Android的下载大型文件 [英] Android download large files

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本文介绍了Android的下载大型文件的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

我试图下载来自Web服务器的大型.zip文件,但我有一个怪异的行为,描述是:

  • 在我执行code在设备仿真器,API级别3(版本1.5)与512MB的SD卡。我开始将设备与擦除数据的用户
  • 尺寸从conexion.getContentLength()的长度为7012725
  • 在服务器地址为localhost(10.0.2.2),但我已经试过与外部服务器的行为是一样的。我已经双重检查,我可以通过网络浏览器下载文件。
  • 在我的这些permisions清单文件中:

-

 <使用-权限的Andr​​oid:名称=android.permission.INTERNET对>< /使用-许可>
<使用-权限的Andr​​oid:名称=android.permission.WRITE_EXTERNAL_STORAG​​E>< /使用-许可>
 

错误:

  • 它开始下载文件,我可以看到文本10,20,30,40,50,然后将其在60停止。
  • 在一段时间后,模拟器自动重启。

解决方法:

下面是code,即它是在执行一个单独的线程:

 私人无效downloadData(){
    尝试{
        Log.v(TAG,下载数据);

        网址URL =新的URL(http://10.0.2.2/1.zip);
        URLConnection的连接= url.openConnection();
        connection.connect();

        INT lenghtOfFile = connection.getContentLength();

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

        InputStream的是= url.openStream();

        文件testDirectory =新的文件(Environment.getExternalStorageDirectory()+/ testDirectory /);
    如果(!testDirectory.exists()){
        testDirectory.mkdir();
    }

        FileOutputStream中FOS =新的FileOutputStream(testDirectory +/ files.zip);

        字节的数据[] =新的字节[1024];

        诠释计数= 0;
        总长= 0;
        INT进度= 0;

        而((计数= is.​​read(数据))!=  -  1)
        {
            共有+ =计数;
            INT progress_temp =(int)的总* 100 / lenghtOfFile;
            如果(progress_temp%10 == 0安培;&安培;进步= progress_temp!){
                进度= progress_temp;
                Log.v(TAG,总=+进步);
            }
            fos.write(数据,0,计数);
        }

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

    Log.v(TAG,下载完毕);

    }赶上(例外五){
        Log.v(TAG,例外downloadData);
        e.printStackTrace();
    }

}
 

任何线索? 非常感谢你。

更新与更多的日志说明:

  

嗨克里斯,我试图发现什么   起初打算与此日志中   Eclipse环境。这里有   点点的细节是什么   发生(时间 - 作用),注意   我已经改变了,下载的文件   另一位在orther做多   测试,但结果是相当的   相同的:

  00:00将开始下载:
V / iPhoto中(853):将数据下载
V / iPhoto中(853):lenghtOfFile = 7732809
V / iPhoto中(853):总= 10
V / iPhoto中(853):总= 20
V / iPhoto中(853):总= 30
V / iPhoto中(853):总= 40
V / iPhoto中(853):总= 50(圆00:05)
 - >在这里,它停止和DDMS立即断开装置

03:40它完成下载(不总是)与设备重启自己:
I /处理(595):发送信号。 PID:595 SIG:3
I / dalvikvm(595):主题ID = 7:反应信号3
D / dalvikvm(722):GC释放2193的对象/ 176秒135808字节
V / iPhoto中(853):总= 60
I / dalvikvm(595):写堆栈跟踪/data/anr/traces.txt
I / ActivityManager(595):过程com.google.android.apps.maps:FriendService(PID 778)已经死亡。
I / ActivityManager(595):过程com.android.mms(PID 732)已经死亡。
V / iPhoto中(853):总= 70
V / iPhoto中(853):总= 80
V / iPhoto中(853):总= 90
V / iPhoto中(853):总= 100
V / iPhoto中(853):下载完成
V / iPhoto中(853):线程完成加载
I /处理(595):发送信号。 PID:595 SIG:9
I / ActivityThread(757):去除死皮内容提供商:设置
I / ActivityThread(748):去除死皮内容提供商:设置
I / ActivityThread(722):去除死皮内容提供商:设置
I / ActivityThread(700):去除死皮内容提供商:设置
我/的ServiceManager(549):服务一揽子去世
...服务奄奄一息......
我/的ServiceManager(549):服务无线去世
E / INSTALLD(557):EOF
E / INSTALLD(557):无法读取尺寸
I / INSTALLD(557):关闭连接
D / qemud(560):fdhandler_event:断开的FD 11
D / qemud(560):fdhandler_event:断开的FD 12
E / vold的(550):框架断开
I /合子(554):退出合子,因为系统服务器(595)已终止
我/的ServiceManager(549):服务simphonebook'死亡
我/的ServiceManager(549):服务'主义'死亡
我/的ServiceManager(549):服务iphonesubinfo'死亡
我/的ServiceManager(549):服务电话死了
D / AndroidRuntime(949):
D / AndroidRuntime(949):>>>>>>>>>>>>>> AndroidRuntime START<<<<<<<<<<<<<<
...并开始...
 

任何人都可以尽我的code和下载大小为8MB圆一个zip文件?它是否适合你?

解决方案

我只是想这code在真实的设备和它完美的作品。必须有在模拟器奇怪的事情。

I'm trying to download a large .zip file from a web server but I have a weird behaviour, the description is:

  • I'm executing the code in the device emulator, API level 3 (version 1.5) with an SD card of 512MB. I start the device with "Wipe data user"
  • The length of the size from conexion.getContentLength() is 7012725
  • The server address is localhost (10.0.2.2), but I've tried with an external server and the behaviour is the same. I've double checked that I can download the file through a web browser.
  • I have these permisions in the manifest file:

-

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

The error:

  • It starts downloading the file, I can see the text 10, 20, 30, 40, 50 and then it stops at 60.
  • After a while, the emulator reboots itself.

Workarounds:

  • This issue in stackoverflow is working in the device, not in my case.
  • About this wifi lock issue what I've done is add this permission "android.permission.WAKE_LOCK" and then this piece of code, but with exactly the same behaviour:

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

Here is the code, that it's being executing in a separate thread:

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();
    }

}

Any clue? Thank you very much.

Update with more log description:

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 ...

Could anyone try my code and to download a zip file with size round 8MB? Does it works for you?

解决方案

I've just tried this code in a real device and it works perfectly. There must be something weird in the emulator.

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