Question

＆＃34;文件无法附加＆＃34; 我正在尝试从我的应用程序附加图像并通过电子邮件将其作为附件发送。但是一旦我从Gallery中选择图像，应用程序就崩溃了。它曾经是我第一次执行应用程序时工作，但现在它似乎没有因某些原因而起作用。但后来我通过更新代码行来修复它：

        attachmentFile = cursor.getString(columnIndex);
        Log.d("Attachment Path: "," " + attachmentFile);

从我的Logcat中，我找不到导致此问题的语句。

最初，我指的是这个问题，并尝试了这里给出的答案＆＃34; java.lang.NullPointerException: println needs a message＆＃34;

＆＃34;我的DespatchActivity＆＃34;

package com.example.despatch4.resiscafftest;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.net.Uri;
import android.widget.Button;
import android.provider.MediaStore;
import android.database.Cursor;
import android.util.Log;
import android.widget.EditText;

import android.widget.CheckBox;
import android.widget.Toast;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class DespatchActivity extends AppCompatActivity {
private Activity activity;

Button Attachment;
String attachmentFile;
Uri URI = null;
int columnIndex;
private static final int PICK_FROM_GALLERY = 101;


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_despatch);
    this.setTitle("Residential Scaffold - Despatch");


    final EditText your_name = (EditText) findViewById(R.id.your_name);
    final EditText company_name = (EditText) findViewById(R.id.company_name);
    final EditText your_phone = (EditText) findViewById(R.id.your_ph);
    final EditText your_jobno = (EditText) findViewById(R.id.your_jobno);
    final EditText your_e_d =   (EditText) findViewById(R.id.your_e_d);
    final EditText job_details = (EditText) findViewById(R.id.job_details);
    final EditText your_date = (EditText) findViewById(R.id.your_date);

    Button email = (Button) findViewById(R.id.post_desp_message);
    Attachment = (Button) findViewById(R.id.bt_attach);

    email.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

            String name = your_name.getText().toString();
            String companyname = company_name.getText().toString();
            String phone = your_phone.getText().toString();
            String jobno = your_jobno.getText().toString();
            String ed = your_e_d.getText().toString();
            String jobdetails = job_details.getText().toString();
            String date = your_date.getText().toString();

            Intent sendEmail = new Intent(Intent.ACTION_SEND);



            sendEmail.setType("plain/text");
            sendEmail.putExtra(android.content.Intent.EXTRA_EMAIL, new String[]{"Zamil@residentialscaffold.com.au"});

            sendEmail.putExtra(android.content.Intent.EXTRA_TEXT, "Name: " + name + '\n' + '\n'  + "Company Name: " + companyname + '\n' + '\n'
                    + '\n' + "Contact Number: " + phone + '\n' + '\n'  + "Job Number: " + jobno + '\n' + '\n'  +  "Erect/Dismantle: " + ed + '\n' + '\n'  + "Job Details: "
                    + jobdetails + '\n' + '\n'  + "Date Required: " + date);
                if (URI != null) {
                sendEmail.putExtra(Intent.EXTRA_STREAM, selectedImage);
            }
            startActivity(Intent.createChooser(sendEmail, "Send mail..."));

        }
    });


    //attach images
    Attachment.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            openFolder();
        }
    });

}

protected void onActivityResult(int requestCode, int resultCode, Intent data)
{
Uri selectedImage = null;    
if (requestCode == PICK_FROM_GALLERY && resultCode == RESULT_OK) {
        selectedImage = data.getData();
        String[] filePathColumn = { MediaStore.Images.Media.DATA };
        Cursor cursor = getContentResolver().query(selectedImage,filePathColumn, null, null, null);
        cursor.moveToFirst();
        columnIndex = cursor.getColumnIndex(filePathColumn[0]);
        attachmentFile = cursor.getString(columnIndex);
        //Log.e("Attachment Path:", " " , attachmentFile);
        Log.d("Attachment Path: ","null" attachmentFile);
        URI = Uri.parse("file://" + attachmentFile);
        cursor.close();
    }
}

@Override
public void onResume() {
    super.onResume();
}

@Override
protected void onStart() {
    super.onStart();

}

@Override
protected void onStop() {
    super.onStop();

}

private boolean isValidEmail(String email) {
    String EMAIL_PATTERN = "^[_A-Za-z0-9-\\+]+(\\.[_A-Za-z0-9-]+)*@"
            + "[A-Za-z0-9-]+(\\.[A-Za-z0-9]+)*(\\.[A-Za-z]{2,})$";

    Pattern pattern = Pattern.compile(EMAIL_PATTERN);
    Matcher matcher = pattern.matcher(email);
    return matcher.matches();
}

public void openFolder()
{
    Intent intent = new Intent();
    intent.setType("image/*");
    intent.setAction(Intent.ACTION_GET_CONTENT);
    intent.putExtra("return-data", true);
    startActivityForResult(Intent.createChooser(intent, "Complete action using"), PICK_FROM_GALLERY);
}

}

一旦我尝试附加文件，这就是我的Logcat中发生的事情：

 01-23 10:23:48.123 4334-4334/com.example.despatch4.resiscafftest 
 D/Attachment Path:: nullnull

电子邮件客户端已成功启动，并带有Toast消息＆＃34;无法附加文件＆＃34;。

先谢谢。

Answer 1

sendEmail.putExtra(Intent.EXTRA_STREAM, URI);

将该行更改为

sendEmail.putExtra(Intent.EXTRA_STREAM, data.getData());

data.getData() onActivityResult()中的Intent intent = new Intent(getActivity(), InfoWindowActivity.class); intent.putExtra("snippet", snippet); intent.putExtra("id", id) ... //put all your info here startActivity(intent);。{/ p>

不要试图获得路径。

而是直接使用uri。

代码也少得多; - ）。

Android应用文件无法附加并作为电子邮件发送

1 个答案: