Android 缓慢文件下载 vs iOS 和 Android黑莓 - DefaultHttpClient

发布于 2024-11-11 14:04:57 字数 1371 浏览 4 评论 0原文

我正在使用以下代码下载文件，我发现与 iOS 和 BlackBerry 上几乎相同的代码相比，性能确实非常慢。

除了在各种不同的 SDK 版本和 OSX 与 Windows 上进行测试之外，我还在各种设备上尝试了该应用程序 - HTC Desire、Samsung Galaxy、Huwei Pulse、HTC Wildfire - 与 iPhone 和 BlackBerry 设备相比，所有设备的性能都很糟糕。

请观看我制作的视频，以比较 3 个模拟器上的速度： Android vs. iOS 和 BlackBerry

这是 Android 代码：

FileOutputStream fos = null;
InputStream input = null;

try {   
fos = new FileOutputStream("XXXX");

        HttpClient httpclient = new DefaultHttpClient();
        HttpGet httpget = new HttpGet("XXXX");
        HttpResponse response = httpclient.execute(httpget);
        input = response.getEntity().getContent();    

byte[] buffer = new byte[8192];
int readBytes;
while (((readBytes = input.read(buffer, 0, buffer.length)) != -1)
&& !thePackage.getPackageStatus().equals(
PackageStatus.STATUS_CANCEL_DOWNLOAD)) {
fos.write(buffer, 0, readBytes);
}
} catch (IOException e) {
e.printStackTrace();
} finally {
if (fos != null) {
try {
fos.close();
} catch (IOException e) {
}
}

if (input != null) {
try {
input.close();
} catch (IOException e) {
}

    }
}

我尝试过 BufferedHttpEntity 和其他缓冲/线程策略，但是这个版本的代码是我们尝试过的所有不同选项中性能最好的。我已经运行了大量的代码分析，并且看不出在顶级函数和 Dalvik/Apache Harmony 中的本机代码之间浪费了太多时间。

任何想法都很棒，因为糟糕的性能使我们的应用程序几乎无法使用。

谢谢，

尼克

原文

I am using the following code to download files, and I am finding that the performance is really really slow compared with virtually the same code on iOS and BlackBerry.

As well as testing on various different SDK versions and OSX vs Windows, I have also tried the App on various devices - HTC Desire, Samsung Galaxy, Huwei Pulse, HTC Wildfire - all with terrible performance vs. iPhone and BlackBerry devices.

Check out this video I made to compare the speeds on the 3 emulators:
Android vs. iOS and BlackBerry

Here is the Android code:

FileOutputStream fos = null;
InputStream input = null;

try {   
fos = new FileOutputStream("XXXX");

        HttpClient httpclient = new DefaultHttpClient();
        HttpGet httpget = new HttpGet("XXXX");
        HttpResponse response = httpclient.execute(httpget);
        input = response.getEntity().getContent();    

byte[] buffer = new byte[8192];
int readBytes;
while (((readBytes = input.read(buffer, 0, buffer.length)) != -1)
&& !thePackage.getPackageStatus().equals(
PackageStatus.STATUS_CANCEL_DOWNLOAD)) {
fos.write(buffer, 0, readBytes);
}
} catch (IOException e) {
e.printStackTrace();
} finally {
if (fos != null) {
try {
fos.close();
} catch (IOException e) {
}
}

if (input != null) {
try {
input.close();
} catch (IOException e) {
}

    }
}

I've tried BufferedHttpEntity and other buffering/threading strategies, but this version of the code is the best performing out of any of the different options we've tried. I've run extensive code profiling, and can't see too much time being lost between the top level functions and the native code in Dalvik/Apache Harmony.

Any ideas would be fantastic, because the bad performance is making our application virtually unusable.

Thanks,

Nick

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入画浅相思 2024-11-18 14:04:57

android 文档指出 FileOutputStream 没有缓冲，应该包装在 BufferedOutputStream 中。

    OutputStream out = null;
    try {
        out = new BufferedOutputStream(new FileOutputStream("XXXX"));

        // write to out

    } finally {
        if (out != null) {
            out.close();
        }

    }

更多信息请访问 FileOutputStream

The android documentations states that the FileOutputStream is not buffered and should be wrapped in a BufferedOutputStream.

    OutputStream out = null;
    try {
        out = new BufferedOutputStream(new FileOutputStream("XXXX"));

        // write to out

    } finally {
        if (out != null) {
            out.close();
        }

    }

More info at FileOutputStream

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