问题
I am developing an app that sync data from PHP server using volley library.I am receiving json array response from php. When response is little, it is working perfectly. But problem occurs when json is very large. I am using xaamp for sync. It is taking too much time to load the data. Sometimes not getting any data at all. I am preparing statement from json array of php and adding it to simple array list.
Am getting logcat error as :
36.713ms
W/art: Suspending all threads took: 7.657ms
I/art: Waiting for a blocking GC Alloc
W/art: Suspending all threads took: 85.126ms
W/art: Suspending all threads took: 40.203ms
I/art: Background partial concurrent mark sweep GC freed 541(18KB) AllocSpace objects, 33(130MB) LOS objects, 11% free, 123MB/139MB, paused 42.528ms total 557.827ms
I/art: WaitForGcToComplete blocked for 328.549ms for cause Alloc
I/art: Starting a blocking GC Alloc
W/art: Suspending all threads took: 5.369ms
I/art: Background sticky concurrent mark sweep GC freed 105(3KB) AllocSpace objects, 3(11MB) LOS objects, 0% free, 142MB/142MB, paused 7.807ms total 52.573ms
W/art: Suspending all threads took: 5.261ms
W/art: Suspending all threads took: 294.041ms
W/art: Suspending all threads took: 38.308ms
I/art: Background partial concurrent mark sweep GC freed 388(13KB) AllocSpace objects, 26(103MB) LOS objects, 10% free, 133MB/149MB, paused 40.009ms total 515.759ms
W/art: Suspending all threads took: 5.063ms
I/art: Background sticky concurrent mark sweep GC freed 157(5KB) AllocSpace objects, 3(11MB) LOS objects, 0% free, 150MB/150MB, paused 7.052ms total 34.742ms
I/art: Waiting for a blocking GC Alloc
W/art: Suspending all threads took: 129.556ms
I/art: Background partial concurrent mark sweep GC freed 494(16KB) AllocSpace objects, 36(142MB) LOS objects, 12% free, 110MB/126MB, paused 1.517ms total 672.880ms
I/art: WaitForGcToComplete blocked for 485.833ms for cause Alloc
I/art: Starting a blocking GC Alloc
W/art: Suspending all threads took: 13.120ms
I/art: Background sticky concurrent mark sweep GC freed 104(3KB) AllocSpace objects, 0(0B) LOS objects, 0% free, 138MB/138MB, paused 16.321ms total 38.525ms
W/art: Suspending all threads took: 9.983ms
W/art: Suspending all threads took: 285.230ms
W/art: Suspending all threads took: 38.702ms
I/art: Background partial concurrent mark sweep GC freed 435(14KB) AllocSpace objects, 27(106MB) LOS objects, 11% free, 127MB/143MB, paused 40.305ms total 493.740ms
W/art: Suspending all threads took: 5.107ms
I/art: Background sticky concurrent mark sweep GC freed 156(5KB) AllocSpace objects, 3(11MB) LOS objects, 0% free, 145MB/145MB, paused 6.856ms total 25.414ms
W/art: Suspending all threads took: 413.504ms
W/art: Suspending all threads took: 56.440ms
I/art: Background partial concurrent mark sweep GC freed 14(464B) AllocSpace objects, 9(35MB) LOS objects, 12% free, 115MB/131MB, paused 59.022ms total 496.519ms
I/art: Background sticky concurrent mark sweep GC freed 154(5KB) AllocSpace objects, 3(11MB) LOS objects, 0% free, 133MB/133MB, paused 5.741ms total 23.296ms
I/art: Waiting for a blocking GC Alloc
W/art: Suspending all threads took: 96.541ms
W/art: Suspending all threads took: 43.589ms
I/art: Background partial concurrent mark sweep GC freed 548(18KB) AllocSpace objects, 33(130MB) LOS objects, 11% free, 122MB/138MB, paused 45.755ms total 511.247ms
I/art: WaitForGcToComplete blocked for 332.277ms for cause Alloc
I/art: Starting a blocking GC Alloc
W/art: Suspending all threads took: 12.093ms
I/art: Background sticky concurrent mark sweep GC freed 104(3KB) AllocSpace objects, 0(0B) LOS objects, 0% free, 150MB/150MB, paused 15.972ms total 51.520ms
W/art: Suspending all threads took: 7.796ms
My json array is as following link. http://www.ktronsystem.com/data.json
my android code is
public void m461async(){
if (!(co.loggedInUserUniqid == "")) {
jdialog= new ProgressDialog(all.this);
jdialog.setMessage("m462 Please wait..We are processing your request.");
jdialog.setIndeterminate(false);
jdialog.setCancelable(false);
jdialog.show();
final Cursor mall = co.data_db.rawQuery("select * from mall", null);
mall.moveToFirst();
final int mrows = mall.getCount();
