Android Open Source - Android-Link-Preview Main

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Back to project page Android-Link-Preview.

License

The source code is released under:

Apache License

Java Source Code

package com.leocardz.link.preview;
/*w w w .j  a v a 2  s. c  o  m*/
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.graphics.Bitmap;
import android.net.Uri;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.support.v7.app.ActionBarActivity;
import android.view.KeyEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.view.inputmethod.InputMethodManager;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.CompoundButton.OnCheckedChangeListener;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.LinearLayout.LayoutParams;
import android.widget.TextView;
import android.widget.TextView.OnEditorActionListener;

import com.koushikdutta.urlimageviewhelper.UrlImageViewCallback;
import com.koushikdutta.urlimageviewhelper.UrlImageViewHelper;
import com.leocardz.link.preview.library.LinkPreviewCallback;
import com.leocardz.link.preview.library.SourceContent;
import com.leocardz.link.preview.library.TextCrawler;

import java.util.List;
import java.util.Random;

@SuppressWarnings("unused")
public class Main extends ActionBarActivity {

  private EditText editText, editTextTitlePost, editTextDescriptionPost;
  private Button submitButton, postButton, randomButton;

  private Context context;

  private TextCrawler textCrawler;
  private ViewGroup dropPreview, dropPost;

  private TextView previewAreaTitle, postAreaTitle;

  private String currentTitle, currentUrl, currentCannonicalUrl,
      currentDescription;

  private Bitmap[] currentImageSet;
  private Bitmap currentImage;
  private int currentItem = 0;
  private int countBigImages = 0;
  private boolean noThumb;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    context = this;

    setContentView(R.layout.main);

    editText = (EditText) findViewById(R.id.input);
    editTextTitlePost = null;
    editTextDescriptionPost = null;

    /** --- From ShareVia Intent */
    if (getIntent().getExtras() != null) {
      String shareVia = (String) getIntent().getExtras().get(
          Intent.EXTRA_TEXT);
      if (shareVia != null) {
        editText.setText(shareVia);
      }
    }
    if (getIntent().getAction() == Intent.ACTION_VIEW) {
      Uri data = getIntent().getData();
      String scheme = data.getScheme();
      String host = data.getHost();
      List<String> params = data.getPathSegments();
      String builded = scheme + "://" + host + "/";

      for (String string : params) {
        builded += string + "/";
      }

      if (data.getQuery() != null && !data.getQuery().equals("")) {
        builded = builded.substring(0, builded.length() - 1);
        builded += "?" + data.getQuery();
      }

      System.out.println(builded);

      editText.setText(builded);

    }
    /** --- */

    submitButton = (Button) findViewById(R.id.action_go);
    randomButton = (Button) findViewById(R.id.random);
    postButton = (Button) findViewById(R.id.post);

    previewAreaTitle = (TextView) findViewById(R.id.preview_area);
    postAreaTitle = (TextView) findViewById(R.id.post_area);

    /** Where the previews will be dropped */
    dropPreview = (ViewGroup) findViewById(R.id.drop_preview);

    /** Where the previews will be dropped */
    dropPost = (ViewGroup) findViewById(R.id.drop_post);

    textCrawler = new TextCrawler();

    initSubmitButton();
    initPostButton();
    initRandomButton();

  }

  /** Adding listener to the random button */
  private void initRandomButton() {
    randomButton.setOnClickListener(new OnClickListener() {

      @Override
      public void onClick(View arg0) {
        editText.setText("");
        editText.setText(getRandomUrl());
      }
    });
  }

  /** Adding listener to the post button */
  private void initPostButton() {
    postButton.setOnClickListener(new OnClickListener() {

      @Override
      public void onClick(View v) {
        postAreaTitle.setVisibility(View.VISIBLE);
        previewAreaTitle.setVisibility(View.GONE);
        postButton.setVisibility(View.GONE);
        submitButton.setEnabled(true);

        /** Inflating the preview layout */
        View mainView = getLayoutInflater().inflate(R.layout.main_view,
            null);

        LinearLayout linearLayout = (LinearLayout) mainView
            .findViewById(R.id.external);

        /**
         * Inflating the post content
         */
        final View content = getLayoutInflater().inflate(
            R.layout.post_content, linearLayout);

