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Android, Parse Json Data From A Web Server And Display On Listview

I am trying to display JSON result from JSON url link. Currently when I load up, it display nothing, just blank page. This is the source where I got information about JSON. This is

Solution 1:

I happen to encounter similar problem. Here is the code that help me find resolution. Hope this will help you.

activity_main.xml

<?xml version="1.0" encoding="utf-8"?><RelativeLayoutxmlns:android="http://schemas.android.com/apk/res/android"xmlns:tools="http://schemas.android.com/tools"android:layout_width="match_parent"android:layout_height="match_parent"android:paddingLeft="@dimen/activity_horizontal_margin"android:paddingRight="@dimen/activity_horizontal_margin"android:paddingTop="@dimen/activity_vertical_margin"android:paddingBottom="@dimen/activity_vertical_margin"tools:context=".MainActivity"><Buttonandroid:layout_width="wrap_content"android:layout_height="wrap_content"android:text="SEND GET REQUEST"android:id="@+id/sendGet"android:onClick="sendGetRequest"android:layout_alignParentStart="true" /><ScrollViewandroid:layout_width="wrap_content"android:layout_height="wrap_content"android:id="@+id/scrollView"android:layout_below="@+id/sendGet"android:layout_centerHorizontal="true"><TextViewandroid:layout_width="fill_parent"android:layout_height="wrap_content"android:text="Response ....."android:id="@+id/showOutput"android:layout_alignEnd="@+id/scrollView"android:layout_marginEnd="34dp" /></ScrollView></RelativeLayout>

MainActivity.java

import android.app.ProgressDialog;
import android.content.Context;
import android.net.Uri;
import android.os.AsyncTask;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.TextView;

import com.google.android.gms.appindexing.Action;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;

publicclassMainActivityextendsAppCompatActivity {

    private ProgressDialog progress;
    /**
     * ATTENTION: This was auto-generated to implement the App Indexing API.
     * See https://g.co/AppIndexing/AndroidStudio for more information.
     *///   private GoogleApiClient client;@OverrideprotectedvoidonCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        // 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();
    }

    publicvoidsendGetRequest(View View) {
        newGetClass(this).execute();
    }

    @OverridepublicvoidonStart() {
        super.onStart();

        // ATTENTION: This was auto-generated to implement the App Indexing API.// See https://g.co/AppIndexing/AndroidStudio for more information.//       client.connect();ActionviewAction= Action.newAction(
                Action.TYPE_VIEW, // TODO: choose an action type."Main Page", // TODO: Define a title for the content shown.// TODO: If you have web page content that matches this app activity's content,// make sure this auto-generated web page URL is correct.// Otherwise, set the URL to null.
                Uri.parse("http://host/path"),
                // TODO: Make sure this auto-generated app deep link URI is correct.
                Uri.parse("android-app://com.example.gunawardena.get_post_demo/http/host/path")
        );
 //       AppIndex.AppIndexApi.start(client, viewAction);
    }

    @OverridepublicvoidonStop() {
        super.onStop();

        // ATTENTION: This was auto-generated to implement the App Indexing API.// See https://g.co/AppIndexing/AndroidStudio for more information.ActionviewAction= Action.newAction(
                Action.TYPE_VIEW, // TODO: choose an action type."Main Page", // TODO: Define a title for the content shown.// TODO: If you have web page content that matches this app activity's content,// make sure this auto-generated web page URL is correct.// Otherwise, set the URL to null.
                Uri.parse("http://host/path"),
                // TODO: Make sure this auto-generated app deep link URI is correct.
                Uri.parse("android-app://com.example.gunawardena.get_post_demo/http/host/path")
        );
      //  AppIndex.AppIndexApi.end(client, viewAction);// client.disconnect();
    }

    privateclassGetClassextendsAsyncTask<String, Void, Void> {

        privatefinal Context context;

        publicGetClass(Context c) {
            this.context = c;
        }

        protectedvoidonPreExecute() {
            progress = newProgressDialog(this.context);
            progress.setMessage("Loading Get Method.....");
            progress.show();
        }

        @Overrideprotected Void doInBackground(String... params) {
            try {

                finalTextViewoutputView= (TextView) findViewById(R.id.showOutput);
                URLurl=newURL("https://dvlasearch.appspot.com/DvlaSearch?licencePlate=mt09nks&apikey=DvlaSearchDemoAccount");
                HttpURLConnectionconnection= (HttpURLConnection) url.openConnection();

                connection.setRequestMethod("GET");
                connection.setRequestProperty("USER-AGENT", "Mozilla/5.0");
                connection.setRequestProperty("ACCEPT-LANGUAGE", "en-US,en;0.5");

                intresponseCode= connection.getResponseCode();

                finalStringBuilderoutput=newStringBuilder("Request URL " + url);
                output.append(System.getProperty("line.separator") + "Response Code " + responseCode);
                output.append(System.getProperty("line.separator") + "Type " + "GET");
                BufferedReaderbr=newBufferedReader(newInputStreamReader(connection.getInputStream()));
                Stringline="";
                StringBuilderresponseOutput=newStringBuilder();
                System.out.println("output===============" + br);
                while ((line = br.readLine()) != null) {
                    responseOutput.append(line);
                }
                br.close();

                output.append(System.getProperty("line.separator") + "Response " + System.getProperty("line.separator") + System.getProperty("line.separator") + responseOutput.toString());

                MainActivity.this.runOnUiThread(newRunnable() {

                    @Overridepublicvoidrun() {
                        outputView.setText(output);
                        progress.dismiss();

                    }
                });

            } catch (MalformedURLException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            returnnull;
        }
    }
}

Output on the Emulator

enter image description here

HTH


References:

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