CODEWITHSUNDEEP
androidandroid-5.0-lollipopfileoutputstream
Teja Nandamuri
Teja Nandamuri

Reputation: 11201

Appending to text file failed in Android

I am trying to create a simple text file, and I am successful in doing that by the following code:

                file=new File(mContext.getExternalFilesDir(null), generateFileName());
                fop=new FileOutputStream(file);
                timeString="Method executed in:"+formatTime(executionTime)+"secs";
                contentInBytes=timeString.getBytes();
                startString="start()".getBytes();
                stopString="stop()".getBytes();
                fop.write(startString);
                fop.write(System.getProperty("line.separator").getBytes());
                fop.write(contentInBytes);
                fop.write(System.getProperty("line.separator").getBytes());
                fop.write(stopString);
                fop.flush();
                fop.close();

                Log.d("write","Done writing.");

When I try to append same text to it again, the old text gets cleared out resulting in an empty text file.

This is how I tried to append the text:

        fOutA=new FileOutputStream(file);  //I also tried: new FileOutputStream(myFile,true);
        fOutA = mContext.openFileOutput(textFileName, mContext.MODE_APPEND);
        timeString="Method executed in:"+formatTime(executionTime)+"secs";
        contentInBytes=timeString.getBytes();
        startString="start()".getBytes();
        stopString="stop()".getBytes();
        fOutA.write(startString);
        fOutA.write(System.getProperty("line.separator").getBytes());
        fOutA.write(contentInBytes);
        fOutA.write(System.getProperty("line.separator").getBytes());
        fOutA.write(stopString);
        fOutA.flush();
        fOutA.close();
        Log.d("append","Done appending.");

The textfileName param in the append code-block is same as the generatedFileName() in write code-block.

Can someone tell me why it is happening ?

Upvotes: 0

Views: 41

Answers (2)

Teja Nandamuri
Teja Nandamuri

Reputation: 11201

Along with the suggestion given by Rahil2952, I need to get rid of this line:

  fOutA = mContext.openFileOutput(textFileName, mContext.MODE_APPEND);

I do not need the oneFileOutput and set its mode to MODE_APPEND. The FileOutputStream itself appends to the existing file when append is set to true .

Also I do not need to use OutputStreamWriter.

Upvotes: 0

baldguy
baldguy

Reputation: 2082

To write to file and append create instance of FileOutPutStream and OutPutStreamWriter and then use append method of OutputStreamWriter to append data to the file.

FileOutputStream fOut = new FileOutputStream(myFile,true);
OutputStreamWriter myOutWriter = new OutputStreamWriter(fOut,true);
myOutWriter.append()

Second argument means if text should be appended to the existing file or not.

Upvotes: 2

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