本源码整理于安卓源码：
http://www.apkbus.com/forum.php?mod=viewthread&tid=267170&highlight=%E9%97%B9%E9%92%9F
直接上代码：
绘制折线view
package weather.hanwei.com;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.DashPathEffect;
import android.graphics.Paint;
import android.graphics.Path;
import android.util.AttributeSet;
import android.view.View;
public class WeatherChartView extends View {
/**
* x轴集合
*/
private float mXAxis[] = new float[6];
/**
* 白天y轴集合
*/
private float mYAxisDay[] = new float[6];
/**
* 夜间y轴集合
*/
private float mYAxisNight[] = new float[6];
/**
* x,y轴集合数
*/
private static final int LENGTH = 6;
/**
* 白天温度集合
*/
private int mTempDay[] = new int[6];
/**
* 夜间温度集合
*/
private int mTempNight[] = new int[6];
/**
* 控件高
*/
private int mHeight;
/**
* 字体大小
*/
private float mTextSize;
/**
* 圓半径
*/
private float mRadius;
/**
* 圓半径今天
*/
private float mRadiusToday;
/**
* 文字移动位置距离
*/
private float mTextSpace;
/**
* 线的大小
*/
private float mStokeWidth;
/**
* 白天折线颜色
*/
private int mColorDay;
/**
* 夜间折线颜色
*/
private int mColorNight;
/**
* 字体颜色
*/
private int mTextColor;
/**
* 屏幕密度
*/
private float mDensity;
/**
* 控件边的空白空间
*/
private float mSpace;
@SuppressWarnings("deprecation")
public WeatherChartView(Context context, AttributeSet attrs) {
super(context, attrs);
TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.WeatherChartView);
float densityText = getResources().getDisplayMetrics().scaledDensity;
mTextSize = a.getDimensionPixelSize(R.styleable.WeatherChartView_textSize,
(int) (14 * densityText));
mColorDay = a.getColor(R.styleable.WeatherChartView_dayColor,
getResources().getColor(R.color.colorAccent));
mColorNight = a.getColor(R.styleable.WeatherChartView_nightColor,
getResources().getColor(R.color.colorPrimary));
mTextColor = a.getColor(R.styleable.WeatherChartView_textColor, Color.WHITE);
a.recycle();
mDensity = getResources().getDisplayMetrics().density;
mRadius = 3 * mDensity;
mRadiusToday = 5 * mDensity;
mSpace = 3 * mDensity;
mTextSpace = 10 * mDensity;
mStokeWidth = 2 * mDensity;
}
public WeatherChartView(Context context) {
super(context);
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
if (mHeight == 0) {
// 设置控件高度，x轴集合
setHeightAndXAxis();
}
// 计算y轴集合数值
computeYAxisValues();
// 画白天折线图
drawChart(canvas, mColorDay, mTempDay, mYAxisDay, 0);
// 画夜间折线图
drawChart(canvas, mColorNight, mTempNight, mYAxisNight, 1);
}
/**
* 计算y轴集合数值
*/
private void computeYAxisValues() {
// 存放白天最低温度
int minTempDay = mTempDay[0];
// 存放白天最高温度
int maxTempDay = mTempDay[0];
for (int item : mTempDay) {
if (item < minTempDay) {
minTempDay = item;
}
if (item > maxTempDay) {
maxTempDay = item;
}
}
// 存放夜间最低温度
int minTempNight = mTempNight[0];
// 存放夜间最高温度
int maxTempNight = mTempNight[0];
for (int item : mTempNight) {
if (item < minTempNight) {
minTempNight = item;
}
if (item > maxTempNight) {
maxTempNight = item;
}
}
// 白天，夜间中的最低温度
int minTemp = minTempNight < minTempDay ? minTempNight : minTempDay;
// 白天，夜间中的最高温度
int maxTemp = maxTempDay > maxTempNight ? maxTempDay : maxTempNight;
// 份数（白天，夜间综合温差）
float parts = maxTemp - minTemp;
// y轴一端到控件一端的距离
float length = mSpace + mTextSize + mTextSpace + mRadius;
// y轴高度
float yAxisHeight = mHeight - length * 2;
// 当温度都相同时（被除数不能为0）
if (parts == 0) {
for (int i = 0; i < LENGTH; i++) {
mYAxisDay[i] = yAxisHeight / 2 + length;
mYAxisNight[i] = yAxisHeight / 2 + length;
}
} else {
float partValue = yAxisHeight / parts;
for (int i = 0; i < LENGTH; i++) {
mYAxisDay[i] = mHeight - partValue * (mTempDay[i] - minTemp) - length;
mYAxisNight[i] = mHeight - partValue * (mTempNight[i] - minTemp) - length;
}
}
}
/**
* 画折线图
*
* @param canvas 画布
* @param color 画图颜色
* @param temp 温度集合
* @param yAxis y轴集合
* @param type 折线种类：0，白天；1，夜间
*/
private void drawChart(Canvas canvas, int color, int temp[], float[] yAxis, int type) {
