for reading I have this function:
public static String readFileAsString() {
String result = "";
String filename;
filename = "PATH_AND_FILE";
File file = new File(filename);
if ( file.exists() ) {
FileInputStream fis = null;
try { fis = new FileInputStream(file);
char current;
while (fis.available() > 0) {
current = (char) fis.read();
result = result + String.valueOf(current);
}
} catch (Exception e) {
// System.out.println("DEBUG Exception String :"+ e.toString());
} finally {
if (fis != null)
{ try {
fis.close();
} catch (IOException ignored) {
}}
else {// System.out.println("DEBUG Exception String NULL");
}
}
return result;
}
else
{
return "DEFAULT CONTENT";
}
}

In Android, the file' directory is different then that on a PC, like :the files are stored in a directory related to your App, the accessing permissions are different.
This link might be helpful:
How To Read/Write String From A File In Android

Two simple functions (Java) to read and write:
private static void writeToFile(String path, String text) {
PrintWriter writer;
try {
writer = new PrintWriter(path, "UTF-8");
writer.print(text);
writer.close();
} catch (FileNotFoundException | UnsupportedEncodingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public static String getFileContent(String filename){
String everything = "";
BufferedReader br = null;
try {
br = new BufferedReader(new FileReader(filename));
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
try {
StringBuilder sb = new StringBuilder();
String line = null;
try {
line = br.readLine();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
while (line != null) {
sb.append(line);
sb.append(System.lineSeparator());
try {
line = br.readLine();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
everything = sb.toString();
} finally {
try {
br.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
return everything;
}

My arrayList doesn't get successfully saved and restored?

I have an activity which contains a listview, the activity (MainActivity) launches another activity (HomeworkAddActivity), this retrieves a string from the user and adds it to the listview (all of the above works).
However in order that the listview 'remembers' its contents whilest the other activity is launched I try to save the list to a file, code:
public void saveHomework() {
try {
#SuppressWarnings("resource")
FileOutputStream fos = new FileOutputStream(homeworkFileName);
fos = openFileOutput(homeworkFileName,
Context.MODE_PRIVATE);
ObjectOutputStream os = new ObjectOutputStream(fos);
os.writeObject(homeworkItems);
os.close();
fos.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
#SuppressWarnings("unchecked")
public void populateHomework() {
try {
#SuppressWarnings("resource")
FileInputStream fis = new FileInputStream(homeworkFileName);
fis = getParent().openFileInput(homeworkFileName);
ObjectInputStream is = new ObjectInputStream(fis);
homeworkItems = (ArrayList<String>) is.readObject();
is.close();
fis.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (StreamCorruptedException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
}
I then read it from the file.
saveHomework is called onPause
and populateHomework:
#Override
public void onResume() {
super.onResume();
homeworkItems = new ArrayList<String>();
activity = this;
homeworkListAdapter = new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_1, homeworkItems);
populateHomework();
homeworkListAdapter.notifyDataSetChanged();
}
However it only ever shows the items added by addHomeworkActivity, not those 'saved' and 'restored' (they don't get saved/restored successfully), why is this?

It has 2 problems
your listview still connect with your old adapter
notifyDataSetChanged might not work in your case, it relate to this answer
notifyDataSetChanged example
you need to reorder your command in onResume()
#Override
public void onResume() {
super.onResume();
homeworkItems = new ArrayList<String>();
activity = this;
populateHomework(); // I move this line up
homeworkListAdapter = new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_1, homeworkItems);
//homeworkListAdapter.notifyDataSetChanged(); // this line might not work
yourListView.setAdapter(homeworkListAdapter); // because your listview still connect with your old ArrayAdapter
}

Why on double click android client received data?

When I click the first time on login button, data send to server and server received data in return on first click data not show on android client screen. When I pressed login button again it again send data and then it show data on client screen... plz help me. Why data is received on secind click i want my data recived on my first click?
Here is the code :
Client tcpip code...
public class SockProg {
private Socket socket;
DataOutputStream dataOutputStream;
DataInputStream dataInputStream;
String data;
String serverip = "192.168.1.7";
int serverport = 4444;
public void connetToServer(){
try {
socket = new Socket(serverip, serverport);
Log.i("AsyncTank", "doInBackgoung: Created Socket");
} catch (UnknownHostException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
if (socket.isConnected()) {
try {
dataOutputStream = new DataOutputStream(
socket.getOutputStream());
dataInputStream = new DataInputStream(socket.getInputStream());
} catch (IOException e) {
e.printStackTrace();
}
}
}
public void writeToStream(String message) {
try {
if (socket.isConnected()){
dataOutputStream.writeUTF(message.toString());
} else {
Log.i("AsynkTask", "writeToStream : Cannot write to stream, Socket is closed");
}
} catch (Exception e) {
Log.i("AsynkTask", "writeToStream : Writing failed");
}
}
public String readFromStream() {
String ret = null;
try {
if (socket.isConnected()) {
Log.i("AsynkTask", "readFromStream : Reading message");
ret=dataInputStream.readUTF();
Log.i("AsynkTask", "readFromStream : read "+ret);
} else {
Log.i("AsynkTask", "readFromStream : Cannot Read, Socket is closed");
}
} catch (Exception e) {
Log.i("AsynkTask", "readFromStream : Reading failed"+e.getClass());
}
return ret;
}
public void CloseSockets(){
if (socket != null) {
try {
socket.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
if (dataOutputStream != null) {
try {
dataOutputStream.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
if (dataInputStream != null) {
try {
dataInputStream.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
here is the code of sychronized thread
public class TCP implements Runnable {
String data;
SockProg sp;
Thread thh;
private static String rdata;
public TCP(SockProg spr, String val) {
sp = spr;
data = val;
thh = new Thread(this);
thh.start();
}
#Override
public void run() {
synchronized(sp) { // synchronized block
//rdata= sp.DataSendRecive(data);
sp.connetToServer();
sp.writeToStream(data);
rdata=sp.readFromStream();
sp.CloseSockets();
}
}
public static String getData(){
return rdata;
}
}
here is code of Login Activity...
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
msg = (TextView) findViewById(R.id.msg_log);
login = (Button) findViewById(R.id.btn_login);
login.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// try{
txtph = (EditText) findViewById(R.id.txt_phnum);
txtpass = (EditText) findViewById(R.id.txt_pass);
ph = txtph.getText().toString();
pass = txtpass.getText().toString();
int ch = 0;
if (ph.equals("") || ph == null) {
msg.setText("Please Enter Mobile Number....\n");
ch++;
}
if (pass.equals("") || pass == null) {
if (ch == 0) {
msg.setText("Please Enter your Password....\n");
} else {
msg.append("Please Enter your Password....\n");
}
ch++;
}
if (ch == 0) {
ArrayList<String> ph_pass = new ArrayList<String>();
ph_pass.add(0, "LoginAccount");
ph_pass.add(1, ph);
ph_pass.add(2, pass);
SockProg sp=new SockProg();
TCP t=new TCP(sp, ph_pass.toString());
data=t.getData();
msg.setText(data);
}
}
});
}

This looks like a classic case of asynchronous coding delay. The TCP class is a runnable and therefor when it is called the first time (the first click on the login button) it starts running, but the Thread does not have enough time to finish
rdata=sp.readFromStream();
in the run() method, therefor data=t.getData(); does not return anything useful. The second click, provides the runnable with enough time populate the rdata with some data and therefor your program works.
When working with asynchrounous code, you need a better way to wait for code to complete what it is doing.
Why is rdata a static type? Make it non-static and then change the getData() method like this:
public synchronized String getData()