This article describes the simple implementation of radar scanning effects by Android programming. Share it for your reference, as follows:
I saw an article about radar scanning in eoe, and then read it. It was very simple, but I felt that there were still many places to optimize. I posted it below
package ;
import ;
import ;
import ;
import ;
import ;
import ;
import ;
import ;
import ;
import ;
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();
}
private void initPaint() {
mPaintLine = new Paint();
(paintWidth);
(true);
();
(0xffff0000);
mPaintSector = new Paint();
(0x9D00ff00);
(true);
}
public void setViewSize(int size) {
= size;
mShader = new SweepGradient(viewSize >> 1, viewSize >> 1, , );
setMeasuredDimension(viewSize, viewSize);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
setMeasuredDimension(viewSize, viewSize);
}
public void start() {
();
isStart = true;
}
public void stop() {
if (isStart) {
();
isStart = false;
}
}
private Shader mShader = new SweepGradient(viewSize >> 1, viewSize >> 1, , );
private Matrix matrix = new Matrix();
@Override
protected void onDraw(Canvas canvas) {
(canvas);
int halfRadaSize = viewSize >> 1;
(halfRadaSize, halfRadaSize, halfRadaSize >> 1, mPaintLine);
(halfRadaSize, halfRadaSize, halfRadaSize - (paintWidth >> 1), mPaintLine);
(halfRadaSize, 0, halfRadaSize, viewSize, mPaintLine);
(0, halfRadaSize, viewSize, halfRadaSize, mPaintLine);
(mShader);
(matrix);
(halfRadaSize, halfRadaSize, halfRadaSize - paintWidth, mPaintSector);
}
protected class ScanThread extends Thread {
int halfRadaSize = viewSize >> 1;
@Override
public void run() {
while (isStart) {
start = start + 2;
();
(start, halfRadaSize, halfRadaSize);
postInvalidate();
try {
(10);
} catch (InterruptedException e) {
();
}
}
}
}
}
I hope this article will be helpful to everyone's Android programming design.