Faraz Fazli - Networking in Android

.gitignore

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+*.iml
+.gradle
+/local.properties
+/.idea/workspace.xml
+/.idea/libraries
+.DS_Store
+/build
+/captures

app/.gitignore

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+/build

app/build.gradle

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+apply plugin: 'com.android.application'
+
+android {
+    compileSdkVersion 23
+    buildToolsVersion "23.0.2"
+
+    defaultConfig {
+        applicationId "com.farazfazli.walmartassist"
+        minSdkVersion 16
+        targetSdkVersion 23
+        versionCode 1
+        versionName "1.0"
+    }
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
+        }
+    }
+}
+
+dependencies {
+    compile fileTree(dir: 'libs', include: ['*.jar'])
+    testCompile 'junit:junit:4.12'
+    compile 'com.android.support:appcompat-v7:23.1.1'
+}

app/proguard-rules.pro

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+# Add project specific ProGuard rules here.
+# By default, the flags in this file are appended to flags specified
+# in /Users/faraz/Library/Android/sdk/tools/proguard/proguard-android.txt
+# You can edit the include path and order by changing the proguardFiles
+# directive in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# Add any project specific keep options here:
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}

app/src/androidTest/java/com/farazfazli/walmartassist/ApplicationTest.java

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+package com.farazfazli.walmartassist;
+
+import android.app.Application;
+import android.test.ApplicationTestCase;
+
+/**
+ * <a href="http://d.android.com/tools/testing/testing_android.html">Testing Fundamentals</a>
+ */
+public class ApplicationTest extends ApplicationTestCase<Application> {
+    public ApplicationTest() {
+        super(Application.class);
+    }
+}

app/src/main/AndroidManifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<manifest package="com.farazfazli.walmartassist"
+          xmlns:android="http://schemas.android.com/apk/res/android">
+
+    <uses-permission android:name="android.permission.INTERNET"/>
+    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
+
+    <application
+        android:allowBackup="true"
+        android:icon="@mipmap/ic_launcher"
+        android:label="@string/app_name"
+        android:supportsRtl="true"
+        android:theme="@style/AppTheme">
+        <activity android:name=".MainActivity">
+
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN"/>
+
+                <category android:name="android.intent.category.LAUNCHER"/>
+            </intent-filter>
+        </activity>
+    </application>
+
+</manifest>

