Android 下载apk提示更新以及解决Android 6.0 Marshmallow提示更新报错问题

下载并安装apk的方法很多，但是谷歌还是建议我们采用DownloadManager。

下载更新的代码比较简单，分如下几块：

启动下载

public long startDownload(String uri, String title, String description) {        DownloadManager.Request req = new DownloadManager.Request(Uri.parse(uri));        req.setAllowedNetworkTypes(DownloadManager.Request.NETWORK_WIFI);        //req.setAllowedOverRoaming(false);        req.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);        //设置文件的保存的位置[三种方式]        //第一种        //file:///storage/emulated/0/Android/data/your-package/files/Download/update.apk        req.setDestinationInExternalFilesDir(context, Environment.DIRECTORY_DOWNLOADS, "update.apk");        //第二种        //file:///storage/emulated/0/Download/update.apk        //req.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, "update.apk");        //第三种 自定义文件路径        //req.setDestinationUri()        // 设置一些基本显示信息        req.setTitle(title);        req.setDescription(description);        //req.setMimeType("application/vnd.android.package-archive");        return dm.enqueue(req);    }

然后是监听下载完成的Receive

public class ApkInstallReceiver extends BroadcastReceiver {    @Override    public void onReceive(Context context, Intent intent) {        if (intent.getAction().equals(DownloadManager.ACTION_DOWNLOAD_COMPLETE)) {            long downloadApkId = intent.getLongExtra(DownloadManager.EXTRA_DOWNLOAD_ID, -1);            long id = PrefUtils.getDownloadId();            if (downloadApkId == id) {                installApk(context, downloadApkId);            }        }    } private  void installApk(Context context, long downloadApkId) {            Intent install = new Intent(Intent.ACTION_VIEW);            DownloadManager dManager = (DownloadManager) context.getSystemService(Context.DOWNLOAD_SERVICE);            Uri downloadFileUri = dManager.getUriForDownloadedFile(downloadApkId);            if (downloadFileUri != null) {                Log.d("DownloadManager", downloadFileUri.toString());                install.setDataAndType(downloadFileUri, "application/vnd.android.package-archive");                install.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);                context.startActivity(install);            } else {                Log.e("DownloadManager", "下载失败");            }    }

上面的做法在Android 6.0 Marshmallow 系统之前是没有问题的，但是在6.0之后，会报错，倒是应用直接挂掉；报错LOG如下:

Caused by: android.content.ActivityNotFoundException: No Activity found to handle Intent { act=android.intent.action.VIEW dat=content: typ=application/vnd.android.package-archive flg=0x10000000 }

经过查看Uri的值，发现6.0与之前的不一样

6.0的downloadFileUri 值为: content://downloads/my_downloads/10
6.0之前的downloadFileUri 值为:file:///storage/emulated/0/Android/data/com.chiclam.download/files/Download/update-2.apk

经过在谷歌上搜索，终于有了解决办法。一下就是解决路径http://stackoverflow.com/questions/33315849/android-6-get-path-to-downloaded-file

完整的解决写法：

private  void installApk(Context context, long downloadApkId) {        DownloadManager dManager = (DownloadManager) context.getSystemService(Context.DOWNLOAD_SERVICE);        DownloadManager.Query query = new DownloadManager.Query();        query.setFilterById(downloadApkId);        Cursor c = dManager.query(query);        if(c != null) {            if (c.moveToFirst()) {                int columnIndex = c.getColumnIndex(DownloadManager.COLUMN_STATUS);                if (DownloadManager.STATUS_SUCCESSFUL == c.getInt(columnIndex)) {                    String downloadFileUrl = c.getString(c.getColumnIndex(DownloadManager.COLUMN_LOCAL_URI));                    startInstall(context, Uri.parse(downloadFileUrl));                }            }            c.close();        }    }private boolean startInstall(Context context, Uri uri) {        if(!new File( uri.getPath()).exists()) {            System.out.println( " local file has been deleted! ");            return false;        }        Intent intent = new Intent();        intent.addFlags( Intent.FLAG_ACTIVITY_NEW_TASK);        intent.setAction( Intent.ACTION_VIEW);        intent.setDataAndType( uri, "application/vnd.android.package-archive");        context.startActivity( intent);        return true;    }

这样便完美解决了6.0上自动启动更新界面BUG；