BaseTools.java

package com.jshop.android.util;

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;

import org.apache.http.util.EncodingUtils;

import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Matrix;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;

public class BaseTools extends Activity {

	/**
	 * 写入一个默认的餐桌值，用来检测未就做即可点菜的问题
	 * @param content
	 */
	public void writeJmtable(String content){
		try{
			//实例化文件文件输出流
			FileOutputStream fos=openFileOutput(JshopMParams.SHAREMTABLEPARAM,MODE_WORLD_WRITEABLE+MODE_WORLD_WRITEABLE);
			fos.write(content.getBytes());
			fos.close();
		}catch(Exception e){
			e.printStackTrace();
		}
	}
	/**
	 * 读取餐桌信息文件
	 * @return
	 */
	public String readJmtable(){
		String res="";
		try{
			FileInputStream fis=openFileInput(JshopMParams.SHAREMTABLEPARAM);
			byte[]buffer=new byte[fis.available()];
			fis.read(buffer);
			res=EncodingUtils.getString(buffer,"UTF-8");
			fis.close();
		}catch(Exception e){
			e.printStackTrace();
		}
		return res;
	}
	
	/**
	 * 读取服务器地址
	 */
	public void gethosturl(){
		String oserverhost=read();
		if(oserverhost!=null){
			//放入静态变量
			JshopActivityUtil.BASE_URL="http://"+oserverhost;
		}
	}
	
	/**
	 * 读取服务器地址文件
	 * @return
	 */
	public String read(){
		String res="";
		try{
			FileInputStream fis=openFileInput(JshopMParams.FILENAME);
			byte[]buffer=new byte[fis.available()];
			fis.read(buffer);
			res=EncodingUtils.getString(buffer,"UTF-8");
			fis.close();
		}catch(Exception e){
			e.printStackTrace();
		}
		return res;
	}
	
	/**
	 * 写文件，保存服务器地址
	 * @param content
	 */
	public void write(String content){
		try{
			//实例化文件文件输出流
			FileOutputStream fos=openFileOutput(JshopMParams.FILENAME,MODE_WORLD_WRITEABLE+MODE_WORLD_WRITEABLE);
			fos.write(content.getBytes());
			fos.close();
		}catch(Exception e){
			e.printStackTrace();
		}
	}
	
	/**
	 * 获取网络图片
	 * @param pictureurl
	 * @return
	 * @throws IOException
	 */
	public  Bitmap getPictureurlImg(String pictureurl) throws IOException{
		URL url=new URL(pictureurl);
		HttpURLConnection conn=(HttpURLConnection)url.openConnection();
		conn.setRequestMethod("GET");
		conn.setConnectTimeout(5*1000);
		InputStream in=conn.getInputStream();
		Bitmap bm=BitmapFactory.decodeStream(in);
		in.close();
		return bm;
	}
	
	
	public static Drawable resizeImage(Bitmap bitmap,int w,int h){
		// load the origial Bitmap
        Bitmap BitmapOrg = bitmap;

        int width = BitmapOrg.getWidth();
        int height = BitmapOrg.getHeight();
        int newWidth = w;
        int newHeight = h;
       

        // calculate the scale
        float scaleWidth = ((float) newWidth) / width;
        float scaleHeight = ((float) newHeight) / height;

        // create a matrix for the manipulation
        Matrix matrix = new Matrix();
        // resize the Bitmap
        matrix.postScale(scaleWidth, scaleHeight);
        // if you want to rotate the Bitmap
        // matrix.postRotate(45);

        // recreate the new Bitmap
        Bitmap resizedBitmap = Bitmap.createBitmap(BitmapOrg, 0, 0, width,
                        height, matrix, true);

        // make a Drawable from Bitmap to allow to set the Bitmap
        // to the ImageView, ImageButton or what ever
        return new BitmapDrawable(resizedBitmap);
	}
	
}