android-canvas

问题 I need to draw shapes just like those you would create with custom maps on Google Maps, using Android's MapView. In other words, if I draw a shape on the map, when I zoom out it should shrink, covering the same area of the map regardless of the zoom level. Example following the Android Reference: @Override public boolean draw(Canvas canvas, MapView mapView, boolean shadow, long when) { super.draw(canvas, mapView, shadow); //---translate the GeoPoint to screen pixels--- Point screenPts = new

问题 I need to draw shapes just like those you would create with custom maps on Google Maps, using Android's MapView. In other words, if I draw a shape on the map, when I zoom out it should shrink, covering the same area of the map regardless of the zoom level. Example following the Android Reference: @Override public boolean draw(Canvas canvas, MapView mapView, boolean shadow, long when) { super.draw(canvas, mapView, shadow); //---translate the GeoPoint to screen pixels--- Point screenPts = new

问题 I need to draw shapes just like those you would create with custom maps on Google Maps, using Android's MapView. In other words, if I draw a shape on the map, when I zoom out it should shrink, covering the same area of the map regardless of the zoom level. Example following the Android Reference: @Override public boolean draw(Canvas canvas, MapView mapView, boolean shadow, long when) { super.draw(canvas, mapView, shadow); //---translate the GeoPoint to screen pixels--- Point screenPts = new

问题 I need to draw shapes just like those you would create with custom maps on Google Maps, using Android's MapView. In other words, if I draw a shape on the map, when I zoom out it should shrink, covering the same area of the map regardless of the zoom level. Example following the Android Reference: @Override public boolean draw(Canvas canvas, MapView mapView, boolean shadow, long when) { super.draw(canvas, mapView, shadow); //---translate the GeoPoint to screen pixels--- Point screenPts = new

问题 I am trying to create canvas like the below image on the top SurfaceView using which i will open the camera This rectangular canvas should support every screen size in android and should be at center_vertical and center_horizontal of the screen with rest of the screen as translucent black as displayed in the image. I am very new with Canvas and have tried this: Java: package com.example.cameraapplication; import android.content.Context; import android.graphics.Canvas; import android.graphics

问题 I am trying to click only a rectangular portion of the screen from camera using this code: Java code: package com.example.cameraapplication; import androidx.appcompat.app.AppCompatActivity; import android.app.Activity; import android.content.Intent; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.hardware.Camera; import android.os.Bundle; import android.view.SurfaceHolder; import android.view.SurfaceView; import android.view.View; import android.widget

问题 I am trying to overlay a image in a specific position in the video so that i can combine both.But could not place the image to exact position selected.its moving somewhere else the final output. I am using this library to combine image and video https://github.com/MasayukiSuda/Mp4Composer-android (out of box Any other library suggestions)In this library i can set the image in 4 different positions: public enum Position { LEFT_TOP, LEFT_BOTTOM, RIGHT_TOP, RIGHT_BOTTOM } mp4Composer = new

问题 I am trying to overlay a image in a specific position in the video so that i can combine both.But could not place the image to exact position selected.its moving somewhere else the final output. I am using this library to combine image and video https://github.com/MasayukiSuda/Mp4Composer-android (out of box Any other library suggestions)In this library i can set the image in 4 different positions: public enum Position { LEFT_TOP, LEFT_BOTTOM, RIGHT_TOP, RIGHT_BOTTOM } mp4Composer = new

来源： https://stackoverflow.com/questions/11975636/how-to-draw-an-arrow-using-android-graphic-class

来源： https://stackoverflow.com/questions/11975636/how-to-draw-an-arrow-using-android-graphic-class