I have written a method to print Logs in file. This is working. My only concern is that the logs are been replaced by new logs. Is there any way to keep logs appending ??
public static void printLog(Context context){
String filename = context.getExternalFilesDir(null).getPath() + File.separator + "my_app.log";
String command = "logcat -d *:V";
Log.d(TAG, "command: " + command);
try{
Process process = Runtime.getRuntime().exec(command);
BufferedReader in = new BufferedReader(new InputStreamReader(process.getInputStream()));
String line = null;
try{
File file = new File(filename);
file.createNewFile();
FileWriter writer = new FileWriter(file);
while((line = in.readLine()) != null){
writer.write(line + "\n");
}
writer.flush();
writer.close();
}
catch(IOException e){
e.printStackTrace();
}
}
catch(IOException e){
e.printStackTrace();
}
}
Try this:
public static void printLog(String logData) {
try {
File logFile = new File(Environment.getExternalStorageDirectory(),
"yourLog.txt");
if (!logFile.exists()) {
try {
logFile.createNewFile();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
try {
BufferedWriter buf = new BufferedWriter(new FileWriter(logFile,
true));
buf.append(logData);
buf.newLine();
buf.close();
} catch (IOException e) {
e.printStackTrace();
}
} catch (Exception e) {
e.printStackTrace();
}
}
You are not writing the file in Append mode.
Use new FileWriter(file,true) instead of new FileWriter(file)
More easy way to write to your sdcard:
try {
FileWriter f = new FileWriter(Environment.getExternalStorageDirectory()+
"/mytextfile.txt", true);
f.write("Hello World");
f.flush();
f.close();
}
The boolean in the constructor of FileWriter says its only allowed to append:
http://developer.android.com/reference/java/io/FileWriter.html#FileWriter(java.io.File, boolean)
Related
I have created a file and written into the file using editText. Now I want to write into a file named "note.txt". But the content to be written should be stored in a variable. Can any one help me with the code??
private void writeFile() {
File extStore = Environment.getExternalStorageDirectory();
// ==> /storage/emulated/0/note.txt
String path = extStore.getAbsolutePath() + "/" + fileName;
Log.i("ExternalStorageDemo", "Save to: " + path);
String data = editText.getText().toString();
try {
File myFile = new File(path);
myFile.createNewFile();
FileOutputStream fOut = new FileOutputStream(myFile);
OutputStreamWriter myOutWriter = new OutputStreamWriter(fOut);
myOutWriter.append(data);
myOutWriter.close();
fOut.close();
Toast.makeText(getApplicationContext(), fileName + " saved", Toast.LENGTH_LONG).show();
} catch (Exception e) {
e.printStackTrace();
}
}
Do you mean this?:
private void save(String inputText) {
FileOutputStream out = null;
BufferedWriter writer = null;
try{
out = openFileOutput("note.txt",Context.MODE_PRIVATE);
writer = new BufferedWriter(new OutputStreamWriter(out));
writer.write(inputText);
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}finally {
try{
if (writer!=null);
writer.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
I want save my android application logs on a text file and send it via email in order to handling exceptions and feedback. I implemented following codes in my application, but logs text file contains nothing and is empty after executing code.
try {
Process process = Runtime.getRuntime().exec("logcat -d");
BufferedReader bufferedReader = new BufferedReader(
new InputStreamReader(process.getInputStream()));
StringBuilder logString = new StringBuilder();
String line;
while ((line = bufferedReader.readLine()) != null) {
logString.append(line);
}
File logFile = new File("sdcard/log.txt");
if (!logFile.exists()) {
try {
logFile.createNewFile();
} catch (IOException e) {
e.printStackTrace();
}
}
BufferedWriter buf = new BufferedWriter(new FileWriter(logFile, true));
buf.append(logString);
buf.newLine();
buf.close();
} catch (IOException e) {
e.printStackTrace();
}
I used Log.i, Log.e and Log.w for writing log messages to logcat in my whole application.
