我从JSON获取x和y值并使用GraphView创建图表。如何将X轴实现为Dates.I我正在共享我的代码，请查看错误是什么？
这是我的代码：
import android.graphics.Color;
import android.icu.text.SimpleDateFormat;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.support.annotation.RequiresApi;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import org.w3c.dom.Text;
import android.app.Activity;
import android.app.ProgressDialog;
import android.os.AsyncTask;
import android.os.Bundle;
import android.view.View;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.ListAdapter;
import android.widget.SimpleAdapter;
import android.widget.Toast;
import android.view.Menu;
import android.view.MenuItem;
import com.google.android.gms.appindexing.Action;
import com.google.android.gms.appindexing.AppIndex;
import com.google.android.gms.appindexing.Thing;
import com.google.android.gms.common.api.GoogleApiClient;
import com.jjoe64.graphview.GraphView;
import com.jjoe64.graphview.Viewport;
import com.jjoe64.graphview.helper.DateAsXAxisLabelFormatter;
import com.jjoe64.graphview.helper.StaticLabelsFormatter;
import com.jjoe64.graphview.series.DataPoint;
import com.jjoe64.graphview.series.DataPointInterface;
import com.jjoe64.graphview.series.LineGraphSeries;
import com.jjoe64.graphview.series.OnDataPointTapListener;
import com.jjoe64.graphview.series.Series;
import java.security.Timestamp;
import java.sql.Time;
import java.text.ParseException;
import java.util.Collections;
import java.util.Comparator;
import java.util.Date;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.HashMap;
import java.util.ArrayList;
import java.lang.Double;
import java.util.Map;
import java.util.Random;
import garima.asynctask.library.HttpHandler;
import static com.example.garima.bitcoingraph.sortedHashMap.sortByValues;
public class MainActivity extends AppCompatActivity {
private static final String TAG = MainActivity.class.getSimpleName();
//URL to get JSON Array
private static String url = "https://api.blockchain.info/charts/market-price?format=json";
HashMap<String, String> valueslist;
//JSON Node Names
private static final String TAG_STATUS = "status";
private static final String TAG_NAME = "name";
private static final String TAG_UNIT = "unit";
private static final String TAG_PERIOD = "period";
private static final String TAG_DESCRIPTION = "description";
private LineGraphSeries<DataPoint> series;
//On the click of this Get Data Button we receive information from json
Button Btngetdata;
JSONArray user = null;
/**
* ATTENTION: This was auto-generated to implement the App Indexing API.
* See https://g.co/AppIndexing/AndroidStudio for more information.
*/
private GoogleApiClient client;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
GraphView graph = (GraphView) findViewById(R.id.graph);
series = new LineGraphSeries<DataPoint>();
graph.addSeries(series);
series.setThickness(8);
series.setDrawDataPoints(true);
series.setOnDataPointTapListener(new OnDataPointTapListener() {
@Override
public void onTap(Series series, DataPointInterface dataPoint) {
Toast.makeText(MainActivity.this,"On Data Point clicked:"+dataPoint, Toast.LENGTH_SHORT).show();
}
});
//StaticLabelsFormatter staticLabelsFormatter = new StaticLabelsFormatter(graph);
//staticLabelsFormatter.setHorizontalLabels(new String[] { "Feb'16", "Mar'16","April'16","May'16","June'16","July'16","Aug'16","Sep'16","Oct'16","Nov'16","Dec'16","Jan'17"});
//graph.getGridLabelRenderer().setLabelFormatter(staticLabelsFormatter);
graph.getGridLabelRenderer().setLabelFormatter(new DateAsXAxisLabelFormatter(MainActivity.this));
//graph.getGridLabelRenderer().setNumHorizontalLabels(30); // only 4 because of the space
graph.getGridLabelRenderer().setHumanRounding(false);
Viewport viewport = graph.getViewport();
viewport.setYAxisBoundsManual(true);
viewport.setMinY(0);
viewport.setMaxY(1200);
viewport.setScalable(true);
viewport.setScrollable(true);
viewport.setScalableY(true);
viewport.setScrollableY(true);
//viewport.setXAxisBoundsManual(true);
valueslist = new HashMap<>();
Btngetdata = (Button) findViewById(R.id.getdata);
Btngetdata.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
new JSONParse().execute();
}
});
// ATTENTION: This was auto-generated to implement the App Indexing API.
