Android从gmail应用程序获取附加文件名

Android get attached filename from gmail app(Android从gmail应用程序获取附加文件名)

问题描述

我必须从 gmail 应用程序中检索内容的文件名.

I have to retrieve the filename of the content from gmail app.

我得到的内容 uri 类似于

i get content uri some thing similar to

content://gmail-ls/messages/mymailid%40gmail.com/4/attachments/0.1/BEST/false

content://gmail-ls/messages/mymailid%40gmail.com/4/attachments/0.1/BEST/false

我看到一些应用程序从中获取文件名，例如 这个应用程序

i see some apps getting the file names from it like this app

请对此提供帮助.

提前致谢.

推荐答案

基本上，你需要获取文件系统，并获取存储信息的游标:

Basically, you need to acquire the file system and get a cursor where the info is stored:

import android.app.Activity;
import android.content.Intent;
import android.database.Cursor;
import android.os.Bundle;
import android.provider.MediaStore;
import android.widget.Toast;

public class CheckIt extends Activity {
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        Intent theIntent = getIntent();
        String attachmentFileName = "No file name found";
        if (theIntent != null && theIntent.getData() != null) {
            Cursor c = getContentResolver().query(
                theIntent.getData(), null, null, null, null);
            c.moveToFirst();
            final int fileNameColumnId = c.getColumnIndex(
                MediaStore.MediaColumns.DISPLAY_NAME);
            if (fileNameColumnId >= 0)
                attachmentFileName = c.getString(fileNameColumnId);
        }
        Toast.makeText(this, attachmentFileName, Toast.LENGTH_LONG).show();
    }

}

在返回的光标中还有另一列 - MediaStore.MediaColumns.SIZE.至少这是我在我的 Desire HD 上使用 GMail 所得到的.只需通过在 GMail 中操作邮件并点击预览按钮来尝试上述代码.

In the cursor returned there is another column - MediaStore.MediaColumns.SIZE. At least that's what I get with GMail on my Desire HD. Just try the above code by operning a mail in GMail and hitting the preview button.

当然，不要忘记将以下内容添加到 Manifest.xml 中的活动部分(不要从活动中删除 android.intent.category.LAUNCHER 意图过滤器部分，否则将无法通过启动器查看):

Of course, do not forget to add the following to the activity section in the Manifest.xml (do not drop the android.intent.category.LAUNCHER intent-filter section from the activity otherwise it will not be viewable through the launcher):

<intent-filter>
    <action android:name="android.intent.action.VIEW" />
    <category android:name="android.intent.category.DEFAULT" />
    <data android:mimeType="*/*" /> 
</intent-filter>

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