Android Open Source - android Gallery Fragment

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License

The source code is released under:

MIT License

Java Source Code

package com.felina.android;
/*from w  w  w .j a v a2 s .  c  o  m*/
import java.io.File;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date;

import android.content.Context;
import android.content.Intent;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.support.v4.app.LoaderManager;
import android.support.v4.content.CursorLoader;
import android.support.v4.content.Loader;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.GridView;
import android.widget.ImageView;

import com.actionbarsherlock.app.SherlockFragment;

public class GalleryFragment extends SherlockFragment implements LoaderManager.LoaderCallbacks<Cursor>  {
  
  private static final int IMAGE_LOADER = 0;
  private static final String IMAGE = "image";
  private static final String CHECKBOX = "checkbox";
  public static final String EXTRA_SELECTION = "extra_selection";
  public static final String EXTRA_PATHS = "extra_paths";
  private LoaderManager.LoaderCallbacks<Cursor> mCallbacks;
  private GridView gallery;
  private int count;
  private Bitmap[] thumbnails;
  private String[] paths;
  private boolean[] selection;
  private GalleryAdapter mAdapter;  
  private int selectedCount;
  private Button uploadBtn;
  private ImageView cameraBtn;
  private Button selectBtn;
  public static String mImagePath;
  
  private OnClickListener mBtnListener = new View.OnClickListener() {
    
    @Override
    public void onClick(View v) {
      switch(v.getId()) {
      case R.id.cameraBtn:
        takePicture();
        break;
        
      case R.id.uploadBtn:
        uploadImages();
        break;
        
      case R.id.selectBtn:
      }
      
    }
  };

  @Override
  public View onCreateView(LayoutInflater inflater, ViewGroup container,
      Bundle savedInstanceState) {
    View rootView = inflater.inflate(R.layout.gallery_fragment, container, false);
    
    mCallbacks = this;
    getSherlockActivity().getSupportLoaderManager().initLoader(IMAGE_LOADER, null, mCallbacks);

    gallery = (GridView) rootView.findViewById(R.id.imageGrid);
    uploadBtn = (Button) rootView.findViewById(R.id.uploadBtn);
    cameraBtn = (ImageView) rootView.findViewById(R.id.cameraBtn);
    selectBtn = (Button) rootView.findViewById(R.id.selectBtn);

    uploadBtn.setOnClickListener(mBtnListener);
    cameraBtn.setOnClickListener(mBtnListener);
    selectBtn.setOnClickListener(mBtnListener);

    uploadBtn.setEnabled(false);
    
    selectedCount = 0;
    
    mAdapter = new GalleryAdapter();
    gallery.setAdapter(mAdapter);
        
    return rootView;
  }
  

     public void takePicture() {
      Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
      
      if(intent.resolveActivity(getActivity().getPackageManager()) != null) {
        File f = null;
        try {
          f = createFile();
        } catch (IOException e) {
          System.out.println(e);
          System.exit(0);
        }
        
        if (f != null) {
          intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(f));
          getActivity().startActivityForResult(intent, Constants.REQUEST_IMAGE_CAPTURE);
        }
      }
    }
     

  private File createFile() throws IOException {
    String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
    File dir = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES);
    File image = new File(dir, timeStamp+".jpg");
    mImagePath = image.getAbsolutePath();
    return image;
  }

  private void uploadImages() {
    ImageUploader mUploader = new ImageUploader(getActivity(), selection, paths);
    mUploader.execute();
  }
  

  @Override
  public void onActivityResult(int requestCode, int resultCode, Intent data) {
    Log.d("CAMERARESULT: ", "got something "+requestCode );    
  }

