ClipImageBorderView.java

package com.wisedu.scc.love.widget.image;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Paint.Style;
import android.util.AttributeSet;
import android.util.TypedValue;
import android.view.View;

/**
 * 剪辑图片边界VIEW控件
 */
public class ClipImageBorderView extends View{
	/**
	 * 水平方向与View的边距
	 */
	private int mHorizontalPadding;
	/**
	 * 垂直方向与View的边距
	 */
	private int mVerticalPadding;
	/**
	 * 绘制的矩形的宽度
	 */
	private int mWidth;
	/**
	 * 边框的颜色，默认为白色
	 */
	private int mBorderColor = Color.parseColor("#FFFFFF");
	/**
	 * 边框的宽度 单位dp
	 */
	private int mBorderWidth = 1;

	private Paint mPaint;

	public ClipImageBorderView(Context context) {
		this(context, null);
	}

	public ClipImageBorderView(Context context, AttributeSet attrs) {
		this(context, attrs, 0);
	}

	public ClipImageBorderView(Context context, AttributeSet attrs, int defStyle) {
		super(context, attrs, defStyle);
		mBorderWidth = (int) TypedValue.applyDimension(
				TypedValue.COMPLEX_UNIT_DIP, mBorderWidth, getResources()
						.getDisplayMetrics());
		mPaint = new Paint();
		mPaint.setAntiAlias(true); // 抗锯齿
	}

    /**
     * 渲染控件方法
     * @param canvas
     */
	@Override
	protected void onDraw(Canvas canvas) {
		super.onDraw(canvas);
		mWidth = getWidth() - 2 * mHorizontalPadding; // 计算矩形区域的宽度
		mVerticalPadding = (getHeight() - mWidth) / 2; // 计算距离屏幕垂直边界的边距
		mPaint.setColor(Color.parseColor("#aa000000")); // 设置画布颜色
		mPaint.setStyle(Style.FILL); // 设置画布风格
		/**绘制左边1*/
		canvas.drawRect(0, 0, mHorizontalPadding, getHeight(), mPaint);
		/**绘制右边2*/
		canvas.drawRect(getWidth() - mHorizontalPadding, 0, getWidth(),
				getHeight(), mPaint);
		/**绘制上边3*/
		canvas.drawRect(mHorizontalPadding, 0, getWidth() - mHorizontalPadding,
				mVerticalPadding, mPaint);
		/**绘制下边4*/
		canvas.drawRect(mHorizontalPadding, getHeight() - mVerticalPadding,
				getWidth() - mHorizontalPadding, getHeight(), mPaint);
		/**绘制中心框*/
		mPaint.setColor(mBorderColor);
		mPaint.setStrokeWidth(mBorderWidth);
		mPaint.setStyle(Style.STROKE);
		canvas.drawRect(mHorizontalPadding, mVerticalPadding, getWidth()
				- mHorizontalPadding, getHeight() - mVerticalPadding, mPaint);
	}

    /**
     * 设置水平Padding
     * @param mHorizontalPadding
     */
	public void setHorizontalPadding(int mHorizontalPadding) {
		this.mHorizontalPadding = mHorizontalPadding;
	}

}