Android Open Source - AsciiCamera Library Activity

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From Project

Back to project page AsciiCamera.

License

The source code is released under:

Apache License

Java Source Code

// Copyright (C) 2014 Bruno Ramalhete
//from  ww w . j a v  a 2  s .c  o m
package com.spectralsoftware.asciicamera;

import java.io.File;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import com.spectralsoftware.util.AsyncImageLoader;
import com.spectralsoftware.util.ScaledBitmapCache;

import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.GridView;
import android.widget.ImageView;
import android.widget.SimpleAdapter;
import android.widget.AdapterView.OnItemClickListener;

/** 
 * Activity which displays all pictures the user has taken in a scrolling grid. Selecting an image opens it
 * in a ViewImageActivity.
 */
public class LibraryActivity extends Activity {
    
    static int CELL_WIDTH = 92;
    static int CELL_HEIGHT = 69;
    
    String imageDirectory;
    
    GridView gridView;
    int selectedGridIndex;
    
    List imageMaps = new ArrayList();
    static String IMAGE_URI_KEY = "imageUri";
    
    // A cache of scaled Bitmaps for the image files, so we can avoid reloading them as the user scrolls.
    ScaledBitmapCache bitmapCache;
    AsyncImageLoader imageLoader = new AsyncImageLoader();
    
    public static Intent intentWithImageDirectory(Context parent, String imageDirectory, String thumbnailDirectory) {
        Intent intent = new Intent(parent, LibraryActivity.class);
        intent.putExtra("imageDirectory", imageDirectory);
        intent.putExtra("thumbnailDirectory", thumbnailDirectory);
        return intent;
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.library_list);
        
        imageDirectory = getIntent().getStringExtra("imageDirectory");
        bitmapCache = new ScaledBitmapCache(this, getIntent().getStringExtra("thumbnailDirectory"));
        
        gridView = (GridView) findViewById(R.id.gridview);
        gridView.setOnItemClickListener(new OnItemClickListener() {
            public void onItemClick(AdapterView parent, View view, int position, long id) {
                selectedGridIndex = position;
                ViewImageActivity.startActivityWithImageURI(LibraryActivity.this, 
                        (Uri)((Map)imageMaps.get(position)).get(IMAGE_URI_KEY), "image/jpeg");
            }
        });
        readImageThumbnails();
        displayGrid();
    }
    
    void readImageThumbnails() {
        List<File> files = Collections.emptyList();
        File dir = new File(imageDirectory);
        if (dir.isDirectory()) {
            files = Arrays.asList(dir.listFiles());
        }
        Collections.sort(files);
        Collections.reverse(files);

        // look for foo.png in the foo directory
        imageMaps.clear();
        for(File fileDir : files) {
            if (fileDir.isDirectory()) {
                File pngFile = new File(fileDir, fileDir.getName()+".png");
                if (pngFile.isFile()) {
                    Uri imageUri = Uri.fromFile(pngFile);
                    Map dmap = new HashMap();
                    dmap.put(IMAGE_URI_KEY, imageUri);
                    imageMaps.add(dmap);
                }
            }
        }
    }
    
    void displayGrid() {
        SimpleAdapter adapter = new SimpleAdapter(this, imageMaps, 
                R.layout.library_cell, 
                new String[] {IMAGE_URI_KEY}, 
                new int[] {R.id.grid_image});
        adapter.setViewBinder(new SimpleAdapter.ViewBinder() {
            public boolean setViewValue(View view, Object data, String textRepresentation) {
                Uri imageUri = (Uri)data;
                imageLoader.loadImageIntoViewAsync(bitmapCache, imageUri, (ImageView)view, CELL_WIDTH, CELL_HEIGHT, getResources());
                return true;
            }
        });
        gridView.setAdapter(adapter);
        
        // show text message if no images available
        View noImagesView = findViewById(R.id.noImagesTextView);
        noImagesView.setVisibility(imageMaps.size()>0 ? View.GONE : View.VISIBLE);
    }
    
    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        if (resultCode==ViewImageActivity.DELETE_RESULT) {
            bitmapCache.removeUri((Uri)((Map)imageMaps.get(selectedGridIndex)).get(IMAGE_URI_KEY));
            imageMaps.remove(selectedGridIndex);
            displayGrid();
        }
    }

}

Java Source Code List

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