如何使用Intent在Android中发送电子邮件

我们可以通过Intent在Android中轻松发送电子邮件。您只需按照以下给出的几行代码即可。

Intent email = new Intent(Intent.ACTION_SEND);
email.putExtra(Intent.EXTRA_EMAIL, new String[]{ to});
email.putExtra(Intent.EXTRA_SUBJECT, subject);
email.putExtra(Intent.EXTRA_TEXT, message);

//need this to prompts email client only
email.setType("message/rfc822");

startActivity(Intent.createChooser(email, "Choose an Email client :"));

Android中的电话呼叫示例

activity_main.xml

从工具栏中拖动2个EditTexts，1个多行EditText，3个TextViews和1个Button，现在activity_main.xml文件将如下所示：

<RelativeLayout xmlns:androclass="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity" >

    <EditText
        android:id="@+id/editText1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentRight="true"
        android:layout_alignParentTop="true"
        android:layout_marginRight="22dp"
        android:layout_marginTop="16dp"
        android:ems="10" />

    <EditText
        android:id="@+id/editText2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/editText1"
        android:layout_below="@+id/editText1"
        android:layout_marginTop="18dp"
        android:ems="10" >

        <requestFocus />
    </EditText>

    <EditText
        android:id="@+id/editText3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/editText2"
        android:layout_below="@+id/editText2"
        android:layout_marginTop="28dp"
        android:ems="10"
        android:inputType="textMultiLine" />

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignBaseline="@+id/editText1"
        android:layout_alignBottom="@+id/editText1"
        android:layout_alignParentLeft="true"
        android:text="To:" />

    <TextView
        android:id="@+id/textView2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignBaseline="@+id/editText2"
        android:layout_alignBottom="@+id/editText2"
        android:layout_alignParentLeft="true"
        android:text="Subject:" />

    <TextView
        android:id="@+id/textView3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignBaseline="@+id/editText3"
        android:layout_alignBottom="@+id/editText3"
        android:layout_alignParentLeft="true"
        android:text="Message:" />

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/editText3"
        android:layout_below="@+id/editText3"
        android:layout_marginLeft="76dp"
        android:layout_marginTop="20dp"
        android:text="Send" />

</RelativeLayout>

Activity类

让我们编写代码通过Intent发送电子邮件。

package com.example.sendemail;

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

public class MainActivity extends Activity {
    EditText editTextTo,editTextSubject,editTextMessage;
    Button send;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        editTextTo=(EditText)findViewById(R.id.editText1);
        editTextSubject=(EditText)findViewById(R.id.editText2);
        editTextMessage=(EditText)findViewById(R.id.editText3);

        send=(Button)findViewById(R.id.button1);

        send.setOnClickListener(new OnClickListener(){

            @Override
            public void onClick(View arg0) {
                 String to=editTextTo.getText().toString();
                 String subject=editTextSubject.getText().toString();
                 String message=editTextMessage.getText().toString();


                 Intent email = new Intent(Intent.ACTION_SEND);
                  email.putExtra(Intent.EXTRA_EMAIL, new String[]{ to});
                  email.putExtra(Intent.EXTRA_SUBJECT, subject);
                  email.putExtra(Intent.EXTRA_TEXT, message);

                  //need this to prompts email client only
                  email.setType("message/rfc822");

                  startActivity(Intent.createChooser(email, "Choose an Email client :"));

            }

        });
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.activity_main, menu);
        return true;
    }

}