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);
}
}
}
}
折线图,左右滚动,纯代码实现
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