使用FileProvider时没有找到处理Intent的Activity

Question

在我的应用程序中,我有自定义自动下载和安装APK它的工作原理如下

  // auto register for the complete download
     activity.registerReceiver(onComplete, new IntentFilter(DownloadManager.ACTION_DOWNLOAD_COMPLETE));



 // Download the file through DownloadManager
 String destination = Environment.getExternalStorageDirectory() + "/";
    String fileName = "myfile.apk";
    destination += fileName;
    final Uri uri = Uri.parse("file://" + destination);
    DownloadManager.Request request = new  DownloadManager.Request(Uri.parse(apkUrl));
    request.setDescription("description");
    request.setTitle("title");
    request.setDestinationUri(uri);
    final DownloadManager manager = (DownloadManager) activity.getSystemService(Context.DOWNLOAD_SERVICE);
    final long downloadId = manager.enqueue(request);

onComplete = new BroadcastReceiver() {
      public void onReceive(Context ctxt, Intent intent) {

          Intent install = new Intent(Intent.ACTION_VIEW);
          // BEFORE working doing this
          //install.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
          //install.setDataAndType(uri,
          //    manager.getMimeTypeForDownloadedFile(downloadId));

          // Using file provider it doesnt work
          Uri apkUri = FileProvider.getUriForFile(AutoUpdate.this,
              "com.myapp", file);
                install.setDataAndType(apkUri,manager.getMimeTypeForDownloadedFile(downloadId));
          activity.startActivity(install);
          activity.unregisterReceiver(this);

      }
    };

Android清单:

<provider
            android:name="android.support.v4.content.FileProvider"
            android:authorities="com.myapp"
            android:exported="false"
            android:grantUriPermissions="true">
            <meta-data
                android:name="android.support.FILE_PROVIDER_PATHS"
                android:resource="@xml/provider_paths"/>
        </provider>

Provider_path(抱歉由于某种原因因此切断了路径标记)

external-path name ="myfolder"path ="."/>

当文件完成下载时,会调用onComplete,但是活动不会启动:

找不到处理Intent的活动{act = android.intent.action.VIEW dat = content://com.myapp/myfolder/myfile.apk typ = application/vnd.android.package-archive flg = 0x4000000}

使用普通文件时://确实有效

使用文件提供程序时是否存在我遗漏的内容？活动是否因为找不到文件而无法启动？我需要额外的许可吗？(目前我在外部存储上有INTERNET,READ和WRITE)

Answer 1

软件包安装程序仅支持content从Android 7.0开始的方案.在此之前 - 尽管文档相反 - 包安装程序仅支持file方案.

您需要Uri根据您Intent是否在Android 7.0+上运行来设置不同的内容,例如通过分支Build.VERSION.SDK_INT.

Answer 2

Commonware 是正确的，对于那些寻找代码的人：

BroadcastReceiver onComplete = new BroadcastReceiver() {
       public void onReceive(Context ctxt, Intent intent) {

       downloadButton.setEnabled(true);
       downloadButton.setText("Terminado");
       progressbar.setVisibility(View.GONE);

       if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.N){
            Intent install = new Intent(Intent.ACTION_VIEW);
            install.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);

            Uri apkURI = FileProvider.getUriForFile(
                     self,
                     self.getApplicationContext()
                     .getPackageName() + ".provider", file);
            install.setDataAndType(apkURI,
                    manager.getMimeTypeForDownloadedFile(downloadId));
            install.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
            startActivity(install);
       } else{
            String destination = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS) + "/";
            String fileName = "surveyevent.apk";
            destination += fileName;
            Uri uri = Uri.parse("file://" + destination);

            Intent install = new Intent(Intent.ACTION_VIEW);
            install.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
            install.setDataAndType(uri,
                    manager.getMimeTypeForDownloadedFile(downloadId));
            startActivity(install);
       }
       unregisterReceiver(this);
       finish();
  }
};