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>

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);

}

}
}