Android自定义View，单点触控小球，自定义Imageview圆形图片

自定义Line.java

package com.bawei.brush;

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

public class Line extends View {

    public Line(Context context) {
        super(context);
        // TODO Auto-generated constructor stub
    }

    public Line(Context context, AttributeSet attrs) {
        super(context, attrs);
        // TODO Auto-generated constructor stub
    }

    public Line(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        // TODO Auto-generated constructor stub
    }

    @Override
    protected void onDraw(Canvas canvas) {
        // TODO Auto-generated method stub
        super.onDraw(canvas);
        Paint paint = new Paint();//定义画笔
        paint.setColor(Color.RED);//画笔红色
        paint.setTextSize(20);//字体大小
        paint.setStrokeWidth(20);//设置线宽
        canvas.drawColor(Color.BLUE);//画板蓝色
        canvas.drawLine(20, 20, 200, 200, paint);//直线 1.开始X 2.开始Y 3.结束X 4.结束Y 5.画笔
        canvas.drawText("我是被画出来的", 10, 100, paint);//文字 1.显示文字 2.开始X 3.开始Y 4.画笔
        canvas.drawCircle(55, 55, 50, paint);//圆 1.圆心X 2.圆心Y 3.半径 4.画笔
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        // TODO Auto-generated method stub
        setMeasuredDimension(200, 200);//画板宽高
        // super.onMeasure(widthMeasureSpec, heightMeasureSpec);
    }

}

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity" >

    <com.bawei.brush.Line
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

</RelativeLayout>

单点触控小球

自定义Drawview.java

package com.bawei.brush;

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

public class Drawview extends View{
public float X=30;//刚进入位置
public float Y=30;

public Drawview(Context context, AttributeSet attrs) {
        super(context, attrs);
        // TODO Auto-generated constructor stub
}
 @Override
protected void onDraw(Canvas canvas) {
    // TODO Auto-generated method stub
    super.onDraw(canvas);
    Paint paint=new Paint();//定义画笔
    paint.setColor(Color.RED);//画笔颜色
    canvas.drawCircle(X, Y, 20, paint);//画小球
    
}
 
 @Override
public boolean onTouchEvent(MotionEvent event) {
    // TODO Auto-generated method stub
     //当前组件的X,Y
     this.X=event.getX();
     this.Y=event.getY();
     //通知该组件重绘
     this.invalidate();
    
    return true;
                    
}
}

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
     >

    <com.bawei.brush.Drawview
        android:id="@+id/tt"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
      
       />

</LinearLayout>

 

自定义圆形图片（图片来源用src）红色部分标示

加载本地图片用viewHolder.imageView.setImageResource(R.drawable.image);

自定义XCRoundImageView.java

package com.bawei.brush;



import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.PorterDuffXfermode;
import android.graphics.Rect;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.view.View;
import android.widget.ImageView;

/**
 * * 自定义的圆形ImageView，可以直接当组件在布局中使用。
 * 
 * @author caizhiming
 * */
public class XCRoundImageView extends ImageView {
    private Paint paint;

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

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

    public XCRoundImageView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        paint = new Paint();

    }

     @Override
        protected void onDraw(Canvas canvas) {
            // TODO Auto-generated method stub
            Drawable drawable = getDrawable();
     
            if (drawable == null) {
     
                return;
     
            }
     
            if (getWidth() == 0 || getHeight() == 0) {
     
                return;
     
            }
     
            Bitmap b = ((BitmapDrawable) drawable).getBitmap();
     
            if (null == b)
     
            {
     
                return;
     
            }
            Bitmap bitmap = b.copy(Bitmap.Config.ARGB_8888, true);
     
            // //获取图片的宽 高
     
            int w = getWidth(), h = getHeight();
     
            // 通过getCroppedBitmap函数，返回一个圆形图片
     
            Bitmap roundBitmap = getCroppedBitmap(bitmap, w);
     
            // 在自定义的CircleImageEx上展现
     
            canvas.drawBitmap(roundBitmap, 0, 0, null);
            /* super.onDraw(canvas); */
     
        }
     
        public static Bitmap getCroppedBitmap(Bitmap bmp, int radius) {
            Bitmap p;
            // 判断图片的大小与传入radius是否相等，如果不相等，那么
     
            // 将图片设置成长 宽都是radius的图片
     
            if (bmp.getWidth() != radius || bmp.getHeight() != radius)
     
                p = Bitmap.createScaledBitmap(bmp, radius, radius, false);
     
            else
     
                p = bmp;
     
            // 最后输出的图片信息
     
            Bitmap output = Bitmap.createBitmap(p.getWidth(),
     
            p.getHeight(), Config.ARGB_8888);
     
            Canvas canvas = new Canvas(output);
     
            final int color = 0xffa19774;
     
            final Paint paint = new Paint();
     
            final Rect rect = new Rect(0, 0, p.getWidth(), p.getHeight());
     
            // 画笔加上 抗锯齿标志，图像更加平滑
     
            paint.setAntiAlias(true);
     
            // 如果该项设置为true,则图像在动画进行中会滤掉对Bitmap图像的优化操作,加快显示
     
            paint.setFilterBitmap(true);
     
            // 防抖动
     
            paint.setDither(true);
     
            // 透明色
     
            canvas.drawARGB(0, 0, 0, 0);
     
            // 画笔的颜色
     
            paint.setColor(Color.parseColor("#BAB399"));
     
            // 画出一个圆形
     
            canvas.drawCircle(p.getWidth() / 2, p.getHeight() / 2,
     
            p.getWidth() / 2 + 0.1f, paint);
     
            // 设置两张图片相交时的模式 ，就是在画布上遮上圆形的图片信息
     
            paint.setXfermode(new PorterDuffXfermode(
                    android.graphics.PorterDuff.Mode.SRC_IN));
     
            canvas.drawBitmap(p, rect, rect, paint);
     
            return output;
     
        }
     
    }

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <com.bawei.brush.XCRoundImageView
        android:id="@+id/roundImageView"
        android:layout_width="50dp"
        android:layout_height="50dp"
        android:layout_centerInParent="true"
        android:src="@drawable/butterfly" />

</LinearLayout>