安卓OKHTTP 下载文件

最新推荐文章于 2025-05-08 14:05:26 发布

原创最新推荐文章于 2025-05-08 14:05:26 发布 · 3.4k 阅读

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CC 4.0 BY-SA版权

本文介绍了一个基于OkHttp的下载工具类实现，包括单例模式的类设计、下载方法的参数说明及异常处理，同时提供了下载监听接口，用于实时更新下载进度。通过示例展示了如何使用该工具类进行文件下载，并在下载完成后执行相关操作。

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compile 'com.squareup.okhttp3:okhttp:3.3.1'

工具类
public class DownloadUtil {
    private static DownloadUtil downloadUtil;
    private final OkHttpClient okHttpClient;

    public static DownloadUtil get() {
        if (downloadUtil == null) {
            downloadUtil = new DownloadUtil();
        }
        return downloadUtil;
    }

    private DownloadUtil() {
        okHttpClient = new OkHttpClient();
    }

    /**
     * @param url          下载连接
     * @param destFileDir  下载的文件储存目录
     * @param destFileName 下载文件名称
     * @param listener     下载监听
     */
    public void download(final String url, final String destFileDir, final String destFileName, final OnDownloadListener listener) {
        Request request = new Request.Builder().url(url).build();
        okHttpClient.newCall(request).enqueue(new Callback() {
            @Override
            public void onFailure(Call call, IOException e) {
                // 下载失败监听回调
                listener.onDownloadFailed(e);
            }

            @Override
            public void onResponse(Call call, Response response) throws IOException {
                InputStream is = null;
                byte[] buf = new byte[2048];
                int len = 0;
                FileOutputStream fos = null;
                // 储存下载文件的目录
                File dir = new File(destFileDir);
                if (!dir.exists()) {
                    dir.mkdirs();
                }
                File file = new File(dir, destFileName);
                try {
                    is = response.body().byteStream();
                    long total = response.body().contentLength();
                    fos = new FileOutputStream(file);
                    long sum = 0;
                    while ((len = is.read(buf)) != -1) {
                        fos.write(buf, 0, len);
                        sum += len;
                        int progress = (int) (sum * 1.0f / total * 100);
                        // 下载中更新进度条
                        listener.onDownloading(progress);
                    }
                    fos.flush();
                    // 下载完成
                    listener.onDownloadSuccess(file);
                } catch (Exception e) {
                    listener.onDownloadFailed(e);
                } finally {
                    try {
                        if (is != null)
                            is.close();
                    } catch (IOException e) {
                    }
                    try {
                        if (fos != null)
                            fos.close();
                    } catch (IOException e) {
                    }
                }
            }
        });
    }

    public interface OnDownloadListener {
        /**
         * @param file 下载成功后的文件
         */
        void onDownloadSuccess(File file);

        /**
         * @param progress 下载进度
         */
        void onDownloading(int progress);

        /**
         * @param e 下载异常信息
         */
        void onDownloadFailed(Exception e);
    }
}

使用方法

DownloadUtil.get().download(url, Environment.getExternalStorageDirectory().getAbsolutePath(), "kuoke.apk", new DownloadUtil.OnDownloadListener() {
    @Override
    public void onDownloadSuccess(File file) {
        //下载完成进行相关逻辑操作
        openFile(file);
    }
    @Override
    public void onDownloading(int progress) {
        progressBar.setProgress(progress);
        tv.setText("下载百分之"+progress+"%。。。。");
    }

    @Override
    public void onDownloadFailed(Exception e) {
        //下载异常进行相关提示操作
    }
});

private void openFile(final File file) { // TODO Auto-generated method stub if (file != null) { Intent intent = new Intent(); intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK); intent.setAction(Intent.ACTION_VIEW); intent.setDataAndType(Uri.fromFile(file), "application/vnd.android.package-archive"); startActivity(intent); new Handler().postDelayed(new Runnable() { @Override public void run() { if (file.exists()) file.delete(); finish(); } }, 10000); } else { Toast.makeText(this, "安装出错，请重新下载", Toast.LENGTH_SHORT).show(); } }