我在写入文件时遇到了这个问题，我创建了文件，但它是空的。这是我使用的函数 - 我没有在logCat中得到任何错误，函数从头到尾执行没有任何问题，但文件是空的。任何人都可以帮助我并告诉我为什么这个文件是空的？
这是我使用的功能：
public void exportDataInCSV(final String file_name,
final ArrayList<Assessment> assessments, final boolean dropBox)
throws IOException {
final File folder = new File(Environment.getExternalStorageDirectory()
+ "/Psychology Assessment Exports");
boolean var = false;
if (!folder.exists())
var = folder.mkdir();
final String filename = folder.toString() + "/" + file_name + ".csv";
// show waiting screen
// CharSequence contentTitle = getString(R.string.app_name);
// final ProgressDialog progDailog = ProgressDialog.show(
// DataExport.this, contentTitle, "Exporting data...",
// true);// please
// // wait
try {
FileWriter fw = new FileWriter(filename);
fw.append("ChildID");
fw.append(',');
fw.append("ParentName");
fw.append(',');
fw.append("ChildName");
fw.append(',');
fw.append("ChildDOB");
fw.append(',');
fw.append("ChildGender");
fw.append(',');
fw.append("AssessmentID");
fw.append(',');
// AssessmentType DoctorName AssessmentDate Q1 Q2
fw.append("AssessmentType");
fw.append(',');
fw.append("DoctorName");
fw.append(',');
fw.append("AssessmentDate");
fw.append(',');
// tscyc start here
for (int n = 0; n < 90; n++) {
fw.append("Q" + (n + 1));
fw.append(',');
}
fw.append("R_RL");
fw.append(',');
fw.append("R_ATR");
fw.append(',');
fw.append("R_ANX");
fw.append(',');
fw.append("R_DEP");
fw.append(',');
fw.append("R_ANG");
fw.append(',');
fw.append("R_PTS-I");
fw.append(',');
fw.append("R_PTS-AV");
fw.append(',');
fw.append("R_PTS-AR");
fw.append(',');
fw.append("R_PTS-TOT");
fw.append(',');
fw.append("R_DIS");
fw.append(',');
fw.append("R_SC");
fw.append(',');
fw.append("RL");
fw.append(",");
fw.append("ATR");
fw.append(",");
fw.append("Anxiety");
fw.append(",");
fw.append("Depression");
fw.append(",");
fw.append("Anger");
fw.append(",");
fw.append("PTSD-Intrusion");
fw.append(",");
fw.append("PTSD-Avoidance");
fw.append(",");
fw.append("PTSD-Arousal");
fw.append(",");
fw.append("PTSD-Total");
fw.append(",");
fw.append("Dissociation");
fw.append(",");
fw.append("Sexual Concerns");
fw.append(",");
fw.append("Group");
fw.append('\n');
//
ChildRecord child;
int gender = -1;
db = new DatabaseHelper(DataExport.this);
db.openDB();
for (int i = 0; i < assessments.size(); i++) {
if (assessments.get(i).getQuestions().size() > 55) {
child = db.getChild(assessments.get(i).getChildID());
Log.v("--", child.getName());
fw.append(assessments.get(i).getChildID() + "");
fw.append(",");
fw.append(child.getParent1());
fw.append(",");
fw.append(child.getName());
fw.append(",");
fw.append(child.getDob());
fw.append(",");
gender = child.getGender();
switch (gender) {
case 1:
fw.append("Female");
break;
case 2:
fw.append("Male");
break;
}
fw.append(",");
fw.append(assessments.get(i).getId() + "");
fw.append(",");
fw.append("TSCYC");// edit later//add option for //
// types
fw.append(",");
fw.append(db.getDoctorNameById(assessments.get(i)
.getDoctorID()));
fw.append(",");
fw.append(assessments.get(i).getDate());
fw.append(",");
int RL = 0;
ArrayList<Question> questions = new ArrayList<Question>();
for (int n = 0; n < assessments.get(i).getQuestions()
.size(); n++) {
questions = assessments.get(i).getQuestions();
int answer = questions.get(n).getAnswer();
// if (answer == 1) {
// RL++;
// }
fw.append(answer + "");
fw.append(",");
}// 3, 14, 22, 53, 66, 73, 83, 86, and 89
int[] RLArray = { 2, 13, 21, 52, 65, 72, 82, 85, 88 };
for (int n = 0; n < RLArray.length; n++) {
if (questions.get(RLArray[n]).getAnswer() == 1) {
RL++;
}
}
Log.v("--", "1!");
fw.append(RL + "");
fw.append(",");
int ATR = questions.get(8).getAnswer()
+ questions.get(29).getAnswer()
+ questions.get(36).getAnswer()
+ questions.get(39).getAnswer()
+ questions.get(50).getAnswer()
+ questions.get(59).getAnswer()
+ questions.get(63).getAnswer()
+ questions.get(76).getAnswer()
+ questions.get(78).getAnswer();
fw.append(ATR + "");
fw.append(",");
// Q7+Q21+Q31+Q32+Q42+Q44+Q57+Q67+Q76
int anxiety = questions.get(6).getAnswer()
+ questions.get(20).getAnswer()
+ questions.get(30).getAnswer()
+ questions.get(31).getAnswer()
+ questions.get(41).getAnswer()
