Intent可以启动除了本程序的Activity以外可以启动系统自身的Activity

基于MainActivity.java的源代码进行如下改动，启动短信Activity。

package com.example.activity_02;

import android.net.Uri;

import android.os.Bundle;

import android.app.Activity;

//import android.content.DialogInterface;

//import android.content.DialogInterface.OnClickListener;

import android.content.Intent;

import android.view.Menu;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

public class MainActivity extends Activity {

 // 我的代码 生成一个监听

 private OnClickListener Listener = new OnClickListener() {

  // 单击按钮后要做的事情，此处是切换MainActivity到OtherActivity

  // 在onClick（View v）这个函数的参数可以不动，写成View myButton也不会发生错误

  public void onClick(View v) {
  Uri uri = Uri.parse("smsto:/800000123");

  Intent intent = new Intent(Intent.ACTION_SENDTO,uri);

  intent.putExtra("sms_body", "The SMS text");

  startActivity(intent); 

/* 如果想调用打电话Activity用如下代码

   Uri number = Uri.parse("tel:5551234");
   Intent callIntent = new Intent(Intent.ACTION_DIAL, number);
   startActivity(callIntent);

 

*/

  }

  /*

   * Intent intent = new Intent().setClass(MainActivity.this,

   * OtherActivity.class); intent.putExtra("TestIntent", "123"); //启动服务

   * 因为Activity继承了 所以也有这个方法 //这个在Mars的教程里面用的事this。Serviece但是不能启动

   * MainActivity.this.startActivity(intent);

   * //这里面我放个finish的目的就是看程序是否运行到此处 //finish();

   * //这里面要说一点这个函数式在帮助文件中的例子，所以看帮助文件还是很不错的。

   *  // do something when the

   * button is clicked }

   */

 };

如果想打开地图

 

View a map:

// Map point based on address
Uri location = Uri.parse("geo:0,0?q=1600+Amphitheatre+Parkway,+Mountain+View,+California");
// Or map point based on latitude/longitude
// Uri location = Uri.parse("geo:37.422219,-122.08364?z=14"); // z param is zoom level
Intent mapIntent = new Intent(Intent.ACTION_VIEW, location);    //测试未通过ForceStop

打开网页

Uri webpage = Uri.parse("http://www.android.com");
Intent webIntent = new Intent(Intent.ACTION_VIEW, webpage);

发EmailSend an email with an attachment:

Intent emailIntent = new Intent(Intent.ACTION_SEND);
// The intent does not have a URI, so declare the "text/plain" MIME type
emailIntent.setType(HTTP.PLAIN_TEXT_TYPE);
emailIntent.putExtra(Intent.EXTRA_EMAIL, new String[] {"jon@example.com"}); // recipients
emailIntent.putExtra(Intent.EXTRA_SUBJECT, "Email subject");
emailIntent.putExtra(Intent.EXTRA_TEXT, "Email message text");
emailIntent.putExtra(Intent.EXTRA_STREAM, Uri.parse("content://path/to/email/attachment"));
// You can also attach multiple items by passing an ArrayList of Uris  /*要包含import org.apache.http.protocol.HTTP;*/

启动日历事件

Intent calendarIntent = new Intent(Intent.ACTION_INSERT, Events.CONTENT_URI);
Calendar beginTime = Calendar.getInstance().set(2012, 0, 19, 7, 30);
Calendar endTime = Calendar.getInstance().set(2012, 0, 19, 10, 30);
calendarIntent.putExtra(CalendarContract.EXTRA_EVENT_BEGIN_TIME, beginTime.getTimeInMillis());
calendarIntent.putExtra(CalendarContract.EXTRA_EVENT_END_TIME, endTime.getTimeInMillis());
calendarIntent.putExtra(Events.TITLE, "Ninja class");
calendarIntent.putExtra(Events.EVENT_LOCATION, "Secret dojo");   运行不起来错误在第二，三行。