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
onCreate(Bundle savedInstanceState)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
onCreateOptionsMenu(Menu menu)58     public boolean onCreateOptionsMenu(Menu menu) {
59         getMenuInflater().inflate(R.menu.main, menu);
60         return true;
61     }
62 
63     @Override
onOptionsItemSelected(MenuItem item)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 
startDownload()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
updateFromDownload(String result)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
getActiveNetworkInfo()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
finishDownloading()106     public void finishDownloading() {
107         mDownloading = false;
108         if (mNetworkFragment != null) {
109             mNetworkFragment.cancelDownload();
110         }
111     }
112 
113     @Override
onProgressUpdate(int progressCode, int percentComplete)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