在Android下載較大的文件

我有一個應用程序下載一個非常大的文件（超過50MB）。不幸的是，我收到了下載失敗的報告。在Android下載較大的文件

下面是一個這樣的故障的logcat，以java.net.SocketException: The operation timed out結尾。它之間有來自WifiMonitor的各種消息。我不知道如何解釋這些消息。

有什麼特別的，我應該做下載一個大文件，或者這只是一個連接問題？

09-02 16:41:19.925 I/ActivityManager( 646): Displayed activity com.example/com.example.sp.MainActivity: 1110 ms (total 3786 ms) 
09-02 16:41:21.935 W/InputManagerService( 646): Window already focused, ignoring focus gain of: [email protected] 
09-02 16:41:23.495 I/global (7345): Default buffer size used in BufferedInputStream constructor. It would be better to be explicit if an 8k buffer is required. 
09-02 16:41:23.895 D/dalvikvm(7345): GC freed 5348 objects/307096 bytes in 160ms 
09-02 16:41:25.885 D/dalvikvm(7345): GC freed 15282 objects/713544 bytes in 124ms 
09-02 16:41:27.405 D/dalvikvm(7345): GC freed 11775 objects/524576 bytes in 131ms 
09-02 16:41:28.982 I/wpa_supplicant(7284): CTRL-EVENT-DISCONNECTED - Disconnect event - remove keys 
09-02 16:41:28.985 V/WifiMonitor( 646): Event [CTRL-EVENT-DISCONNECTED - Disconnect event - remove keys] 
09-02 16:41:28.985 V/WifiStateTracker( 646): New network state is DISCONNECTED 
09-02 16:41:28.985 I/wpa_supplicant(7284): CTRL-EVENT-STATE-CHANGE id=0 state=0 
09-02 16:41:28.985 V/WifiMonitor( 646): Event [CTRL-EVENT-STATE-CHANGE id=0 state=0] 
09-02 16:41:28.995 V/WifiStateTracker( 646): Changing supplicant state: COMPLETED ==> DISCONNECTED 
09-02 16:41:29.086 I/wpa_supplicant(7284): CTRL-EVENT-STATE-CHANGE id=0 state=2 
09-02 16:41:29.086 V/WifiMonitor( 646): Event [CTRL-EVENT-STATE-CHANGE id=0 state=2] 
09-02 16:41:29.086 V/WifiStateTracker( 646): Changing supplicant state: DISCONNECTED ==> SCANNING 
09-02 16:41:29.086 W/wpa_supplicant(7284): Failed to initiate AP scan. 
09-02 16:41:29.095 I/wpa_supplicant(7284): CTRL-EVENT-SCAN-RESULTS Ready 
09-02 16:41:29.095 I/wpa_supplicant(7284): Trying to associate with 00:1c:f0:6e:2a:56 (SSID='WLANR' freq=2412 MHz) 
09-02 16:41:29.095 E/wpa_supplicant(7284): Set_key: Wrong Key 
09-02 16:41:29.095 E/wpa_supplicant(7284): Set_key: Wrong Key 
09-02 16:41:29.095 E/wpa_supplicant(7284): Set_key: Wrong Key 
09-02 16:41:29.095 E/wpa_supplicant(7284): Set_key: Wrong Key 
09-02 16:41:29.095 E/wpa_supplicant(7284): Set_key: Wrong Key 
09-02 16:41:29.095 I/wpa_supplicant(7284): CTRL-EVENT-STATE-CHANGE id=0 state=3 
09-02 16:41:29.105 V/WifiMonitor( 646): Event [Trying to associate with 00:1c:f0:6e:2a:56 (SSID='WLANR' freq=2412 MHz)] 
09-02 16:41:29.105 V/WifiMonitor( 646): Event [CTRL-EVENT-STATE-CHANGE id=0 state=3] 
09-02 16:41:29.125 V/WifiStateTracker( 646): Changing supplicant state: SCANNING ==> ASSOCIATING 
09-02 16:41:29.825 I/wpa_supplicant(7284): CTRL-EVENT-STATE-CHANGE id=0 state=4 
09-02 16:41:29.825 V/WifiMonitor( 646): Event [CTRL-EVENT-STATE-CHANGE id=0 state=4] 
09-02 16:41:29.825 V/WifiStateTracker( 646): Changing supplicant state: ASSOCIATING ==> ASSOCIATED 
09-02 16:41:29.825 I/wpa_supplicant(7284): Associated with 00:1c:f0:6e:2a:56 
09-02 16:41:29.825 I/wpa_supplicant(7284): CTRL-EVENT-STATE-CHANGE id=0 state=7 
09-02 16:41:29.825 I/wpa_supplicant(7284): CTRL-EVENT-CONNECTED - Connection to 00:1c:f0:6e:2a:56 completed (reauth) [id=0 id_str=] 
09-02 16:41:29.825 I/wpa_supplicant(7284): wpa_supplicant - IPC_EVENT_AUTH_SUCC 
09-02 16:41:29.825 V/WifiMonitor( 646): Event [Associated with 00:1c:f0:6e:2a:56] 
09-02 16:41:29.825 V/WifiMonitor( 646): Event [CTRL-EVENT-STATE-CHANGE id=0 state=7] 
09-02 16:41:29.845 V/WifiStateTracker( 646): Changing supplicant state: ASSOCIATED ==> COMPLETED 
09-02 16:41:29.855 V/WifiMonitor( 646): Event [CTRL-EVENT-CONNECTED - Connection to 00:1c:f0:6e:2a:56 completed (reauth) [id=0 id_str=]] 
09-02 16:41:29.855 V/WifiStateTracker( 646): New network state is CONNECTED 
09-02 16:41:29.865 D/WifiStateTracker( 646): Deconfiguring interface and stopping DHCP 
09-02 16:41:29.865 E/wpa_supplicant(7284): prepare_filter_struct: type=5 
09-02 16:41:29.945 E/FileUtils(7345): Download failed 
09-02 16:41:29.945 E/FileUtils(7345): java.net.SocketException: The operation timed out

來源

2010-09-02 hpique

當進入睡眠模式時，手機會從Wi-Fi斷開連接，我認爲這是原因？看看WifiManager's WifiLock to see how you can prevent it.

來源

2010-09-02 18:00:55 hanspeide

如果問題是睡眠模式，是不是應該使用getWindow（）。addFlags（WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON）來使用\t \t？是否真的有必要請求WifiLock下載大文件？ – hpique 2010-09-02 20:37:45

因爲這會燒燬電池，所以您不會希望保持屏幕不變。取而代之的是獲取WIFI鎖，讓服務/任務運行直到完成，然後釋放它。它最終沒有太多的代碼。 – 2010-09-24 12:29:02

在Android下載較大的文件

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