有没有办法对任何类型的文件附加到使用意图的电子邮件？

Question

我试图创建一个小的应用程序，用户可以键入recepient，主题，邮件，如果他们想，也附加文件。我跑了一个小问题，我不能选择的任何文件自如。我通过我的文件夹，找到图像和PDF文件，但他们都不是可以点击的，我不能任意选择（他们灰色出于某种原因）。

我可以选择一个文件一次（不记得是什么类型的），但我从Outlook应用IO错误，无法处理由于某种原因该文件。

public class MainActivity extends AppCompatActivity {

private static final int PICKFILE_REQUEST_CODE = 8778;
private EditText mEditTextTo;
private EditText mEditTextSubject;
private EditText mEditTextMessage;
private Button sendBtn;
private Button fileBtn;
private String filePath = null;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    mEditTextTo = (EditText)findViewById(R.id.edit_text_to);
    mEditTextSubject = (EditText)findViewById(R.id.edit_text_subject);
    mEditTextMessage = (EditText)findViewById(R.id.edit_text_message);
    sendBtn = (Button)findViewById(R.id.sendBtn);
    fileBtn = (Button)findViewById(R.id.fileBtn);

    sendBtn.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            sendMail();
        }
    });

    fileBtn.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
            intent.setType("file/*");
            startActivityForResult(intent, PICKFILE_REQUEST_CODE);
        }
    });
}

    private void sendMail() {
        String recepientList = mEditTextTo.getText().toString();
        String[] recepient = recepientList.split(",");
        String subject = mEditTextSubject.getText().toString();
        String message = mEditTextMessage.getText().toString();

        Intent sendEmailIntent = new Intent(Intent.ACTION_SEND);
        sendEmailIntent.putExtra(Intent.EXTRA_EMAIL, recepient);
        sendEmailIntent.putExtra(Intent.EXTRA_SUBJECT, subject);
        sendEmailIntent.putExtra(Intent.EXTRA_TEXT, message);

       sendEmailIntent.putExtra(Intent.EXTRA_STREAM, Uri.fromFile(new 
    File(filePath)));
       sendEmailIntent.setType("text/plain");
        startActivity(Intent.createChooser(sendEmailIntent, "Choose email 
    client"));
    }

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent 
data) {
    filePath = data.getDataString();
    super.onActivityResult(requestCode, resultCode, data);
    }
}

Answer 1

您可以使用下面的代码：

Intent intent = new Intent(Intent.ACTION_SEND);
intent.setType("text/plain");
intent.putExtra(Intent.EXTRA_EMAIL, new String[] {"[email protected]"});
intent.putExtra(Intent.EXTRA_SUBJECT, "subject here");
intent.putExtra(Intent.EXTRA_TEXT, "body text");
File root = Environment.getExternalStorageDirectory();
File file = new File(root, xmlFilename);
if (!file.exists() || !file.canRead()) {
    Toast.makeText(this, "Attachment Error", Toast.LENGTH_SHORT).show();
    finish();
    return;
}
Uri.fromFile(file);
intent.putExtra(Intent.EXTRA_STREAM, uri);
startActivity(Intent.createChooser(intent, "Send email..."));