The example in this article describes the simple implementation of radar scanning effect through Android programming. I share it with you for your reference. The details are as follows:
I saw an article about radar scanning in eoe, and then read it. It is very simple, but I think there are still many places that can be optimized. I will post it below
package com.example.wave; import android.content.Context; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Matrix; import android.graphics.Paint; import android.graphics.Paint.Style; import android.graphics.Shader; import android.graphics.SweepGradient; import android.util.AttributeSet; import android.widget.FrameLayout; public class RadarView extends FrameLayout { private int viewSize = 500; private Paint mPaintLine; private Paint mPaintSector; private boolean isStart = false; private ScanThread mThread; private int start = 0; private final int paintWidth = 10; public RadarView(Context context) { super(context); init(); } public RadarView(Context context, AttributeSet attrs) { super(context, attrs); init(); } private void init() { initPaint(); mThread = new ScanThread(); setBackgroundColor(Color.TRANSPARENT); } private void initPaint() { mPaintLine = new Paint(); mPaintLine.setStrokeWidth(paintWidth); mPaintLine.setAntiAlias(true); mPaintLine.setStyle(Style.STROKE); mPaintLine.setColor(0xffff0000); mPaintSector = new Paint(); mPaintSector.setColor(0x9D00ff00); mPaintSector.setAntiAlias(true); } public void setViewSize(int size) { this.viewSize = size; mShader = new SweepGradient(viewSize >> 1, viewSize >> 1, Color.TRANSPARENT, Color.GREEN); setMeasuredDimension(viewSize, viewSize); } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { setMeasuredDimension(viewSize, viewSize); } public void start() { mThread.start(); isStart = true; } public void stop() { if (isStart) { Thread.interrupted(); isStart = false; } } private Shader mShader = new SweepGradient(viewSize >> 1, viewSize >> 1, Color.TRANSPARENT, Color.GREEN); private Matrix matrix = new Matrix(); @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); int halfRadaSize = viewSize >> 1; canvas.drawCircle(halfRadaSize, halfRadaSize, halfRadaSize >> 1, mPaintLine); canvas.drawCircle(halfRadaSize, halfRadaSize, halfRadaSize - (paintWidth >> 1), mPaintLine); canvas.drawLine(halfRadaSize, 0, halfRadaSize, viewSize, mPaintLine); canvas.drawLine(0, halfRadaSize, viewSize, halfRadaSize, mPaintLine); mPaintSector.setShader(mShader); canvas.concat(matrix); canvas.drawCircle(halfRadaSize, halfRadaSize, halfRadaSize - paintWidth, mPaintSector); } protected class ScanThread extends Thread { int halfRadaSize = viewSize >> 1; @Override public void run() { while (isStart) { start = start + 2; matrix.reset(); matrix.postRotate(start, halfRadaSize, halfRadaSize); postInvalidate(); try { Thread.sleep(10); } catch (InterruptedException e) { e.printStackTrace(); } } } } }
I hope this article will be helpful to everyone in Android programming.
For more articles related to Android programming to simply implement radar scanning effects, please pay attention to the PHP Chinese website!

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