Android编程实现网络图片查看器和网页源码查看器实例

<!-- 访问internet权限 --><uses-permission android:name="android.permission.INTERNET"/>

public class MainActivity extends Activity {  private EditText imagepath;  private ImageView imageView;  @Override  public void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.main);    imagepath = (EditText) this.findViewById(R.id.imagepath);    imageView = (ImageView) this.findViewById(R.id.imageView);    Button button = (Button) this.findViewById(R.id.button);    button.setOnClickListener(new View.OnClickListener() {      public void onClick(View v) {        String path = imagepath.getText().toString();        try{          byte[] data = ImageService.getImage(path);//获取图片数据          if(data!=null){            //构建位图对象            Bitmap bitmap = BitmapFactory.decodeByteArray(data, 0, data.length);            imageView.setImageBitmap(bitmap);//显示图片          }else{            Toast.makeText(getApplicationContext(), R.string.error, 1).show();          }        }catch (Exception e) {          Toast.makeText(getApplicationContext(), R.string.error, 1).show();        }      }    });  }}

public class ImageService {  /**   * 获取图片   * @param path 网络图片路径   * @return 图片的字节数据   */  public static byte[] getImage(String path) throws Exception{    URL url = new URL(path);    HttpURLConnection conn = (HttpURLConnection) url.openConnection();    //设置超时时间    conn.setConnectTimeout(5000);    conn.setRequestMethod("GET");    if(conn.getResponseCode()==200){      InputStream inStream = conn.getInputStream();      byte[] data = StreamTool.read(inStream);      return data;    }    return null;  }}

public class StreamTool {  /**   * 读取输入流数据   * @param inStream   * @return   */  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();  }}

<ScrollView android:layout_width="wrap_content" android:layout_height="wrap_content"><TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:id="@+id/htmlsource" /></ScrollView>

@Overridepublic void onCreate(Bundle savedInstanceState) {   super.onCreate(savedInstanceState);   setContentView(R.layout.main);   pathText = (EditText) this.findViewById(R.id.path);   htmlsource = (TextView) this.findViewById(R.id.htmlsource);   Button button = (Button) this.findViewById(R.id.button);   button.setOnClickListener(new View.OnClickListener() {  public void onClick(View v) {    String path = pathText.getText().toString();    try{      //获取源码      String html = PageService.getHtml(path);      htmlsource.setText(html);    }catch (Exception e) {      Toast.makeText(getApplicationContext(), R.string.error, 1).show();    }  }});}

public class PageService {  /**   * 获取网页源代码   * @param path 网页路径   * @return   */  public static String getHtml(String path) throws Exception{    URL url = new URL(path);    HttpURLConnection conn = (HttpURLConnection) url.openConnection();    conn.setConnectTimeout(5000);    conn.setRequestMethod("GET");    if(conn.getResponseCode() == 200){      byte[] data = StreamTool.read(conn.getInputStream());      return new String(data, "UTF-8");    }    return null;  }}