// See https://g.co/AppIndexing/AndroidStudio for more information.
client = new GoogleApiClient.Builder(this).addApi(AppIndex.API).build();
}
@RequiresApi(api = Build.VERSION_CODES.N)
private void addEntry(String Xax, String Yax) {
//int Xaxis_val = Integer.parseInt(Xax);
//Log.i(TAG, "addEntry: value of Xaxis val is" + Xaxis_val);
float Yaxis_val = Float.parseFloat(Yax);
Log.i(TAG, "addEntry: value of Y axis is " + Yaxis_val);
Date date= new Date();
SimpleDateFormat fmtOut = new SimpleDateFormat("dd/MM/yyyy");
try {
date=fmtOut.parse(Xax);
} catch (ParseException e) {
e.printStackTrace();
}
Log.i(TAG, "addEntry: date as x is"+date);
series.appendData(new DataPoint(date, Yaxis_val), true, 200);
}
/**
* ATTENTION: This was auto-generated to implement the App Indexing API.
* See https://g.co/AppIndexing/AndroidStudio for more information.
*/
public Action getIndexApiAction() {
Thing object = new Thing.Builder()
.setName("Main Page") // TODO: Define a title for the content shown.
// TODO: Make sure this auto-generated URL is correct.
.setUrl(Uri.parse("http://[ENTER-YOUR-URL-HERE]"))
.build();
return new Action.Builder(Action.TYPE_VIEW)
.setObject(object)
.setActionStatus(Action.STATUS_TYPE_COMPLETED)
.build();
}
@Override
public void onStart() {
super.onStart();
// ATTENTION: This was auto-generated to implement the App Indexing API.
// See https://g.co/AppIndexing/AndroidStudio for more information.
client.connect();
AppIndex.AppIndexApi.start(client, getIndexApiAction());
}
@Override
public void onStop() {
super.onStop();
// ATTENTION: This was auto-generated to implement the App Indexing API.
// See https://g.co/AppIndexing/AndroidStudio for more information.
AppIndex.AppIndexApi.end(client, getIndexApiAction());
client.disconnect();
}
private class JSONParse extends AsyncTask<Void, Void, Void> {
private ProgressDialog pDialog;
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(MainActivity.this);
pDialog.setMessage("Getting Data ...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
pDialog.show();
}
@Override
protected Void doInBackground(Void... arg0) {
HttpHandler sh = new HttpHandler();
// Making a request to url and getting response
String jsonStr = sh.makeServiceCall(url);
Log.e(TAG, "Response from url: " + jsonStr);
if (jsonStr != null) {
try {
JSONObject jsonObj = new JSONObject(jsonStr);
String Status_Value = jsonObj.getString(TAG_STATUS);
String Name_Value = jsonObj.getString(TAG_NAME);
String Unit_Value = jsonObj.getString(TAG_UNIT);
String Period_Value = jsonObj.getString(TAG_PERIOD);
String Description_Value = jsonObj.getString(TAG_DESCRIPTION);
// Getting JSON Array node
JSONArray values = jsonObj.getJSONArray("values");
// looping through All Values
for (int i = 0; i < values.length(); i++) {
JSONObject c = values.getJSONObject(i);
String x_val = c.getString("x");
String y_val = c.getString("y");
// tmp hash map for single value
HashMap<String, String> val = new HashMap<>();
// adding each child node to HashMap key => value
val.put("x", x_val);
val.put("y", y_val);
// adding values to values list
valueslist.put(x_val, y_val);
}
} catch (final JSONException e) {
Log.e(TAG, "Json parsing error: " + e.getMessage());
runOnUiThread(new Runnable() {
@Override
public void run() {
Toast.makeText(getApplicationContext(),
"Json parsing error: " + e.getMessage(),
Toast.LENGTH_LONG)
.show();
}
});
}
} else {
Log.e(TAG, "Couldn't get json from server.");
