Android 共享自定义文件

Question

我创建了自己的文件扩展名 (.oli)。如果用户单击具有此扩展名的文件，我的应用程序将启动并加载包含的数据。这按预期工作。问题是我想让我的应用程序的用户有机会共享文件（示例：filename.oli）。

到目前为止我实现了这个：

public void shareFile(){
        File file = getShareableFile(); //Creates a .oli-file
        Intent shareIntent = new Intent(Intent.ACTION_SEND);
        Uri uri = Uri.fromFile(file);
        shareIntent.setType("*/*"); //Maybe the problem
        shareIntent.putExtra(Intent.EXTRA_STREAM, uri);
        shareIntent.putExtra(android.content.Intent.EXTRA_SUBJECT, name);
        startActivity(Intent.createChooser(shareIntent, getString(R.string.shareDatei)));
}

问题是，由于 shareIntent.setType("/")，自认为可以共享我的文件的应用列表非常多；如果您与不同的应用程序共享，则会发生以下两种情况：

如果我选择像 Gmail 这样的电子邮件应用程序来共享我的文件，它会按应有的方式工作。电子邮件包含文件 filename.oli 。当我点击它时，我的应用程序就会启动。

但是，如果我选择 Quickmemo-app，我会收到一条消息，指出此文件无法共享。

所以总而言之，我只想在选择器列表中显示可以处理共享我的扩展名为 .oli 的文件的应用程序。我怎么做？提前致谢！

Answer 1

setType() intent 方法实际上使用 MIME 类型根据 docs 过滤应用程序。因此，您将只能根据以下过滤器过滤可用的应用程序：

1.Text

sendIntent.setType("text/plain");

2。二进制

shareIntent.setType("image/jpeg");

3。多个内容项

shareIntent.setType("image/*");

编辑

这是我可能会做的事情，我会知道我希望哪些应用程序能够共享该文件，例如 gmail，因为您知道它可以工作，而且我会选择列表中的哪些应用程序。以下代码来自本SOlink中的答案：How to filter specific apps for ACTION_SEND intent (and set a different text for each app)

public void onShareClick(View v) {
    Resources resources = getResources();

    Intent emailIntent = new Intent();
    emailIntent.setAction(Intent.ACTION_SEND);
    // Native email client doesn't currently support HTML, but it doesn't hurt to try in case they fix it
    emailIntent.putExtra(Intent.EXTRA_TEXT, Html.fromHtml(resources.getString(R.string.share_email_native)));
    emailIntent.putExtra(Intent.EXTRA_SUBJECT, resources.getString(R.string.share_email_subject));
    emailIntent.setType("message/rfc822");

    PackageManager pm = getPackageManager();
    Intent sendIntent = new Intent(Intent.ACTION_SEND);     
    sendIntent.setType("text/plain");


    Intent openInChooser = Intent.createChooser(emailIntent, resources.getString(R.string.share_chooser_text));

    List<ResolveInfo> resInfo = pm.queryIntentActivities(sendIntent, 0);
    List<LabeledIntent> intentList = new ArrayList<LabeledIntent>();        
    for (int i = 0; i < resInfo.size(); i++) {
        // Extract the label, append it, and repackage it in a LabeledIntent
        ResolveInfo ri = resInfo.get(i);
        String packageName = ri.activityInfo.packageName;
        if(packageName.contains("android.email")) {
            emailIntent.setPackage(packageName);
        } else if(packageName.contains("twitter") || packageName.contains("facebook") || packageName.contains("mms") || packageName.contains("android.gm")) {
            Intent intent = new Intent();
            intent.setComponent(new ComponentName(packageName, ri.activityInfo.name));
            intent.setAction(Intent.ACTION_SEND);
            intent.setType("text/plain");
            if(packageName.contains("twitter")) {
                intent.putExtra(Intent.EXTRA_TEXT, resources.getString(R.string.share_twitter));
            } else if(packageName.contains("facebook")) {
                // Warning: Facebook IGNORES our text. They say "These fields are intended for users to express themselves. Pre-filling these fields erodes the authenticity of the user voice."
                // One workaround is to use the Facebook SDK to post, but that doesn't allow the user to choose how they want to share. We can also make a custom landing page, and the link
                // will show the <meta content ="..."> text from that page with our link in Facebook.
                intent.putExtra(Intent.EXTRA_TEXT, resources.getString(R.string.share_facebook));
            } else if(packageName.contains("mms")) {
                intent.putExtra(Intent.EXTRA_TEXT, resources.getString(R.string.share_sms));
            } else if(packageName.contains("android.gm")) { // If Gmail shows up twice, try removing this else-if clause and the reference to "android.gm" above
                intent.putExtra(Intent.EXTRA_TEXT, Html.fromHtml(resources.getString(R.string.share_email_gmail)));
                intent.putExtra(Intent.EXTRA_SUBJECT, resources.getString(R.string.share_email_subject));               
                intent.setType("message/rfc822");
            }

            intentList.add(new LabeledIntent(intent, packageName, ri.loadLabel(pm), ri.icon));
        }
    }

    // convert intentList to array
    LabeledIntent[] extraIntents = intentList.toArray( new LabeledIntent[ intentList.size() ]);

    openInChooser.putExtra(Intent.EXTRA_INITIAL_INTENTS, extraIntents);
    startActivity(openInChooser);       
}

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