mono for android 获取手机照片或拍照并裁剪保存

axml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
<Button
    android:id="@+id/btn0"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="从相册中选择照片"
    />
  <Button
    android:id="@+id/btn1"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="拍照"
    />
  <ImageView
    android:id="@+id/imageID"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"

    />
</LinearLayout>

C#

using System;

using Android.App;
using Android.Content;
using Android.Widget;
using Android.OS;
using Android.Graphics;
using System.IO;

namespace Phoot
{
    [Activity(Label = "Phoot", MainLauncher = true, Icon = "@drawable/icon")]
    public class Activity1 : Activity
    {
        public static int NONE = 0;
        public static int PHOTOHRAPH = 1;//拍照
        public static int PHOTOXZOOM = 2;//缩放
        public static int PHOTORESOULT = 3;//结果

        public static string IMAGE_UNSPECTFIED = "image/*";

        ImageView imageview = null;
        Button button0 = null;
        Button button1 = null;
        protected override void OnCreate(Bundle bundle)
        {
            base.OnCreate(bundle);

            // Set our view from the "main" layout resource
            SetContentView(Resource.Layout.Main);

            button0 = FindViewById<Button>(Resource.Id.btn0);
            button1 = FindViewById<Button>(Resource.Id.btn1);
            imageview = FindViewById<ImageView>(Resource.Id.imageID);
            button0.Click += new EventHandler(button0_Click);
            button1.Click += new EventHandler(button1_Click);

        }
        //选择照片
        void button0_Click(object sender, EventArgs e)
        {
            Intent intent = new Intent(Intent.ActionPick, null);
            //选择照片意图
            intent.SetDataAndType(
             Android.Provider.MediaStore.Images.Media.ExternalContentUri, IMAGE_UNSPECTFIED);
            StartActivityForResult(intent, PHOTOXZOOM);
        }

        //拍照
        void button1_Click(object sender, EventArgs e)
        {

            Intent intent = new Intent(Android.Provider.MediaStore.ActionImageCapture);
            string file = System.IO.Path.Combine(Android.OS.Environment.ExternalStorageDirectory.ToString(),Android.OS.Environment.DirectoryDcim.ToString()+ "/test.jpg");

            var outputFileUri = Android.Net.Uri.Parse(file);
            intent.PutExtra(Android.Provider.MediaStore.ExtraOutput,file);
            StartActivityForResult(intent, PHOTOHRAPH);

        }

        protected override void OnActivityResult(int requestCode, Result resultCode, Intent data)
        {
            if (requestCode == NONE)
            {
                return;
            }
            if (requestCode == PHOTOHRAPH)
            {
                //获取照片
                Bitmap bitmap = (Bitmap)data.Extras.Get("data");
                 Java.IO.File picture = new Java.IO.File(Android.OS.Environment.ExternalStorageDirectory.ToString()+"/"+Android.OS.Environment.DirectoryDcim.ToString() + "/test.jpg");

                  //Java.IO.FileOutputStream b = new Java.IO.FileOutputStream(picture);
                  FileStream MyFileStream1 = new FileStream(picture.ToString(), FileMode.Create);
                //保存照片
                  bitmap.Compress(Bitmap.CompressFormat.Jpeg, 100, MyFileStream1);

                if (System.IO.File.Exists(picture.ToString()))
                {
                    startPhotoZoom(Android.Net.Uri.FromFile(picture));
                }

                //startPhotoZoom
            }
            if (data == null)
            {
                return;
            }
            if (requestCode == PHOTOXZOOM)
            {
                startPhotoZoom(data.Data);
            }
            //处理结果
            if (requestCode == PHOTORESOULT)
            {
                Bundle extras = data.Extras;
                if (extras != null)
                {
                    Bitmap photo = (Bitmap)extras.GetParcelable("data");

                    //Stream stream = null;
                    //压缩文件
                    //photo.Compress(Bitmap.CompressFormat.Jpeg, 75, stream);

                    imageview.SetImageBitmap(photo);
                }
            }

                    base.OnActivityResult(requestCode, resultCode, data);
        }

        //缩放
        public void startPhotoZoom(Android.Net.Uri uri)
        {

            Intent intent = new Intent("com.android.camera.action.CROP");
            intent.SetDataAndType(uri, IMAGE_UNSPECTFIED);

            intent.PutExtra("crop", true);
            //// aspectX aspectY 是宽高的比例
            intent.PutExtra("aspectX", 1);
            intent.PutExtra("aspectY", 1);
            //// outputX outputY 是裁剪图片宽?
            intent.PutExtra("outputX", 100);
            intent.PutExtra("outputY", 100);
            intent.PutExtra("return-data", true);
            StartActivityForResult(intent, PHOTORESOULT);

        }

    }
}

以前的我是没有做笔记的习惯的，学习了后觉得自己能记住，但是最近发现很多学的东西都忘记了，所有现在一有新的知识，就记下来吧。

最近又做一个mono for android 的项目 这次调整比较大，上次做的点餐系统很好用 ，但是做的时候没有做笔记很多东西都忘记了，这次我把项目涉及到的知识传到博客上，方便记忆，也很大家分享分享的，希望大家能给出点意见。——小査