Question

我想在我的应用程序中从互联网上下载视频。因此，我开始了一个新线程，在该线程中我启动了一个下载文件的服务。但是，它会在模拟器上抛出应用程序未响应对话框，但会在后台下载文件。我搜索了很多但找不到任何解决方案。请帮忙！

我的主题如下：

    Thread t = new Thread()
    {
        public void run()
        {
            Log.i("Test Log", "Starting Service");
            Intent intent = new Intent(MainActivity.this, DownloadService.class);
            startService(intent);
        }
    };
    t.start();

和服务片段如下：

try
     {
        Log.i("Test log", "Entered function");

        String RootDir = Environment.getExternalStorageDirectory() + File.separator + "Video";
        File RootFile = new File(RootDir);
        RootFile.mkdir();

        URL u = new URL(fileURL);
        HttpURLConnection c = (HttpURLConnection) u.openConnection();
        c.setRequestMethod("GET");
        c.setDoOutput(true);
        c.connect();

        long fileSize = c.getContentLength();
        Log.e("Test log", "File Size is: " +String.valueOf(fileSize));

        String downloadedFile = RootFile + "/Sample.mp4";
        Log.i("Test Log", downloadedFile);
        File df = new File(downloadedFile);

        if(fileSize == df.length())
        {
            Log.i("Test log", "File exists already! Did not download");
            stopSelf();
        }
        else
        {
            FileOutputStream f = new FileOutputStream(new File(RootFile, fileName));
            InputStream in = c.getInputStream();
            byte[] buffer = new byte[1024];

            int len1 = 0;
            while ((len1 = in.read(buffer)) > 0)
            {
                f.write(buffer, 0, len1);
            }
            f.close();

            Log.i("Test log", "Downloaded and file saved as "+downloadedFile);
            stopSelf();
        }
    }
    catch (Exception e)
    {
        Log.e("Catch exception", "Error is " +e.toString());
    }
}

编辑：以下是崩溃日志：

    06-14 17:32:32.638: E/ActivityManager(60): ANR in com.pranav.download
    06-14 17:32:32.638: E/ActivityManager(60): Reason: Executing service com.pranav.download/.DownloadService
    06-14 17:32:32.638: E/ActivityManager(60): Load: 0.49 / 0.21 / 0.17
    06-14 17:32:32.638: E/ActivityManager(60): CPU usage from 723800ms to 49ms ago:
    06-14 17:32:32.638: E/ActivityManager(60):   system_server: 5% = 4% user + 1% kernel /   faults: 3616 minor 2 major
    06-14 17:32:32.638: E/ActivityManager(60):   adbd: 1% = 0% user + 1% kernel / faults:  1593 minor
    06-14 17:32:32.638: E/ActivityManager(60):   qemud: 0% = 0% user + 0% kernel
    06-14 17:32:32.638: E/ActivityManager(60):   m.android.phone: 0% = 0% user + 0% kernel / faults: 18 minor
    06-14 17:32:32.638: E/ActivityManager(60):   ndroid.launcher: 0% = 0% user + 0% kernel / faults: 869 minor
    06-14 17:32:32.638: E/ActivityManager(60):   d.process.acore: 0% = 0% user + 0% kernel / faults: 1143 minor
    06-14 17:32:32.638: E/ActivityManager(60):   id.defcontainer: 0% = 0% user + 0% kernel / faults: 64 minor
    06-14 17:32:32.638: E/ActivityManager(60):   events/0: 0% = 0% user + 0% kernel
    06-14 17:32:32.638: E/ActivityManager(60):   com.svox.pico: 0% = 0% user + 0% kernel / faults: 28 minor
    06-14 17:32:32.638: E/ActivityManager(60):   rild: 0% = 0% user + 0% kernel
    06-14 17:32:32.638: E/ActivityManager(60):   logcat: 0% = 0% user + 0% kernel
    06-14 17:32:32.638: E/ActivityManager(60):   ndroid.settings: 0% = 0% user + 0% kernel / faults: 8 minor
    06-14 17:32:32.638: E/ActivityManager(60):   d.process.media: 0% = 0% user + 0% kernel / faults: 9 minor
    06-14 17:32:32.638: E/ActivityManager(60):   roid.alarmclock: 0% = 0% user + 0% kernel / faults: 7 minor
    06-14 17:32:32.638: E/ActivityManager(60):   com.android.mms: 0% = 0% user + 0% kernel / faults: 9 minor
    06-14 17:32:32.638: E/ActivityManager(60):   m.android.email: 0% = 0% user + 0% kernel / faults: 8 minor
    06-14 17:32:32.638: E/ActivityManager(60):   netd: 0% = 0% user + 0% kernel / faults: 4 minor
    06-14 17:32:32.638: E/ActivityManager(60):   ronsoft.openwnn: 0% = 0% user + 0% kernel / faults: 7 minor
    06-14 17:32:32.638: E/ActivityManager(60):   .quicksearchbox: 0% = 0% user + 0% kernel / faults: 8 minor
    06-14 17:32:32.638: E/ActivityManager(60):   android.protips: 0% = 0% user + 0% kernel / faults: 7 minor
   06-14 17:32:32.638: E/ActivityManager(60):   ackageinstaller: 0% = 0% user + 0% kernel / faults: 16 minor
   06-14 17:32:32.638: E/ActivityManager(60):   zygote: 0% = 0% user + 0% kernel / faults: 35 minor
   06-14 17:32:32.638: E/ActivityManager(60):   installd: 0% = 0% user + 0% kernel / faults: 3 minor
   06-14 17:32:32.638: E/ActivityManager(60):   m.android.music: 0% = 0% user + 0% kernel / faults: 7 minor
   06-14 17:32:32.638: E/ActivityManager(60):  +pranav.download: 0% = 0% user + 0% kernel
   06-14 17:32:32.638: E/ActivityManager(60):  +pranav.download: 0% = 0% user + 0% kernel
   06-14 17:32:32.638: E/ActivityManager(60): TOTAL: 14% = 6% user + 7% kernel + 0% irq + 0% softirq

Answer 1

使用async task handler ...这样主线程就不会被中断，下载会在后台进行......如果你需要一个例子......请告诉我..
使用此链接Async tasks

Answer 2

您可能已经从另一个线程启动了该服务，但它将在UI线程上运行代码。

在您的服务中，请使用doInBackground(...) AsyncTask方法下载视频代码。

new AsyncTask< Void, Void, Void >() {
    @Override
    protected Void doInBackground( final Void... params )
    {
        // Your download code
    }
}

应用程序在子线程中没有响应

2 个答案: