[android help] can not open files with openFileInput saved via openFileOutput

Thread thread = new Thread() {

    @Override
    public void run() {
        try {
            saveDataFromWeb();// here i write data into a file
        } catch (Throwable e) {
            AlertDialog.Builder builder = new AlertDialog.Builder(
                    findViewById(R.id.viewpager).getContext());
            StringWriter sw = new StringWriter();
            PrintWriter pw = new PrintWriter(sw);
            e.printStackTrace(pw);
            sw.toString();
            builder.setMessage(sw.toString());
            AlertDialog alert = builder.create();
            alert.show();
        }
    }
};
if (CONDITION) {
    thread.start();
    parseData("ThisWeekDatabase"); // here I read the data from the 
    parseData("NextWeekDatabase");
}

I found the error. It is because the thread is not done with it's work (writing data from the web into files) when I try to read these files. Now I need a way to "wait" for the thread so it has finished writing the files when parseData(xyz) needs them.

also either the way I write the data into the file or the way I read the data from the files is wrong because I get one single long line when I read out of the files I have written in before instead of multiple short lines.

I get

div.lvsdrt {background-color:#e3f1ff; border-top:black 1px dotted;padding:0.1em;}div.lvwer{background-color:#f2f9ff;border-top:black 1px dotted;padding:0.1em;}div.nobreak {page-break-inside:avoid;}

instad of

div.lvsdrt {
    background-color:#e3f1ff;
    border-top:black 1px dotted;
    padding:0.1em;
}
div.lvwer {
    background-color:#f2f9ff;
    border-top:black 1px dotted;
    padding:0.1em;
}
div.nobreak {
    page-break-inside:avoid;
}

.

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