Android 自定义布局控件-圆形RelativeLayout

转自“姜徕”，原文链接：https://blog.csdn.net/jiang001002jay/article/details/61418338

效果图 ：

创建自定义类：CircleRelativeLayout.java

package com.jzy.circularlayout;import android.content.Context;import android.content.res.TypedArray;import android.graphics.Canvas;import android.graphics.Paint;import android.util.AttributeSet;import android.widget.RelativeLayout;public class CircleRelativeLayout extends RelativeLayout {    private int color;    private int[] colors;    private int alpha;    public CircleRelativeLayout(Context context) {        super(context);    }    public CircleRelativeLayout(Context context, AttributeSet attrs) {        super(context,attrs);        init(context,attrs);        setWillNotDraw(false);    }    private void init(Context context, AttributeSet attrs) {        TypedArray array = context.obtainStyledAttributes(attrs,                R.styleable.CircleRelativeLayoutLayout);        color = array.getColor(R.styleable.CircleRelativeLayoutLayout_background_color,0X0000000);        alpha = array.getInteger(R.styleable.CircleRelativeLayoutLayout_background_alpha,100);        setColors();        array.recycle();    }    @Override    protected void onDraw(Canvas canvas) { //构建圆形        int width = getMeasuredWidth();        Paint mPaint = new Paint();        mPaint.setARGB(alpha,colors[0],colors[1],colors[2]);        mPaint.setAntiAlias(true);        float cirX = width / 2;        float cirY = width / 2;        float radius = width / 2;        canvas.drawCircle(cirX, cirY, radius, mPaint);        super.onDraw(canvas);    }    public void setColor(int color) { //设置背景色        this.color = color;        setColors();        invalidate();    }    public void setAlhpa(int alhpa) { //设置透明度        this.alpha = alhpa;        invalidate();    }    public void setColors() {        int red = (color & 0xff0000) >> 16;        int green = (color & 0x00ff00) >> 8;        int blue = (color & 0x0000ff);        this.colors = new int[]{red,green,blue};    }}

添加自定义属性 values/attr.xml

<?xml version="1.0" encoding="utf-8"?>

布局文件

<?xml version="1.0" encoding="utf-8"?>

获取和设置控件

public class MainActivity extends Activity {    CircleRelativeLayout crlayout;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        crlayout = (CircleRelativeLayout) findViewById(R.id.crlayout);        crlayout.setColor(getResources().getColor(R.color.colorAccent));        crlayout.setAlhpa(160);    }}

Android 自定义布局控件-圆形RelativeLayout

Android 自定义布局控件-圆形RelativeLayout

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