android-http HttpURLConnection

2016-06-15 21:30:18 +03:00
parent 68acc1ea04
commit c7498b54ce
18 changed files with 206 additions and 0 deletions
@@ -0,0 +1,114 @@
+  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;
+
+      }
+
+
+  }