        /** Fullfilling the content layout */
        final LinearLayout infoWrap = (LinearLayout) content
            .findViewById(R.id.info_wrap);

        final TextView contentTextView = (TextView) content
            .findViewById(R.id.post_content);
        final ImageView imageView = (ImageView) content
            .findViewById(R.id.image_post);
        final TextView titleTextView = (TextView) content
            .findViewById(R.id.title);

        final TextView urlTextView = (TextView) content
            .findViewById(R.id.url);
        final TextView descriptionTextView = (TextView) content
            .findViewById(R.id.description);

        contentTextView.setText(TextCrawler.extendedTrim(editText
            .getText().toString()));

        if (currentImage != null && !noThumb) {
          imageView.setImageBitmap(currentImage);
        } else {
          showHideImage(imageView, infoWrap, false);
        }

        if (!currentTitle.equals(""))
          titleTextView.setText(currentTitle);
        else
          titleTextView.setVisibility(View.GONE);

        if (!currentDescription.equals(""))
          descriptionTextView.setText(currentDescription);
        else
          descriptionTextView.setVisibility(View.GONE);

        urlTextView.setText(currentCannonicalUrl);

        mainView.setOnClickListener(new OnClickListener() {

          @Override
          public void onClick(View arg0) {
            String url = currentUrl;
            Intent i = new Intent(Intent.ACTION_VIEW);
            i.setData(Uri.parse(url));
            startActivity(i);
          }
        });

        dropPost.addView(mainView, 0);
        dropPreview.removeAllViews();
      }
    });
  }

  /** Adding listener to the button */
  public void initSubmitButton() {
    submitButton.setOnClickListener(new OnClickListener() {

      @Override
      public void onClick(View arg0) {

        textCrawler
            .makePreview(callback, editText.getText().toString());
        // , TextCrawler.NONE);
      }
    });
  }

  /** Callback to update your view. Totally customizable. */
  /** onPre() will be called before the crawling. onPos() after. */
  /** You can customize this to update your view */
  private LinkPreviewCallback callback = new LinkPreviewCallback() {
    /**
     * This view is used to be updated or added in the layout after getting
     * the result
     */
    private View mainView;
    private LinearLayout linearLayout;
    private View loading;
    private ImageView imageView;

    @Override
    public void onPre() {
      hideSoftKeyboard();

      currentImageSet = null;
      currentItem = 0;

      postButton.setVisibility(View.GONE);
      previewAreaTitle.setVisibility(View.VISIBLE);

      currentImage = null;
      noThumb = false;
      currentTitle = currentDescription = currentUrl = currentCannonicalUrl = "";

      submitButton.setEnabled(false);

      /** Inflating the preview layout */
      mainView = getLayoutInflater().inflate(R.layout.main_view, null);

      linearLayout = (LinearLayout) mainView.findViewById(R.id.external);

      /**
       * Inflating a loading layout into Main View LinearLayout
       */
      loading = getLayoutInflater().inflate(R.layout.loading,
          linearLayout);

      dropPreview.addView(mainView);
    }

    @Override
    public void onPos(final SourceContent sourceContent, boolean isNull) {

      /** Removing the loading layout */
      linearLayout.removeAllViews();

      if (isNull || sourceContent.getFinalUrl().equals("")) {
        /**
         * Inflating the content layout into Main View LinearLayout
         */
        View failed = getLayoutInflater().inflate(R.layout.failed,
            linearLayout);

        TextView titleTextView = (TextView) failed
            .findViewById(R.id.text);
        titleTextView.setText(getString(R.string.failed_preview) + "\n"
            + sourceContent.getFinalUrl());

        failed.setOnClickListener(new OnClickListener() {

          @Override
          public void onClick(View arg0) {
            releasePreviewArea();
          }
        });

      } else {
        postButton.setVisibility(View.VISIBLE);

        currentImageSet = new Bitmap[sourceContent.getImages().size()];

        /**
         * Inflating the content layout into Main View LinearLayout
         */
        final View content = getLayoutInflater().inflate(
            R.layout.preview_content, linearLayout);

        /** Fullfilling the content layout */
        final LinearLayout infoWrap = (LinearLayout) content
            .findViewById(R.id.info_wrap);
        final LinearLayout titleWrap = (LinearLayout) infoWrap
            .findViewById(R.id.title_wrap);
        final LinearLayout thumbnailOptions = (LinearLayout) content
            .findViewById(R.id.thumbnail_options);
        final LinearLayout noThumbnailOptions = (LinearLayout) content
            .findViewById(R.id.no_thumbnail_options);

        final ImageView imageSet = (ImageView) content
            .findViewById(R.id.image_post_set);

