Android 加载本地图片 和 服务器图片

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本地图片可以放到 assets 目录下， 也可以在此目录下新建目录，如 assets/foods/apple.png。

代码取本目录下的图片则如下：

String apple = "foods/apple.png";
middle = (ImageView)findViewById(R.id.middle);
middle.setImageBitmap(BitmapUtils.getLoacalBitmapByAssets(reservation.this, apple));


import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;

public class BitmapUtils
{
    /**
    * 加载本地图片
    * @param url
    * @return
    */
    public static Bitmap getLoacalBitmapByAssets(Context c, String url)
    {
        Bitmap bitmap = null;
        InputStream in = null;
        try
        {
            in = c.getResources().getAssets().open(url);
            bitmap = BitmapFactory.decodeStream(in);
        }
        catch (IOException e)
        {
            e.printStackTrace();
        }
        finally
        {
            closeStream(in, null);
        }
        return bitmap;
    }

    /**
    * 从服务器取图片
    * @param url
    * @return
    */
    public static Bitmap getHttpBitmap(String url)
    {
        URL myFileUrl = null;
        Bitmap bitmap = null;
        InputStream in = null;
        try
        {
            myFileUrl = new URL(url);
            HttpURLConnection conn = (HttpURLConnection)myFileUrl.openConnection();
            conn.setConnectTimeout(0);
            conn.setDoInput(true);
            conn.connect();
            in = conn.getInputStream();
            bitmap = BitmapFactory.decodeStream(in);
        }
        catch (IOException e)
        {
            e.printStackTrace();
        }
        finally
        {
            closeStream(in, null);
        }
        return bitmap;
    }

    /** 
     * 关闭输入输出流
     * @param in
     * @param out
     */
    public static void closeStream(InputStream in, OutputStream out)
    {
        try
        {
            if (null != in)
            {
                in.close();
            }
            if (null != out)
            {
                out.close();
            }
        }
        catch (IOException e)
        {
            e.printStackTrace();
        }
    }
}