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| import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.RectF;
import android.os.Build;
import android.support.annotation.Nullable;
import android.support.annotation.RequiresApi;
import android.util.AttributeSet;
import android.view.View;
import com.zjkq.highnet_jt.R;
import java.util.ArrayList;
import java.util.List;
public class StarBgView extends View {
private int bgColor;
private int starColor;
private int starQty;
private Paint starPaint;
private boolean hasInit;
private List<StarData> stars;
private static class StarData {
private int alpha;
private int x;
private int y;
private int color;
private RectF rect;
public RectF getRect() {
return rect;
}
public void setRect(RectF rect) {
this.rect = rect;
}
public int getAlpha() {
return alpha;
}
public void setAlpha(int alpha) {
this.alpha = alpha;
}
public int getX() {
return x;
}
public void setX(int x) {
this.x = x;
}
public int getY() {
return y;
}
public void setY(int y) {
this.y = y;
}
public int getColor() {
return color;
}
public void setColor(int color) {
this.color = color;
}
}
public StarBgView(Context context) {
super(context);
init(context, null);
}
public StarBgView(Context context, @Nullable AttributeSet attrs) {
super(context, attrs);
init(context, attrs);
}
public StarBgView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init(context, attrs);
}
@RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
public StarBgView(Context context, @Nullable AttributeSet attrs, int defStyleAttr, int defStyleRes) {
super(context, attrs, defStyleAttr, defStyleRes);
init(context, attrs);
}
private void init(Context context, AttributeSet attrs) {
if (attrs != null) {
TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.StarBgView);
bgColor = a.getColor(R.styleable.StarBgView_sbv_bg_color, 0xff0a224a);
starColor = a.getColor(R.styleable.StarBgView_sbv_star_color, 0xffffffff);
starQty = a.getInteger(R.styleable.StarBgView_sbv_star_qty, 50);
a.recycle();
} else {
bgColor = 0xff0a224a;
starColor = 0xffffffff;
starQty = 50;
}
initPaint();
setBackgroundColor(bgColor);
}
private void generateStarData() {
if (stars != null) {
stars.clear();
stars = null;
}
stars = new ArrayList<>();
for (int i = 0; i < starQty; i++) {
int x = getRandomX();
int y = getRandomY();
int alpha = getRandomAlpha();
StarData starData = new StarData();
starData.setX(x);
starData.setY(y);
starData.setAlpha(alpha);
if (i % 2 == 0) {
starData.setRect(new RectF(x, y, x + 1, y + 2));
} else {
starData.setRect(new RectF(x, y, x + 2, y + 1));
}
stars.add(starData);
}
}
private int getRandomAlpha() {
return (int) (255 * Math.random() + 0.5f);
}
private int getRandomX() {
return (int) (getWidth() * Math.random() + 0.5f);
}
private int getRandomY() {
return (int) (getHeight() * Math.random() + 0.5f);
}
private void drawStar(Canvas canvas) {
if (stars != null) {
for (StarData star : stars) {
starPaint.setAlpha(star.getAlpha());
canvas.drawRoundRect(star.getRect(), 1, 1, starPaint);
}
}
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
if (stars == null) {
generateStarData();
}
drawStar(canvas);
}
private void initPaint() {
starPaint = new Paint();
starPaint.setColor(starColor);
starPaint.setStyle(Paint.Style.FILL);
starPaint.setAntiAlias(true);
starPaint.setStrokeWidth(1);
}
}
|
