1、说明

通过Xamarin.Android实现拨打电话的功能。VS2019社区版

2、效果实现

在这里插入图片描述

3、实现过程

3.1 Manifest配置

必须得有拨打电话的权限设定。

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android" android:versionCode="1" android:versionName="1.1" package="com.companyname.dialdemo" android:installLocation="auto"><uses-sdk android:minSdkVersion="24" android:targetSdkVersion="30" /><application android:allowBackup="true" android:icon="@mipmap/ic_launcher" android:label="@string/app_name" android:roundIcon="@mipmap/ic_launcher_round" android:supportsRtl="true" android:theme="@style/AppTheme"></application><uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" /><uses-permission android:name="android.permission.CALL_PHONE" />  <!--拨打电话的权限申请--><queries><intent><action android:name="android.intent.action.DIAL" />  <!--引用安卓的拨号功能--><data android:scheme="tel" /></intent></queries>
</manifest>

3.2 界面设置

layout_main.xml文件

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayoutxmlns:android="http://schemas.android.com/apk/res/android"xmlns:app="http://schemas.android.com/apk/res-auto"xmlns:tools="http://schemas.android.com/tools"android:layout_width="match_parent"android:layout_height="match_parent"><EditTextandroid:layout_width="158.0dp"android:layout_height="wrap_content"android:id="@+id/editText1"android:inputType="text" /><Buttonandroid:text="@string/dial_btn"android:layout_width="wrap_content"android:layout_height="wrap_content"android:minWidth="25px"android:minHeight="25px"android:id="@+id/button1" android:layout_below="@id/editText1"/><androidx.coordinatorlayout.widget.CoordinatorLayoutandroid:minWidth="25px"android:minHeight="25px"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_below="@id/button1"android:id="@+id/coordinatorLayout1"android:layout_centerVertical="true"android:layout_alignParentBottom="true"/></RelativeLayout>

3.3 String资源

String.xml的内容如下：

<resources><string name="app_name">DialDemo</string><string name="action_settings">Settings</string><string name="permission_call_phone">您是否同意授予拨打电话的权限</string><string name="ok">同意授予</string><string name="permission_available_call">已同意授权</string><string name="permissions_not_granted">未能授权</string><string name="dial_btn">拨打电话</string>
</resources>

3.4 具体实现

using Android;
using Android.App;
using Android.Content;
using Android.Content.PM;
using Android.OS;
using Android.Views;
using Android.Widget;
using AndroidX.AppCompat.App;
using AndroidX.CoordinatorLayout.Widget;
using AndroidX.Core.App;
using Google.Android.Material.Snackbar;
using System;namespace DialDemo
{[Activity(Label = "@string/app_name", Theme = "@style/AppTheme", MainLauncher = true)]public class MainActivity : AppCompatActivity{private Button dialBtn;private EditText phoneNo;private int REQUEST_LOCATION = 1;private CoordinatorLayout coordinatorLayout;protected override void OnCreate(Bundle savedInstanceState){base.OnCreate(savedInstanceState);Xamarin.Essentials.Platform.Init(this, savedInstanceState);// Set our view from the "main" layout resourceSetContentView(Resource.Layout.activity_main);dialBtn = FindViewById<Button>(Resource.Id.button1);phoneNo = FindViewById<EditText>(Resource.Id.editText1);coordinatorLayout = FindViewById<CoordinatorLayout>(Resource.Id.coordinatorLayout1);dialBtn.Click += DialBtn_Click;}//判断权限并进行授权public void checkAndGetPermission(){if (ActivityCompat.ShouldShowRequestPermissionRationale(this, Manifest.Permission.CallPhone)){var requiredPermissions = new String[] { Manifest.Permission.CallPhone };Snackbar.Make(coordinatorLayout,Resource.String.permission_call_phone,Snackbar.LengthIndefinite).SetAction(Resource.String.ok,new Action<View>(delegate (View obj){ActivityCompat.RequestPermissions(this, requiredPermissions, REQUEST_LOCATION);})).Show();}else{ActivityCompat.RequestPermissions(this, new String[] { Manifest.Permission.CallPhone }, REQUEST_LOCATION);}}//权限判断这儿public override void OnRequestPermissionsResult(int requestCode, string[] permissions, Permission[] grantResults){if (requestCode == REQUEST_LOCATION){if ((grantResults.Length == 1) && (grantResults[0] == Permission.Granted)) //若同意授权{Snackbar.Make(coordinatorLayout, Resource.String.permission_available_call, Snackbar.LengthShort).Show();call();}else //若不同意授权{Snackbar.Make(coordinatorLayout, Resource.String.permissions_not_granted, Snackbar.LengthShort).Show();}}else{base.OnRequestPermissionsResult(requestCode, permissions, grantResults);}}private void DialBtn_Click(object sender, System.EventArgs e){checkAndGetPermission();}//具体的电话的调用方法private void call(){try{var intent = new Intent(Intent.ActionCall);intent.SetData(Android.Net.Uri.Parse("tel:" + phoneNo.Text));StartActivity(intent);}catch (Exception e1){Toast.MakeText(this, e1.Message, ToastLength.Long).Show();}}}
}