I would be grateful if anyone guide me to addressing my problem.
Try This,
public static void appendLog(String text) {
if (true) {
File root = android.os.Environment.getExternalStorageDirectory();
File dir = new File(root.getAbsolutePath() + "/YourAppName");
dir.mkdir();
File logFile = new File(dir, "YourAppName.txt");
if (!logFile.exists()) {
try {
logFile.createNewFile();
} catch (IOException e) {
e.printStackTrace();
}
}
try {
// BufferedWriter for performance, true to set append to file
// flag
BufferedWriter buf = new BufferedWriter(new FileWriter(logFile,
true));
buf.append(text
+ " - "
+ new SimpleDateFormat("MM/dd/yyyy HH:mm:ss")
.format(new Date()));
buf.newLine();
buf.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
and Used this method instead of Log.i, Log.e and Log.w in your application
i am trying to create a file in the internal storage, i followed the steps in android developers website but when i run the below code there is no file created
please let me know what i am missing in the code
code:
File file = new File(this.getFilesDir(), "myfile");
try {
file.createNewFile();
} catch (IOException e) {
e.printStackTrace();
}
FileOutputStream fOut = null;
try {
fOut = openFileOutput("myfile",Context.MODE_PRIVATE);
} catch (FileNotFoundException e) {
e.printStackTrace();
}
try {
fOut.write("SSDD".getBytes());
} catch (IOException e) {
e.printStackTrace();
}
try {
fOut.close();
} catch (IOException e) {
e.printStackTrace();
}
By default these files are private and are accessed by only your application and get deleted , when user delete your application
For saving file:
public void writeToFile(String data) {
try {
FileOutputStream fou = openFileOutput("data.txt", MODE_APPEND);
OutputStreamWriter outputStreamWriter = new OutputStreamWriter(fou);
outputStreamWriter.write(data);
outputStreamWriter.close();
}
catch (IOException e) {
Log.e("Exception", "File write failed: " + e.toString());
}
}
For loading file:
public String readFromFile() {
String ret = "";
try {
InputStream inputStream = openFileInput("data.txt");
if ( inputStream != null ) {
InputStreamReader inputStreamReader = new InputStreamReader(inputStream);
BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
String receiveString = "";
StringBuilder stringBuilder = new StringBuilder();
while ( (receiveString = bufferedReader.readLine()) != null ) {
stringBuilder.append(receiveString);
}
inputStream.close();
ret = stringBuilder.toString();
}
}
catch (FileNotFoundException e) {
Log.e("login activity", "File not found: " + e.toString());
} catch (IOException e) {
Log.e("login activity", "Can not read file: " + e.toString());
}
return ret;
}
Try to get the path for storing files were the app has been installed.The below snippet will give app folder location and add the required permission as well.
File dir = context.getExternalFilesDir(null)+"/"+"folder_name";
If you are handling files that are not intended for other apps to use, you should use a private storage directory on the external storage by calling getExternalFilesDir(). This method also takes a type argument to specify the type of subdirectory (such as DIRECTORY_MOVIES). If you don't need a specific media directory, pass null to receive the root directory of your app's private directory.
Probably, this would be the best practice.
Use this method to create folder
public static void appendLog(String text, String fileName) {
File sdCard=new File(Environment.getExternalStorageDirectory().getPath());
if(!sdCard.exists()){
sdCard.mkdirs();
}
File logFile = new File(sdCard, fileName + ".txt");
if (logFile.exists()) {
logFile.delete();
}
try {
logFile.createNewFile();
} catch (IOException e) {
e.printStackTrace();
}
try {
//BufferedWriter for performance, true to set append to file flag
BufferedWriter buf = new BufferedWriter(new FileWriter(logFile, true));
buf.write(text);
buf.newLine();
buf.close();
} catch (IOException e) {
e.printStackTrace();
}
}
In this method, you have to pass your data string as a first parameter and file name which you want to create as second parameter.
