android17

【网络图片查看】

package cn.itcast.image;

import cn.itcast.service.ImageService;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.Toast;

public class MainActivity extends Activity {
    private EditText pathText;
    private ImageView imageView;
    
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        pathText = (EditText) this.findViewById(R.id.imagepath);
        imageView = (ImageView) this.findViewById(R.id.imageView);
        Button button = (Button) this.findViewById(R.id.button);
        button.setOnClickListener(new ButtonClickListener());
    }
    
    private final class ButtonClickListener implements View.OnClickListener{

        public void onClick(View v) {
            String path = pathText.getText().toString();
            try{
                byte[] data = ImageService.getImage(path);
                Bitmap bitmap = BitmapFactory.decodeByteArray(data, 0, data.length);
                imageView.setImageBitmap(bitmap);//显示图片
            }catch (Exception e) {
                e.printStackTrace();
                Toast.makeText(getApplicationContext(), R.string.error, 1).show();
            }
        }
    }
}

package cn.itcast.service;

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

import cn.itcast.utils.StreamTool;

public class ImageService {
    /**
     * 获取网络图片的数据
     * @param path 网络图片路径
     * @return
     */
    public static byte[] getImage(String path) throws Exception{
        URL url = new URL(path);
        HttpURLConnection conn = (HttpURLConnection) url.openConnection();//基于HTTP协议连接对象
        conn.setConnectTimeout(5000);
        conn.setRequestMethod("GET");
        if(conn.getResponseCode() == 200){
            InputStream inStream = conn.getInputStream();
            return StreamTool.read(inStream);
        }
        return null;
    }

}

package cn.itcast.utils;

import java.io.ByteArrayOutputStream;
import java.io.InputStream;

public class StreamTool {
    /**
     * 读取流中的数据
     * @param inStream
     * @return
     * @throws Exception
     */
    public static byte[] read(InputStream inStream) throws Exception{
        ByteArrayOutputStream outStream = new ByteArrayOutputStream();
        byte[] buffer = new byte[1024];
        int len = 0;
        while( (len = inStream.read(buffer)) != -1){
            outStream.write(buffer, 0, len);
        }
        inStream.close();
        return outStream.toByteArray();
    }

}