Android Open Source - SurveySDK_android Gallery

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License

The source code is released under:
Apache License
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Java Source Code

package com.survey.android.view;
//  w w w  .j a va 2  s  . co m
import java.io.File;
import java.util.ArrayList;
import java.util.List;
import com.survey.android.R;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.ProgressDialog;
import android.content.Context;
import android.content.Intent;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.media.MediaScannerConnection;
import android.net.Uri;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Handler;
import android.provider.MediaStore;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.View.OnClickListener;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.GridView;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;

@SuppressWarnings("unused")
public class Gallery extends Activity {
  public ImageAdapter imageAdapter;
  private final static int TAKE_IMAGE = 1;
  private final static int UPLOAD_IMAGES = 2;
  private final static int VIEW_IMAGE = 3;
  private Uri imageUri;
  private MediaScannerConnection mScanner;
  public GridView imagegrid;

  private long lastId;
  private List<ImageItem> images;
  private ImageItem currentSelectedII;
  private ViewHolder currentSelectedH;

  private Runnable alertRunnable;
  private AlertDialog alert;
  private Handler handler;
  private ProgressDialog pd;
  private TextView txtTitle;
  

  /** Called when the activity is first created. */
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.gallery);

    // *******************************************************************************
    handler = new Handler();
    alertRunnable = null; // explicit null
    images = new ArrayList<ImageItem>();
    // *******************************************************************************

    txtTitle=(TextView)findViewById(R.id.txtTitle);
    txtTitle.setText(R.string.gallery);
    
    final Button btnBack = (Button) findViewById(R.id.btnBack);
    final Button btnSelect = (Button) findViewById(R.id.selectBtn);

    (new ImageLoaderTask()).execute();

    btnBack.setOnClickListener(new OnClickListener() {
      @Override
      public void onClick(View v) {
        // finish();
        returnFromGallery();
      }
    });

    btnSelect.setOnClickListener(new OnClickListener() {
      public void onClick(View v) {
        if (currentSelectedII == null || currentSelectedII.selection==false) {
          Toast toast = Toast
              .makeText(Gallery.this,
                  R.string.please_select_one_photo,
                  Toast.LENGTH_LONG);
          toast.show();
        } else {
          returnFromGallery();
        }
      }
    });
  }

  public void updateUI() {
    imageAdapter.checkForNewImages();
  }

  private void returnFromGallery() {
    Intent resultData = new Intent();
    if (currentSelectedII != null) {
      resultData.putExtra("image_path", currentSelectedII.path);
      setResult(Activity.RESULT_OK, resultData);
    } else {
      setResult(RESULT_CANCELED, resultData);
    }
    finish();
  }

  public class ImageAdapter extends BaseAdapter {
    private LayoutInflater mInflater;

    public ImageAdapter() {
      mInflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    }

    @SuppressWarnings("deprecation")
    public void initialize() {
      images.clear();
      final String[] columns = { MediaStore.Images.Thumbnails._ID,
          MediaStore.Images.Media.DATA };
      final String orderBy = MediaStore.Images.Media._ID;
      Cursor imagecursor = managedQuery(
          MediaStore.Images.Media.EXTERNAL_CONTENT_URI, columns,
          null, null, orderBy);
      if (imagecursor != null) {
        int image_column_index = imagecursor
            .getColumnIndex(MediaStore.Images.Media._ID);

        int count = imagecursor.getCount();
        for (int i = 0; i < count-1; i++) {
          imagecursor.moveToPosition(i);
          int id = imagecursor.getInt(image_column_index);
          ImageItem imageItem = new ImageItem();
          imageItem.id = id;
          imageItem.path = imagecursor
              .getString(imagecursor
                  .getColumnIndexOrThrow(MediaStore.Images.Media.DATA));
          lastId = id;
          imageItem.img = MediaStore.Images.Thumbnails.getThumbnail(
              getApplicationContext().getContentResolver(), id,
              MediaStore.Images.Thumbnails.MICRO_KIND, null);
          images.add(imageItem);
        }
        imagecursor.close();
      }
      notifyDataSetChanged();
    }

    @SuppressWarnings("deprecation")
    public void checkForNewImages() {
      // Here we'll only check for newer images
      final String[] columns = { MediaStore.Images.Thumbnails._ID,
          MediaStore.Images.Media.DATA };
      final String orderBy = MediaStore.Images.Media._ID;
      Cursor imagecursor = managedQuery(
          MediaStore.Images.Media.EXTERNAL_CONTENT_URI, columns,
          MediaStore.Images.Media._ID + " > " + lastId, null, orderBy);
      int image_column_index = imagecursor
          .getColumnIndex(MediaStore.Images.Media._ID);
      int count = imagecursor.getCount();
      for (int i = 0; i < count; i++) {
        imagecursor.moveToPosition(i);
        int id = imagecursor.getInt(image_column_index);
        ImageItem imageItem = new ImageItem();
        imageItem.id = id;
        imageItem.path = imagecursor.getString(imagecursor
            .getColumnIndexOrThrow(MediaStore.Images.Media.DATA));
        lastId = id;
        imageItem.img = MediaStore.Images.Thumbnails.getThumbnail(
            getApplicationContext().getContentResolver(), id,
            MediaStore.Images.Thumbnails.MICRO_KIND, null);
        imageItem.selection = true; // newly added item will be selected
                      // by default
        images.add(imageItem);
      }
      imagecursor.close();
      notifyDataSetChanged();
    }

