Uri number = Uri.parse("tel:10086");
 Intent callIntent = new Intent(Intent.ACTION_CALL, number);
 startActivity(callIntent);

<uses-permission android:name="android.permission.CALL_PHONE"/>

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

PackageManager packageManager = getPackageManager();
List<ResolveInfo> activities = packageManager.queryIntentActivities(intent, 0);

<uses-permission android:name="android.permission.READ_CONTACTS"/>

public static final int PICK_CONTACT_REQUEST = 1;

//这是拉起手机联系人列表
private void pickContact() {
 Intent pickContactIntent = new Intent(Intent.ACTION_PICK, Uri.parse("content://contacts"));
 pickContactIntent.setType(Phone.CONTENT_TYPE); // Show user only contacts w/ phone numbers
 startActivityForResult(pickContactIntent, PICK_CONTACT_REQUEST);
}

 @Override
 protected void onActivityResult(int requestCode, int resultCode, Intent data) {
 if (requestCode == 1) {
  if (resultCode == RESULT_OK) {
  Uri contactUri = data.getData();
  //如果需要别的信息,就在这里添加参数
  String[] projection = {ContactsContract.CommonDataKinds.Phone.NUMBER};
  Cursor cursor = getContentResolver()
   .query(contactUri, projection, null, null, null);
  //将游标移动到第一行
  cursor.moveToFirst();
  //返回列名对应的列的索引值
  int column = cursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER);
  //返回当前行指定列的值,这里就是电话
  String number = cursor.getString(column);
  Log.e("onActivityResult: ", number);
  }
 }
 }

private static final int PHONES_NUMBER_INDEX = 1;
private static final int PHONES_DISPLAY_NAME_INDEX = 0;
private static final int PHONES_CONTACT_ID_INDEX = 3;
private static final int PHONES_PHOTO_ID_INDEX = 2;

private void getPhoneContacts() {
 ContentResolver resolver = getContentResolver();

 String[] projection = {ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME,
  ContactsContract.CommonDataKinds.Phone.NUMBER,
  ContactsContract.CommonDataKinds.Photo.PHOTO_ID,
  ContactsContract.CommonDataKinds.Phone.CONTACT_ID,
//  "_id"
 };//COLLATE LOCALIZED
 Uri uri = ContactsContract.CommonDataKinds.Phone.CONTENT_URI;
 // 获取手机联系人
 Cursor phoneCursor = resolver.query(uri, projection, null, null, null);
 if (phoneCursor != null) {
  while (phoneCursor.moveToNext()) {
  //得到手机号码
  String phoneNumber = phoneCursor.getString(PHONES_NUMBER_INDEX);
  //当手机号码为空的或者为空字段 跳过当前循环
  if (TextUtils.isEmpty(phoneNumber))
   continue;
  //得到联系人名称
  String contactName = phoneCursor.getString(PHONES_DISPLAY_NAME_INDEX);
  //得到联系人ID
  Long contactid = phoneCursor.getLong(PHONES_CONTACT_ID_INDEX);
  //得到联系人头像ID
  Long photoid = phoneCursor.getLong(PHONES_PHOTO_ID_INDEX);
  //得到联系人头像Bitamp
  Bitmap contactPhoto = null;
  //photoid 大于0 表示联系人有头像 如果没有给此人设置头像则给他一个默认的
  if (photoid > 0) {
   Uri uri2 = ContentUris.withAppendedId(ContactsContract.Contacts.CONTENT_URI, contactid);
   InputStream input = ContactsContract.Contacts.openContactPhotoInputStream(resolver, uri2);
   contactPhoto = BitmapFactory.decodeStream(input);
  } else {
   contactPhoto = BitmapFactory.decodeResource(getResources(), R.mipmap.ic_launcher);
  }
  /**
   * 创建model类用于保存联系人信息
   */
  Log.e("getPhoneContacts: ", "--- " +phoneNumber +" --- "+ "--- "+contactName +" --- "+ contactid);
  }
  phoneCursor.close();
 }
 }