android折线图带滚动,折线图，左右滚动，纯代码实现

package com.example.linechardemo;

import android.app.Activity;

import android.content.Context;

import android.graphics.Canvas;

import android.graphics.Color;

import android.graphics.Paint;

import android.os.Bundle;

import android.view.View;

import android.widget.HorizontalScrollView;

import android.widget.LinearLayout;

import java.util.Random;

public class MainActivity extends Activity {

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

LinearLayout linearLayout = (LinearLayout) findViewById(R.id.activity);

linearLayout.addView(new MyView3(this),0);

HorizontalScrollView horizontalScrollView = new HorizontalScrollView(this);

horizontalScrollView.addView(new MyView(this));

horizontalScrollView.setOverScrollMode(View.OVER_SCROLL_NEVER);

horizontalScrollView.setHorizontalScrollBarEnabled(false);

linearLayout.addView(horizontalScrollView);

}

//y轴

class MyView3 extends View {

public MyView3(Context context) {

super(context);

}

@Override

protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {

setMeasuredDimension(MeasureSpec.getSize(7), MeasureSpec.getSize(heightMeasureSpec)/2);

}

@Override

protected void onDraw(Canvas canvas) {

super.onDraw(canvas);

Paint paint = new Paint();

paint.setColor(Color.RED);

paint.setStyle(Paint.Style.STROKE);

paint.setAntiAlias(true);

paint.setStrokeWidth(10);

canvas.drawLine(0, 0, 0, getHeight()+10, paint);

}

}

//x轴

class MyView extends View {

//横坐标的区间

private int qujian;

public MyView(Context context) {

super(context);

}

@Override

protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {

qujian = (MeasureSpec.getSize(widthMeasureSpec) - jianju * 2) / currentSize;

setMeasuredDimension(qujian * size + jianju * 2, MeasureSpec.getSize(heightMeasureSpec));

}

int currentSize = 6;

int size = 11;

int jianju = 50;

@Override

protected void onDraw(Canvas canvas) {

super.onDraw(canvas);

canvas.drawColor(Color.BLACK);

Paint paint = new Paint();

paint.setColor(Color.RED);

paint.setStyle(Paint.Style.STROKE);

paint.setAntiAlias(true);

paint.setStrokeWidth(5);

canvas.drawLine(0, getHeight() / 2, qujian * size + jianju, getHeight() / 2, paint);

int max = getHeight() / 2;

int min = 100;

int[] points = new int[11];

for (int i = 0; i < 11; i++) {

int currentX = jianju + qujian * (1 + i);

canvas.drawLine(currentX, getHeight() / 2, currentX, getHeight() / 2 - 10, paint);

Random random = new Random();

int r = random.nextInt(max) % (max - min + 1) + min;

canvas.drawCircle(currentX, r, 5, paint);

points[i] = r;

}

for (int i = 0; i < points.length; i++) {

int currentX = jianju + qujian * (1 + i);

int nextX = jianju + qujian * (2 + i);

if (i != 10)

canvas.drawLine(currentX, points[i], nextX, points[i + 1], paint);

}

}

}

}