android:ImageView,訪問網上圖片並顯示出來

package com.example.utils;

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

public class StreamTool {
	public static byte[] readInputStream(InputStream inStream) throws Exception {
		ByteArrayOutputStream outStream = new ByteArrayOutputStream();// 輸出流，寫到內存
		byte[] buffer = new byte[1024];// 1K緩沖區容量
		int len = 0;
		while ((len = inStream.read(buffer)) != -1) {
			outStream.write(buffer, 0, len);// 從數組buffer中讀取從0到len的數據
		}
		inStream.close();
		return outStream.toByteArray();
	}
}

package com.example.image;

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

import com.example.utils.StreamTool;

public class ImageService {
	public static byte[] getImage(String path) throws Throwable {
		URL url = new URL(path);
		HttpURLConnection conn = (HttpURLConnection) url.openConnection();
		conn.setRequestMethod("GET");
		conn.setConnectTimeout(5 * 1000);
		InputStream inStream = conn.getInputStream();// 通過輸入流獲取圖片數據
		return StreamTool.readInputStream(inStream);// 得到的圖片的二進制數據
	}
}

package com.example.image;

import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.Toast;

public class ImageActivity extends Activity {

	private static final String TAG = "ImageActivity";
	private EditText pathText;
	private ImageView imageView;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_image);
		pathText = (EditText) this.findViewById(R.id.urlpath);
		imageView = (ImageView) this.findViewById(R.id.show);
		Button button = (Button) this.findViewById(R.id.button);
		button.setOnClickListener(new View.OnClickListener() {

			@Override
			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);// 顯示圖片
				} catch (Throwable e) {
					Toast.makeText(ImageActivity.this, R.string.error, Toast.LENGTH_LONG)
							.show();
					Log.e(TAG, e.toString());
				}
			}
		});
	}
}
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