URL和URI的区别详谈

1.URI是java.net包下的，Uri是android.net包下的，在Android开发中使用Uri即可

2.Uri是用来标示资源的，URL是一种特殊的Uri，专门用来指向网络资源，URL可以通过openStream或者openConnection来获取资源

3.Uri简介

就Android平台而言，URI主要分三个部分：scheme, authority and path。其中authority又分为host和port。格式如下：

 scheme://host:port/path

 举个实际的例子：

 content://com.example.project:200/folder/subfolder/etc

 \-----/  \------------------/\---/\-------------------/

 scheme           host         port        path

          \-----------------------/

                 authority   

举些例子，如： 

所有联系人的Uri： content://contacts/people

某个联系人的Uri: content://contacts/people/5

所有图片Uri: content://media/external

某个图片的Uri：content://media/external/images/media/4

下面是一些常用的Uri

 

显示网页:

   1. Uri uri = Uri.parse("http://www.google.com");

   2. Intent it = new Intent(Intent.ACTION_VIEW,uri);

   3. startActivity(it);

 显示地图:

 1. Uri uri = Uri.parse("geo:38.899533,-77.036476");

   2. Intent it = new Intent(Intent.Action_VIEW,uri);

   3. startActivity(it);

 拨打电话:

 调用拨号程序

   1. Uri uri = Uri.parse("tel:xxxxxx");

   2. Intent it = new Intent(Intent.ACTION_DIAL, uri);   

   3. startActivity(it);   

   1. Uri uri = Uri.parse("tel.xxxxxx");

   2. Intent it =new Intent(Intent.ACTION_CALL,uri);

   3. 要使用这个必须在配置文件中加入<uses-permission id="Android.permission.CALL_PHONE" />

 发送短信

   1. Uri uri = Uri.parse("smsto:0800000123");

   2. Intent it = new Intent(Intent.ACTION_SENDTO, uri);

   3. it.putExtra("sms_body", "The SMS text");

   4. startActivity(it);   

 发送Email

   1.

   2. Uri uri = Uri.parse("mailto:xxx@abc.com");

   3. Intent it = new Intent(Intent.ACTION_SENDTO, uri);

   4. startActivity(it);

   1. Intent it = new Intent(Intent.ACTION_SEND);

   2. it.putExtra(Intent.EXTRA_EMAIL, "me@abc.com");

   3. it.putExtra(Intent.EXTRA_TEXT, "The email body text");

   4. it.setType("text/plain");

   5. startActivity(Intent.createChooser(it, "Choose Email Client"));   

   1. Intent it=new Intent(Intent.ACTION_SEND);   

   2. String[] tos={"me@abc.com"};   

   3. String[] ccs={"you@abc.com"};   

   4. it.putExtra(Intent.EXTRA_EMAIL, tos);   

   5. it.putExtra(Intent.EXTRA_CC, ccs);   

   6. it.putExtra(Intent.EXTRA_TEXT, "The email body text");   

   7. it.putExtra(Intent.EXTRA_SUBJECT, "The email subject text");   

   8. it.setType("message/rfc822");   

   9. startActivity(Intent.createChooser(it, "Choose Email Client"));

 添加附件

   1. Intent it = new Intent(Intent.ACTION_SEND);

   2. it.putExtra(Intent.EXTRA_SUBJECT, "The email subject text");

   3. it.putExtra(Intent.EXTRA_STREAM, "file:///sdcard/mysong.mp3");

   4. sendIntent.setType("audio/mp3");

   5. startActivity(Intent.createChooser(it, "Choose Email Client"));

 播放多媒体

   1.   

   2. Intent it = new Intent(Intent.ACTION_VIEW);

   3. Uri uri = Uri.parse("file:///sdcard/song.mp3");

   4. it.setDataAndType(uri, "audio/mp3");

   5. startActivity(it);

   1. Uri uri = Uri.withAppendedPath(MediaStore.Audio.Media.INTERNAL_CONTENT_URI, "1");

   2. Intent it = new Intent(Intent.ACTION_VIEW, uri);

   3. startActivity(it);   

 Uninstall 程序

   1. Uri uri = Uri.fromParts("package", strPackageName, null);

   2. Intent it = new Intent(Intent.ACTION_DELETE, uri);

   3. startActivity(it);

 //调用相册

 public static final String MIME_TYPE_IMAGE_JPEG = "image/*";

 public static final int ACTIVITY_GET_IMAGE = 0;

 Intent getImage = new Intent(Intent.ACTION_GET_CONTENT); 

 getImage.addCategory(Intent.CATEGORY_OPENABLE); 

 getImage.setType(MIME_TYPE_IMAGE_JPEG);

 startActivityForResult(getImage, ACTIVITY_GET_IMAGE);

 //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);

 uninstall apk

 /**未测试

 Uri uninstallUri = Uri.fromParts("package", "xxx", null);

 returnIt = new Intent(Intent.ACTION_DELETE, uninstallUri);

 */

 Uri packageURI = Uri.parse("package:"+wistatmap);   

 Intent uninstallIntent = new Intent(Intent.ACTION_DELETE, packageURI);   

 startActivity(uninstallIntent);

 install apk

 Uri installUri = Uri.fromParts("package", "xxx", null);

 returnIt = new Intent(Intent.ACTION_PACKAGE_ADDED, installUri);

 play audio

 Uri playUri = Uri.parse("file:///sdcard/download/everything.mp3");

 returnIt = new Intent(Intent.ACTION_VIEW, playUri);

 //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"));

 //搜索应用

 Uri uri = Uri.parse("market://search?q=pname:pkg_name");   

 Intent it = new Intent(Intent.ACTION_VIEW, uri);   

 startActivity(it);   

 //where pkg_name is the full package path for an application

 //进入联系人页面

 Intent intent = new Intent();

 intent.setAction(Intent.ACTION_VIEW);

 intent.setData(People.CONTENT_URI);

 startActivity(intent);

 //查看指定联系人

 Uri personUri = ContentUris.withAppendedId(People.CONTENT_URI, info.id);//info.id联系人ID

 Intent intent = new Intent();

 intent.setAction(Intent.ACTION_VIEW);

 intent.setData(personUri);

 startActivity(intent);