1. manisfests.xml
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<uses-permission android:name="android.permission.INTERNET"/>
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2.mainActivity.xml
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<RelativeLayout xmlns: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"
tools:context=".MainActivity">
<ProgressBar
android:id="@+id/progressBar"
style="?android:attr/progressBarStyleLarge"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:visibility="invisible" />
<ListView
android:id="@+id/listView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_alignParentTop="true" />
</RelativeLayout>
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3.activity_detail
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<RelativeLayout xmlns: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"
tools:context=".detail">
<TextView
android:id="@+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true" />
</RelativeLayout>
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4.MainActivity.java
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package com.arham.csdevbin.apidemo;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.ProgressBar;
import java.util.ArrayList;
import java.util.List;
public class MainActivity extends AppCompatActivity {
private ProgressBar pb;
private ListView lv;
private List<String> contactList;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
contactList = new ArrayList<>();
pb = (ProgressBar) findViewById(R.id.progressBar);
lv = (ListView) findViewById(R.id.listView);
/*fetch data from the web*/
Fetcher fetcher = new Fetcher();
fetcher.execute("https://newsapi.org/v2/top-headlines?sources=techcrunch&apiKey=
b63009d5896f4fe19251a328a69c1835");
lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
String name = (String) lv.getItemAtPosition(position);
Intent intent = new Intent(MainActivity.this, detail.class);
intent.putExtra("name", name);
startActivity(intent);
}
});
}
public void ContactAdapter(String json) {
contactList = JsonParser.Parse(json);
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_1, contactList);
lv.setAdapter(adapter);
}
//AsyncTask
private class Fetcher extends AsyncTask<String, String, String> {
@Override
protected void onPreExecute() {
pb.setVisibility(View.VISIBLE);
}
@Override
protected String doInBackground(String... params) {
String data = HttpManger.getData(params[0]);
return data;
}
@Override
protected void onPostExecute(String s) {
ContactAdapter(s);
pb.setVisibility(View.INVISIBLE);
}
}
}
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5.JsonParser.java
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package com.arham.csdevbin.apidemo;
import android.util.Log;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.util.ArrayList;
import java.util.List;
public class JsonParser {
public static List<String> Parse(String json) {
try {
JSONObject response = new JSONObject(json);
JSONArray articles = response.optJSONArray("articles");
List<String> contactList = new ArrayList<>();
for (int i = 0; i < articles.length(); i++) {
JSONObject article = articles.optJSONObject(i);
contactList.add(article.getString("title"));
}
return contactList;
} catch (JSONException e) {
e.printStackTrace();
return null;
}
}
}
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6.HttpManger.java
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package com.arham.csdevbin.apidemo;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
public class HttpManger {
public static String getData(String stringUrl) {
BufferedReader reader = null;
try {
URL url = new URL(stringUrl);
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
StringBuilder sb = new StringBuilder();
InputStreamReader is = new InputStreamReader(connection.getInputStream());
reader = new BufferedReader(is);
String line;
while ((line = reader.readLine()) != null) {
sb.append(line).append("\n");
}
return sb.toString();
} catch (Exception e) {
e.printStackTrace();
return null;
} finally {
try {
reader.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
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7.detail.java
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package com.arham.csdevbin.apidemo;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.widget.TextView;
public class detail extends AppCompatActivity {
TextView tv;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_detail);
tv = (TextView)findViewById(R.id.textView);
//store the text in variable
String name = getIntent().getExtras().getString("name");
//display text
tv.setText(name);
}
}
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