@Override
public void onClick(View v)
{
    String filePath = (String)v.getTag();
    File fileToView = new File(filePath);
    Intent viewIntent = new Intent(Intent.ACTION_VIEW);
    viewIntent.setData(Uri.fromFile(fileToView));
    final Intent chooserIntent = Intent.createChooser(viewIntent, "Choose an app to open this file:");
    startActivity(chooserIntent);
}

<activity
        android:name="YOUR_PICKED_ACTIVITY"
        android:launchMode="singleTask"
        android:screenOrientation="portrait"
        android:theme="@style/AppTheme"
        android:windowSoftInputMode="adjustResize">
        <intent-filter>
            <action android:name="android.intent.action.SEND" />
            <category android:name="android.intent.category.DEFAULT" />
            <data android:mimeType="*/*" //THIS IS THE TYPE OF YOUR FILE */* for any file />
        </intent-filter>
    </activity>