特别推荐:
使用Android自带Gallery组件实现CoverFlow,源码+解析
http://www.eoeandroid.com/thread-39709-1-1.html
android平台水波效果!
http://www.eoeandroid.com/thread-263-1-1.html
对“中文天气预报”代码全注释(带有详细注解)
http://www.eoeandroid.com/thread-40558-1-1.html
这里就不做什么特别的说明了,源码里面说的很清楚。还是直接代码吧!
package com.view; import com.test.R; import android.view.View; import android.content.Context; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import android.graphics.RectF; import android.graphics.Path; import android.graphics.Shader; import android.graphics.LinearGradient; /* 自定义继承View 的MyView*/ public class BasicViewDraw extends View { public BasicViewDraw(Context context) { super(context); } /* 重写onDraw() */ @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); /* 设置背景为白色 */ canvas.drawColor(Color.WHITE); Paint paint = new Paint(); /* 去锯齿 */ paint.setAntiAlias(true); /* 设置paint的颜色 */ paint.setColor(Color.RED); /* 设置paint的 style 为STROKE:空心 */ paint.setStyle(Paint.Style.STROKE); /* 设置paint的外框宽度 */ paint.setStrokeWidth(3); /* 画一个空心圆形 */ canvas.drawCircle(40, 40, 30, paint); /* 画一个空心正方形 */ canvas.drawRect(10, 90, 70, 150, paint); /* 画一个空心长方形 */ canvas.drawRect(10, 170, 70, 200, paint); /* 画一个空心椭圆形 */ RectF re = new RectF(10, 220, 70, 250); canvas.drawOval(re, paint); /* 画一个空心三角形 */ Path path = new Path(); path.moveTo(10, 330); path.lineTo(70, 330); path.lineTo(40, 270); path.close();//记得要close canvas.drawPath(path, paint); /* 画一个空心梯形 */ Path path1 = new Path(); path1.moveTo(10, 410); path1.lineTo(70, 410); path1.lineTo(55, 350); path1.lineTo(25, 350); path1.close(); canvas.drawPath(path1, paint); /* 设置paint 的style为 FILL:实心 */ paint.setStyle(Paint.Style.FILL); /* 设置paint的颜色 */ paint.setColor(Color.BLUE); /* 画一个实心圆 */ canvas.drawCircle(120, 40, 30, paint); /* 画一个实心正方形 */ canvas.drawRect(90, 90, 150, 150, paint); /* 画一个实心长方形 */ canvas.drawRect(90, 170, 150, 200, paint); /* 画一个实心椭圆 */ RectF re2 = new RectF(90, 220, 150, 250); canvas.drawOval(re2, paint); /* 画一个实心三角形 */ Path path2 = new Path(); path2.moveTo(90, 330); path2.lineTo(150, 330); path2.lineTo(120, 270); path2.close(); canvas.drawPath(path2, paint); /* 画一个实心梯形 */ Path path3 = new Path(); path3.moveTo(90, 410); path3.lineTo(150, 410); path3.lineTo(135, 350); path3.lineTo(105, 350); path3.close(); canvas.drawPath(path3, paint); /* 设置渐变色 */ Shader mShader = new LinearGradient(0, 0, 100, 100, new int[] { Color.RED, Color.GREEN, Color.BLUE, Color.YELLOW }, null, Shader.TileMode.REPEAT); paint.setShader(mShader); /* 画一个渐变色圆 */ canvas.drawCircle(200, 40, 30, paint); /* 画一个渐变色正方形 */ canvas.drawRect(170, 90, 230, 150, paint); /* 画一个渐变色长方形 */ canvas.drawRect(170, 170, 230, 200, paint); /* 画一个渐变色椭圆 */ RectF re3 = new RectF(170, 220, 230, 250); canvas.drawOval(re3, paint); /* 画一个渐变色三角形 */ Path path4 = new Path(); path4.moveTo(170, 330); path4.lineTo(230, 330); path4.lineTo(200, 270); path4.close(); canvas.drawPath(path4, paint); /* 画一个渐变色梯形 */ Path path5 = new Path(); path5.moveTo(170, 410); path5.lineTo(230, 410); path5.lineTo(215, 350); path5.lineTo(185, 350); path5.close(); canvas.drawPath(path5, paint); /* 写字 */ paint.setTextSize(24); canvas.drawText(getResources().getString(R.string.str_text1), 240, 50,paint); canvas.drawText(getResources().getString(R.string.str_text2), 240, 120,paint); canvas.drawText(getResources().getString(R.string.str_text3), 240, 190,paint); canvas.drawText(getResources().getString(R.string.str_text4), 240, 250,paint); canvas.drawText(getResources().getString(R.string.str_text5), 240, 320,paint); canvas.drawText(getResources().getString(R.string.str_text6), 240, 390,paint); } }
