Xamarin Android基本功能实现

Xamarin Android基本功能实现
前文已经配置好开发环境，接下来实现简单的扫描，拍照，相册，蓝牙，wifi，网络信息等基本功能。

主要目录
AndroidManifest.xml 应用权限管理
Main_axml 页面按钮等布局
MainActivity.cs 代码编辑页面

AndroidManifest.xml
注：版本号targetSdkVersion我的开始默认较高为27，写法有变动，调低为了21.

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android" android:versionCode="1" android:versionName="1.0" package="CIPHERLABRK25Test1.CIPHERLABRK25Test1" android:installLocation="auto">  <uses-sdk android:minSdkVersion="21" android:targetSdkVersion="21" />  <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />  <uses-permission android:name="android.permission.CAMERA" />  <uses-permission android:name="android.permission.FLASHLIGHT" />  <uses-permission android:name="android.permission.INTERNET" />  <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />  <uses-permission android:name="android.permission.CAPTURE_VIDEO_OUTPUT" />  <uses-permission android:name="android.permission.CAPTURE_SECURE_VIDEO_OUTPUT" />  <uses-permission android:name="android.permission.CAPTURE_AUDIO_OUTPUT" />  <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />  <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />  <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />  <uses-permission android:name="android.permission.MEDIA_CONTENT_CONTROL" />  <uses-permission android:name="android.permission.BLUETOOTH_PRIVILEGED" />  <uses-permission android:name="android.permission.BLUETOOTH" />  <uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />  <uses-permission android:name="android.permission.ACCESS_WIFI_STATE">uses-permission>  <uses-permission android:name="android.permission.CHANGE_WIFI_STATE">uses-permission>  <uses-permission android:name="android.permission.WAKE_LOCK">uses-permission>  <uses-permission android:name="android.permission.READ_CONTACTS" />  <uses-permission android:name="android.permission.WRITE_CONTACTS" />    <application android:allowBackup="true" android:icon="@mipmap/ic_launcher" android:label="app_name" android:roundIcon="@mipmap/ic_launcher_round" android:supportsRtl="true">application>manifest>

Main_axml

<?xml version="1.0" encoding="utf-8"?><GridLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="horizontal"    android:paddingLeft="10dp"    android:paddingRight="10dp"    android:rowCount="6"    android:columnCount="2">    <Button        android:id="@+id/camera"          android:layout_columnSpan="2"        android:layout_width="fill_parent"        android:text="打开摄像头" />    <Button        android:id="@+id/bluetooth"              android:layout_columnSpan="2"        android:layout_width="match_parent"        android:text="蓝牙" />    <Button        android:id="@+id/btnScanQRCode"        android:layout_columnSpan="2"        android:layout_width="match_parent"        android:text="扫描二维码" />    <Button        android:id="@+id/wifi"        android:layout_columnSpan="2"        android:layout_width="match_parent"        android:text="wifi" /><Button        android:id="@+id/net"        android:layout_columnSpan="2"        android:layout_width="match_parent"        android:text="显示网络信息" />    <Button        android:id="@+id/photo"        android:layout_columnSpan="2"        android:layout_width="match_parent"        android:text="打开相册" />     <ImageView        android:src="@android:drawable/ic_menu_gallery"        android:layout_width="fill_parent"        android:layout_height="50.0dp"        android:id="@+id/imageView1"        android:adjustViewBounds="true" /> <TextView        android:id="@+id/tvMachineCode"        android:layout_marginRight="5dp"        android:textSize="20sp"               android:text="" />    <EditText        android:id="@+id/txtMachineCode"        android:textSize="20sp"        android:maxLength="50"              android:layout_width="fill_parent" />GridLayout>

