android網路編程：URL擷取資料和圖片

首先，開始最簡單的網路編程實戰，URL實現網路連接，不懂的童鞋可以參考JAVA中的URL編程，其原理是 一樣的，在這裡不再多做解釋。

直接貼出實現原始碼：

public class DataActivity extends Activity {        private EditText imagePathText;        private static final String TAG="DataActivity";        private ImageView imageView;               @Override    public void onCreate(Bundle savedInstanceState) {            super.onCreate(savedInstanceState);            setContentView(R.layout.main);            imagePathText = (EditText) findViewById(R.id.imagepath);            imageView=(ImageView)findViewById(R.id.imageView);                                            Button button = (Button) findViewById(R.id.button);            button.setOnClickListener(new View.OnClickListener() {                       @Override            public void onClick(View v) {                    String path = imagePathText.getText().toString();                    try {                                                    byte[] data=NetTool.getImage(path);                        Bitmap bm=BitmapFactory.decodeByteArray(data, 0, data.length);                        imageView.setImageBitmap(bm);                    } catch (Exception e) {                        Log.i(TAG, e.toString());                        Toast.makeText(DataActivity.this, "獲得圖片失敗", 1).show();                    }                }            });                    //      擷取網頁原始碼            Button sinaButton = (Button) findViewById(R.id.sinaButton);            sinaButton.setOnClickListener(new View.OnClickListener() {                       @Override            public void onClick(View v) {                    Intent intent=new Intent(DataActivity.this,SinaActivity.class);                    startActivity(intent);                }            });               }    }

public class SinaActivity extends Activity {        private TextView textView;        private static final String TAG="SinaActivity";    //  擷取網頁原始碼        public void onCreate(Bundle savedInstanceState) {            super.onCreate(savedInstanceState);            setContentView(R.layout.sina);                            textView=(TextView)this.findViewById(R.id.sina);            try {                String html=NetTool.getHtml("http://www.sina.com.cn","GBK");                textView.setText(html);            } catch (Exception e) {                Log.i(TAG, e.toString());                Toast.makeText(SinaActivity.this, "獲得網頁失敗", 1).show();            }        }    }

public class NetTool {        /**        * 獲得url代碼資料        * */                public static String getHtml(String path,String encoding) throws Exception {            URL url = new URL(path);            HttpURLConnection conn = (HttpURLConnection) url.openConnection();            conn.setRequestMethod("GET");            conn.setConnectTimeout(6 * 1000);            // 別超過6秒。            System.out.println(conn.getResponseCode());            if(conn.getResponseCode()==200){                InputStream inputStream=conn.getInputStream();                byte[] data=readStream(inputStream);                return new String(data,encoding);            }            return null;        }                /**    * 擷取指定路徑，的資料。    *     * **/    public static byte[] getImage(String urlpath) throws Exception {            URL url = new URL(urlpath);            HttpURLConnection conn = (HttpURLConnection) url.openConnection();            conn.setRequestMethod("GET");            conn.setConnectTimeout(6 * 1000);            // 別超過6秒。            if(conn.getResponseCode()==200){                InputStream inputStream=conn.getInputStream();                return readStream(inputStream);            }            return null;        }                    /**        * 讀取資料         * 輸入資料流        *         * */    public static byte[] readStream(InputStream inStream) throws Exception {            ByteArrayOutputStream outstream=new ByteArrayOutputStream();            byte[] buffer=new byte[1024];            int len=-1;            while((len=inStream.read(buffer)) !=-1){                outstream.write(buffer, 0, len);            }            outstream.close();            inStream.close();                        return outstream.toByteArray();    }    }