绘制扇形

 

 

在main.xml中：

 

<LinearLayout

    xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="fill_parent"

    android:layout_height="fill_parent">

  <com.li.paintproject.MyView

      android:layout_width="fill_parent"

      android:layout_height="wrap_content"/>

</LinearLayout>

 

 

 

 

 

在MyPaintDemo.java中：

 

package com.li.paintproject;

 

import android.os.Bundle;

import android.app.Activity;

import android.view.Menu;

import android.view.MenuItem;

import android.support.v4.app.NavUtils;

 

public class MyPaintDemo extends Activity {

 

    @Override

    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.main);

    }

}

 

 

 

 

在MyView.java中：

 

package com.li.paintproject;

 

import android.content.Context;

import android.graphics.Canvas;

import android.graphics.Color;

import android.graphics.Paint;

import android.graphics.Paint.Style;

import android.graphics.RectF;

import android.util.AttributeSet;

import android.view.View;

 

public class MyView extends View {

 

  public MyView(Context context, AttributeSet attrs) {

     super(context, attrs);

  }

 

  @Override

  protected void onDraw(Canvas canvas) {

     canvas.drawColor(Color.BLACK) ;  // 画布为黑色

     Paint paint = new Paint() ;

     RectF oval = new RectF();   //浮点型的

     paint.setColor(Color.YELLOW);

     paint.setStyle(Style.STROKE); //空心的

    

     oval = new RectF();

    

     //扇形左上角坐标（80.0f,120.0f），右上角坐标（400.0f,200.0f）

     oval.set(80.0f,80.0f,500.0f,500.0f);

     canvas.drawArc(oval, 150.0f, 140.0f, true, paint);

  }

}