通过 ContentResolver 读取联系人信息

1、首先动态获取 读取联系人信息权限

   <1>配置文件中声明对应权限

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

   <2>判断是否具有对应权限

     if (ContextCompat.checkSelfPermission(this, Manifest.permission.READ_CONTACTS) !=
             PackageManager.PERMISSION_GRANTED) {
         ActivityCompat.requestPermissions(this, arrayOf(Manifest.permission.READ_CONTACTS), 1)
     } else {
         readContacts()  //读取联系人信息
     }

  <3>授权

   override fun onRequestPermissionsResult(requestCode: Int, permissions: Array<out String>, grantResults: IntArray) {
        when (requestCode) {
            1 ->
                if (grantResults.size > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                    readContacts()
                } else {
                    Toast.makeText(this, "You denied the permission", Toast.LENGTH_SHORT).show()
                }
        }
    }

2、创建ListView适配器，联系人信息集合

  var adapter: ArrayAdapter<String>? = null
  var contactsList = mutableListOf<String>()

   //实例化 适配器
   adapter = ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, contactsList)
   //为listView 设置适配器
   lv_contents_view.adapter = adapter

3、读取联系人信息

    /**
     * 加载联系人信息
     */
    private fun readContacts() {
        var cursor: Cursor

        //查询联系人数据
        cursor = contentResolver.query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI,
                null, null, null, null)
        if (cursor != null) {
            while (cursor.moveToNext()) {
                //获取联系人姓名
                var displayName = cursor.getString(cursor.getColumnIndex(
                        ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME))
                //获取联系人电话
                var number = cursor.getString(cursor.getColumnIndex(
                        ContactsContract.CommonDataKinds.Phone.NUMBER))
                // 添加联系人信息到集合当中
                contactsList.add(displayName + "\n" + number)
            }
            //刷新 ListView
            adapter?.notifyDataSetChanged()
        }
        cursor.close()  //关闭 Cursor 对象
    }

4、成功显示数据

注意：编程所用语言为 Kotlin

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