class BasicView2Draw extends View{ Paint paint; Bitmap bitmap; public BasicView2Draw(Context context) { super(context); paint = new Paint(Paint.ANTI_ALIAS_FLAG); bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.icon); } private Bitmap createBitmap1(){ Bitmap bitmap1 = Bitmap.createBitmap(100, 100, Config.ARGB_8888); Canvas canvas = new Canvas(bitmap1); canvas.drawColor(Color.BLUE); // canvas.drawARGB(0, 0, 0, 0);// 透明色 canvas.drawBitmap(bitmap, 0, 0, paint); canvas.drawText("Hello Android", 25, 55, paint); return bitmap1; } @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); // 绘制位图 // 1.绘制位图在(10,10)位置上 canvas.drawBitmap(createBitmap1(), 10, 10, paint); // 2. canvas.drawBitmap(Bitmap bitmap,Rect src,Rect dest,Paint paint); // canvas.drawBitmap(Bitmap bitmap,Rect src,RectF dest,Paint paint); // 绘制位图到一个指定的矩形dest中,位图会自动进行平移和缩放等操作,如果src的参数不为null // 则会裁剪位图的部分区域来进行绘制 Rect rect = new Rect(10, 10, 50, 60); RectF rectF1 = new RectF(180.0f, 20.0f, 240.0f, 80.0f); RectF rectF2 = new RectF(180.0f, 100.0f, 240.0f, 160.0f); canvas.drawBitmap(createBitmap1(), null, rectF1, paint); canvas.drawBitmap(createBitmap1(), rect, rectF2, paint); // 点 paint.setStyle(Paint.Style.FILL_AND_STROKE); paint.setStrokeWidth(5.0f); paint.setColor(Color.YELLOW); canvas.drawPoints(new float[]{120,120,140,140,160,160,180,180}, paint); // 线 paint.reset();// 重置画笔 paint.setColor(Color.GREEN); paint.setAntiAlias(true); canvas.drawLine(30, 30, 130, 40, paint); paint.setColor(Color.RED); canvas.drawLines(new float[]{ 40,40,140,40 ,50,50,90,90 }, paint); // 矩形 paint.setColor(Color.CYAN); canvas.drawRect(10, 150, 150, 250, paint); paint.setColor(Color.GRAY); canvas.drawRect(new Rect(10, 260, 150, 280), paint); paint.setColor(Color.DKGRAY); canvas.drawRect(new RectF(20.2f, 290.9f, 120.2f, 300.3f), paint); // 绘制文本 // paint.setTextSize(20); // paint.setColor(0x40ffffff);// 半透明白色 // paint.setTextAlign(Paint.Align.RIGHT);// 对齐方向 // canvas.drawText("Cool Android", 250, 180, paint);// 这里注意,坐标(180,180)是文本的左下点坐标 // 画布平移: // 平移的单位是像素,分别是在x,y轴上平移的像素点 // 正数代表的正方向,x轴为平面的右侧,y轴为平面的下方,相应的,负数则向反方向平移 // canvas.translate(30.0f, 30.0f); // 画布缩放: // 参数分别是在想x,y轴上放大或缩小的倍数,大雨1为放大,小于1为缩小, // 缩放的原点默认为画布的原点(0,0),也可以指定缩放的原点 // canvas.scale(2.0f, 1.5f); // canvas.scale(0.5f, 0.5f, 100.0f, 100.0f);// 指定坐标(100.0f,100.0f)为缩放原点 // 这里剖析一下第二个缩放方法,其实系统为我们做的事情是这样的 /* scale(float sx, float sy, float px, float py){ translate(px,py); scale(sx,sy); translate(-px,-py); } */ // 画布旋转 // 1.以画布为原点,顺时针旋转40.0f度 // canvas.rotate(40.0f); // 2.以(100.11f, 100.22f)为原点,顺时针旋转50.0f度 // canvas.rotate(50.0f, 100.11f, 100.22f); // 相应的,为了加深理解,我们再剖析一下第二个旋转方法 // ,其实系统为我们做的事情是这样的 /* rotate(float degrees, float px, float py){ translate(px,py); rotate(degrees); translate(-px,-py); } */ // 画布倾斜 // skew(float sx,float xy);将画布在x及y轴方向上倾斜相应的角度,sx或sy为倾斜角度的tan值, // 如canvas.skew(1,0);为在x方向上倾斜45度 >> tan(45) = 1 // canvas.skew(1,0); } }
package com.view; import android.content.Context; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import android.graphics.Path; import android.graphics.Region; import android.util.AttributeSet; import android.view.View; /** * ---------------------------------------------------矩形区域------------------------------------------------- * canvas.clipRect(左上角x轴坐标, 左上角y轴坐标, 右下角x轴坐标, 右下角y轴坐标, Region.Op.XOR); * 最后一个参数有多个选择分别是: * //DIFFERENCE是第一次不同于第二次的部分显示出来 //REPLACE是显示第二次的 //REVERSE_DIFFERENCE 是第二次不同于第一次的部分显示 //INTERSECT:交集显示 //UNION:全部显示 //XOR补集,就是全集的减去交集剩余部分显示 * @author emmet1988.iteye.com * */ public class ClipRectDraw extends View { Context context; Paint paint; Path path; public ClipRectDraw(Context context) { super(context); init(); } public ClipRectDraw(Context context, AttributeSet attrs) { super(context, attrs); init(); } public ClipRectDraw(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); init(); } private