xamarin.Android 选择本地图片、拍摄图片、剪裁图片

[Activity(Theme = "@style/MyStyleBottom")]
public class SelectPicPopupWindow : Activity, IOnClickListener
{
private const int Display_RequestCode = 0xa1;
private const int Camera_RequestCode = 0xa2;
private const int PhotoGallery_RequestCode = 0xa3; private Java.IO.File finalFile;
private Java.IO.File originalFile; protected override void OnCreate(Bundle savedInstanceState)
{
//竖屏显示
RequestedOrientation = Android.Content.PM.ScreenOrientation.Portrait; base.OnCreate(savedInstanceState);
SetContentView(Resource.Layout.SelectPicPopupWindow); originalFile = new Java.IO.File(Android.OS.Environment.GetExternalStoragePublicDirectory(
Android.OS.Environment.DirectoryPictures
), "zcb_pic_" + SystemClock.CurrentThreadTimeMillis() + ".png");
finalFile = new Java.IO.File(Android.OS.Environment.GetExternalStoragePublicDirectory(
Android.OS.Environment.DirectoryPictures
), "zcb_pic_" + SystemClock.CurrentThreadTimeMillis() + ".png"); var btn_take_photo = this.FindViewById<Button>(Resource.Id.btn_take_photo);
var btn_pick_photo = this.FindViewById<Button>(Resource.Id.btn_pick_photo);
var btn_cancel = this.FindViewById<Button>(Resource.Id.btn_cancel); btn_take_photo.SetOnClickListener(this);
btn_pick_photo.SetOnClickListener(this);
btn_cancel.SetOnClickListener(this); var windowManager = WindowManager;
var windowManagerLayoutParams = Window.Attributes;
var displayMetrics = new Android.Util.DisplayMetrics();
windowManager.DefaultDisplay.GetMetrics(displayMetrics);
windowManagerLayoutParams.Width = (int)(displayMetrics.WidthPixels * ); // 宽度设置
Window.Attributes = windowManagerLayoutParams;
} public void OnClick(View v)
{
switch (v.Id)
{
case Resource.Id.btn_take_photo:
try
{
// 摄像头拍摄
CutImageByCamera();
}
catch (Exception ex)
{
Toast.MakeText(this, "App Camera Error:" + ex.InnerException, ToastLength.Short).Show();
}
break;
case Resource.Id.btn_pick_photo:
try
{
// 相册选择
CutImageByImgStore();
}
catch (Exception ex)
{
Toast.MakeText(this, "App Select Photo Gallery Error:" + ex.InnerException, ToastLength.Short).Show();
}
break;
case Resource.Id.btn_cancel:
default: Finish(); break;
}
} public override bool OnTouchEvent(MotionEvent e)
{
Finish();
return base.OnTouchEvent(e);
} protected override void OnActivityResult(int requestCode, [GeneratedEnum] Result ResultStatus, Intent data)
{
if (ResultStatus == Result.Ok)
{
if (requestCode == Display_RequestCode)// 显示结果
{
Intent intent = new Intent();
intent.SetData(Android.Net.Uri.FromFile(finalFile));
SetResult(Result.Ok, intent);
Finish();
}
if (requestCode == Camera_RequestCode) //摄像头 剪裁
{
CropRawPhoto(Android.Net.Uri.FromFile(originalFile));
}
if (requestCode == PhotoGallery_RequestCode)// 选择图片 剪裁
{
/*
* 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);
} CropRawPhoto(data.Data);
}
}
} /// <summary>
/// 调用摄像头拍摄
/// </summary>
private void CutImageByCamera()
{
Intent getImageByCamera = new Intent("android.media.action.IMAGE_CAPTURE");
getImageByCamera.PutExtra(MediaStore.ExtraOutput, Android.Net.Uri.FromFile(originalFile));
getImageByCamera.PutExtra(MediaStore.ExtraVideoQuality, );
StartActivityForResult(getImageByCamera, Camera_RequestCode);
} /// <summary>
/// 调用相册选择
/// </summary>
private void CutImageByImgStore()
{
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, ); StartActivityForResult(_intentCut, PhotoGallery_RequestCode);
} /// <summary>
/// 剪裁图片
/// </summary>
/// <param name="uri"></param>
public void CropRawPhoto(Android.Net.Uri uri)
{
if (!HasSdcard)
{
Toast.MakeText(this, "无法存储截取后的图片", ToastLength.Short).Show();
return;
} Intent _intentCut = new Intent("com.android.camera.action.CROP");
_intentCut.SetDataAndType(uri, "image/*");
_intentCut.PutExtra("crop", "true");
// aspectX , aspectY :宽高的比例
_intentCut.PutExtra("aspectX", );
_intentCut.PutExtra("aspectY", );
// outputX , outputY : 裁剪图片宽高
_intentCut.PutExtra("outputX", "");
_intentCut.PutExtra("outputY", "");
_intentCut.PutExtra(MediaStore.ExtraVideoQuality, );
_intentCut.PutExtra(MediaStore.ExtraOutput, Android.Net.Uri.FromFile(finalFile));
StartActivityForResult(_intentCut, Display_RequestCode);
} /// <summary>
/// 检查设备是否存在SDCard的工具方法
/// </summary>
/// <returns></returns>
public static bool HasSdcard
{
get
{
String state = Android.OS.Environment.ExternalStorageState;
if (state.Equals(Android.OS.Environment.MediaMounted))
return true;
else
return false;
}
} #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[]; if ("primary".Equals(type.ToLower()))
{
return Android.OS.Environment.ExternalStorageDirectory + "/" + split[];
} // 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[]; 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[]
}; 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;
} /**
* Get the value of the data column for this Uri. This is useful for
* MediaStore Uris, and other file-based ContentProviders.
*
* @param context The context.
* @param uri The Uri to query.
* @param selection (Optional) Filter used in the query.
* @param selectionArgs (Optional) Selection arguments used in the query.
* @return The value of the _data column, which is typically a file path.
*/
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 }