app/src/main/java/com/farazfazli/walmartassist/MainActivity.java

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+package com.farazfazli.walmartassist;
+
+import android.content.Context;
+import android.net.ConnectivityManager;
+import android.net.NetworkInfo;
+import android.os.AsyncTask;
+import android.os.Bundle;
+import android.support.v7.app.AppCompatActivity;
+import android.util.Log;
+import android.view.View;
+import android.widget.ArrayAdapter;
+import android.widget.Button;
+import android.widget.ListView;
+import android.widget.ProgressBar;
+import android.widget.Toast;
+
+import org.json.JSONArray;
+import org.json.JSONException;
+import org.json.JSONObject;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.net.HttpURLConnection;
+import java.net.MalformedURLException;
+import java.net.URL;
+import java.util.ArrayList;
+
+public class MainActivity extends AppCompatActivity {
+
+    private static final String TAG = "[" + MainActivity.class.getCanonicalName() + "]";
+
+    private static final String API_KEY = "INSERTAPIKEYHERE";
+    private static final String BASE_URL = "http://api.walmartlabs.com/v1/search?query=";
+    private static final String END_URL = "&format=json&apiKey=" + API_KEY;
+
+    private GrabWalmartJSONDataAsyncTask grabWalmartJSONDataAsyncTask;
+
+    private ArrayList<String> mItemsArrayList;
+    private ArrayAdapter<String> mArrayAdapter;
+
+    // API Call: BASE_URL + mQuery + END_URL
+
+    private String mQuery = "";
+    private String mResponse = "";
+
+    private ListView mItemsListView;
+    private ProgressBar mProgressBar;
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_main);
+        mItemsArrayList = new ArrayList<String>();
+        mArrayAdapter = new ArrayAdapter<>(this, android.R.layout.simple_list_item_1, mItemsArrayList);
+
+        mProgressBar = (ProgressBar) findViewById(R.id.progressBar);
+
+        mItemsListView = (ListView) findViewById(R.id.itemsListView);
+        mItemsListView.setAdapter(mArrayAdapter);
+
+        Button mCerealButton = (Button) findViewById(R.id.cereal);
+        Button mChocolateButton = (Button) findViewById(R.id.chocolate);
+        Button mTeaButton = (Button) findViewById(R.id.tea);
+
+
+        View.OnClickListener listener = new View.OnClickListener() {
+            @Override
+            public void onClick(View view) {
+                Log.i(TAG, "Tapped!");
+                mArrayAdapter.clear();
+                mQuery = ((Button) view).getText().toString();
+                ConnectivityManager connectivityManager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
+                NetworkInfo activeNetworkInfo = connectivityManager.getActiveNetworkInfo();
+                if (activeNetworkInfo != null && activeNetworkInfo.isConnected()) { // has internet
+                    if(grabWalmartJSONDataAsyncTask == null) { // first run
+                        grabWalmartJSONDataAsyncTask = new GrabWalmartJSONDataAsyncTask();
+                    }
+                    if(grabWalmartJSONDataAsyncTask.getStatus() != AsyncTask.Status.RUNNING) {
+                        grabWalmartJSONDataAsyncTask = new GrabWalmartJSONDataAsyncTask(); // must create another one
+                        grabWalmartJSONDataAsyncTask.execute();
+                    } else {
+                        Log.i(TAG, "Already running!");
+                        Toast.makeText(MainActivity.this, "Already running!", Toast.LENGTH_SHORT).show();
+                    }
+                } else {
+                    Log.i(TAG, "No internet!");
+                    Toast.makeText(MainActivity.this, "No internet!", Toast.LENGTH_SHORT).show();
+                }
+            }
+        };
+
+        mCerealButton.setOnClickListener(listener);
+        mChocolateButton.setOnClickListener(listener);
+        mTeaButton.setOnClickListener(listener);
+    }
+
+    private String getInputData(InputStream inputStream) throws IOException {
+        StringBuilder builder = new StringBuilder();
+        BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));
+
+        String body;
+        while ((body = reader.readLine()) != null) {
+            builder.append(body);
+        }
+
+        reader.close();
+
+        return builder.toString();
+    }
+
+    public class GrabWalmartJSONDataAsyncTask extends AsyncTask<Void, Void, Void> {
+
+        @Override
+        protected void onPreExecute() {
+            mItemsListView.setVisibility(View.INVISIBLE);
+            mProgressBar.setVisibility(View.VISIBLE);
+            super.onPreExecute();
+        }
+
+        @Override
+        protected Void doInBackground(Void... params) {
+            Log.i(TAG, "doInBackground started!");
+            try {
+                URL url = new URL(BASE_URL + mQuery + END_URL);
+                HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
+                urlConnection.connect();
+                InputStream inputStream = urlConnection.getInputStream();
+                mResponse = getInputData(inputStream);
+                convertResponseToJsonData(mResponse);
+            } catch (MalformedURLException e) {
+                e.printStackTrace();
+                Log.e(TAG, "MalformedURLException!");
+            } catch (IOException e) {
+                e.printStackTrace();
+                Log.e(TAG, "IOException!");
+            } catch (JSONException e) {
+                e.printStackTrace();
+                Log.e(TAG, "JSON Exception!");
+            }
+            return null;
+        }
+
+        @Override
+        protected void onPostExecute(Void aVoid) {
+            mItemsListView.setVisibility(View.VISIBLE);
+            mProgressBar.setVisibility(View.INVISIBLE);
+            Log.i(TAG, mItemsArrayList.toString());
+            mArrayAdapter.notifyDataSetChanged();
+            super.onPostExecute(aVoid);
+        }
+    }
+
+    private void convertResponseToJsonData(String response) throws JSONException {
+        JSONObject object = new JSONObject(response); // entire object
+        JSONArray array = object.getJSONArray("items"); // items array
+        for (int i = 0; i < array.length(); i++) {
+            JSONObject currentObject = array.getJSONObject(i);
+            String currentItem = currentObject.getString("name"); // specific item name
+            mItemsArrayList.add(currentItem);
+        }
+    }
+}