[Xamarin] Android 中 快照(Snapshot) View
2015-08-13
專案需求,順便筆記一下,將View進行快照,並且在ImageView 物件中顯示
範例說明: 上面是一個LinearLayout按下按鈕後,會將上方的LinearLayout 快照成Bitmap放在下方圖案
Layout Code:
<?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">
<LinearLayout
android:orientation="vertical"
android:minWidth="25px"
android:minHeight="25px"
android:layout_width="match_parent"
android:layout_height="250dp"
android:id="@+id/sampleContainer"
android:background="@drawable/ld">
<Button
android:text="測試"
android:layout_width="100dp"
android:layout_height="wrap_content"
android:id="@+id/button1" />
<Button
android:text="測試2"
android:layout_width="150dp"
android:layout_height="wrap_content"
android:id="@+id/button2"
android:background="#FF0000" />
</LinearLayout>
<Button
android:id="@+id/btnSnap"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="快照上方View" />
<ImageView
android:src="@android:drawable/ic_menu_gallery"
android:layout_width="match_parent"
android:layout_height="250dp"
android:id="@+id/imgResult" />
</LinearLayout>
Snapshot C# Code:
btnSnap.Click += delegate
{
var sample = FindViewById<LinearLayout>(Resource.Id.sampleContainer);
var img = SnapView(sample, sample.Width, sample.Height);
FindViewById<ImageView>(Resource.Id.imgResult).SetImageBitmap(img);
};
public static Bitmap SnapView(View v, int width, int height)
{
Bitmap bitmap;
v.DrawingCacheEnabled=(true);
bitmap = Bitmap.CreateBitmap(v.GetDrawingCache(true));
v.DrawingCacheEnabled=(false);
return bitmap;
}
Source: