!!!!!!! 下载Demo工程源码点击我<喎?http://www.Bkjia.com/kf/ware/vc/" target="_blank" class="keylink">vc3Ryb25nPjwvcD4NCjxwPqG+uaS9s8j0y64gaHR0cDovL2Jsb2cuY3Nkbi5uZXQveWFuYm9iZXIg16rU2Lezx+vXosP3s/a0pqOs1/DW2LfWz+2zybn7ob88L3A+DQo8aDIgaWQ9"2-实例代码">2 实例代码
如下就是整个工程的源码了。
自定义上面展示的控件AreaChartsView源码：
/**
* Author : yanbo
* Date : 2015-06-03
* Time : 09:22
* Description : 自定义区域描述图表View
*/
public class AreaChartsView extends View {
private Paint mPaint;
private int[] mZeroPos = new int[2];
private int[] mMaxYPos = new int[2];
private int[] mMaxXPos = new int[2];
private int mWidth, mHight;
private int mRealWidth, mRealHight;
private String mTitleY, mTitleX;
private ArrayList mXLevel = new ArrayList<>();
private ArrayList mYLevel = new ArrayList<>();
private ArrayList mGridLevelText = new ArrayList<>();
private ArrayList mGridColorLevel = new ArrayList<>();
private ArrayList mGridTxtColorLevel = new ArrayList<>();
private int mGridLevel = mXLevel.size() - 1;
//title字符大小
private int mXYTitleTextSize = 40;
private int mMeasureXpos, mMeasureYpos;
public AreaChartsView(Context context, AttributeSet attrs) {
super(context, attrs);
mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
mPaint.setAntiAlias(true);
mPaint.setFilterBitmap(true);
}
@Override
protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
super.onLayout(changed, left, top, right, bottom);
mWidth = getWidth();
mHight = getHeight();
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
initPosition();
drawXYTitle(canvas);
drawXYLine(canvas);
drawContent(canvas);
}
private void initPosition() {
//初始化坐标图的xy交点原点坐标
mZeroPos[0] = mXYTitleTextSize * 2;
mZeroPos[1] = mHight - mXYTitleTextSize * 4;
//初始化坐标图的X轴最大值坐标
mMaxXPos[0] = mWidth;
mMaxXPos[1] = mHight - mXYTitleTextSize * 4;
//初始化坐标图的Y轴最大值坐标
mMaxYPos[0] = mXYTitleTextSize * 2;
mMaxYPos[1] = mXYTitleTextSize * 2;
}
private void drawXYTitle(Canvas canvas) {
mPaint.setColor(Color.parseColor(#1FB0E7));
mPaint.setTextSize(mXYTitleTextSize);
mPaint.setTextAlign(Paint.Align.LEFT);
//画Y轴顶的title
canvas.drawText(mTitleY, mMaxYPos[0] - mXYTitleTextSize * 2, mMaxYPos[1] - mXYTitleTextSize, mPaint);
mPaint.setTextAlign(Paint.Align.RIGHT);
//画X轴顶的title
canvas.drawText(mTitleX, mMaxXPos[0], mMaxXPos[1] + mXYTitleTextSize * 2, mPaint);
}
private void drawXYLine(Canvas canvas) {
mPaint.setColor(Color.DKGRAY);
mPaint.setTextAlign(Paint.Align.RIGHT);
//画XY轴
canvas.drawLine(mMaxYPos[0], mMaxYPos[1], mZeroPos[0], mZeroPos[1], mPaint);
canvas.drawLine(mZeroPos[0], mZeroPos[1], mMaxXPos[0], mMaxXPos[1], mPaint);
}
private void drawContent(Canvas canvas) {
mGridLevel = mXLevel.size() - 1;
//计算出偏移title等显示尺标后的真实XY轴长度，便于接下来等分
mRealWidth = (mWidth - mXYTitleTextSize * 2);
mRealHight = (mHight - mXYTitleTextSize * 4);
//算出等分间距
int offsetX = mRealWidth/(mGridLevel);
int offsetY = mRealHight/(mGridLevel+1);
//循环绘制content
for (int index=0; index= mXLevel.get(index) && mMeasureXpos < mXLevel.get(index+1)) {
int subValue = mMeasureXpos - mXLevel.get(index);
int offset = mXLevel.get(index+1) - mXLevel.get(index);
realPosX = mZeroPos[0] + index*offsetX + (subValue / offset);
break;
}
}
//计算传入的y值与真实屏幕坐标的像素值的百分比差值转换
for (int index=0; index= mYLevel.get(index) && mMeasureYpos < mYLevel.get(index+1)) {
int subValue = mMeasureYpos - mYLevel.get(index);
int offset = mYLevel.get(index+1) - mYLevel.get(index);
realPosY = mZeroPos[1] - index*offsetY - (offsetY - (subValue / offset));
break;
}
}
//画我们传入的坐标点的标记小红点
mPaint.setColor(Color.RED);
mPaint.setStyle(Paint.Style.FILL);
canvas.drawCircle(realPosX, realPosY, 8, mPaint);
int[] centerPos = {mZeroPos[0] + mRealWidth/2, mZeroPos[1] - mRealHight/2};
mPaint.setColor(Color.WHITE);
mPaint.setStyle(Paint.Style.FILL_AND_STROKE);
RectF rectF = null;
Path path = new Path();
//画红点旁边的提示框和文字，有四个区域，然后提示框的小三角指标方位不同
if (realPosX <= centerPos[0] && realPosY >= centerPos[1]) {
//left-bottom
//画三角形
path.moveTo(realPosX+5, realPosY+5);
path.lineTo(realPosX+15, realPosY+15);
path.lineTo(realPosX+15, realPosY-15);
//画矩形背景
rectF = new RectF(realPosX+15, realPosY-40, realPosX+200, realPosY + 30);
canvas.drawRoundRect(rectF, 15, 15, mPaint);
//画提示框的文字
mPaint.reset();
mPaint.setColor(Color.RED);
mPaint.setTextSize(mXYTitleTextSize - 5);
canvas.drawText((+mMeasureXpos+, +mMeasureYpos+), realPosX+30, realPosY, mPaint);
}
else if (realPosX <= centerPos[0] && realPosY < centerPos[1]) {
//left-top
path.moveTo(realPosX+5, realPosY+5);
path.lineTo(realPosX+15, realPosY+15);
path.lineTo(realPosX + 15, realPosY - 15);
rectF = new RectF(realPosX+15, realPosY - 20, realPosX+200, realPosY + 50);
canvas.drawRoundRect(rectF, 15, 15, mPaint);
mPaint.reset();
mPaint.setColor(Color.RED);
mPaint.setTextSize(mXYTitleTextSize - 5);
canvas.drawText((+mMeasureXpos+, +mMeasureYpos+), realPosX+30, realPosY+20, mPaint);
}
else if (realPosX > centerPos[0] && realPosY >= centerPos[1]) {
//right-bottom
path.moveTo(realPosX-5, realPosY+5);
path.lineTo(realPosX-15, realPosY+15);
path.lineTo(realPosX - 15, realPosY - 15);
rectF = new RectF(realPosX-200, realPosY-40, realPosX-15, realPosY + 30);
canvas.drawRoundRect(rectF, 15, 15, mPaint);
mPaint.reset();
mPaint.setColor(Color.RED);
mPaint.setTextSize(mXYTitleTextSize - 5);
canvas.drawText((+mMeasureXpos+, +mMeasureYpos+), realPosX-180, realPosY, mPaint);
}
else if (realPosX > centerPos[0] && realPosY < centerPos[1]) {
//right-top
path.moveTo(realPosX-5, realPosY+5);
path.lineTo(realPosX-15, realPosY+15);
path.lineTo(realPosX - 15, realPosY - 15);
rectF = new RectF(realPosX-200, realPosY - 20, realPosX-15, realPosY + 50);
canvas.drawRoundRect(rectF, 15, 15, mPaint);
mPaint.reset();
mPaint.setColor(Color.RED);
mPaint.setTextSize(mXYTitleTextSize - 5);
canvas.drawText((+mMeasureXpos+, +mMeasureYpos+), realPosX-180, realPosY+30, mPaint);
}
path.close();
mPaint.setColor(Color.WHITE);
mPaint.setStyle(Paint.Style.FILL_AND_STROKE);
canvas.drawPath(path, mPaint);
}
//设置当前比值
public void updateValues(int x, int y) {
mMeasureXpos = x;
mMeasureYpos = y;
postInvalidate();
}
//设置XY轴顶角的title字体大小
public void setTitleTextSize(int size) {
mXYTitleTextSize = size;
}
//初始化X轴的坐标区间点值，可以不均等分
public void initXLevelOffset(ArrayList list) {
mXLevel.clear();
