Home | History | Annotate | Download | only in networkconnect 
      1 /*
      2  * Copyright (C) 2016 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *     http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.example.android.networkconnect;
     18 
     19 import android.content.Context;
     20 import android.net.ConnectivityManager;
     21 import android.net.NetworkInfo;
     22 import android.os.Bundle;
     23 import android.support.v4.app.FragmentActivity;
     24 import android.util.Log;
     25 import android.view.Menu;
     26 import android.view.MenuItem;
     27 import android.widget.TextView;
     28 
     29 /**
     30  * Sample Activity demonstrating how to connect to the network and fetch raw
     31  * HTML. It uses a Fragment that encapsulates the network operations on an AsyncTask.
     32  *
     33  * This sample uses a TextView to display output.
     34  */
     35 public class MainActivity extends FragmentActivity implements DownloadCallback {
     36 
     37     // Reference to the TextView showing fetched data, so we can clear it with a button
     38     // as necessary.
     39     private TextView mDataText;
     40 
     41     // Keep a reference to the NetworkFragment which owns the AsyncTask object
     42     // that is used to execute network ops.
     43     private NetworkFragment mNetworkFragment;
     44 
     45     // Boolean telling us whether a download is in progress, so we don't trigger overlapping
     46     // downloads with consecutive button clicks.
     47     private boolean mDownloading = false;
     48 
     49     @Override
     50     protected void onCreate(Bundle savedInstanceState) {
     51         super.onCreate(savedInstanceState);
     52         setContentView(R.layout.sample_main);
     53         mDataText = (TextView) findViewById(R.id.data_text);
     54         mNetworkFragment = NetworkFragment.getInstance(getSupportFragmentManager(), "https://www.google.com");
     55     }
     56 
     57     @Override
     58     public boolean onCreateOptionsMenu(Menu menu) {
     59         getMenuInflater().inflate(R.menu.main, menu);
     60         return true;
     61     }
     62 
     63     @Override
     64     public boolean onOptionsItemSelected(MenuItem item) {
     65         switch (item.getItemId()) {
     66             // When the user clicks FETCH, fetch the first 500 characters of
     67             // raw HTML from www.google.com.
     68             case R.id.fetch_action:
     69                 startDownload();
     70                 return true;
     71             // Clear the text and cancel download.
     72             case R.id.clear_action:
     73                 finishDownloading();
     74                 mDataText.setText("");
     75                 return true;
     76         }
     77         return false;
     78     }
     79 
     80     private void startDownload() {
     81         if (!mDownloading && mNetworkFragment != null) {
     82             // Execute the async download.
     83             mNetworkFragment.startDownload();
     84             mDownloading = true;
     85         }
     86     }
     87 
     88     @Override
     89     public void updateFromDownload(String result) {
     90         if (result != null) {
     91             mDataText.setText(result);
     92         } else {
     93             mDataText.setText(getString(R.string.connection_error));
     94         }
     95     }
     96 
     97     @Override
     98     public NetworkInfo getActiveNetworkInfo() {
     99         ConnectivityManager connectivityManager =
    100                 (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
    101         NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo();
    102         return networkInfo;
    103     }
    104 
    105     @Override
    106     public void finishDownloading() {
    107         mDownloading = false;
    108         if (mNetworkFragment != null) {
    109             mNetworkFragment.cancelDownload();
    110         }
    111     }
    112 
    113     @Override
    114     public void onProgressUpdate(int progressCode, int percentComplete) {
    115         switch(progressCode) {
    116             // You can add UI behavior for progress updates here.
    117             case Progress.ERROR:
    118                 break;
    119             case Progress.CONNECT_SUCCESS:
    120                 break;
    121             case Progress.GET_INPUT_STREAM_SUCCESS:
    122                 break;
    123             case Progress.PROCESS_INPUT_STREAM_IN_PROGRESS:
    124                 mDataText.setText("" + percentComplete + "%");
    125                 break;
    126             case Progress.PROCESS_INPUT_STREAM_SUCCESS:
    127                 break;
    128         }
    129     }
    130 }
    131