Html类ImageGetter接口

public class ImgLabelActivity extends Activity {
private static final String TAG = "ImgLabelActivity";
/**本地图片*/
private TextView mTvOne;
/**项目资源图片*/
private TextView mTvTwo;
/**网络图片*/
private TextView mTvThree;
/**网络图片name*/
private String picName = "networkPic.jpg";
/**网络图片Getter*/
private NetworkImageGetter mImageGetter;
/**网络图片路径*/
private String htmlThree = "网络图片测试：" + "<img src='//img-my.csdn.net/uploads/201307/14/1373780364_7576.jpg'>";

@Override
public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_img_label);

  mTvOne = (TextView) this.findViewById(R.id.tv_img_label_one);
  String htmlOne = "本地图片测试：" + "<img src='/mnt/sdcard/imgLabel.jpg'>";
  mTvOne.setText(Html.fromHtml(htmlOne, new LocalImageGetter(), null));

  mTvTwo = (TextView) this.findViewById(R.id.tv_img_label_two);
  String htmlTwo = "项目图片测试：" + "<img src=""+R.drawable.imagepro+"">";
  mTvTwo.setText(Html.fromHtml(htmlTwo, new ProImageGetter(), null));


  mTvThree = (TextView) this.findViewById(R.id.tv_img_label_three);
  mImageGetter = new NetworkImageGetter();
  mTvThree.setText(Html.fromHtml(htmlThree, mImageGetter, null));
}
/**
 * 本地图片
 * @author Susie
 */
private final class LocalImageGetter implements Html.ImageGetter{

  @Override
  public Drawable getDrawable(String source) {
    // 获取本地图片
    Drawable drawable = Drawable.createFromPath(source);
    // 必须设为图片的边际,不然TextView显示不出图片
    drawable.setBounds(0, 0, drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight());
    // 将其返回
    return drawable;
  }
}
/**
 * 项目资源图片
 * @author Susie
 */
private final class ProImageGetter implements Html.ImageGetter{

  @Override
  public Drawable getDrawable(String source) {
    // 获取到资源id
    int id = Integer.parseInt(source);
    Drawable drawable = getResources().getDrawable(id);
    drawable.setBounds(0, 0, drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight());
    return drawable;
  }
}
/**
 * 网络图片
 * @author Susie
 */
private final class NetworkImageGetter implements Html.ImageGetter{

  @Override
  public Drawable getDrawable(String source) {

    Drawable drawable = null;
    // 封装路径
    File file = new File(Environment.getExternalStorageDirectory(), picName);
    // 判断是否以http开头
    if(source.startsWith("http")) {
      // 判断路径是否存在
      if(file.exists()) {
        // 存在即获取drawable
        drawable = Drawable.createFromPath(file.getAbsolutePath());
        drawable.setBounds(0, 0, drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight());
      } else {
        // 不存在即开启异步任务加载网络图片
        AsyncLoadNetworkPic networkPic = new AsyncLoadNetworkPic();
        networkPic.execute(source);
      }
    }
    return drawable;
  }
}
/**
 * 加载网络图片异步类
 * @author Susie
 */
private final class AsyncLoadNetworkPic extends AsyncTask<String, Integer, Void>{

  @Override
  protected Void doInBackground(String... params) {
    // 加载网络图片
    loadNetPic(params);
    return null;
  }

  @Override
  protected void onPostExecute(Void result) {
    super.onPostExecute(result);
    // 当执行完成后再次为其设置一次
    mTvThree.setText(Html.fromHtml(htmlThree, mImageGetter, null));
  }
  /**加载网络图片*/
  private void loadNetPic(String... params) {
    String path = params[0];

    File file = new File(Environment.getExternalStorageDirectory(), picName);

    InputStream in = null;

    FileOutputStream out = null;

    try {
      URL url = new URL(path);

      HttpURLConnection connUrl = (HttpURLConnection) url.openConnection();

      connUrl.setConnectTimeout(5000);

      connUrl.setRequestMethod("GET");

      if(connUrl.getResponseCode() == 200) {

        in = connUrl.getInputStream();

        out = new FileOutputStream(file);

        byte[] buffer = new byte[1024];

        int len;

        while((len = in.read(buffer))!= -1){
          out.write(buffer, 0, len);
        }
      } else {
        Log.i(TAG, connUrl.getResponseCode() + "");
      }
    } catch (Exception e) {
      e.printStackTrace();
    } finally {

      if(in != null) {
        try {
          in.close();
        } catch (IOException e) {
          e.printStackTrace();
        }
      }
      if(out != null) {
        try {
          out.close();
        } catch (IOException e) {
          e.printStackTrace();
        }
      }
    }
  }
}