安卓下载大文件

Question

我试图从网络服务器下载一个大的 .zip 文件，但我有一个奇怪的行为，描述是:

• 我正在使用 512MB 的 SD 卡在 API 级别 3(版本 1.5)的设备模拟器中执行代码。我用“删除数据用户”启动设备
• conexion.getContentLength() 的大小长度为 7012725
• 服务器地址是 localhost (10.0.2.2)，但我已经尝试使用外部服务器并且行为相同。我已经仔细检查过我可以通过网络浏览器下载文件。
• 我在 list 文件中拥有这些权限:

-

<uses-permission android:name="android.permission.INTERNET"></uses-permission>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission>

错误:

• 它开始下载文件，我可以看到文本 10、20、30、40、50，然后在 60 处停止。
• 一段时间后，模拟器会自行重启。

解决方法:

• This stackoverflow 中的问题在设备中有效，但我的情况并非如此。

• 关于这个wifi锁issue我所做的是添加此权限“android.permission.WAKE_LOCK”，然后添加这段代码，但行为完全相同:

  WifiManager.WifiLock 无线锁；WifiManager 管理器 = (WifiManager) getSystemService(Context.WIFI_SERVICE);wifilock = manager.createWifiLock("wifilock");wifilock.acquire();...wifilock.release();

这是代码，它在一个单独的线程中执行:

private void downloadData(){
    try{
        Log.v(TAG, "downloading data");

        URL url  = new URL("http://10.0.2.2/1.zip");
        URLConnection connection = url.openConnection();
        connection.connect();

        int lenghtOfFile = connection.getContentLength();

        Log.v(TAG, "lenghtOfFile = "+lenghtOfFile);

        InputStream is = url.openStream();

        File testDirectory = new File(Environment.getExternalStorageDirectory()+"/testDirectory/");
    if(!testDirectory.exists()){
        testDirectory.mkdir();
    }

        FileOutputStream fos = new FileOutputStream(testDirectory+"/files.zip");

        byte data[] = new byte[1024];

        int count = 0;
        long total = 0;
        int progress = 0;

        while ((count=is.read(data)) != -1)
        {
            total += count;
            int progress_temp = (int)total*100/lenghtOfFile;
            if(progress_temp%10 == 0 && progress != progress_temp){
                progress = progress_temp;
                Log.v(TAG, "total = "+progress);    
            }
            fos.write(data, 0, count);
        }

        is.close();
        fos.close();

    Log.v(TAG, "downloading finished");

    }catch(Exception e){
        Log.v(TAG, "exception in downloadData");
        e.printStackTrace();
    }

}

有什么线索吗？非常感谢。

更新更多日志描述:

Hi Chris, I've tried to discover what was going on at first with this log in the Eclipse environment. Here are a little bit more detail about what is happening (time - action), note that I've changed the file to download for another one in orther to do more tests, but the results are quite the same:

00:00 It starts downloading:
V/iPhoto  (  853): downloading data
V/iPhoto  (  853): lenghtOfFile = 7732809
V/iPhoto  (  853): total = 10
V/iPhoto  (  853): total = 20
V/iPhoto  (  853): total = 30
V/iPhoto  (  853): total = 40
V/iPhoto  (  853): total = 50 (round 00:05)
-> Here it stops and the DDMS disconnects the device immediately

03:40 It finish the download (not always) and the device reboots on its own:
I/Process (  595): Sending signal. PID: 595 SIG: 3
I/dalvikvm(  595): threadid=7: reacting to signal 3
D/dalvikvm(  722): GC freed 2193 objects / 135808 bytes in 176 sec
V/iPhoto  (  853): total = 60
I/dalvikvm(  595): Wrote stack trace to '/data/anr/traces.txt'
I/ActivityManager(  595): Process com.google.android.apps.maps:FriendService (pid 778) has died.
I/ActivityManager(  595): Process com.android.mms (pid 732) has died.
V/iPhoto  (  853): total = 70
V/iPhoto  (  853): total = 80
V/iPhoto  (  853): total = 90
V/iPhoto  (  853): total = 100
V/iPhoto  (  853): downloading finished
V/iPhoto  (  853): thread finish loading
I/Process (  595): Sending signal. PID: 595 SIG: 9
I/ActivityThread(  757): Removing dead content provider: settings
I/ActivityThread(  748): Removing dead content provider: settings
I/ActivityThread(  722): Removing dead content provider: settings
I/ActivityThread(  700): Removing dead content provider: settings
I/ServiceManager(  549): service 'package' died
... services dying...
I/ServiceManager(  549): service 'wifi' died
E/installd(  557): eof
E/installd(  557): failed to read size
I/installd(  557): closing connection
D/qemud   (  560): fdhandler_event: disconnect on fd 11
D/qemud   (  560): fdhandler_event: disconnect on fd 12
E/vold    (  550): Framework disconnected
I/Zygote  (  554): Exit zygote because system server (595) has terminated
I/ServiceManager(  549): service 'simphonebook' died
I/ServiceManager(  549): service 'isms' died
I/ServiceManager(  549): service 'iphonesubinfo' died
I/ServiceManager(  549): service 'phone' died
D/AndroidRuntime(  949): 
D/AndroidRuntime(  949): >>>>>>>>>>>>>> AndroidRuntime START <<<<<<<<<<<<<<
... and starting ...

谁能试试我的代码并下载一个 8MB 大小的 zip 文件？它对你有用吗？

Answer 1

我刚刚在真实设备上试用了这段代码，它运行良好。模拟器中一定有什么奇怪的东西。