        final TextView close = (TextView) titleWrap
            .findViewById(R.id.close);
        final TextView titleTextView = (TextView) titleWrap
            .findViewById(R.id.title);
        final EditText titleEditText = (EditText) titleWrap
            .findViewById(R.id.input_title);
        final TextView urlTextView = (TextView) content
            .findViewById(R.id.url);
        final TextView descriptionTextView = (TextView) content
            .findViewById(R.id.description);
        final EditText descriptionEditText = (EditText) content
            .findViewById(R.id.input_description);
        final TextView countTextView = (TextView) thumbnailOptions
            .findViewById(R.id.count);
        final CheckBox noThumbCheckBox = (CheckBox) noThumbnailOptions
            .findViewById(R.id.no_thumbnail_checkbox);
        final Button previousButton = (Button) thumbnailOptions
            .findViewById(R.id.post_previous);
        final Button forwardButton = (Button) thumbnailOptions
            .findViewById(R.id.post_forward);

        editTextTitlePost = titleEditText;
        editTextDescriptionPost = descriptionEditText;

        titleTextView.setOnClickListener(new OnClickListener() {

          @Override
          public void onClick(View arg0) {
            titleTextView.setVisibility(View.GONE);

            titleEditText.setText(TextCrawler
                .extendedTrim(titleTextView.getText()
                    .toString()));
            titleEditText.setVisibility(View.VISIBLE);
          }
        });
        titleEditText
            .setOnEditorActionListener(new OnEditorActionListener() {

              @Override
              public boolean onEditorAction(TextView arg0,
                  int arg1, KeyEvent arg2) {

                if (arg2.getKeyCode() == KeyEvent.KEYCODE_ENTER) {
                  titleEditText.setVisibility(View.GONE);

                  currentTitle = TextCrawler
                      .extendedTrim(titleEditText
                          .getText().toString());

                  titleTextView.setText(currentTitle);
                  titleTextView.setVisibility(View.VISIBLE);

                  hideSoftKeyboard();
                }

                return false;
              }
            });
        descriptionTextView.setOnClickListener(new OnClickListener() {

          @Override
          public void onClick(View arg0) {
            descriptionTextView.setVisibility(View.GONE);

            descriptionEditText.setText(TextCrawler
                .extendedTrim(descriptionTextView.getText()
                    .toString()));
            descriptionEditText.setVisibility(View.VISIBLE);
          }
        });
        descriptionEditText
            .setOnEditorActionListener(new OnEditorActionListener() {

              @Override
              public boolean onEditorAction(TextView arg0,
                  int arg1, KeyEvent arg2) {

                if (arg2.getKeyCode() == KeyEvent.KEYCODE_ENTER) {
                  descriptionEditText
                      .setVisibility(View.GONE);

                  currentDescription = TextCrawler
                      .extendedTrim(descriptionEditText
                          .getText().toString());

                  descriptionTextView
                      .setText(currentDescription);
                  descriptionTextView
                      .setVisibility(View.VISIBLE);

                  hideSoftKeyboard();
                }

                return false;
              }
            });

        close.setOnClickListener(new OnClickListener() {

          @Override
          public void onClick(View arg0) {
            releasePreviewArea();
          }
        });

        noThumbCheckBox
            .setOnCheckedChangeListener(new OnCheckedChangeListener() {

              @Override
              public void onCheckedChanged(CompoundButton arg0,
                  boolean arg1) {
                noThumb = arg1;

                if (sourceContent.getImages().size() > 1)
                  if (noThumb)
                    thumbnailOptions
                        .setVisibility(View.GONE);
                  else
                    thumbnailOptions
                        .setVisibility(View.VISIBLE);

                showHideImage(imageSet, infoWrap, !noThumb);
              }
            });

        previousButton.setEnabled(false);
        previousButton.setOnClickListener(new OnClickListener() {

          @Override
          public void onClick(View arg0) {
            if (currentItem > 0)
              changeImage(previousButton, forwardButton,
                  currentItem - 1, sourceContent,
                  countTextView, imageSet, sourceContent
                      .getImages().get(currentItem - 1),
                  currentItem);
          }
        });
        forwardButton.setOnClickListener(new OnClickListener() {

          @Override
          public void onClick(View arg0) {
            if (currentItem < sourceContent.getImages().size() - 1)
              changeImage(previousButton, forwardButton,
                  currentItem + 1, sourceContent,
                  countTextView, imageSet, sourceContent
                      .getImages().get(currentItem + 1),
                  currentItem);
          }
        });

        if (sourceContent.getImages().size() > 0) {

          if (sourceContent.getImages().size() > 1) {
            countTextView.setText("1 " + getString(R.string.of)
                + " " + sourceContent.getImages().size());

            thumbnailOptions.setVisibility(View.VISIBLE);
          }
          noThumbnailOptions.setVisibility(View.VISIBLE);

          UrlImageViewHelper.setUrlDrawable(imageSet, sourceContent
              .getImages().get(0), new UrlImageViewCallback() {