System.out.print(mrows+" ababababababababqa" );
for (int idx = 0; idx < mrows; idx++) {
System.out.print("loop of m462 55555555555555555555555");
mall.moveToPosition(idx);
mtempidx = idx;
final String mfilename = f1.getCol(mall, "filename").toLowerCase().trim();
String mfilepath = co.getDataPath(cn) + "/";
final String mfilefullname = mfilepath + mfilename;
if (new File(mfilefullname).exists()) {
StringRequest stringRequest= new StringRequest(Request.Method.POST, murl + "getonlinem461data.php",
new Response.Listener<String>() {
@Override
public void onResponse(final String response) {
mjay = mjay + 1;
System.out.println(mjay+ " m461111111111111111"+response);
class m461prepare extends AsyncTask<String, String, Integer> {
@Override
protected Integer doInBackground(String... params) {
msuccess=1;
System.out.println(mjay+" m46211111111111111"+response);
final String mquery="insert into m462 (accode,book,date,vno1,vno2,vno3,part,tot_debit,tot_credit,balance,cl_type,m462index) values ";
String mquery2="";
try {
System.out.print("zzzzzzzzzzzzzzzzzzzzzzzzzzz");
final SQLiteDatabase mdb1 =SQLiteDatabase.openDatabase(co.getDataPath(cn)+"/"+mfilename, null, SQLiteDatabase.OPEN_READWRITE);
mdb1.execSQL("delete from m462");
mdb1.close();
JSONArray arr = new JSONArray(response);
final ContentValues insertValues = new ContentValues();
System.out.print("xxxxxxxxxxxxxxxxxxxxxx");
if (arr.isNull(0)==false) {
System.out.print("ccccccccccccccccccccccccc");
for (int i = 0; i < arr.length(); i++) {
final JSONObject obj = (JSONObject) arr.get(i);
final String maccode = obj.get("maccode").toString();
final String mbook = obj.get("mbook").toString();
final String mdate = obj.get("mdate").toString();
final String mvno1 = obj.get("mvno1").toString();
final String mvno2 = obj.get("mvno2").toString();
final String mvno3 = obj.get("mvno3").toString();
final String mpart = obj.get("mpart").toString();
final String mtot_debit = obj.get("mtot_debit").toString();
final String mtot_credit = obj.get("mtot_credit").toString();
final String mbalance = obj.get("mbalance").toString();
final String mcl_type = obj.get("mcl_type").toString();
final String mm462index = obj.get("mm462index").toString();
mquery2 = mquery2
+ "('" + f1.abc(maccode) + "'," +
"'" + mbook + "'," +
"'" + mdate + "'," +
"'" + mvno1 + "'," +
"'" + mvno2 + "'," +
"'" + mvno3 + "'," +
"'" + mpart + "'," +
"'" + mtot_debit + "'," +
"'" + mtot_credit + "'," +
"'" + mbalance + "'," +
"'" + mcl_type + "'," +
"'" + mm462index + "'),";
}
System.out.print("vvvvvvvvvvvvvvvvvvvvvvv");
String mfinalquery = (mquery.trim() + mquery2.trim());
mfinalquery = mfinalquery.substring(0, mfinalquery.length() - 1);
ArrayQuery.add(mfinalquery);
ArrayFilename.add(mfilefullname);
}
} catch (JSONException e) {
e.printStackTrace();
}
System.out.print("bbbbbbbbbbbbbbbbbbbbbbb");
return 0;
}
@Override
protected void onPostExecute(Integer a){
System.out.print("nnnnnnnnnnnnnnnnnnnnnnnnnnnn");
if (mall.isLast()) {
System.out.println("333333333333");
jdialog.dismiss();
// trasync();
}
}
}
new m461prepare().execute();
}
},
new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
merror=1;
jdialog.dismiss();
f1.wait_wind("Please check your internet connection", cn);
}
}) {
@Override
protected Map<String, String> getParams() throws AuthFailureError {
Map<String, String> params = new HashMap<>();
params.put("uniqid_guid", co.loggedInUserUniqid);
params.put("filename", mfilename);
return params;
}
};
stringRequest.setRetryPolicy(new DefaultRetryPolicy(999999999, -1, DefaultRetryPolicy.DEFAULT_BACKOFF_MULT));
AppController.getInstance().addToRequestQueue(stringRequest,"m462_req");
}
}
mall.close();
}
else{
f1.wait_wind("Please login first !",cn);
}
}
thanks in advance.
回答1:
If the length of file is large, you should run this method on background. try this code :
@Override
public void onResponse(String response) {
new Thread(new Runnable() {
@Override
public void run() {
JSONArray arr = new JSONArray(response);
int len = arr.length();
for (int i = 0; i < len; i++) {
//write your parsing logic here
}
}
}).start();
}
来源：https://stackoverflow.com/questions/41520188/taking-too-much-time-to-get-large-json-data-from-server-using-php-volley-library