C# Android：如何使用C代码中的位图刷新屏幕？
如何使用C代码中的位图刷新屏幕 我希望动态显示一个不断变化的位图，但我只看到最终的图像 我已经彻底搜索过了，但没有找到答案 为了了解情况，我在Visual Studio 2017中编写了一个noddy程序，该程序首先显示红色，然后显示蓝色，如下所示C# Android：如何使用C代码中的位图刷新屏幕？,c#,android,bitmap,android-imageview,C#,Android,Bitmap,Android Imageview,如何使用C代码中的位图刷新屏幕 我希望动态显示一个不断变化的位图，但我只看到最终的图像 我已经彻底搜索过了，但没有找到答案 为了了解情况，我在Visual Studio 2017中编写了一个noddy程序，该程序首先显示红色，然后显示蓝色，如下所示 protected override void OnCreate(Bundle bundle) { base.OnCreate(bundle); // Set our view from the "main" layout
protected override void OnCreate(Bundle bundle) {
base.OnCreate(bundle);
// Set our view from the "main" layout resource
SetContentView (Resource.Layout.Main);
// The imageView is needed to contain the drawing.
ImageView image_view = FindViewById<ImageView>(Resource.Id.imageView1);
// Create a new image bitmap
Bitmap drawBitmap = Bitmap.CreateBitmap(50, 100, Bitmap.Config.Rgb565);
drawBitmap.EraseColor(Color.Red);
// Attach the bitmap to the ImageView
image_view.SetImageBitmap(drawBitmap);
// Wait 2 seconds before changing the colour,
// to give time to see it.
TimeSpan delayTime = new TimeSpan(0, 0, 2); // 2 seconds
Task.Delay(delayTime).Wait();
// Change the color
drawBitmap.EraseColor(Color.Blue);
image_view.SetImageBitmap(drawBitmap);
int k = 0;
}
drawTime有谁能告诉我需要做些什么才能使这项工作正常进行，这样我才能在预期的延迟时间内看到连续的颜色吗？您可以调用
image\u view.SetImageBitmapimage\u viewHandlerRunnableRunimage\u view.SetImageBitmapimage\u viewHandlerRunnableRunpublic class MainActivity : Activity {
private Bitmap m_drawBitmap;
private ImageView m_image_view;
private int m_count = 0;
private static readonly Color[] colors = new Color[3] {Color.Red, Color.Green, Color.Blue };
protected override void OnCreate(Bundle bundle) {
base.OnCreate(bundle);
// Set our view from the "main" layout resource
SetContentView(Resource.Layout.Main);
// The imageView is needed to contain the drawing.
m_image_view = FindViewById<ImageView>(Resource.Id.imageView1);
// Create a new image bitmap
m_drawBitmap = Bitmap.CreateBitmap(50, 100, Bitmap.Config.Rgb565);
long frameStartTime = SystemClock.ElapsedRealtime();
Handler h = new Handler();
Action myAction = () =>
{
Console.WriteLine("Setting color index to {0}", m_count);
// the code that I want to delay goes here
m_drawBitmap.EraseColor(colors[(m_count++) % 3]);
// Attach the bitmap to the ImageView
m_image_view.SetImageBitmap(m_drawBitmap);
};
h.PostDelayed(myAction, 2000);
h.PostDelayed(myAction, 2000);
h.PostDelayed(myAction, 2000);
// time taken to draw it all in milli-secs
long drawTime = SystemClock.ElapsedRealtime() - frameStartTime;
Console.WriteLine("That took {0} ms", drawTime);
}
}