  @Override
  public Loader<Cursor> onCreateLoader(int loaderID, Bundle bundle) {
    Uri mDataUrl = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
    String[] mProjection = {MediaStore.Images.Media.DATA, MediaStore.Images.Media._ID };
    String mSortOrder = MediaStore.Images.Media.DATE_TAKEN;
    
    switch (loaderID) {
        case IMAGE_LOADER:
            // Returns a new CursorLoader
            return new CursorLoader(
                        getActivity(),   // Parent activity context
                        mDataUrl,        // Table to query
                        mProjection,     // Projection to return
                        null,            // No selection clause
                        null,            // No selection arguments
                        mSortOrder             // Default sort order
                );
        default:
            // An invalid id was passed in
            return null;
    }
    }

  @Override
  public void onLoadFinished(Loader<Cursor> loader, Cursor mCursor) {
    // TODO Auto-generated method stub
    final Cursor c = mCursor;
    switch (loader.getId()) {
        case IMAGE_LOADER: 
          new Thread(new Runnable() {
        
        @Override
        public void run() {
          // TODO Auto-generated method stub
              processCursor(c);
        }
      }).start();
          break;
    }
    
  }

  @Override
  public void onLoaderReset(Loader<Cursor> arg0) {
    // TODO Auto-generated method stub
    
  }
  
  private void processCursor(Cursor mCursor) {
    int idColIndex = mCursor.getColumnIndex(MediaStore.Images.Media._ID);
    count = mCursor.getCount();
    paths = new String[count];
    thumbnails = new Bitmap[count];
    selection = new boolean[count];
    for (int i = 0; i < count; i++) {
      mCursor.moveToPosition(i);
      int id = mCursor.getInt(idColIndex);
      int dataColIndex = mCursor.getColumnIndex(MediaStore.Images.Media.DATA);
      thumbnails[i] = MediaStore.Images.Thumbnails.getThumbnail(getActivity().getContentResolver(), 
          id, MediaStore.Images.Thumbnails.MINI_KIND, null);
      paths[i] = mCursor.getString(dataColIndex);
      selection[i] = false;
    }
    
    gallery.post(new Runnable() {
      @Override
      public void run() {
        // TODO Auto-generated method stub
        mAdapter.notifyDataSetChanged();
      }
    });
  }

  
  public class GalleryAdapter extends BaseAdapter {
    private LayoutInflater mInflater;
    private OnClickListener mListener = new OnClickListener() {
      
      @Override
      public void onClick(View v) {
        // TODO Auto-generated method stub
        int id = v.getId();
        if(v.getTag().equals(IMAGE)) {
          Intent intent = new Intent();
          intent.setAction(Intent.ACTION_VIEW);
          intent.setDataAndType(Uri.parse("file://" + paths[id]), "image/*");
          startActivity(intent);
        }
        else if(v.getTag().equals(CHECKBOX)) {
          CheckBox checkBox = (CheckBox) v;
          if(selection[id]) {
            selection[id] = false;
            checkBox.setChecked(false);
            selectedCount--;
          }
          else {
            selection[id] = true;
            checkBox.setChecked(true);
            selectedCount++;
          }
          uploadBtn.setEnabled(selectedCount>0);
        }  
      }
    };
    
    public GalleryAdapter() {
      mInflater = (LayoutInflater) getActivity().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    }
    
    @Override
    public int getCount() {
      return count;
    }

    @Override
    public Object getItem(int i) {
      return i;
    }

    @Override
    public long getItemId(int i) {
      return i;
    }

    @Override
    public View getView(int i, View view, ViewGroup parent) {
      ImageView imageView;
      CheckBox checkBox;
      view = mInflater.inflate(R.layout.gallery_item, null);
      imageView = (ImageView) view.findViewById(R.id.imageThumb);
      checkBox = (CheckBox) view.findViewById(R.id.checkBox);
      
      imageView.setImageBitmap(thumbnails[i]);
      imageView.setOnClickListener(mListener);
      imageView.setId(i);
      imageView.setTag(IMAGE);
      
      checkBox.setChecked(selection[i]);
      checkBox.setOnClickListener(mListener);
      checkBox.setTag(CHECKBOX);
      checkBox.setId(i);
      return view;
    }
    
  }
}

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