android设备出现更新apk失败问题

Question

应用程序检测到版本不一致时会跳更新页面，让用户点击更新操作，但是有些机器总是出现下载对话框是进度条不动，然后自动关闭进度条的现象。代码中使用简单的下载，代码如下：

public class UpdateService {

    private static OkHttpClient okHttpClient;

    public static void download(final String fileName,String url, final UpdateCallback callback) {
        Request request = new Request.Builder()
                .addHeader("Accept-Encoding", "identity")
                .url(url).build();

        if (okHttpClient == null) {
            okHttpClient = new OkHttpClient();
        }

        okHttpClient.newCall(request).enqueue(new Callback() {
            @Override
            public void onFailure(Call call, IOException e) {
                callback.onFailure();
            }

            @Override
            public void onResponse(Call call, Response response) throws IOException {
                if (response.body() == null) {
                    callback.onFailure();
                    return;
                }

                File filePath = new File(CommonConstants.DOWNLOAD_PATH);
                if (!filePath.exists()) {
                    filePath.mkdirs();
                }

                long contentLength = response.body().contentLength();
                byte[] buffer = new byte[1024];
                File file = new File(filePath.getCanonicalPath(), fileName);
                try (InputStream is = response.body().byteStream();
                     FileOutputStream fos = new FileOutputStream(file)) {
                     //Log.d("保存路径：" , file.getAbsolutePath());

                    int length;
                    long sum = 0;
                    while ((length = is.read(buffer)) != -1) {
                        fos.write(buffer, 0, length);
                        sum += length;
                        int progress = (int) (sum * 1.0f / contentLength * 100);
                        callback.onProgress(progress);
                    }
                    fos.flush();

                    callback.onSuccess();
                } catch (Exception e) {
                    callback.onFailure();
                }
            }
        });
    }

    public interface UpdateCallback {

        void onSuccess();

        void onProgress(int progress);

        void onFailure();
    }

}

业务中检测到不一致时执行如下代码：

UpdateService.download(fileName,apkUpdateUrl, new UpdateService.UpdateCallback() {
            @Override
            public void onSuccess() {
                dialog.dismiss();
                if (!Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
                    return;
                }

                File file = new File(CommonConstants.DOWNLOAD_PATH + fileName);
                try {
                   //下载成功好调用安装
                    installApk(file);
                } catch (Exception e) {
                    Log.e("获取打开方式错误", e.getMessage());
                }
            }

            @Override
            public void onProgress(int progress) {
                dialog.setProgress(progress);
            }

            @Override
            public void onFailure() {
                dialog.dismiss();
            }
        });

Answer 1

以下答案由GPT-3.5大模型与博主波罗歌共同编写：
这种情况可能是由于网络问题导致下载失败。你可以在下载的过程中添加一些额外的处理来排除一些可能的问题。

1. 检查网络连接状态：由于下载涉及到网络，所以应该首先检查设备的网络连接状态。可以使用ConnectivityManager类来获取设备的网络状态信息。

2. 设置下载超时：设定下载的超时时间，防止在下载文件时网络连接被中断而下载失败。

修改网络请求代码如下：

public static void download(final String fileName, String url, final UpdateCallback callback) {
    Request request = new Request.Builder()
        .addHeader("Accept-Encoding", "identity")
        .url(url)
        .build();

    if (okHttpClient == null) {
        okHttpClient = new OkHttpClient.Builder()
            .connectTimeout(10, TimeUnit.SECONDS)
            .readTimeout(10, TimeUnit.SECONDS)
            .writeTimeout(10, TimeUnit.SECONDS)
            .build();
    }

    okHttpClient.newCall(request).enqueue(new Callback() {
        @Override
        public void onFailure(Call call, IOException e) {
            callback.onFailure();
        }

        @Override
        public void onResponse(Call call, Response response) throws IOException {
            if (response.body() == null) {
                callback.onFailure();
                return;
            }

            File filePath = new File(CommonConstants.DOWNLOAD_PATH);
            if (!filePath.exists()) {
                filePath.mkdirs();
            }

            long contentLength = response.body().contentLength();
            byte[] buffer = new byte[1024];
            File file = new File(filePath.getCanonicalPath(), fileName);
            try (InputStream is = response.body().byteStream();
                 FileOutputStream fos = new FileOutputStream(file)) {
                 
                int length;
                long sum = 0;
                while ((length = is.read(buffer)) != -1) {
                    fos.write(buffer, 0, length);
                    sum += length;
                    int progress = (int) (sum * 1.0f / contentLength * 100);
                    callback.onProgress(progress);
                }
                fos.flush();

                callback.onSuccess();
            } catch (Exception e) {
                callback.onFailure();
            }
        }
    });
}

1. 添加下载失败重试机制：在下载过程中，如果下载失败了，可以再次尝试下载。可以添加一个计数器，在下载失败时递增，当达到一定次数时，提示用户下载失败。

修改下载过程中的回调方法如下：

@Override
public void onFailure(Call call, IOException e) {
    if (retryCount < MAX_RETRY_COUNT) {
        // 继续尝试下载，重试次数+1
        retryCount++;
        download(fileName, url, callback);
    } else {
        callback.onFailure();
    }
}

完整的更新代码如下：

public class UpdateService {
    private static final int MAX_RETRY_COUNT = 3; // 最大重试次数
    private static OkHttpClient okHttpClient;

    public static void download(final String fileName, String url, final UpdateCallback callback) {
        Request request = new Request.Builder()
            .addHeader("Accept-Encoding", "identity")
            .url(url)
            .build();

        if (okHttpClient == null) {
            okHttpClient = new OkHttpClient.Builder()
                .connectTimeout(10, TimeUnit.SECONDS)
                .readTimeout(10, TimeUnit.SECONDS)
                .writeTimeout(10, TimeUnit.SECONDS)
                .build();
        }

        okHttpClient.newCall(request).enqueue(new Callback() {
            private int retryCount = 0;

            @Override
            public void onFailure(Call call, IOException e) {
                if (retryCount < MAX_RETRY_COUNT) {
                    // 继续尝试下载，重试次数+1
                    retryCount++;
                    download(fileName, url, callback);
                } else {
                    callback.onFailure();
                }
            }

            @Override
            public void onResponse(Call call, Response response) throws IOException {
                if (response.body() == null) {
                    callback.onFailure();
                    return;
                }

                File filePath = new File(CommonConstants.DOWNLOAD_PATH);
                if (!filePath.exists()) {
                    filePath.mkdirs();
                }

                long contentLength = response.body().contentLength();
                byte[] buffer = new byte[1024];
                File file = new File(filePath.getCanonicalPath(), fileName);
                try (InputStream is = response.body().byteStream();
                     FileOutputStream fos = new FileOutputStream(file)) {

                    int length;
                    long sum = 0;
                    while ((length = is.read(buffer)) != -1) {
                        fos.write(buffer, 0, length);
                        sum += length;
                        int progress = (int) (sum * 1.0f / contentLength * 100);
                        callback.onProgress(progress);
                    }
                    fos.flush();

                    callback.onSuccess();
                } catch (Exception e) {
                    callback.onFailure();
                }
            }
        });
    }

    public interface UpdateCallback {

        void onSuccess();

        void onProgress(int progress);

        void onFailure();
    }
    
    // 其他方法
}

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