Intent intent;
			PackageManager packageMgr = getPackageManager();
			intent = packageMgr.getLaunchIntentForPackage("com.android.chrome");
            intent.setPackage(null); 
			intent.setAction(Intent.ACTION_VIEW);
			intent.addCategory(Intent.CATEGORY_DEFAULT);
			intent.setData(Uri.parse("http://www.xxx.com"));
			startActivity(intent);

Uri uri = Uri.parse("http://www.xxx.com");
			Intent intent = new Intent(Intent.ACTION_VIEW,uri);
			intent.setClassName("com.android.chrome","com.google.android.apps.chrome.Main");//打开chrome浏览器
			startActivity(intent);