android图像相关_IT900学习网

首先是Bitmap：

从资源文件中得到bitmap有两种方式：

一：

		Resources r = getResources();
		InputStream is = r.openRawResource(R.drawable.icon);
		BitmapDrawable bmpDraw = new BitmapDrawable(is);
		Bitmap bmp1 = bmpDraw.getBitmap();

二：

BitmapDrawable drawable = (BitmapDrawable)r.getDrawable(R.drawable.icon)

一下是画各种图形，首先写了一个画图形的接口：

package com.song.ui;

import android.graphics.Canvas;

public interface drawGraphics
{
	public void draw(Canvas canvas);
}

然后花各种图形的时候实现接口：

画线：

package com.song.ui;

import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;

/**
 * 画线
 * @author song
 *
 */
public class DrawLine implements drawGraphics
{
	//声明一个画笔
	private Paint mPaint;
	
	public DrawLine()
	{
		mPaint = new Paint();
	}
	
	@Override
	public void draw(Canvas canvas)
	{
		//消除锯齿
		mPaint.setAntiAlias(true);
		//直线 颜色：绿色
		mPaint.setColor(Color.GREEN);
		//设置线条粗细
		mPaint.setStrokeWidth(12);
		//画两条直线
		canvas.drawLine(90, 40, 140, 90, mPaint);
		canvas.drawLine(290, 90, 340, 40, mPaint);
	}
}

画圆：

package com.song.ui;

import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.RectF;

/**
 * 画圆
 * @author song
 *
 */
public class DrawCircle implements drawGraphics
{
	private Paint paint ;
	private Paint paint_eye;
	
	public DrawCircle()
	{
		paint= new Paint();
		paint_eye=new Paint();
	}
	
	@Override
	public void draw(Canvas canvas)
	{
		//绘制圆形（圆心X，圆心Y，半径R，画笔P）
		paint_eye.setAntiAlias(true);
		paint.setAntiAlias(true);
		RectF rectF= new RectF(90, 60, 340, 240);
		paint_eye.setColor(Color.WHITE);
		paint.setColor(Color.GREEN);
		canvas.drawArc(rectF, 180, 180, true, paint);
		//画两个眼睛
		canvas.drawCircle(160, 110, 18, paint_eye);
		canvas.drawCircle(270, 110, 18, paint_eye);
	}

}

画矩形：

package com.song.ui;

import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.RectF;

/**
 * 画矩形
 * 
 * @author song
 * 
 */
public class DrawRect implements drawGraphics
{
	private Paint paint;

	public DrawRect()
	{
		paint = new Paint();
	}

	@Override
	public void draw(Canvas canvas)
	{
		// 定义圆角矩形对象
		RectF rectF1 = new RectF(90, 170, 340, 500);
		RectF rectF2 = new RectF(10, 150, 60, 400);
		RectF rectF3 = new RectF(360, 150, 410, 400);
		RectF rectF4 = new RectF(110, 520, 170, 650);
		RectF rectF5 = new RectF(260, 520, 320, 650);
		paint.setAntiAlias(true);
		// 设置画笔颜色为BLUE
		paint.setColor(Color.GREEN);
		// 在画布上绘制圆角矩形/圆弧/直线
		canvas.drawRoundRect(rectF1, 20, 20, paint);
		canvas.drawRoundRect(rectF2, 20, 20, paint);
		canvas.drawRoundRect(rectF3, 20, 20, paint);
		canvas.drawRoundRect(rectF4, 20, 20, paint);
		canvas.drawRoundRect(rectF5, 20, 20, paint);
	}

}

这个可以画出来一个Android的机器人，

工程名：TL03_graphics_test

(责任编辑：qhgongzi)