Runtime.getRuntime().exec("logcat -d") returns null - android

I'm trying to get the log of my app. Android 4.1.2 (Huawei tablet)
This is the code that I'm using
StringBuilder log=new StringBuilder();
try {
Process process = Runtime.getRuntime().exec("logcat -d");
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(process.getInputStream()));
String line;
while ((line = bufferedReader.readLine()) != null) {
log.append(line);
log.append(System.getProperty("line.separator"));
}
System.out.println(line == null);
} catch (IOException e) {
System.out.println("error");
e.printStackTrace();
}
I have added ther permissions to manifest
<uses-permission android:name="android.permission.READ_LOGS" />
When I try to read it bufferedReader is null and nothing is added to log variable.
EDIT:
I've founded this info
INFO
Apparently Huawei devices have service loggin disabled by default. I've tried the solution of the post but it doesn't work for me because "service loggin" option doesn't appears
Can someone help me?
Thanks


untime.getRuntime().exec(new String[]{"logcat", "-d"})

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StringBuilder log = new StringBuilder();
try{
Process process = Runtime.getRuntime().exec("logcat -d");
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(process.getInputStream()));
String line = "";
while (((line = bufferedReader.readLine()) != null) ) {
if(line.contains("<NAMEOFPACKAGEAPP>")) {
log.append(line);
log.append(System.getProperty("line.separator"));
}
}
} catch (IOException e) {
e.printStackTrace();
}

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BufferedReader bufferedReader = new BufferedReader(
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log.append(line);
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I am fetching android logs using logcat with following piece of program:
Process process=runtime.exec("logcat");
BufferedReader bufferedReader=new BufferedReader(new InputStreamReader(process.getInputStream()));
FileOutputStream fos=new FileOutputStream("/sdcard/Pictures/logs.txt");
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fos.write(line.getBytes());
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But the problem is it will fetch all logs at once and will write to the file.
However, I want to keep polling logcat for new logs and want to write the log to the file whenever there is a new log available.
Can you please suggest a way to do this ?

To fetch logcat
try {
Process process = Runtime.getRuntime().exec("logcat");
BufferedReader bufferedReader = new BufferedReader(
new InputStreamReader(process.getInputStream()));
StringBuilder log=new StringBuilder();
String line = "";
while ((line = bufferedReader.readLine()) != null) {
log.append(line);
}
TextView tv = (TextView)findViewById(R.id.textView1);
tv.setText(log.toString());
}
catch (IOException e) {}
make sure
you run this on a separate thread
apply filters to the log , as the output can be exhaustive
http://developer.android.com/tools/debugging/debugging-log.html#outputFormat

Try to add fos.flush(); into your while cycle.
Your cycle could appear like this:
while((line=bufferedReader.readLine())!=null){
fos.write(line.getBytes());
fos.flush();
}
It is untested solution, so let me know if it would not work.

Programmatically get log cat data

i want to get logcat data programmatically i used the below code
StringBuilder debuglog=new StringBuilder();
try {
Process process = Runtime.getRuntime().exec("logcat -d");
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(process.getInputStream()));
String line;
while ((line = bufferedReader.readLine()) != null) {
debuglog.append(line);
debuglog.append("\r\n");
}
} catch (IOException e) {
e.printStackTrace();
}
Above code is working fine
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To read logs.. I do something like,
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{
StringBuilder log = new StringBuilder();
try {
Process process = Runtime.getRuntime().exec("logcat -d");
BufferedReader bufferedReader = new BufferedReader(
new InputStreamReader(process.getInputStream()));
String line;
while ((line = bufferedReader.readLine()) != null) {
log.append(line);
}
} catch (IOException e) {
return null;
}
return log.toString();
}
In manifest file add this permission..
<uses-permission android:name="android.permission.READ_LOGS" />

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