发邮件

发送邮件使用android.content.Intent.ACTION_SEND,参数来实现通过手机发Email服务。收发Email的过程是通过android内置的Gmail程序，而非直接使用smtp的protocol，而模拟器上并未内置Gmail Client，因此该程序只能在真机上运行。
其实android中发送email有很多写法：
1.

Uri uri = Uri.parse("mailto:****@gmail.com");
Intent emailIntent = new Intent(Intent.ACTION_SEND,uri);
startActivity(emailIntent);

2. 如下面代码所示：

package com.kevin.email;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;

public class Main extends Activity {
	private Button btn_send;
	private EditText et_receiver,et_cc,et_subject,et_body;
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        et_receiver = (EditText) findViewById(R.id.et_receiver);
        et_cc = (EditText) findViewById(R.id.et_attached);
        et_subject = (EditText) findViewById(R.id.et_subject);
        et_body = (EditText) findViewById(R.id.et_body);
        btn_send = (Button) findViewById(R.id.btn_send);
        btn_send.setOnClickListener(new OnClickListener() {

			@Override
			public void onClick(View v) {
				// 通过Intent发送邮件
				Intent emailIntent = new Intent("android.content.Intent.ACTION_SEND");
				// 设置邮件格式
				emailIntent.setType("plain/text");
				// 取得收件人地址，抄送，主题，正文
				String[] receiver = new String[]{et_receiver.getText().toString()};
				String[] cc = new String[]{
						et_cc.getText().toString()
				};
				// 邮件信息
				String subject = et_subject.getText().toString();
				String body = et_body.getText().toString();
				emailIntent.putExtra("android.content.Intent.EXTRA_EMAIL", receiver);
				emailIntent.putExtra("android.content.Intent.EXTRA_CC", cc);
				emailIntent.putExtra("android.content.Intent.EXTRA_SUBJECT", subject);
				emailIntent.putExtra("android.content.Intent.EXTRA_TEXT", body);
				// 打开gmail并将相关参数传入
				startActivity(Intent.createChooser(emailIntent, getString(R.string.send)));
			}
		});
    }
}

上例中只是发送文字，如果你想发送有文件的email，代码如下：

Intent intent = new Intent(Intent.ACTION_SEND);
intent.putExtra(Intent.EXTRA_STREAM,"file:///sdcard/music.mp3");
intent.setType("audio/mp3");
startActivity(Intent.createChooser(intent,"发送中..."));