title: Select multiple files with Intent.ACTION_GET_CONTENT
body: <p>I'm trying to select multiple files with an Intent, but it seems like I'm missing on something.<br>
  I create an Intent.ACTION_GET_CONTENT Intent, put Intent.EXTRA_ALLOW_MULTIPLE as extra in <br> (it seems to perfectly fit the purpose) and create a chooser (optional), which chooses the application that should be able to pick multiple files and return them.  </p>
  
  <p>The Problem is that I can only pick a single file.</p>
  
  <p>I tried multiple file explorers.
  It's API 18 (4.3).  </p>
  
  <pre><code>ACTIVITY_CHOOSE_FILE = 1;  //global constant
  Button btn = (Button) this.findViewById(R.id.btnGetFiles);
  btn.setOnClickListener(new OnClickListener() {
    @Override  
    public void onClick(View v) {  
      Intent chooseFile;  
      Intent intent;  
      chooseFile = new Intent(Intent.ACTION_GET_CONTENT);  
      chooseFile.setType("file/*");  
      chooseFile.putExtra(Intent.EXTRA_ALLOW_MULTIPLE, true);  
      intent = Intent.createChooser(chooseFile, "Choose a file");  
      startActivityForResult(intent, ACTIVITY_CHOOSE_FILE);  
    }  
  });
  </code></pre>
  
  <p>I also added this to the Manifest (it had the same functionality before adding it):</p>
  
  <pre><code>        &lt;intent-filter&gt;
              &lt;action android:name="android.intent.action.GET_CONTENT" /&gt;
              &lt;category android:name="android.intent.category.DEFAULT" /&gt;
          &lt;/intent-filter&gt;  
  </code></pre>
  
  <p>Why can't I choose multiple files?<br>
  (For clarification: the problem is not, that multiple files aren't returned - I can't choose more than 1 file)</p>