我从 Firebase 数据库获取 DataSnapshot 作为 JsonObject
。我必须将此 JsonObjec
t 转换为 JsonArray,然后将 JsonArray 转换为 Excel 格式,然后将该文件下载到移动存储中。我该怎么做?
在这里,我在单击按钮时获取 DataSnapshot
:
btnJson.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
databaseReference.addListenerForSingleValueEvent(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
long a = dataSnapshot.getChildrenCount();
System.out.println("lc" + a);
for (DataSnapshot ds : dataSnapshot.getChildren()) {
System.out.println("response1" + ds);
}
}
@Override
public void onCancelled(@NonNull DatabaseError databaseError) {
}
});
}
});
这是我在 jsonObject 中点击按钮时得到的响应:
{ key = 13uhnjvczw, value = {survey_title=Sports, questions={4={type=2, title=Who is the top goal scorer in La Liga?}, 0={options={0=13, 1=5}, type=1, title=How many ucl has real madrid won}, 1={options={0=Real Madrid fc, 1=Liverpool fc}, type=1, title=Who is the current UCL champion?}, 3={type=2, title=Who is the top goal scorer in UCL?}, 2={options={0=Cristiano Ronaldo, 1=Zinedine Zidane}, type=1, title=Who is the all time top scorer of Real Madrid?}}} }
最佳答案
public void saveCsv(JSONArray outerArray) throws IOException, JSONException {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
if (checkSelfPermission(android.Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, 1);
}
}
String fileName = referenceNo + " Result";
String rootPath = Environment.getExternalStorageDirectory().getAbsolutePath() + "/test/";
File dir = new File(rootPath);
if (!dir.exists()) {
dir.mkdir();
}
File file = null;
file = new File(rootPath, fileName);
if (!file.exists()) {
progressDialog.dismiss();
file.createNewFile();
}
if (file.exists()) {
progressDialog.dismiss();
CSVWriter writer = new CSVWriter(new FileWriter(file), ',');
for (int i = 0; i < outerArray.length(); i++) {
JSONArray innerJsonArray = (JSONArray) outerArray.getJSONArray(i);
arrayOfArrays[k] = stringArray1;
writer.writeNext(arrayOfArrays[k]);
System.out.println("aa " + Arrays.toString(arrayOfArrays[k]));
}
}
writer.close();
Toast.makeText(this, fileName + " is been saved at " + rootPath, Toast.LENGTH_LONG).show();
}
}
}
关于java - 将 FirebaseDatabase jsonObject 转换为 jsonArray,然后将 jsonArray 转换为 .xlsx 格式,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/57669585/