Register Activity To Open Any File With Certain Ex

问题:

I've been working on an application which is set to open a file with a specific extension. It works some times with Gmail (some files open, while some don't), and I can open a file from the file explorer.

I can't open the files from the Email application on the phone however and as I say, some files do not open from the Gmail application with my application and some do!

Here is my code.

             <intent-filter > <!-- Solution from @richardlegget on this question http://stackoverflow.com/questions/8148629/intent-filter-to-download-attachment-from-gmail-apps-on-android -->
                <action android:name="android.intent.action.VIEW" />
                <category android:name="android.intent.category.DEFAULT" />
                <data android:mimeType="application/octet-stream" android:pathPattern=".*\\.myextension" />
             </intent-filter>
             <intent-filter >
                <action android:name="android.intent.action.VIEW" />
                <category android:name="android.intent.category.DEFAULT" />
                <data android:mimeType="*/*" android:scheme="file" android:host="*" android:pathPattern=".*\\.myextension" />
             </intent-filter>

My Question

Is there a blanket set of intent-filters that register a specific activity with any file containing the desired file extension from anywhere on the Android device?

回答1:

Not sure why are you using separate intent-filters when you can do it using a single tag.

        <intent-filter>
            <action android:name="android.intent.action.VIEW" />
            <category android:name="android.intent.category.DEFAULT" />
            <category android:name="android.intent.category.BROWSABLE" />
            <data android:scheme="http" android:host="*"
                android:pathPattern=".*\\.myextension" />
            <data android:scheme="https" android:host="*"
                android:pathPattern=".*\\.myextension" />
            <data android:scheme="content" android:host="*"
                android:pathPattern=".*\\.myextension" />
            <data android:scheme="file" android:host="*"
                android:pathPattern=".*\\.myextension" />
        </intent-filter>

There might be a permissions problem. I.E If your activity is set to open in separate task, then cannot access files created/owned by other applications. You'l have to set intent flags such that it opens in the same application.

回答2:

Try multiple <data android:pathPattern/> like this answer suggests

回答3:

You need to resolve your path yourself when the scheme is content, i.e. when you receive a URI to a ContentProvider. The system will look at the mime type for your by call to ContentResolver.getType(Uri uri) before your intent filter is checked, hence you need the code below.

Resolve the file path to your file by fetching a Cursor from the URI containing content scheme and query the _data column:

Cursor cursor = getContentResolver().query(URI, null, null, null, null);
if (cursor != null && cursor.moveToFirst()) { 
    int idx = cursor.getColumnIndex(MediaStore.Images.ImageColumns.DATA); 
    return cursor.getString(idx);
} 

And add this intent-filter:

<intent-filter >
    <action android:name="android.intent.action.VIEW" />
    <category android:name="android.intent.category.DEFAULT" />
    <data android:scheme="content" />
    <data android:mimeType="ourapp/ourfileextension" />
    <data android:mimeType="application/zip" />
    <data android:mimeType="application/octet-stream" />
</intent-filter>

回答4:

• Can open any type of file. But here i handled repeatedly used file types, without disturbing default behaviour.

• And the snippet is as below...

  public void openAllFiles(File url) throws IOException { // Create URI File file=url; Uri uri = Uri.fromFile(file);

  Intent intent = new Intent(Intent.ACTION_VIEW);
  // Check what kind of file you are trying to open, by comparing the url with extensions.
  // When the if condition is matched, plugin sets the correct intent (mime) type,
  // so Android knew what application to use to open the file
  if (url.toString().contains(".doc") || url.toString().contains(".docx")) {
      // Word document
      intent.setDataAndType(uri, "application/msword");
  } else if(url.toString().contains(".pdf")) {
      // PDF file
      intent.setDataAndType(uri, "application/pdf");
  } else if(url.toString().contains(".ppt") || url.toString().contains(".pptx")) {
      // Powerpoint file
      intent.setDataAndType(uri, "application/vnd.ms-powerpoint");
  } else if(url.toString().contains(".xls") || url.toString().contains(".xlsx")) {
      // Excel file
      intent.setDataAndType(uri, "application/vnd.ms-excel");
  } else if(url.toString().contains(".zip") || url.toString().contains(".rar")) {
      // WAV audio file
      intent.setDataAndType(uri, "application/x-wav");
  } else if(url.toString().contains(".rtf")) {
      // RTF file
      intent.setDataAndType(uri, "application/rtf");
  } else if(url.toString().contains(".wav") || url.toString().contains(".mp3")) {
      // WAV audio file
      intent.setDataAndType(uri, "audio/x-wav");
  } else if(url.toString().contains(".gif")) {
      // GIF file
      intent.setDataAndType(uri, "image/gif");
  } else if(url.toString().contains(".jpg") || url.toString().contains(".jpeg") || url.toString().contains(".png")) {
      // JPG file
      intent.setDataAndType(uri, "image/jpeg");
  } else if(url.toString().contains(".txt")) {
      // Text file
      intent.setDataAndType(uri, "text/plain");
  } else if(url.toString().contains(".3gp") || url.toString().contains(".mpg") || url.toString().contains(".mpeg") || url.toString().contains(".mpe") || url.toString().contains(".mp4") || url.toString().contains(".avi")) {
      // Video files
      intent.setDataAndType(uri, "video/*");
  } else {
      //if you want you can also define the intent type for any other file
  
      //additionally use else clause below, to manage other unknown extensions
      //in this case, Android will show all applications installed on the device
      //so you can choose which application to use
      intent.setDataAndType(uri, "*/*");
  }
  
  intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
  startActivity(intent); 
  

  }