グラフィックス(Graphics)を描画するには

android.graphicsパッケージ - Canvasクラスを使用します。

 

 

 

    * View.onDraw()をオーバーライドし、渡されたCanvasインスタンスを操作することでグラフィックスを描画できます。

 

 

 

サンプルソースコード

 

public class GraphicsTestActivity extends Activity {

    @Override

    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(new GraphicsTestView(this));

    }

 

    private class GraphicsTestView extends View {

        public GraphicsTestView(Context context) {

            super(context);

        }

 

        @Override

        protected void onDraw(Canvas canvas) {

            Paint paint = new Paint();

            paint.setColor(Color.argb(255, 255, 255, 255));

            canvas.drawLine(0, 0, 100, 50, paint);

        }

    }

}

 

android.graphics

Provides low level graphics tools such as canvases, color filters, points, and rectangles that let you handle drawing to the screen directly.

Classes

AvoidXfermode	AvoidXfermode xfermode will draw the src everywhere except on top of the opColor or, depending on the Mode, draw only on top of the opColor.
Bitmap
BitmapFactory	Creates Bitmap objects from various sources, including files, streams, and byte-arrays.
BitmapFactory.Options
BitmapRegionDecoder	BitmapRegionDecoder can be used to decode a rectangle region from an image.
BitmapShader	Shader used to draw a bitmap as a texture.
BlurMaskFilter	This takes a mask, and blurs its edge by the specified radius.
Camera	A camera instance can be used to compute 3D transformations and generate a matrix that can be applied, for instance, on a Canvas.
Canvas	The Canvas class holds the "draw" calls.
Color	The Color class defines methods for creating and converting color ints.
ColorFilter
ColorMatrix	5x4 matrix for transforming the color+alpha components of a Bitmap.
ColorMatrixColorFilter
ComposePathEffect
ComposeShader	A subclass of shader that returns the coposition of two other shaders, combined by an Xfermode subclass.
CornerPathEffect
DashPathEffect
DiscretePathEffect
DrawFilter	A DrawFilter subclass can be installed in a Canvas.
EmbossMaskFilter
ImageFormat
Interpolator
LayerRasterizer
LightingColorFilter
LinearGradient
MaskFilter	MaskFilter is the base class for object that perform transformations on an alpha-channel mask before drawing it.
Matrix	The Matrix class holds a 3x3 matrix for transforming coordinates.
Movie
NinePatch	The NinePatch class permits drawing a bitmap in nine sections.
Paint	The Paint class holds the style and color information about how to draw geometries, text and bitmaps.
Paint.FontMetrics	Class that describes the various metrics for a font at a given text size.
Paint.FontMetricsInt	Convenience method for callers that want to have FontMetrics values as integers.
PaintFlagsDrawFilter
Path	The Path class encapsulates compound (multiple contour) geometric paths consisting of straight line segments, quadratic curves, and cubic curves.
PathDashPathEffect
PathEffect	PathEffect is the base class for objects in the Paint that affect the geometry of a drawing primitive before it is transformed by the canvas' matrix and drawn.
PathMeasure
Picture	A picture records drawing calls (via the canvas returned by beginRecording) and can then play them back (via picture.draw(canvas) or canvas.drawPicture).
PixelFormat
PixelXorXfermode	PixelXorXfermode implements a simple pixel xor (op ^ src ^ dst).
Point	Point holds two integer coordinates
PointF	PointF holds two float coordinates
PorterDuff
PorterDuffColorFilter
PorterDuffXfermode
RadialGradient
Rasterizer
Rect	Rect holds four integer coordinates for a rectangle.
RectF	RectF holds four float coordinates for a rectangle.
Region
RegionIterator
Shader	Shader is the based class for objects that return horizontal spans of colors during drawing.
SumPathEffect
SurfaceTexture	Captures frames from an image stream as an OpenGL ES texture.
SweepGradient
Typeface	The Typeface class specifies the typeface and intrinsic style of a font.
Xfermode	Xfermode is the base class for objects that are called to implement custom "transfer-modes" in the drawing pipeline.
YuvImage	YuvImage contains YUV data and provides a method that compresses a region of the YUV data to a Jpeg.