Android 通過網絡獲取圖片的代碼

Android 通過網絡獲取圖片的代碼

package com.netimg;

import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.Toast;
public class AndroidnetimgActivity extends Activity {
    /* Called when the activity is first created. /
    //定義所使用的組件
    private Button button;
    private EditText editText;
    private ImageView imagesView;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    //實例化用到的組件
    editText =(EditText)findViewById(R.id.EditText);
    imagesView = (ImageView)findViewById(R.id.ImageView);
    button = (Button)findViewById(R.id.Button);

    //為按鈕添加監聽事件
    button.setOnClickListener(new buttonListener());

}


private final class buttonListener implements OnClickListener{

    @Override
    public void onClick(View v) {
        String path = editText.getText().toString();

        System.out.println(path);

        //通過業務類ImageService的getImage方法得到數據
        try {
            byte[] data = ImageService.getImage(path);
            Bitmap bitmap = BitmapFactory.decodeByteArray(data, 0, data.length);
            imagesView.setImageBitmap(bitmap);//顯示圖片
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
            Toast.makeText(getApplicationContext(), "獲取失敗", 1).show();
        }


    }

}

}
 </pre> 業務類
package com.netimg;

import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
public class ImageService {

public static byte[] getImage(String path) throws Exception {

    URL url = new URL(path);
    //基于HTTP協議連接對象
    HttpURLConnection conn = (HttpURLConnection)url.openConnection();

    conn.setConnectTimeout(5000);
    conn.setRequestMethod("GET");

    if(conn.getResponseCode() == 200){
        InputStream inStream = conn.getInputStream();
        return StreamTool.read(inStream);
    }

    return null;
}


}
 </pre> 工具類
package com.netimg;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
public class StreamTool {

public static byte[] read(InputStream inStream) throws IOException {
    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();
}


} </pre> 獲取網絡權限
<uses-permission android:name="android.permission.INTERNET"/>