MainActivity.cs主要代码如下

using System;using Android.App;using Android.Bluetooth;using Android.Content;using Android.Net.Wifi;using Android.OS;using Android.Provider;using Android.Views;using Android.Widget;using Java.IO;using ZXing.Mobile;using Environment = Android.OS.Environment;using Uri = Android.Net.Uri;using Android.Support.V4.Content;using Context = Android.Content.Context;using Android.Runtime;using Android.Database;using Java.Util.Jar;using Plugin.Media;using Java.Lang;using String = System.String;using Android.Graphics;using System.Collections.Generic;using Android.Content.PM;using Android.Net;/* * FastAndroidCamera  2.0.0 * xamarin.android.support.v4  23.3.0 * Zxing.net 0.15 * zxing.net.mobile 2.2.9 * */namespace CIPHERLABRK25Test1{public static class App{    public static File _file;    public static File _dir;    public static Bitmap bitmap;}    [Activity(Label = "ZXing1", MainLauncher = true)]    public class MainActivity : Activity    {        private EditText txtMachineCode;        private Button Btnscanqrcode;        private Button TvActiviationCode;        private Button bluetooth;        private Button wifi;        private Button camera;        private Button net;        private Button photo;        //   private ImageView _imageView;        private ImageView iv;        protected override void OnCreate(Bundle bundle)        {            base.OnCreate(bundle);            MobileBarcodeScanner.Initialize(Application);            // Set our view from the "main" layout resource            SetContentView(Resource.Layout.Main);            txtMachineCode = FindViewById<EditText>(Resource.Id.txtMachineCode);            Btnscanqrcode = FindViewById<Button>(Resource.Id.btnScanQRCode);            bluetooth = FindViewById<Button>(Resource.Id.bluetooth);            wifi = FindViewById<Button>(Resource.Id.wifi);            camera = FindViewById<Button>(Resource.Id.camera);            photo = FindViewById<Button>(Resource.Id.photo);            iv = FindViewById<ImageView>(Resource.Id.imageView1);            net = FindViewById<Button>(Resource.Id.net);            Btnscanqrcode.Click += Btnscanqrcode_Click;            bluetooth.Click += bluetooth_Click;            wifi.Click += wifi_Click;            net.Click += net_Click;            photo.Click += photo_Click;            if (IsThereAnAppToTakePictures())            {                CreateDirectoryForPictures();                camera.Click += TakeAPicture; camera.Click += TakeAPicture;            }        }        private void net_Click(object sender, EventArgs e)        {            getCurrentNetType();        }        private void getCurrentNetType()        {            ConnectivityManager cm = (ConnectivityManager)GetSystemService(ConnectivityService);            if (cm.ActiveNetworkInfo == null || cm.ActiveNetworkInfo.Equals(""))            {                txtMachineCode.Text = "xxxx";            }            else            {                txtMachineCode.Text = cm.ActiveNetworkInfo.TypeName;            }        }        //获取图册        private void photo_Click(object sender, EventArgs e)        {            File originalFile = new Java.IO.File(Android.OS.Environment.GetExternalStoragePublicDirectory(                Android.OS.Environment.DirectoryPictures                ), "zcb_pic_" + SystemClock.CurrentThreadTimeMillis() + ".png");            Intent _intentCut = new Intent(Intent.ActionGetContent, null);            _intentCut.SetType("image/*");// 设置文件类型            _intentCut.PutExtra(MediaStore.ExtraOutput, Android.Net.Uri.FromFile(originalFile));            _intentCut.PutExtra(MediaStore.ExtraVideoQuality, 1);            StartActivityForResult(_intentCut, 0);        }        //拍照        private void TakeAPicture(object sender, EventArgs e)        {            Intent intent = new Intent(MediaStore.ActionImageCapture);            App._file = new File(App._dir, String.Format("myPhoto_{0}.jpg", Guid.NewGuid()));       //保存路径            intent.PutExtra(MediaStore.ExtraOutput, Uri.FromFile(App._file));            //   StartActivityForResult(intent, 0);            StartActivity(intent);        }        private void CreateDirectoryForPictures()        {            App._dir = new File(                Environment.GetExternalStoragePublicDirectory(                Environment.DirectoryPictures), "CIPHERLABRK25Test1");            if (!App._dir.Exists())            {                App._dir.Mkdirs();            }        }        private bool IsThereAnAppToTakePictures()        {            Intent intent = new Intent(MediaStore.ActionImageCapture);            IList<ResolveInfo> availableActivities = PackageManager.QueryIntentActivities(intent, PackageInfoFlags.MatchDefaultOnly);            return availableActivities != null && availableActivities.Count > 0;        }        //wifi        private void wifi_Click(object sender, EventArgs e)        {            WifiManager wifi = (WifiManager)GetSystemService(Context.WifiService);            WifiInfo w = wifi.ConnectionInfo;            //wifi信息            txtMachineCode.Text = w.MacAddress + "**" + w.IpAddress;            if (wifi.IsWifiEnabled)            {                wifi.SetWifiEnabled(false);            }            else            {                wifi.SetWifiEnabled(true);            }        }        //蓝牙        private void bluetooth_Click(object sender, System.EventArgs e)        {            BluetoothAdapter localAdapter = BluetoothAdapter.DefaultAdapter;            if (!localAdapter.IsEnabled)            {                localAdapter.Enable();            }            else            {                localAdapter.Disable();            }        }        //扫描二维码        private ZXingScannerFragment scanFragment;        private View zxingOverlay;        //public override View OnCreateView(LayoutInflater inflater, ViewGroup p1, Bundle p2)        //{        //    return inflater.Inflate(Resource.Layout.Scanner, null);        //}        private async void Btnscanqrcode_Click(object