void init(){ paint = new Paint(); paint.setAntiAlias(true); paint.setStrokeWidth(5); paint.setTextSize(15); paint.setTextAlign(Paint.Align.RIGHT); path = new Path(); } @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); canvas.drawColor(Color.GRAY); //左上图 canvas.save(); canvas.translate(10, 10); drawScene(canvas); canvas.restore(); //右上图 canvas.save(); canvas.translate(160, 10); canvas.clipRect(10, 10, 90, 90); canvas.clipRect(30, 30, 70, 70, Region.Op.XOR); drawScene(canvas); canvas.restore(); //左中图 canvas.save(); canvas.translate(10, 130); path.reset(); /*抛物曲线*/ path.cubicTo(0, 0, 100, 0, 100, 100); path.cubicTo(100, 100, 0, 100, 0, 0); canvas.clipPath(path, Region.Op.REPLACE); drawScene(canvas); canvas.restore(); //右中图 canvas.save(); canvas.translate(160, 130); canvas.clipRect(0, 0, 60, 60); canvas.clipRect(40, 40, 100, 100, Region.Op.UNION); drawScene(canvas); canvas.restore(); //左下图 canvas.save(); canvas.translate(10, 250); canvas.clipRect(0, 0, 60, 60); canvas.clipRect(40, 40, 100, 100, Region.Op.XOR); drawScene(canvas); canvas.restore(); //右下图 canvas.translate(160, 250); canvas.clipRect(0, 0, 60, 60); canvas.clipRect(40, 40, 100, 100, Region.Op.REVERSE_DIFFERENCE); drawScene(canvas); canvas.restore(); } private void drawScene(Canvas canvas){ canvas.clipRect(0, 0, 100, 100); canvas.drawColor(Color.WHITE); paint.setColor(Color.RED); canvas.drawLine(0, 0, 100, 100, paint); paint.setColor(Color.GREEN); canvas.drawCircle(30, 70, 30, paint); paint.setColor(Color.BLUE); canvas.drawText("ChenJianLi", 100, 30, paint); } }
package com.view; import com.test.R; import android.content.Context; import android.graphics.Bitmap; import android.graphics.Canvas; import android.graphics.Matrix; import android.graphics.Paint; import android.graphics.drawable.BitmapDrawable; import android.view.View; /** * 在 Android 里面, Matrix 由 9 个 float 值构成,是一个 3*3 的矩阵。 * cosX, -sinX,translateX * sinX, cosX,translateY * 0, 0, scale * 解释一下,上面的 sinX 和 cosX ,表示旋转角度的 cos 值和 sin 值,注意, * 旋转角度是按顺时针方向计算的。 translateX 和 translateY 表示 x 和 y 的平移量。 * scale 是缩放的比例, 1 是不变, 2 是表示缩放 1/2 , * @author emmet1988.iteye.com * */ public class MatrixDraw extends View implements Runnable{ Bitmap bitmap; Matrix matrix = new Matrix(); Paint paint; public MatrixDraw(Context context) { super(context); bitmap = ((BitmapDrawable)getResources().getDrawable(R.drawable.rotate_surfaceview)).getBitmap(); paint = new Paint(); paint.setAntiAlias(true); new Thread(this).start(); } float m; float n; @Override protected void onDraw(Canvas canvas) { /* float cosValue = (float)Math.cos(-Math.PI/m); float sinValue = (float)Math.sin(-Math.PI/m); Log.d("matrixdraw", "Math.PI =" + Math.PI); Log.d("matrixdraw", "Math.PI/m =" + Math.PI/m); Log.d("matrixdraw", "Math.cos(-Math.PI/m) =" + (float)Math.cos(-Math.PI/m)); Log.d("matrixdraw", "Math.sin(-Math.PI/m) =" + (float)Math.sin(-Math.PI/m)); matrix.setValues(new float[]{ cosValue,-sinValue,100, sinValue,cosValue,100, 0, 0, 2 });//举例,若缩放值为0.9,代表放大原图的十分之一 // super.onDraw(canvas);//当然,如果界面上还有其他元素需要绘制,只需要将这句话写上就行了。 // Matrix matrix2 = new Matrix(matrix); canvas.drawBitmap(bitmap, matrix, paint); // canvas.drawBitmap(bitmap, matrix2, paint); */ n ++; if (n == 60) { n = 0; } matrix.postRotate(n); matrix.postTranslate(n, n); matrix.postScale(1, 1, n, n); canvas.drawBitmap(bitmap, matrix, paint); } @Override public void run() { while(!Thread.currentThread().isInterrupted()){ try { Thread.sleep(100); postInvalidate(); } catch (InterruptedException e) { Thread.currentThread().interrupt(); } } } /** * 以左上角为顶点,缩放一半,逆时针旋转30度, * 然后沿x轴和y轴分别平移50个像素, * 代码 里面写的是100,为什么是平移50呢, * 因为缩放了一半。 * 大家可以自己设置一下Matrix的值,或者尝试一下两个 * Matrix相乘,得到的值设置进去, * 这样才能对Matrix更加熟练。 */ }