    public int getCount() {
      return images.size();
    }

    public Object getItem(int position) {
      return position;
    }

    public long getItemId(int position) {
      return position;
    }

    public View getView(final int position, View convertView,
        ViewGroup parent) {
      final ViewHolder holder;
      if (convertView == null) {
        holder = new ViewHolder();
        convertView = mInflater.inflate(R.layout.gallery_item, null);
        holder.imageview = (ImageView) convertView
            .findViewById(R.id.ivThumb);
        holder.checkbox = (CheckBox) convertView
            .findViewById(R.id.cbThumb);

        convertView.setTag(holder);
      } else {
        holder = (ViewHolder) convertView.getTag();
      }
      final ImageItem item = images.get(position);
      holder.checkbox.setId(position);
      holder.imageview.setId(position);
      holder.checkbox.setOnClickListener(new OnClickListener() {

        public void onClick(View v) {
          CheckBox cb = (CheckBox) v;
          int id = cb.getId();
          if (currentSelectedH != null
              && currentSelectedH.checkbox.getId() != position) {
            currentSelectedH.checkbox.setChecked(false);
            holder.checkbox.setChecked(true);
            images.get(holder.checkbox.getId()).selection=true;
            
          } else {
            if (images.get(id).selection) {
              cb.setChecked(false);
              images.get(id).selection = false;
            } else {
              cb.setChecked(true);
              images.get(id).selection = true;
            }
          }

          currentSelectedH = holder;
          currentSelectedII = item;

          // if (images.get(id).selection) {
          // cb.setChecked(false);
          // images.get(id).selection = false;
          // } else {
          // cb.setChecked(true);
          // images.get(id).selection = true;
          // }
        }
      });
      holder.imageview.setOnClickListener(new OnClickListener() {

        @SuppressWarnings("deprecation")
        public void onClick(View v) {
          int id = v.getId();
          ImageItem item = images.get(id);
          Intent intent = new Intent();
          intent.setAction(Intent.ACTION_VIEW);
          final String[] columns = { MediaStore.Images.Media.DATA };
          Cursor imagecursor = managedQuery(
              MediaStore.Images.Media.EXTERNAL_CONTENT_URI,
              columns, MediaStore.Images.Media._ID + " = "
                  + item.id, null,
              MediaStore.Images.Media._ID);
          if (imagecursor != null && imagecursor.getCount() > 0) {
            imagecursor.moveToPosition(0);
            String path = imagecursor.getString(imagecursor
                .getColumnIndexOrThrow(MediaStore.Images.Media.DATA));
            File file = new File(path);
            imagecursor.close();
            intent.setDataAndType(Uri.fromFile(file), "image/*");
            startActivityForResult(intent, VIEW_IMAGE);
          }
        }
      });
      holder.imageview.setImageBitmap(item.img);
      holder.checkbox.setChecked(item.selection);
      return convertView;
    }
  }

  private boolean isAnySelected(List<ImageItem> images) {
    if (images != null && images.size() != 0) {
      for (ImageItem img : images) {
        if (img.selection) {
          return true;
        }
      }
    }
    return false;
  }

  class ViewHolder {
    ImageView imageview;
    CheckBox checkbox;
  }

  class ImageItem {
    boolean selection;
    int id;
    String path;
    Bitmap img;
  }

  /**
   * Loads local images and call adapter initialization
   * 
   * @author dominum
   * 
   */
  private class ImageLoaderTask extends AsyncTask<Void, Void, Void> {
    @Override
    protected void onPreExecute() {
      pd = ProgressDialog.show(Gallery.this,
          getResources().getString(R.string.loading), getResources()
              .getString(R.string.please_wait), true, false);
      super.onPreExecute();
    }

    @Override
    protected Void doInBackground(Void... params) {
      try {
        imageAdapter = new ImageAdapter();
        imageAdapter.initialize();
        imagegrid = (GridView) findViewById(R.id.PhoneImageGrid);
        runOnUiThread(new Runnable() {

          @Override
          public void run() {
            imagegrid.setAdapter(imageAdapter);
          }
        });
      } catch (Exception e) {
        e.printStackTrace();
      }
      return null;
    }

    @Override
    protected void onPostExecute(Void result) {
      if (pd != null && pd.isShowing()) {
        pd.dismiss();
      }
      super.onPostExecute(result);
    }
  }
}
Java Source Code List
