Android8.0应用内升级安装程序

Android8.0 应用内升级安装程序

1 判断升级

第一步自然是通过后台接口获取最新版本号判断是否需要升级，这里不多做记录；

2 下载应用

判断需要下载后，下载应用；

这里定义一个接口，回调下载失败，下载中，下载完成三种状态：

public interface OnDownLoadListener {
    //下载成功
    void onDownloadSuccess();
    //下载进度
    void onDownloading(int progress);
    //下载失败
    void onDownloadFailed();
}

那么下载就应该是这样：

Request request = new Request.Builder()
        .addHeader("Cookie", cookie)
        .url(urlBuilder.build())
        .get()
        .build();
getClientInstance().newCall(request).enqueue(new Callback() {
    @Override
    public void onFailure(Call call, IOException e) {
        Log.e(TAG, "onFailure: " + e);
        listener.onDownloadFailed();
    }
    @Override
    public void onResponse(Call call, Response response) throws IOException {
        if (!response.isSuccessful()) {
            Log.e(TAG, "onResponse: failed,error code: " + response.code());
            listener.onDownloadFailed();
        }
        InputStream is = null;
        byte[] buf = new byte[2048];
        int len = 0;
        FileOutputStream fos = null;
        //存储下载文件的目录
        File file = new File(Environment.getExternalStorageDirectory()
                + Configs.SystemPicture.SAVE_DIRECTORY,
                apkType + Configs.SAVE_APK_NAME);
        if (!file.exists()) {
            file.createNewFile();
        }
        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);
                listener.onDownloading(progress);
            }
            fos.flush();
            listener.onDownloadSuccess();
            //下载完成
        } catch (Exception e) {
            listener.onDownloadFailed();
        } finally {
            try {
                if (is != null) {
                    is.close();
                }
            } catch (IOException e) {
            }
            try {
                if (fos != null) {
                    fos.close();
                }
            } catch (IOException e) {
            }
        }
    }
});

注意,这里既然涉及到保存到硬盘中就需要申请读写权限；

3 将进度条显示到通知中

在一个单独的Service中操作下载进度显示这是必须的，调用下载方法并实现这个回调，使用Handler来发送消息：

URLUtils.downloadApk(VersionUpdateService.this, finalApkType, version, new URLUtils.OnDownLoadListener() {
    @Override
    public void onDownloadSuccess() {
        Message msg = Message.obtain();
        msg.what = MSG_APK_DOWNLOAD_FINISH;
        handler.sendMessage(msg);
    }
    @Override
    public void onDownloading(final int progress) {
        Message msg = Message.obtain();
        msg.what = MSG_APK_DOWNLOAD_PROGRESS;
        msg.arg1 = progress;
        handler.sendMessage(msg);
    }
    @Override
    public void onDownloadFailed() {
        Message msg = Message.obtain();
        msg.what = MSG_APK_DOWNLOAD_FAILED;
        handler.sendMessage(msg);
    }
});

4 发送通知

发送通知，自定义通知布局什么的都不赘述，注意Android8.0的通知需要设置NotificationChannel;

5 安装应用

下载完成之后，自然就要安装应用，安装应用首先就需要获取到文件，Android7.0以后获取文件需要共享```AndroidManifest.xml````,配置如下：

在res\xml\中新建文件file_paths.xml,属性可自己设置：

安装应用：

 Intent intent = new Intent(Intent.ACTION_VIEW);
 //获取指定位置文件
 File file = new File(Environment.getExternalStorageDirectory()
         + Configs.SystemPicture.SAVE_DIRECTORY,
         finalApkType + Configs.SAVE_APK_NAME);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
    String packageName = getPackageName();
    Uri contentUri = FileProvider.getUriForFile(VersionUpdateService.this,
            packageName + ".fileprovider", file);
    intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
    intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
    intent.setDataAndType(contentUri, "application/vnd.android.package-archive");
} else {
    intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
    intent.setDataAndType(Uri.fromFile(file), "application/vnd.android.package-archive");
}
startActivity(intent);

同时，在Android8.0及以后，安装应用需要打开安装第三方应用权限许可，如下判断，或申请：

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O){
    boolean installAllowed=getPackageManager().canRequestPackageInstalls();
    if (installAllowed){
        //权限许可，安装应用
    }else {
        Intent intent1=new Intent(Settings.ACTION_MANAGE_UNKNOWN_APP_SOURCES);
        intent1.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        startActivity(intent1);
    }
}