// 线画笔
Paint linePaint = new Paint();
// 抗锯齿
linePaint.setAntiAlias(true);
// 线宽
linePaint.setStrokeWidth(mStokeWidth);
linePaint.setColor(color);
// 空心
linePaint.setStyle(Paint.Style.STROKE);
// 点画笔
Paint pointPaint = new Paint();
pointPaint.setAntiAlias(true);
pointPaint.setColor(color);
// 字体画笔
Paint textPaint = new Paint();
textPaint.setAntiAlias(true);
textPaint.setColor(mTextColor);
textPaint.setTextSize(mTextSize);
// 文字居中
textPaint.setTextAlign(Paint.Align.CENTER);
int alpha1 = 102;
int alpha2 = 255;
for (int i = 0; i < LENGTH; i++) {
// 画线
if (i < LENGTH - 1) {
// 昨天
if (i == 0) {
linePaint.setAlpha(alpha1);
// 设置虚线效果
linePaint.setPathEffect(new DashPathEffect(new float[]{2 * mDensity, 2 * mDensity}, 0));
// 路径
Path path = new Path();
// 路径起点
path.moveTo(mXAxis[i], yAxis[i]);
// 路径连接到
path.lineTo(mXAxis[i + 1], yAxis[i + 1]);
canvas.drawPath(path, linePaint);
} else {
linePaint.setAlpha(alpha2);
linePaint.setPathEffect(null);
canvas.drawLine(mXAxis[i], yAxis[i], mXAxis[i + 1], yAxis[i + 1], linePaint);
}
}
// 画点
if (i != 1) {
// 昨天
if (i == 0) {
pointPaint.setAlpha(alpha1);
canvas.drawCircle(mXAxis[i], yAxis[i], mRadius, pointPaint);
} else {
pointPaint.setAlpha(alpha2);
canvas.drawCircle(mXAxis[i], yAxis[i], mRadius, pointPaint);
}
// 今天
} else {
pointPaint.setAlpha(alpha2);
canvas.drawCircle(mXAxis[i], yAxis[i], mRadiusToday, pointPaint);
}
// 画字
// 昨天
if (i == 0) {
textPaint.setAlpha(alpha1);
drawText(canvas, textPaint, i, temp, yAxis, type);
} else {
textPaint.setAlpha(alpha2);
drawText(canvas, textPaint, i, temp, yAxis, type);
}
}
}
/**
* 绘制文字
*
* @param canvas 画布
* @param textPaint 画笔
* @param i 索引
* @param temp 温度集合
* @param yAxis y轴集合
* @param type 折线种类：0，白天；1，夜间
*/
private void drawText(Canvas canvas, Paint textPaint, int i, int[] temp, float[] yAxis, int type) {
switch (type) {
case 0:
// 显示白天气温
canvas.drawText(temp[i] + "°C", mXAxis[i], yAxis[i] - mRadius - mTextSpace, textPaint);
break;
case 1:
// 显示夜间气温
canvas.drawText(temp[i] + "°C", mXAxis[i], yAxis[i] + mTextSpace + mTextSize, textPaint);
break;
}
}
/**
* 设置高度，x轴集合
*/
private void setHeightAndXAxis() {
mHeight = getHeight();
// 控件宽
int width = getWidth();
// 每一份宽
float w = width / 12;
mXAxis[0] = w;
mXAxis[1] = w * 3;
mXAxis[2] = w * 5;
mXAxis[3] = w * 7;
mXAxis[4] = w * 9;
mXAxis[5] = w * 11;
}
/**
* 设置白天温度
*
* @param tempDay 温度数组集合
*/
public void setTempDay(int[] tempDay) {
mTempDay = tempDay;
}
/**
* 设置夜间温度
*
* @param tempNight 温度数组集合
*/
public void setTempNight(int[] tempNight) {
mTempNight = tempNight;
}
}样式：
<?xml version="1.0" encoding="utf-8"?> <resources> <declare-styleable name="WeatherChartView"> <attr name="textColor" format="color"/> <attr name="dayColor" format="color"/> <attr name="nightColor" format="color"/> <attr name="textSize" format="dimension"/> </declare-styleable> </resources>
xml布局：
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:wcv="http://schemas.android.com/apk/res-auto" android:layout_width="match_parent" android:layout_height="match_parent" android:background="@android:color/black"> <weather.hanwei.com.WeatherChartView android:id="@+id/line_char" android:layout_width="match_parent" android:layout_height="150dp" android:layout_centerInParent="true" wcv:dayColor="@color/colorAccent" wcv:nightColor="@color/colorPrimary" wcv:textColor="@android:color/white" wcv:textSize="14sp"/> </RelativeLayout>
在Main中调用：
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
WeatherChartView chartView = (WeatherChartView) findViewById(R.id.line_char);
// 设置白天温度曲线
chartView .setTempDay(new int[]{5,6,4,6,7,6,10});
// 设置夜间温度曲线
chartView .setTempNight(new int[]{0,-1,-2,0,2,0,4});
chartView .invalidate();
}
}样式图：
以上就是整理的所有代码，可直接运行！
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