使用afinal下载文件并且在状态栏中显示下载的进度_移动开发_编程开发_程序员俱乐部

　　2013年10月23日，今天是在“我在找你信息服务有限公司”第一天上班，公司给提出了这样一个要求：下载本公司的app，并且在下载的过程中要在状态栏中显示下载的进度，并且，可以暂停和继续下载。

　　下面是我的代码实现：

　　MainActivity.java

  1 package com.yt.downloader;
  2 
  3 import java.io.File;
  4 
  5 import net.tsz.afinal.FinalHttp;
  6 import net.tsz.afinal.http.AjaxCallBack;
  7 
  8 import android.os.Bundle;
  9 import android.os.Environment;
 10 import android.os.Handler;
 11 import android.os.Message;
 12 import android.os.Vibrator;
 13 import android.annotation.SuppressLint;
 14 import android.app.Activity;
 15 import android.app.AlertDialog;
 16 import android.app.Notification;
 17 import android.app.NotificationManager;
 18 import android.content.Context;
 19 import android.content.DialogInterface;
 20 import android.util.Log;
 21 import android.view.Menu;
 22 import android.view.View;
 23 import android.view.View.OnClickListener;
 24 import android.widget.Button;
 25 import android.widget.EditText;
 26 import android.widget.RemoteViews;
 27 import android.widget.Toast;
 28 
 29 public class MainActivity extends Activity {
 30 
 31     public static final String TAG = "MainActivity";
 32 
 33     private EditText downloadUrlEt;
 34     private Button downloadBtn;
 35     private Button pauseBtn;
 36 
 37     private NotificationManager manager;
 38 
 39     private Notification notification;
 40 
 41     private AjaxCallBack<File> callBack;
 42 
 43     private RemoteViews contentView;
 44 
 45     private long progress;
 46     
 47     private boolean isPaused;
 48 
 49     private Message msg;
 50 
 51     @SuppressLint("HandlerLeak")
 52     private Handler handler = new Handler() {// 更改进度条的进度
 53 
 54         public void handleMessage(Message msg) {
 55 
 56             contentView.setProgressBar(R.id.pb, 100, (int) progress, false);
 57 
 58             notification.contentView = contentView;
 59 
 60             manager.notify(0, notification);
 61 
 62             super.handleMessage(msg);
 63 
 64         };
 65 
 66     };
 67 
 68     @Override
 69     protected void onCreate(Bundle savedInstanceState) {
 70         super.onCreate(savedInstanceState);
 71         setContentView(R.layout.activity_main);
 72         init();
 73     }
 74 
 75     /**
 76      * 初始化操作
 77      */
 78     public void init() {
 79         final Vibrator v = (Vibrator) getSystemService(Context.VIBRATOR_SERVICE);
 80         downloadUrlEt = (EditText) findViewById(R.id.url_et);
 81         downloadUrlEt.setText("http://mit.95195.com/singleonline.apk");
 82         downloadBtn = (Button) findViewById(R.id.downloadBtn);
 83         pauseBtn = (Button) findViewById(R.id.pauseBtn);
 84 
 85         downloadBtn.setOnClickListener(new OnClickListener() {
 86             @Override
 87             public void onClick(View view) {
 88                 String url = downloadUrlEt.getText().toString();
 89                 if (url.equals("") || url == null) {
 90                     v.vibrate(100);
 91                     Toast.makeText(MainActivity.this, "请输入正确的地址",
 92                             Toast.LENGTH_SHORT).show();
 93                     downloadUrlEt.setText("");
 94                     return;
 95                 }
 96 
 97                 download(url);
 98                 downloadBtn.setVisibility(View.GONE);
 99             }
100         });
101 
102         callBack = new AjaxCallBack<File>() {
103 
104             @Override
105             public void onFailure(Throwable t, int errorNo, String strMsg) {// 下载失败
106                 super.onFailure(t, errorNo, strMsg);
107                 Log.i(TAG, "下载失败..." + t.getStackTrace() + strMsg);
108 
109             }
110 
111             @Override
112             public void onStart() {// 开始下载
113                 super.onStart();
114                 Log.i(TAG, "开始下载...");
115                 sendNotification();
116             }
117 
118             @Override
119             public void onSuccess(File t) {// 下载成功
120                 super.onSuccess(t);
121                 Log.i(TAG, "下载完成...");
122                 manager.cancel(0);
123                 AlertDialog dialog = new AlertDialog.Builder(MainActivity.this).setTitle("下载完成该...").setPositiveButton("确定", new DialogInterface.OnClickListener() {
124                     
125                     @Override
126                     public void onClick(DialogInterface arg0, int arg1) {
127                         downloadBtn.setVisibility(View.GONE);
128                         pauseBtn.setVisibility(View.GONE);
129                     }
130                 }).create();
131             }
132 
133             @Override
134             public void onLoading(long count, long current) {// 正在下载
135                 super.onLoading(count, current);
136                 Log.i(TAG, "progress = " + progress);
137                 if (current != count && current != 0) {
138                     progress = (int) (current / (float) count * 100);
139                 } else {
140                     progress = 100;
141                 }
142                 handler.handleMessage(msg);
143             }
144 
145         };
146         
147         pauseBtn.setOnClickListener(new OnClickListener() {
148 
149             @Override
150             public void onClick(View view) {
151                 
152                 if(isPaused){
153                     isPaused = false;
154                     callBack.progress(true, (int)progress);
155                     pauseBtn.setText("暂停下载...");
156                 }else{
157                     callBack.progress(false, (int)progress);
158                     pauseBtn.setText("继续下载");
159                     isPaused = true;
160                 }
161                 
162             }
163         });
164         
165         manager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
166         notification = new Notification(R.drawable.ic_launcher, "下载进度条...",System.currentTimeMillis());
167         
168     }
169 
170     /**
171      * 判断SD卡是否可用
172      * 
173      * @return
174      */
175     public boolean isExternalStorageAvaliable() {
176 
177         String state = Environment.getExternalStorageState();
178 
179         if (Environment.MEDIA_MOUNTED.equals(state)) {
180             return true;
181         } else {
182             Toast.makeText(this, "未检测到SD卡...", Toast.LENGTH_SHORT).show();
183             return false;
184         }
185 
186     }
187 
188     /**
189      * 从指定的地址下载文件
190      * 
191      * @param url
192      *            下载地址
193      */
194     public void download(String url) {
195 
196         FinalHttp http = new FinalHttp();
197         if (!isExternalStorageAvaliable()) {
198             return;
199         }
200         String apkPath = Environment.getExternalStorageDirectory().getAbsolutePath() + "/single.apk";
201         File f = new File(apkPath);
202         if(f.exists()){
203             f.delete();
204         }
205         
206         http.download(url, apkPath, callBack);
207     }
208 
209     /**
210      * 发送通知
211      */
212     @SuppressWarnings("deprecation")
213     public void sendNotification() {
214         contentView = new RemoteViews(getPackageName(), R.layout.notify_view);
215         contentView.setProgressBar(R.id.pb, 100, 0, false);
216         notification.contentView = contentView;
217         manager.notify(0, notification);
218     }
219 
220     @Override
221     public boolean onCreateOptionsMenu(Menu menu) {
222         getMenuInflater().inflate(R.menu.main, menu);
223         return true;
224     }
225 
226     /**
227      * 当界面停止的时候取消下载
228      */
229     @Override
230     protected void onPause() {
231         manager.cancel(0);
232         super.onPause();
233     }
234 
235 }

