效果图:
代码:
package com.example.lenovo.mydemo.myViewDemo;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Typeface;
import android.support.annotation.Nullable;
import android.util.AttributeSet;
import android.util.Log;
import android.view.View;
import com.example.lenovo.mydemo.R;
/**
* Created by lenovo on 2018/7/2.
*/
public class MyView_1 extends View {
private final String TAG = "MyView_1";
private Paint mPaint;
private int i = 0;
public MyView_1(Context context) {
super(context);
}
public MyView_1(Context context, @Nullable AttributeSet attrs) {
super(context, attrs);
}
public MyView_1(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
mPaint = new Paint();
mPaint .setStrokeWidth(20);
mPaint.setColor(Color.RED);
canvas.drawLine(0,100,i,100,mPaint);
if (i==500){
i=0;
}else {
i=i+10;
}
postInvalidateDelayed(100);//延时100毫秒刷新
}
}