            @Override
            public void onLoaded(ImageView imageView,
                Bitmap loadedBitmap, String url,
                boolean loadedFromCache) {
              if (loadedBitmap != null) {
                currentImage = loadedBitmap;
                currentImageSet[0] = loadedBitmap;
              }
            }
          });

        } else {
          showHideImage(imageSet, infoWrap, false);
        }

        if (sourceContent.getTitle().equals(""))
          sourceContent.setTitle(getString(R.string.enter_title));
        if (sourceContent.getDescription().equals(""))
          sourceContent
              .setDescription(getString(R.string.enter_description));

        titleTextView.setText(sourceContent.getTitle());
        urlTextView.setText(sourceContent.getCannonicalUrl());
        descriptionTextView.setText(sourceContent.getDescription());

        postButton.setVisibility(View.VISIBLE);
      }

      currentTitle = sourceContent.getTitle();
      currentDescription = sourceContent.getDescription();
      currentUrl = sourceContent.getUrl();
      currentCannonicalUrl = sourceContent.getCannonicalUrl();
    }
  };

  /** Change the current image in image set */
  private void changeImage(Button previousButton, Button forwardButton,
      final int index, SourceContent sourceContent,
      TextView countTextView, ImageView imageSet, String url,
      final int current) {

    if (currentImageSet[index] != null) {
      currentImage = currentImageSet[index];
      imageSet.setImageBitmap(currentImage);
    } else {
      UrlImageViewHelper.setUrlDrawable(imageSet, url,
          new UrlImageViewCallback() {

            @Override
            public void onLoaded(ImageView imageView,
                Bitmap loadedBitmap, String url,
                boolean loadedFromCache) {
              if (loadedBitmap != null) {
                currentImage = loadedBitmap;
                currentImageSet[index] = loadedBitmap;
              }
            }
          });
    }

    currentItem = index;

    if (index == 0)
      previousButton.setEnabled(false);
    else
      previousButton.setEnabled(true);

    if (index == sourceContent.getImages().size() - 1)
      forwardButton.setEnabled(false);
    else
      forwardButton.setEnabled(true);

    countTextView.setText((index + 1) + " " + getString(R.string.of) + " "
        + sourceContent.getImages().size());
  }

  /** Show or hide the image layout according to the "No Thumbnail" ckeckbox */
  private void showHideImage(View image, View parent, boolean show) {
    if (show) {
      image.setVisibility(View.VISIBLE);
      parent.setPadding(5, 5, 5, 5);
      parent.setLayoutParams(new LayoutParams(0,
          LayoutParams.WRAP_CONTENT, 2f));
    } else {
      image.setVisibility(View.GONE);
      parent.setPadding(5, 5, 5, 5);
      parent.setLayoutParams(new LayoutParams(0,
          LayoutParams.WRAP_CONTENT, 3f));
    }
  }

  /** Hide keyboard */
  private void hideSoftKeyboard() {
    hideSoftKeyboard(editText);

    if (editTextTitlePost != null)
      hideSoftKeyboard(editTextTitlePost);
    if (editTextDescriptionPost != null)
      hideSoftKeyboard(editTextDescriptionPost);
  }

  private void hideSoftKeyboard(EditText editText) {
    InputMethodManager inputMethodManager = (InputMethodManager) getSystemService(Activity.INPUT_METHOD_SERVICE);
    inputMethodManager
        .hideSoftInputFromWindow(editText.getWindowToken(), 0);
  }

  /** Just a set of urls */
  private final String[] RANDOM_URLS = {
      "http://vnexpress.net/ ",
      "http://facebook.com/ ",
      "http://gmail.com",
      "http://goo.gl/jKCPgp",
      "http://www3.nhk.or.jp/",
      "http://habrahabr.ru",
      "http://www.youtube.com/watch?v=cv2mjAgFTaI",
      "http://vimeo.com/67992157",
      "https://lh6.googleusercontent.com/-aDALitrkRFw/UfQEmWPMQnI/AAAAAAAFOlQ/mDh1l4ej15k/w337-h697-no/db1969caa4ecb88ef727dbad05d5b5b3.jpg",
      "http://www.nasa.gov/", "http://twitter.com",
      "http://bit.ly/14SD1eR" };

  /** Returns a random url */
  private String getRandomUrl() {
    int random = new Random().nextInt(RANDOM_URLS.length);
    return RANDOM_URLS[random];
  }

  private void releasePreviewArea() {
    submitButton.setEnabled(true);
    postButton.setVisibility(View.GONE);
    previewAreaTitle.setVisibility(View.GONE);
    dropPreview.removeAllViews();
  }
}

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