sender, System.EventArgs e)        {            var scanner = new ZXing.Mobile.MobileBarcodeScanner();            var result = await scanner.Scan();            if (result == null)            {                return;            }            txtMachineCode.Text = result.Text.Trim();        }        //图片显示        protected override void OnActivityResult(int requestCode, [GeneratedEnum] Result ResultStatus, Intent data)        {            if (ResultStatus == Result.Ok)            {                /*                * 若系统版本低于4.4，返回原uri                * 若高于4.4，解析uri后返回                * */                if (Android.OS.Build.VERSION.SdkInt >= BuildVersionCodes.Kitkat)                {                    var url = Android.Net.Uri.Parse("file://" + GetPath(BaseContext, data.Data));                    data.SetData(url);                    //将本地相册照片显示在控件上                    iv.SetImageURI(Android.Net.Uri.FromFile(new File(GetPath(BaseContext, data.Data))));                }            }        }        #region 高于 v4.4 版本 解析真实路径        public static String GetPath(Context context, Android.Net.Uri uri)        {            bool isKitKat = Build.VERSION.SdkInt >= BuildVersionCodes.Kitkat;            // DocumentProvider            if (isKitKat && DocumentsContract.IsDocumentUri(context, uri))            {                // ExternalStorageProvider                if (isExternalStorageDocument(uri))                {                    String docId = DocumentsContract.GetDocumentId(uri);                    String[] split = docId.Split(':');                    String type = split[0];                    if ("primary".Equals(type.ToLower()))                    {                        return Android.OS.Environment.ExternalStorageDirectory + "/" + split[1];                    }                    // TODO handle non-primary volumes                }                // DownloadsProvider                else if (isDownloadsDocument(uri))                {                    String id = DocumentsContract.GetDocumentId(uri);                    Android.Net.Uri contentUri = ContentUris.WithAppendedId(                            Android.Net.Uri.Parse("content://downloads/public_downloads"), long.Parse(id));                    return getDataColumn(context, contentUri, null, null);                }                // MediaProvider                else if (isMediaDocument(uri))                {                    String docId = DocumentsContract.GetDocumentId(uri);                    String[] split = docId.Split(':');                    String type = split[0];                    Android.Net.Uri contentUri = null;                    if ("image".Equals(type))                    {                        contentUri = MediaStore.Images.Media.ExternalContentUri;                    }                    else if ("video".Equals(type))                    {                        contentUri = MediaStore.Video.Media.ExternalContentUri;                    }                    else if ("audio".Equals(type))                    {                        contentUri = MediaStore.Audio.Media.ExternalContentUri;                    }                    String selection = "_id=?";                    String[] selectionArgs = new String[] {                    split[1]            };                    return getDataColumn(context, contentUri, selection, selectionArgs);                }            }            // MediaStore (and general)            else            if ("content".Equals(uri.Scheme.ToLower()))            {                // Return the remote address                if (isGooglePhotosUri(uri))                    return uri.LastPathSegment;                return getDataColumn(context, uri, null, null);            }            // File            else if ("file".Equals(uri.Scheme.ToLower()))            {                return uri.Path;            }            return null;        }        public static String getDataColumn(Context context, Android.Net.Uri uri, String selection,                String[] selectionArgs)        {            ICursor cursor = null;            String column = "_data";            String[] projection = {                column            };            try            {                cursor = context.ContentResolver.Query(uri, projection, selection, selectionArgs,                        null);                if (cursor != null && cursor.MoveToFirst())                {                    int index = cursor.GetColumnIndexOrThrow(column);                    return cursor.GetString(index);                }            }            finally            {                if (cursor != null)                    cursor.Close();            }            return null;        }        /**         * @param uri The Uri to check.         * @return Whether the Uri authority is ExternalStorageProvider.         */        public static bool isExternalStorageDocument(Android.Net.Uri uri)        {            return "com.android.externalstorage.documents".Equals(uri.Authority);        }        /**         * @param uri The Uri to check.         * @return Whether the Uri authority is DownloadsProvider.         */        public static bool isDownloadsDocument(Android.Net.Uri uri)        {            return "com.android.providers.downloads.documents".Equals(uri.Authority);        }        /**         * @param uri The Uri to check.         * @return Whether the Uri authority is MediaProvider.         */        public static bool isMediaDocument(Android.Net.Uri uri)        {            return "com.android.providers.media.documents".Equals(uri.Authority);        }        /**         * @param uri The Uri to check.         * @return Whether the Uri authority is Google Photos.         */        public static bool isGooglePhotosUri(Android.Net.Uri uri)        {            return "com.google.android.apps.photos.content".Equals(uri.Authority);        }        #endregion 高于 v4.4 版本 解析真实路径    }}

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