runOnUiThread(new Runnable() {
@Override
public void run() {
Toast.makeText(getApplicationContext(),
"Couldn't get json from server. Check LogCat for possible errors!",
Toast.LENGTH_LONG)
.show();
}
});
}
return null;
}
@RequiresApi(api = Build.VERSION_CODES.N)
@Override
protected void onPostExecute(Void Result) {
pDialog.dismiss();
/* ListAdapter adapter = new SimpleAdapter(
MainActivity.this, valueslist,
R.layout.list_item, new String[]{"x", "y",
}, new int[]{R.id.x_var,
R.id.y_var});
lv.setAdapter(adapter); */
Log.i(TAG, "onPostExecute: value of list is" + valueslist);
ArrayList<String> xVals = new ArrayList<>();
/*ArrayList<Entry> yVals = new ArrayList<Entry>();
/*for(Map<String,String> map:valueslist){
String tagName = map.get(TAG_VALUEx);
Log.i(TAG, "onPostExecute: value is"+ tagName);
String tagNameY=map.get(TAG_VALUEy);
Log.i(TAG, "onPostExecute: value of y is"+tagNameY);
addEntry(tagName,tagNameY);
}*/
HashMap<String,String> sortedList=sortByValues(valueslist);
Log.i(TAG,"sorted hash map is "+sortedList);
for (Map.Entry<String, String> entry : sortedList.entrySet()) {
System.out.println(entry.getKey() + " " + entry.getValue());
String tagName = entry.getKey();
long timestampString = Long.parseLong(tagName);
String value = new java.text.SimpleDateFormat("dd/MM/yyyy").
format(new java.util.Date(timestampString * 1000));
/*// String newval=value.substring(0, value.indexOf(' '));
Date date= new Date();
SimpleDateFormat fmtOut = new SimpleDateFormat("dd/MM/yyyy");
try {
date=fmtOut.parse(value);
} catch (ParseException e) {
e.printStackTrace();
}*/
String tagNameY=entry.getValue();
//Log.i(TAG, "onPostExecute: value of date is"+date);
addEntry(value,tagNameY);
}
}
}
}
这是错误：
I/MainActivity: addEntry: date as x isTue Jan 03 00:00:00 GMT+01:00 2017
I/System.out: 1483488000 1126.7633375
I/MainActivity: addEntry: value of Y axis is 1126.7633
I/MainActivity: addEntry: date as x isWed Jan 04 00:00:00 GMT+01:00 2017
I/System.out: 1454457600 368.38
I/MainActivity: addEntry: value of Y axis is 368.38
I/MainActivity: addEntry: date as x isWed Feb 03 00:00:00 GMT+01:00 2016
D/AndroidRuntime: Shutting down VM
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.garima.bitcoingraph, PID: 3095
java.lang.IllegalArgumentException: new x-value must be greater then the last value. x-values has to be ordered in ASC.
at com.jjoe64.graphview.series.BaseSeries.checkValueOrder(BaseSeries.java:486)
at com.jjoe64.graphview.series.BaseSeries.appendData(BaseSeries.java:408)
at com.jjoe64.graphview.series.LineGraphSeries.appendData(LineGraphSeries.java:646)
at com.jjoe64.graphview.series.BaseSeries.appendData(BaseSeries.java:464)
at com.example.garima.bitcoingraph.MainActivity.addEntry(MainActivity.java:177)
at com.example.garima.bitcoingraph.MainActivity.-wrap0(MainActivity.java)
at com.example.garima.bitcoingraph.MainActivity$JSONParse.onPostExecute(MainActivity.java:361)
at com.example.garima.bitcoingraph.MainActivity$JSONParse.onPostExecute(MainActivity.java:312)
at android.os.AsyncTask.finish(AsyncTask.java:660)
at android.os.AsyncTask.-wrap1(AsyncTask.java)
at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:677)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6077)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755)
Application terminated.
答案 0 :(得分：0)
java.lang.IllegalArgumentException：新的x值必须大于 最后一个值。必须在ASC中订购x值。
我认为您必须在上升模式下订购日期，然后添加到DataPoint系列。
对不起，如果我的英语不好。