activity_main.xml

 1 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
 2     xmlns:tools="http://schemas.android.com/tools"
 3     android:layout_width="match_parent"
 4     android:layout_height="match_parent"
 5     android:padding="10dp"
 6     tools:context=".MainActivity" >
 7 
 8     <TextView
 9         android:id="@+id/hint_tv"
10         android:layout_width="wrap_content"
11         android:layout_height="wrap_content"
12         android:paddingTop="10dp"
13         android:text="@string/tv_main_hint" />
14 
15     <EditText
16         android:id="@+id/url_et"
17         android:layout_width="match_parent"
18         android:layout_height="wrap_content"
19         android:layout_toRightOf="@id/hint_tv"
20         android:hint="@string/et_downloadurl"
21         android:singleLine="true" />
22 
23     <Button
24         android:id="@+id/downloadBtn"
25         android:layout_width="match_parent"
26         android:layout_height="wrap_content"
27         android:layout_below="@id/url_et"
28         android:paddingTop="20dp"
29         android:text="@string/str_download" />
30     
31      <Button
32          android:layout_below="@id/downloadBtn"
33         android:id="@+id/pauseBtn"
34         android:layout_width="match_parent"
35         android:layout_height="wrap_content"
36         android:paddingTop="20dp"
37         android:text="@string/btn_pause" />
38 
39 </RelativeLayout>

notify_view.xml

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
 3     android:layout_width="fill_parent"
 4     android:layout_height="fill_parent" >
 5 
 6     <ImageView
 7         android:id="@+id/notify_icon"
 8         android:layout_width="wrap_content"
 9         android:layout_height="wrap_content"
10         android:src="@drawable/ic_launcher" />
11 
12     <TextView
13         android:id="@+id/tv"
14         android:layout_width="wrap_content"
15         android:layout_height="wrap_content"
16         android:layout_toRightOf="@id/notify_icon"
17         android:singleLine="true"
18         android:text="下载进度..." />
19 
20     <ProgressBar
21         android:id="@+id/pb"
22         style="?android:attr/progressBarStyleHorizontal"
23         android:layout_width="match_parent"
24         android:layout_height="wrap_content"
25         android:layout_below="@id/tv"
26         android:layout_toRightOf="@id/notify_icon"
27         android:max="100"
28         android:paddingRight="10dp"
29         android:progress="50"
30         android:secondaryProgress="74"
31         android:visibility="visible" />
32 
33 </RelativeLayout>

代码下载地址：http://download.csdn.net/detail/yuan936845015/6444679