Android下载大文件

Question

我正在尝试从Web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:

• 我正在设备模拟器中执行代码,API级别3(版本1.5),SD卡为512MB.我用"擦除数据用户"启动设备
• conexion.getContentLength()的大小长度为7012725
• 服务器地址是localhost(10.0.2.2),但我尝试使用外部服务器,行为是相同的.我已经仔细检查过我可以通过网络浏览器下载文件.
• 我在清单文件中有这些权限:

-

<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,然后它停在60.
• 过了一会儿,模拟器重新启动.

解决方法:

• stackoverflow中的这个问题在设备中工作,而不是在我的情况下.

• 关于这个wifi锁定问题,我所做的是添加此权限"android.permission.WAKE_LOCK"然后这段代码,但具有完全相同的行为:

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

这是代码,它正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();
    }

}

任何线索？非常感谢你.

更新更多日志说明:

嗨,Chris,我试图在Eclipse环境中首先发现这个日志发生了什么.以下是有关正在发生的事情的更多细节(时间 - 动作),请注意我已经将文件更改为另一个文件以进行更多测试,但结果完全相同:

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 ...

任何人都可以尝试我的代码并下载大小为8MB的zip文件？它适合你吗？

Answer 1

我刚刚在真实设备中尝试了这段代码，它运行得很好。模拟器里肯定有什么奇怪的东西。