Android Open Source - MarkdownView Markdown View

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License

The source code is released under:

Apache License

Java Source Code

package us.feras.mdv;
/*  www.  j av a  2 s .  com*/
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

import us.feras.mdv.util.HttpHelper;

import android.content.Context;
import android.os.AsyncTask;
import android.util.AttributeSet;
import android.webkit.WebView;

import com.petebevin.markdown.MarkdownProcessor;

/**
 * @author Feras Alnatsheh
 */
public class MarkdownView extends WebView {

  public MarkdownView(Context context, AttributeSet attrs) {
    super(context, attrs);
  }

  public MarkdownView(Context context) {
    super(context);
  }

  /**
   * Loads the given Markdown text to the view as rich formatted HTML. The
   * HTML output will be styled based on the given CSS file.
   * 
   * @param txt
   *            - input in markdown format
   * @param cssFileUrl
   *            - a URL to css File. If the file located in the project assets
   *            folder then the URL should start with "file:///android_asset/"
   */
  public void loadMarkdown(String txt, String cssFileUrl) {
    loadMarkdownToView(txt, cssFileUrl);
  }

  /**
   * Loads the given Markdown text to the view as rich formatted HTML.
   * 
   * @param txt
   *            - input in Markdown format
   */
  public void loadMarkdown(String txt) {
    loadMarkdown(txt, null);
  }

  /**
   * Loads the given Markdown file to the view as rich formatted HTML. The HTML
   * output will be styled based on the given CSS file.
   * 
   * @param url
   *            - a URL to the Markdown file. If the file located in the
   *            project assets folder then the URL should start with
   *            "file:///android_asset/"
   * @param cssFileUrl
   *            - a URL to css File. If the file located in the project assets
   *            folder then the URL should start with "file:///android_asset/"
   */
  public void loadMarkdownFile(String url, String cssFileUrl) {
    new LoadMarkdownUrlTask().execute(url, cssFileUrl);
  }

  public void loadMarkdownFile(String url) {
    loadMarkdownFile(url, null);
  }

  private String readFileFromAsset(String url) throws IOException {
    BufferedReader input = null;
    StringBuilder contents = new StringBuilder();
    try {
      String assetFileName = url.substring(url.lastIndexOf('/') + 1,
          url.length());
      input = new BufferedReader(new InputStreamReader(getContext()
          .getAssets().open(assetFileName)));
      String line = null;
      while ((line = input.readLine()) != null) {
        contents.append(line);
        contents.append(System.getProperty("line.separator"));
      }
      return contents.toString();
    } finally {
      try {
        input.close();
      } catch (IOException e) {
      }
    }
  }

  private class LoadMarkdownUrlTask extends
      AsyncTask<String, Integer, String> {
    private String cssFileUrl;

    protected String doInBackground(String... params) {
      try {
        String txt = "";
        String url = params[0];
        this.cssFileUrl = params[1];
        if (url.startsWith("file:///android_asset")) {
          txt = readFileFromAsset(url);
        } else {
          txt = HttpHelper.get(url).getResponseMessage();
        }
        return txt;
      } catch (Exception ex) {
      }
      return null;
    }

    protected void onProgressUpdate(Integer... progress) {
      // no-op
    }

    protected void onPostExecute(String result) {
      if (result != null) {
        loadMarkdownToView(result, cssFileUrl);
      } else {
        loadUrl("about:blank");
      }
    }
  }

  private void loadMarkdownToView(String txt, String cssFileUrl) {
    MarkdownProcessor m = new MarkdownProcessor();
    String html = m.markdown(txt);
    if (cssFileUrl != null) {
      html = String.format(
          "<link rel=\"stylesheet\" type=\"text/css\" href=\"%s\" />"
              + html, cssFileUrl);
    }
    loadDataWithBaseURL("fake://", html, "text/html", "UTF-8", null);
  }

}

Java Source Code List

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