Rest Demo android app source code

<uses-permission android:name="android.permission.INTERNET" />   

 compile com.mcxiaoke.volley:library:1.0.+

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MainActivity.java

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package com.sam.web.restdemo;

import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

import android.text.method.ScrollingMovementMethod;

import android.util.Log;

import android.view.View;

import android.widget.Button;

import android.widget.EditText;

import android.widget.TextView;

import com.android.volley.RequestQueue;

import com.android.volley.VolleyError;

import com.android.volley.Response;

import com.android.volley.Request;

import com.android.volley.toolbox.JsonArrayRequest;

import com.android.volley.toolbox.Volley;

import org.json.JSONArray;

import org.json.JSONObject;

import org.json.JSONException;

public class MainActivity extends AppCompatActivity {

    EditText etGitHubUser; // This will be a reference to our GitHub username input.

    Button btnGetRepos;  // This is a reference to the "Get Repos" button.

    TextView tvRepoList;  // This will reference our repo list text box.

    RequestQueue requestQueue;  // This is our requests queue to process our HTTP requests.

    String baseUrl = "https://api.github.com/users/";  // This is the API base URL (GitHub API)

    String url;  // This will hold the full URL which will include the username entered in the etGitHubUser.

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        this.etGitHubUser = (EditText) findViewById(R.id.et_github_user);  // Link our github user text box.

        this.btnGetRepos = (Button) findViewById(R.id.btn_get_repos);  // Link our clicky button.

        this.tvRepoList = (TextView) findViewById(R.id.tv_repo_list);  // Link our repository list text output box.

        this.tvRepoList.setMovementMethod(new ScrollingMovementMethod());  // This makes our text box scrollable, for those big GitHub contributors with lots of repos :)

        requestQueue = Volley.newRequestQueue(this);  // This setups up a new request queue which we will need to make HTTP requests.

    }

    private void clearRepoList() {

        // This will clear the repo list (set it as a blank string).

        this.tvRepoList.setText("");

    }

    private void addToRepoList(String repoName, String lastUpdated) {

        // This will add a new repo to our list.

        // It combines the repoName and lastUpdated strings together.

        // And then adds them followed by a new line ( make two new lines).

        String strRow = repoName + " / " + lastUpdated;

        String currentText = tvRepoList.getText().toString();

        this.tvRepoList.setText(currentText + " " + strRow);

    }

    private void setRepoListText(String str) {

        // This is used for setting the text of our repo list box to a specific string.

        // We will use this to write a No repos found" message if the user doenst have any.

        this.tvRepoList.setText(str);

    }

    private void getRepoList(String username) {

        // First, we insert the username into the repo url.

        // The repo url is defined in GitHubs API docs (https://developer.github.com/v3/repos/).

        this.url = this.baseUrl + username + "/repos";

        // Next, we create a new JsonArrayRequest. This will use Volley to make a HTTP request

        // that expects a JSON Array Response.

        // To fully understand this, Id recommend readng the office docs: https://developer.android.com/training/volley/index.html

        JsonArrayRequest arrReq = new JsonArrayRequest(Request.Method.GET, url,

                new Response.Listener<JSONArray>() {

                    @Override

                    public void onResponse(JSONArray response) {

                        // Check the length of our response (to see if the user has any repos)

                        if (response.length() > 0) {

                            // The user does have repos, so lets loop through them all.

                            for (int i = 0; i < response.length(); i++) {

                                try {

                                    // For each repo, add a new line to our repo list.

                                    JSONObject jsonObj = response.getJSONObject(i);

                                    String repoName = jsonObj.get("name").toString();

                                    String lastUpdated = jsonObj.get("updated_at").toString();

                                    addToRepoList(repoName, lastUpdated);

                                } catch (JSONException e) {

                                    // If there is an error then output this to the logs.

                                    Log.e("Volley", "Invalid JSON Object.");

                                }

                            }

                        } else {

                            // The user didnt have any repos.

                            setRepoListText("No repos found.");

                        }

                    }

                },

                new Response.ErrorListener() {

                    @Override

                    public void onErrorResponse(VolleyError error) {

                        // If there a HTTP error then add a note to our repo list.

                        setRepoListText("Error while calling REST API");

                        Log.e("Volley", error.toString());

                    }

                }

        );

        // Add the request we just defined to our request queue.

        // The request queue will automatically handle the request as soon as it can.

        requestQueue.add(arrReq);

    }

    public void getReposClicked(View v) {

        // Clear the repo list (so we have a fresh screen to add to)

        clearRepoList();

        // Call our getRepoList() function that is defined above and pass in the

        // text which has been entered into the etGitHubUser text input field.

        getRepoList(etGitHubUser.getText().toString());

    }

}

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activity_main.xml

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<?xml version="1.0" encoding="utf-8"?>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:app="http://schemas.android.com/apk/res-auto"

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:paddingBottom="16dp"

    android:paddingTop="16dp"

    android:paddingLeft="16dp"

    android:paddingRight="16dp"

    tools:context="com.sam.web.restdemo.MainActivity">

    <EditText

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:inputType="textPersonName"

        android:hint="GitHub Username"

        android:text="LondonAppDev"

        android:ems="10"

        android:layout_alignParentTop="true"

        android:layout_alignParentLeft="true"

        android:layout_alignParentStart="true"

        android:id="@+id/et_github_user"

        android:layout_alignParentRight="true"

        android:layout_alignParentEnd="true" />

    <Button

        android:text="Get Repos"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_below="@+id/et_github_user"

        android:layout_alignParentLeft="true"

        android:layout_alignParentStart="true"

        android:id="@+id/btn_get_repos"

        android:layout_alignParentRight="true"

        android:layout_alignParentEnd="true"

        android:onClick="getReposClicked" />

    <TextView

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_below="@+id/btn_get_repos"

        android:layout_alignParentLeft="true"

        android:layout_alignParentStart="true"

        android:id="@+id/tv_repo_list"

        android:layout_alignParentBottom="true"

        android:layout_alignParentRight="true"

        android:scrollbars="vertical"

        android:layout_alignParentEnd="true" />

</RelativeLayout>