mXLevel.addAll(list);
}
//初始化Y轴的坐标区间点值，可以不均等分
public void initYLevelOffset(ArrayList list) {
mYLevel.clear();
mYLevel.addAll(list);
}
//初始化每个区间的提示文字，如果不想显示可以设置
public void initGridLevelText(ArrayList list) {
mGridLevelText.clear();
mGridLevelText.addAll(list);
}
//初始化每个区间的颜色
public void initGridColorLevel(ArrayList list) {
mGridColorLevel.clear();
mGridColorLevel.addAll(list);
}
//初始化每个区间的提示文字颜色
public void initGridTxtColorLevel(ArrayList list) {
mGridTxtColorLevel.clear();
mGridTxtColorLevel.addAll(list);
}
//初始化XY轴title
public void initTitleXY(String x, String y) {
mTitleX = x;
mTitleY = y;
}
}
再来看下布局文件：
再看看主界面：
public class MainActivity extends AppCompatActivity {
private AreaChartsView mAreaChartsView;
private Timer timer;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mAreaChartsView = (AreaChartsView) this.findViewById(R.id.area_charts_view);
//初始化自定义图表的规格和属性
ArrayList mXLevel = new ArrayList<>();
ArrayList mYLevel = new ArrayList<>();
ArrayList mGridLevelText = new ArrayList<>();
ArrayList mGridColorLevel = new ArrayList<>();
ArrayList mGridTxtColorLevel = new ArrayList<>();
//初始化x轴坐标区间
mXLevel.add(0);
mXLevel.add(60);
mXLevel.add(90);
mXLevel.add(100);
mXLevel.add(110);
mXLevel.add(120);
//初始化y轴坐标区间
mYLevel.add(0);
mYLevel.add(90);
mYLevel.add(140);
mYLevel.add(160);
mYLevel.add(180);
mYLevel.add(200);
//初始化区间颜色
mGridColorLevel.add(Color.parseColor(#1FB0E7));
mGridColorLevel.add(Color.parseColor(#4FC7F4));
mGridColorLevel.add(Color.parseColor(#4FDDF2));
mGridColorLevel.add(Color.parseColor(#90E9F4));
mGridColorLevel.add(Color.parseColor(#B2F6F1));
//初始化区间文字提示颜色
mGridTxtColorLevel.add(Color.parseColor(#EA8868));
mGridTxtColorLevel.add(Color.parseColor(#EA8868));
mGridTxtColorLevel.add(Color.parseColor(#EA8868));
mGridTxtColorLevel.add(Color.WHITE);
mGridTxtColorLevel.add(Color.BLACK);
//初始化区间文字
mGridLevelText.add(异常);
mGridLevelText.add(过高);
mGridLevelText.add(偏高);
mGridLevelText.add(正常);
mGridLevelText.add(偏低);
mAreaChartsView.initGridColorLevel(mGridColorLevel);
mAreaChartsView.initGridLevelText(mGridLevelText);
mAreaChartsView.initGridTxtColorLevel(mGridTxtColorLevel);
mAreaChartsView.initXLevelOffset(mXLevel);
mAreaChartsView.initYLevelOffset(mYLevel);
mAreaChartsView.initTitleXY(投入量(H), 产出量(H));
}
@Override
protected void onStart() {
super.onStart();
timer = new Timer();
timer.schedule(new TimerTask() {
@Override
public void run() {
Random random = new Random();
int x = random.nextInt(120) % (120 + 1) + 0;
Random randomy = new Random();
int y = randomy.nextInt(200) % (200 + 1) + 0;
//随机模拟赋值
mAreaChartsView.updateValues(x, y);
}
}, 0, 1000);
}
@Override
protected void onPause() {
super.onPause();
timer.cancel();
}
}
3 总结
上面代码很简单，核心的都已经注释了，不需要过多解释。核心思路就是一些坐标点的计算。该控件支持设置mergin及width与hight等属性，支持自定义所有颜色及显示及坐标区分等，唯一缺陷就是没来得及写attr属性xml设置这些值，有兴趣的自己实现吧，我是没时间了。
可以发现，自定义View无非就是重写前面文章分析的那三个方法而已。
![这里写图片描述](http://www.2cto.com/uploadfile/Collfiles/20150604/20150604082518238.gif "\")
![这里写图片描述](http://www.2cto.com/uploadfile/Collfiles/20150604/20150604082518239.gif "\")
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