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, "[url=]file:///sdcard/mysong.mp3[/url]");    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("[url=]file:///sdcard/song.mp3[/url]");    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("[url=]file:///sdcard/download/everything.mp3[/url]");  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, "[url=]file:///sdcard/eoe.mp3[/url]");     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);