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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