创建一个新工程LearnSendEmail

Activity_main.xml代码

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"  android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin"  android:paddingRight="@dimen/activity_horizontal_margin"  android:paddingTop="@dimen/activity_vertical_margin"  android:orientation="vertical"  android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity">  <EditText  android:layout_width="match_parent"  android:layout_height="wrap_content"  android:inputType="textEmailAddress"  android:ems="10"  android:id="@+id/editTextTo"  android:hint="邮箱地址如：[email protected]" />  <EditText  android:layout_width="match_parent"  android:layout_height="wrap_content"  android:id="@+id/editTextSubject"  android:hint="邮件主题subject" />  <ScrollView   android:layout_width="match_parent"  android:layout_height="wrap_content"  android:id="@+id/scrollView"  android:layout_weight="1">  <EditText  android:layout_width="match_parent"  android:layout_height="match_parent"  android:hint="输入邮件内容"  android:inputType="textMultiLine"  android:id="@+id/editTextMessage" />  </ScrollView>  <LinearLayout  android:orientation="horizontal"  android:layout_width="match_parent"  android:layout_height="wrap_content">  <Button  android:layout_width="wrap_content"  android:layout_height="wrap_content"  android:text="发送"  android:id="@+id/btnSend"  android:layout_weight="1" />  <Button  android:layout_width="wrap_content"  android:layout_height="wrap_content"  android:text="添加附件"  android:id="@+id/btnAttachment"  android:layout_weight="1" />  </LinearLayout> </LinearLayout>

MainActivity.java代码

package com.czg.com.learnsendemail; import android.content.Intent; import android.database.Cursor; import android.net.Uri; import android.provider.MediaStore; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.util.Log; import android.view.View; import android.widget.Button; import android.widget.EditText; import android.widget.Toast; public class MainActivity extends AppCompatActivity implements View.OnClickListener {  EditText editTextEmail,editTextSubject,editTextMessage;  Button btnSend,btnAttachment;  String email,subject,message,attachmentFile;  Uri URI=null;  private static final int PICK_FROM_GALLERY=101;  int columnIndex;  @Override  protected void onCreate(Bundle savedInstanceState) {  super.onCreate(savedInstanceState);  setContentView(R.layout.activity_main);  editTextEmail= (EditText) findViewById(R.id.editTextTo);  editTextSubject= (EditText) findViewById(R.id.editTextSubject);  editTextMessage= (EditText) findViewById(R.id.editTextMessage);  btnSend= (Button) findViewById(R.id.btnSend);  btnAttachment= (Button) findViewById(R.id.btnAttachment);  btnSend.setOnClickListener(this);  btnAttachment.setOnClickListener(this);  }  @Override  protected void onActivityResult(int requestCode, int resultCode, Intent data) {  super.onActivityResult(requestCode, resultCode, data);  if(requestCode==PICK_FROM_GALLERY && resultCode==RESULT_OK){  Uri 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("附件文件路径：",attachmentFile);  URI=Uri.parse("file://"+attachmentFile);  cursor.close();  }  }  @Override  public void onClick(View v) {  switch (v.getId()){  case R.id.btnAttachment:  openGallery();  break;  case R.id.btnSend:  email=editTextEmail.getText().toString();  subject=editTextSubject.getText().toString();  message=editTextMessage.getText().toString();  final Intent emailIntent=new Intent(Intent.ACTION_SEND);  emailIntent.setType("plain/text");  emailIntent.putExtra(Intent.EXTRA_EMAIL, new String[]{email});  emailIntent.putExtra(Intent.EXTRA_SUBJECT,subject);  if (URI!=null){  emailIntent.putExtra(Intent.EXTRA_STREAM,URI);  }  emailIntent.putExtra(Intent.EXTRA_TEXT, message);  try{  this.startActivity(Intent.createChooser(emailIntent,"发送邮件..."));  }  catch (Exception e){  Toast.makeText(this,"发送失败，可以再试发",Toast.LENGTH_LONG).show();  }  break;  }  }  private void openGallery() {  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);  } }

源码下载：https://yunpan.cn/crxHsVtSDQeYp 访问密码 5351