代码:
package com.example.brush; import android.content.Context; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import android.util.AttributeSet; import android.view.View; public class Line extends View{ public Line(Context context) { super(context); // TODO Auto-generated constructor stub } public Line(Context context, AttributeSet attrs) { super(context, attrs); // TODO Auto-generated constructor stub } public Line(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); // TODO Auto-generated constructor stub } @Override protected void onDraw(Canvas canvas) { // TODO Auto-generated method stub super.onDraw(canvas); Paint paint=new Paint(); paint.setColor(Color.RED); paint.setTextSize(20); paint.setStrokeWidth(20);//设置现款 canvas.drawLine(20, 20, 200, 200, paint);//直线 1.开始X 2.开始Y 3.结束X 4.结束Y 5.画笔 canvas.drawText("我是被画出来的", 10, 100, paint);//文字 1.显示文字 2.开始X 3.开始Y 4.画笔 canvas.drawCircle(55, 55, 50, paint);//圆 1.圆心X 2.圆心Y 3.半径 4.画笔 } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { // TODO Auto-generated method stub // super.onMeasure(widthMeasureSpec, heightMeasureSpec); setMeasuredDimension(200, 200);//画板宽高 } }
xml页面:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context=".MainActivity" > <com.example.brush.Line android:layout_width="wrap_content" android:layout_height="wrap_content" /> </RelativeLayout>
MainActivity:
package com.example.day1_one; import android.os.Bundle; import android.app.Activity; import android.view.Menu; public class MainActivity extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); } }
效果图: