android-http HttpURLConnection

android-http HttpURLConnection

android-http/AndroidManifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="com.hmkcode.android.http">
+
+    <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>

android-http/java/com/hmkcode/android/http/MainActivity.java

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+  package com.hmkcode.android.http;
+
+import android.content.Context;
+import android.net.ConnectivityManager;
+import android.net.NetworkInfo;
+import android.os.AsyncTask;
+import android.support.v7.app.AppCompatActivity;
+import android.os.Bundle;
+import android.util.Log;
+import android.widget.TextView;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.net.HttpURLConnection;
+import java.net.URL;
+
+  public class MainActivity extends AppCompatActivity {
+
+    TextView tvIsConnected;
+    TextView tvResult;
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_main);
+        tvIsConnected = (TextView) findViewById(R.id.tvIsConnected);
+        tvResult = (TextView) findViewById(R.id.tvResult);
+        if(checkNetworkConnection())
+            // perform HTTP GET request
+            new HTTPAsyncTask().execute("http://hmkcode.com/examples/index.php");
+    }
+
+
+    // check network connection
+    public boolean checkNetworkConnection() {
+        ConnectivityManager connMgr = (ConnectivityManager)
+                getSystemService(Context.CONNECTIVITY_SERVICE);
+
+        NetworkInfo networkInfo = connMgr.getActiveNetworkInfo();
+        boolean isConnected = false;
+        if (networkInfo != null && (isConnected = networkInfo.isConnected())) {
+            // show "Connected" & type of network "WIFI or MOBILE"
+            tvIsConnected.setText("Connected "+networkInfo.getTypeName());
+            // change background color to red
+            tvIsConnected.setBackgroundColor(0xFF7CCC26);
+
+
+        } else {
+            // show "Not Connected"
+            tvIsConnected.setText("Not Connected");
+            // change background color to green
+            tvIsConnected.setBackgroundColor(0xFFFF0000);
+        }
+
+        return isConnected;
+    }
+
+  private class HTTPAsyncTask extends AsyncTask<String, Void, String> {
+      @Override
+      protected String doInBackground(String... urls) {
+
+          // params comes from the execute() call: params[0] is the url.
+          try {
+              return HttpGet(urls[0]);
+          } catch (IOException e) {
+              return "Unable to retrieve web page. URL may be invalid.";
+          }
+      }
+      // onPostExecute displays the results of the AsyncTask.
+      @Override
+      protected void onPostExecute(String result) {
+          tvResult.setText(result);
+      }
+  }
+
+  private String HttpGet(String myUrl) throws IOException {
+      InputStream inputStream = null;
+      String result = "";
+
+          URL url = new URL(myUrl);
+
+          // create HttpURLConnection
+          HttpURLConnection conn = (HttpURLConnection) url.openConnection();
+
+          // make GET request to the given URL
+          conn.connect();
+
+          // receive response as inputStream
+          inputStream = conn.getInputStream();
+
+          // convert inputstream to string
+          if(inputStream != null)
+              result = convertInputStreamToString(inputStream);
+          else
+              result = "Did not work!";
+
+      return result;
+  }
+
+      private static String convertInputStreamToString(InputStream inputStream) throws IOException{
+          BufferedReader bufferedReader = new BufferedReader( new InputStreamReader(inputStream));
+          String line = "";
+          String result = "";
+          while((line = bufferedReader.readLine()) != null)
+              result += line;
+
+          inputStream.close();
+          return result;
+
+      }
+
+
+  }

android-http/res/layout/activity_main.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout 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"
+    android:paddingBottom="@dimen/activity_vertical_margin"
+    android:paddingLeft="@dimen/activity_horizontal_margin"
+    android:paddingRight="@dimen/activity_horizontal_margin"
+    android:paddingTop="@dimen/activity_vertical_margin"
+    android:orientation="vertical"
+    tools:context="com.hmkcode.android.http.MainActivity">
+
+
+
+    <TextView
+        android:id="@+id/tvIsConnected"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="center"
+        android:background="#FF0000"
+        android:textColor="#FFF"
+        android:textSize="18dp"
+        android:padding="5dp"
+        android:layout_marginBottom="5dp"
+        android:text="is connected? " />
+
+    <TextView
+        android:id="@+id/tvResult"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="center"
+        android:background="#ffffff"
+        android:textColor="#000"
+        android:textSize="18dp"
+        android:padding="5dp"
+        android:layout_marginBottom="5dp"
+        android:text="" />
+</LinearLayout>

android-http/res/values-w820dp/dimens.xml

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+<resources>
+    <!-- Example customization of dimensions originally defined in res/values/dimens.xml
+         (such as screen margins) for screens with more than 820dp of available width. This
+         would include 7" and 10" devices in landscape (~960dp and ~1280dp respectively). -->
+    <dimen name="activity_horizontal_margin">64dp</dimen>
+</resources>

android-http/res/values/colors.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <color name="colorPrimary">#3F51B5</color>
+    <color name="colorPrimaryDark">#303F9F</color>
+    <color name="colorAccent">#FF4081</color>
+</resources>

android-http/res/values/dimens.xml

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+<resources>
+    <!-- Default screen margins, per the Android Design guidelines. -->
+    <dimen name="activity_horizontal_margin">16dp</dimen>
+    <dimen name="activity_vertical_margin">16dp</dimen>
+</resources>

android-http/res/values/strings.xml

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+<resources>
+    <string name="app_name">Android HTTP</string>
+</resources>

android-http/res/values/styles.xml

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+<resources>
+
+    <!-- Base application theme. -->
+    <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
+        <!-- Customize your theme here. -->
+        <item name="colorPrimary">@color/colorPrimary</item>
+        <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
+        <item name="colorAccent">@color/colorAccent</item>
+    </style>
+
+</resources>