+ questions.get(43).getAnswer()
+ questions.get(56).getAnswer()
+ questions.get(66).getAnswer()
+ questions.get(75).getAnswer();
fw.append(anxiety + "");
fw.append(",");
// Q2+Q18+Q41+Q54+Q61+Q68+Q71+Q84+Q88
int depression = questions.get(1).getAnswer()
+ questions.get(17).getAnswer()
+ questions.get(40).getAnswer()
+ questions.get(53).getAnswer()
+ questions.get(60).getAnswer()
+ questions.get(67).getAnswer()
+ questions.get(70).getAnswer()
+ questions.get(83).getAnswer()
+ questions.get(87).getAnswer();
fw.append(depression + "");
fw.append(",");
// Q1+Q15+Q23+Q34+Q43+Q58+Q62+Q87+Q90
int anger = questions.get(0).getAnswer()
+ questions.get(14).getAnswer()
+ questions.get(22).getAnswer()
+ questions.get(33).getAnswer()
+ questions.get(42).getAnswer()
+ questions.get(57).getAnswer()
+ questions.get(61).getAnswer()
+ questions.get(86).getAnswer()
+ questions.get(89).getAnswer();
fw.append(anger + "");
fw.append(",");
// Q4+Q11+Q19+Q24+Q27+Q36+Q63+Q69+Q80
int intrusion = questions.get(3).getAnswer()
+ questions.get(10).getAnswer()
+ questions.get(18).getAnswer()
+ questions.get(23).getAnswer()
+ questions.get(26).getAnswer()
+ questions.get(35).getAnswer()
+ questions.get(62).getAnswer()
+ questions.get(68).getAnswer()
+ questions.get(79).getAnswer();
fw.append(intrusion + "");
fw.append(",");
// Q8+Q13+Q29+Q39+Q49+Q55+Q70+Q72+Q81
int avoidance = questions.get(7).getAnswer()
+ questions.get(12).getAnswer()
+ questions.get(28).getAnswer()
+ questions.get(38).getAnswer()
+ questions.get(48).getAnswer()
+ questions.get(54).getAnswer()
+ questions.get(69).getAnswer()
+ questions.get(71).getAnswer()
+ questions.get(80).getAnswer();
fw.append(avoidance + "");
fw.append(",");
// Q10+Q17+Q26+Q45+Q47+Q48+Q56+Q74+Q82
// Q10+Q17+Q26+Q45+Q47+Q48+Q56+Q74+Q82
Log.v("--", "2!");
int arousal = questions.get(9).getAnswer()
+ questions.get(16).getAnswer()
+ questions.get(25).getAnswer()
+ questions.get(44).getAnswer()
+ questions.get(46).getAnswer()
+ questions.get(47).getAnswer()
+ questions.get(55).getAnswer()
+ questions.get(73).getAnswer()
+ questions.get(81).getAnswer();
fw.append(arousal + "");
fw.append(",");
int total = intrusion + avoidance + arousal;
fw.append(total + "");
fw.append(",");
int dissociation = questions.get(4).getAnswer()
+ questions.get(24).getAnswer()
+ questions.get(27).getAnswer()
+ questions.get(32).getAnswer()
+ questions.get(37).getAnswer()
+ questions.get(45).getAnswer()
+ questions.get(51).getAnswer()
+ questions.get(77).getAnswer()
+ questions.get(84).getAnswer();
fw.append(dissociation + "");
fw.append(",");
// Q6+Q12+Q16+Q20+Q35+Q50+Q59+Q65+Q75
int sexualConcerns = questions.get(5).getAnswer()
+ questions.get(11).getAnswer()
+ questions.get(15).getAnswer()
+ questions.get(19).getAnswer()
+ questions.get(34).getAnswer()
+ questions.get(49).getAnswer()
+ questions.get(58).getAnswer()
+ questions.get(64).getAnswer()
+ questions.get(74).getAnswer();
fw.append(sexualConcerns + "");
fw.append(",");
if (!db.isDBOpen())
db.openDB();
int group = child.getGroup();
fw.append(db.getTscore(group, "RL", RL) + "");
fw.append(",");
fw.append(db.getTscore(group, "ATR", ATR) + "");
fw.append(",");
fw.append(db.getTscore(group, "ANX", anxiety) + "");
fw.append(",");
fw.append(db.getTscore(group, "DEP", depression) + "");
fw.append(",");
fw.append(db.getTscore(group, "ANG", anger) + "");
fw.append(",");
Log.v("--", "3!");
fw.append(db.getTscore(group, "PTS-I", intrusion) + "");
fw.append(",");
fw.append(db.getTscore(group, "PTS-AV", avoidance) + "");
fw.append(",");
fw.append(db.getTscore(group, "PTS-AR", arousal) + "");
fw.append(",");
fw.append(db.getTscore(group, "PTS-TOT", total) + "");
fw.append(",");
fw.append(db.getTscore(group, "DIS", dissociation) + "");
fw.append(",");
fw.append(db.getTscore(group, "SC", sexualConcerns) + "");
fw.append(",");
Log.v("--", "4! "+ db.getTscore(group, "SC", sexualConcerns));
fw.append(group + "");
fw.append("\n");
// tscyc code ends here
Log.v("--", "TSCYC finish*");
}
db.closeDB();
}
fw.close();
} catch (Exception e) {
}
// progDailog.dismiss();
if (dropBox) {
if (!session.isLinked())
mDBApi.getSession().startAuthentication(DataExport.this);
fileToDropbox(file_name);
}
}