I want to retain some strings even when i clear my app data so i am using text files saved in sd card.
I am using sd card files to store myStrings and read them at run time. but each and every time readfile return null.
following is my code:
protected void writeToFile(String data, String fileName) {
String root_sd = Environment.getExternalStorageDirectory().toString();
File dir = new File(root_sd+"/"+"AntiVirusPref");
if(dir.mkdir())
{
File f=new File( dir.getAbsolutePath()+"/"+fileName);
if (f.exists()) {
f.delete();
}
if (!f.exists()) {
try {
f.createNewFile();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
else {
File f=new File( dir.getAbsolutePath()+"/"+fileName);
if (f.exists()) {
f.delete();
}
if (!f.exists()) {
try {
f.createNewFile();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
try {
OutputStreamWriter outputStreamWriter = new OutputStreamWriter(openFileOutput(fileName, Context.MODE_PRIVATE));
outputStreamWriter.write(data);
outputStreamWriter.close();
}
catch (IOException e) {
Log.e("Exception", "File write failed: " + e.toString());
}
}
protected String readFromFile(String fileName, String defaultValue) {
String ret = "";
String root_sd = Environment.getExternalStorageDirectory().toString();
File dir = new File(root_sd+"/"+"AntiVirusPref");
File file = new File(dir.getAbsolutePath() + "/"+fileName);
try {
//InputStream inputStream = openFileInput("/sdcard/"+fileName);
FileInputStream inputStream = new FileInputStream(file);
if ( inputStream != null ) {
InputStreamReader inputStreamReader = new InputStreamReader(inputStream);
BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
String receiveString = "";
StringBuilder stringBuilder = new StringBuilder();
/*if((receiveString = bufferedReader.read) != null){
stringBuilder.append(receiveString);
}*/
String line="";
int c;
while ((c = bufferedReader.read()) != -1) {
line+=(char)c;
//counter++;
}
stringBuilder.append(line);
inputStream.close();
ret = stringBuilder.toString();
}
}
catch (FileNotFoundException e) {
Log.e("login activity", "File not found: " + e.toString());
} catch (IOException e) {
Log.e("login activity", "Can not read file: " + e.toString());
}
if (ret.equals("")) {
ret=defaultValue;
}
return ret;
}
try to add the "file:///" suffix before the Uri
private void readFileFromSDCard() {
File directory = Environment.getExternalStorageDirectory();
File file = new File(directory+"/HomeActivityLogs");
//file.getParentFile().mkdirs();
if (!file.exists()) {
FileWriter gpxwriter;
try {
System.out.println(" IN TRY Error");
file.createNewFile();
gpxwriter = new FileWriter(file);
System.out.println(" file writer Error");
BufferedWriter out = new BufferedWriter(gpxwriter);
out.write("http://192.168.1.126/msfaws2_4/Service.asmx");
System.out.println(" in url Error");
/// out.write("http://192.168.1.250/msfaws2_4/Service.asmx");
out.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
loginLog.appendLog("Exception in readFileFromSDCard() " + e.getMessage(),"MainActivity");
}
}
BufferedReader reader = null;
try {
System.out.println("Error");
reader = new BufferedReader(new FileReader(file));
StringBuilder builder = new StringBuilder();
String line;
while ((line = reader.readLine()) != null) {
builder.append(line);
}
Constant.URL = builder.toString();
} catch (Exception e) {
e.printStackTrace();
} finally {
if (reader != null) {
try {
reader.close();
} catch (IOException e) {
e.printStackTrace();
loginLog.appendLog("Exception in readFileFromSDCard() " + e.getMessage(),"MainActivity");
}
}
}
}
Please help me to solve this. It gives an error filenotfound with the filename
it creates dynamically from the web services, when the data was stored temporary and then retrieved from the activity.
Try this, Add this permission in you manifest.xml
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />