Android assest文件夹图像附件到电子邮件失败

我正在尝试向邮件发送附加assest文件夹图像的邮件，邮件已成功发送，但当我选中它时，邮件中没有附加图像， 这是我的密码

Uri uri = Uri.fromFile(new File("file:///android_asset/Hat_5.png"));

Intent intent = new Intent(Intent.ACTION_SEND);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
intent.setType("image/png");
intent.putExtra(Intent.EXTRA_EMAIL  , new String[] { "some@gmail.com"});
intent.putExtra(Intent.EXTRA_SUBJECT, "New Order");
intent.putExtra(Intent.EXTRA_TEXT   , "Order Id :" +imageId);
intent.putExtra(Intent.EXTRA_STREAM  , uri);
startActivity(Intent.createChooser(intent, "Send mail..."));

允许

<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

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您只能从SD卡附加文件。 您需要将图像复制到SD卡，并更改SD卡上文件路径的URI。

---

您可以在以后删除if。

如果需要，您可以这样做

String FILENAME = "avatar.png";
        FileOutputStream fos = null;

    try {

        fos = openFileOutput(FILENAME, Context.MODE_PRIVATE);

    } catch (FileNotFoundException e1) {

        e1.printStackTrace();
        Log.v("","FileNotFoundException: "+e1.getMessage());

    }

    try {
        InputStream inputStream = getAssets().open("avatar.jpg");


        byte buf[]=new byte[1024];
        int len;
        while((len=inputStream.read(buf))>0)
            fos.write(buf,0,len);
        fos.close();
        inputStream.close();

    } catch (IOException e1) {

        e1.printStackTrace();
        Log.v("","IOException: "+e1.getMessage());

    }

    // Get the file from internal storage

    String filePath = getApplicationContext().getFilesDir().getAbsolutePath();//returns current directory.
    File file = new File(filePath, FILENAME);

然后

并发送附件

Uri uri = Uri.fromFile(file);
intent.putExtra(Intent.EXTRA_STREAM  , uri);