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>

@Override
public 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;
  }
}