系统提供的默认activity（拨打电话，发送短信，发送彩信，打开浏览器，发邮件，拍照）...

//1.拨打电话// 给移动客服10086拨打电话Uri uri = Uri.parse("tel:10086");Intent intent = new Intent(Intent.ACTION_DIAL, uri);startActivity(intent);//2.发送短信// 给10086发送内容为“Hello”的短信Uri uri = Uri.parse("smsto:10086");Intent intent = new Intent(Intent.ACTION_SENDTO, uri);intent.putExtra("sms_body", "Hello");startActivity(intent);//3.发送彩信（相当于发送带附件的短信）Intent intent = new Intent(Intent.ACTION_SEND);intent.putExtra("sms_body", "Hello");Uri uri = Uri.parse("content://media/external/images/media/23");intent.putExtra(Intent.EXTRA_STREAM, uri);intent.setType("image/png");startActivity(intent);//4.打开浏览器:// 打开Google主页Uri uri = Uri.parse("http://www.baidu.com");Intent intent  = new Intent(Intent.ACTION_VIEW, uri);startActivity(intent);//5.发送电子邮件:(阉割了Google服务的没戏!!!!)// 给[e-mail]发邮件Uri uri = Uri.parse("mailto:[e-mail]");Intent intent = new Intent(Intent.ACTION_SENDTO, uri);startActivity(intent);// 给[e-mail]发邮件发送内容为“Hello”的邮件Intent intent = new Intent(Intent.ACTION_SEND);intent.putExtra(Intent.EXTRA_EMAIL, "[e-mail]");intent.putExtra(Intent.EXTRA_SUBJECT, "Subject");intent.putExtra(Intent.EXTRA_TEXT, "Hello");intent.setType("text/plain");startActivity(intent);// 给多人发邮件Intent intent=new Intent(Intent.ACTION_SEND);String[] tos = {"[e-mail]", "[e-mail]"}; // 收件人String[] ccs = {"[e-mail]", "[e-mail]"}; // 抄送String[] bccs = {"[e-mail]", "[e-mail]"}; // 密送intent.putExtra(Intent.EXTRA_EMAIL, tos);intent.putExtra(Intent.EXTRA_CC, ccs);intent.putExtra(Intent.EXTRA_BCC, bccs);intent.putExtra(Intent.EXTRA_SUBJECT, "Subject");intent.putExtra(Intent.EXTRA_TEXT, "Hello");intent.setType("message/rfc822");startActivity(intent);//6.显示地图:// 打开Google地图中国北京位置（北纬39.9，东经116.3）Uri uri = Uri.parse("geo:39.9,116.3");Intent intent = new Intent(Intent.ACTION_VIEW, uri);startActivity(intent);//7.路径规划// 路径规划：从北京某地（北纬39.9，东经116.3）到上海某地（北纬31.2，东经121.4）Uri uri = Uri.parse("http://maps.google.com/maps?f=d&saddr=39.9 116.3&daddr=31.2 121.4");Intent intent = new Intent(Intent.ACTION_VIEW, uri);startActivity(intent);//8.多媒体播放:Intent intent = new Intent(Intent.ACTION_VIEW);Uri uri = Uri.parse("file:///sdcard/foo.mp3");intent.setDataAndType(uri, "audio/mp3");startActivity(intent);//获取SD卡下所有音频文件,然后播放第一首=-= Uri uri = Uri.withAppendedPath(MediaStore.Audio.Media.INTERNAL_CONTENT_URI, "1");Intent intent = new Intent(Intent.ACTION_VIEW, uri);startActivity(intent);//9.打开摄像头拍照:// 打开拍照程序Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE); startActivityForResult(intent, 0);// 取出照片数据Bundle extras = intent.getExtras(); Bitmap bitmap = (Bitmap) extras.get("data");//另一种://调用系统相机应用程序，并存储拍下来的照片Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE); time = Calendar.getInstance().getTimeInMillis();intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(new File(Environment.getExternalStorageDirectory().getAbsolutePath()+"/tucue", time + ".jpg")));startActivityForResult(intent, ACTIVITY_GET_CAMERA_IMAGE);//10.获取并剪切图片// 获取并剪切图片Intent intent = new Intent(Intent.ACTION_GET_CONTENT);intent.setType("image/*");intent.putExtra("crop", "true"); // 开启剪切intent.putExtra("aspectX", 1); // 剪切的宽高比为1：2intent.putExtra("aspectY", 2);intent.putExtra("outputX", 20); // 保存图片的宽和高intent.putExtra("outputY", 40); intent.putExtra("output", Uri.fromFile(new File("/mnt/sdcard/temp"))); // 保存路径intent.putExtra("outputFormat", "JPEG");// 返回格式startActivityForResult(intent, 0);// 剪切特定图片Intent intent = new Intent("com.android.camera.action.CROP"); intent.setClassName("com.android.camera", "com.android.camera.CropImage"); intent.setData(Uri.fromFile(new File("/mnt/sdcard/temp"))); intent.putExtra("outputX", 1); // 剪切的宽高比为1：2intent.putExtra("outputY", 2);intent.putExtra("aspectX", 20); // 保存图片的宽和高intent.putExtra("aspectY", 40);intent.putExtra("scale", true);intent.putExtra("noFaceDetection", true); intent.putExtra("output", Uri.parse("file:///mnt/sdcard/temp")); startActivityForResult(intent, 0);//11.打开Google Market // 打开Google Market直接进入该程序的详细页面Uri uri = Uri.parse("market://details?id=" + "com.demo.app");Intent intent = new Intent(Intent.ACTION_VIEW, uri);startActivity(intent);//12.进入手机设置界面:// 进入无线网络设置界面（其它可以举一反三）  Intent intent = new Intent(android.provider.Settings.ACTION_WIRELESS_SETTINGS);  startActivityForResult(intent, 0);//13.安装apk:Uri installUri = Uri.fromParts("package", "xxx", null);   returnIt = new Intent(Intent.ACTION_PACKAGE_ADDED, installUri);//14.卸载apk:Uri uri = Uri.fromParts("package", strPackageName, null);      Intent it = new Intent(Intent.ACTION_DELETE, uri);      startActivity(it); //15.发送附件:Intent it = new Intent(Intent.ACTION_SEND);      it.putExtra(Intent.EXTRA_SUBJECT, "The email subject text");      it.putExtra(Intent.EXTRA_STREAM, "file:///sdcard/eoe.mp3");      sendIntent.setType("audio/mp3");      startActivity(Intent.createChooser(it, "Choose Email Client"));//16.进入联系人页面:Intent intent = new Intent();intent.setAction(Intent.ACTION_VIEW);intent.setData(People.CONTENT_URI);startActivity(intent);//17.查看指定联系人:Uri personUri = ContentUris.withAppendedId(People.CONTENT_URI, info.id);//info.id联系人IDIntent intent = new Intent();intent.setAction(Intent.ACTION_VIEW);intent.setData(personUri);startActivity(intent);