How can i add sdcard images to coverflow?

2019-03-04 16:31发布

站内文章 / Android
54 0 0

问题:

Here is my coverflow with drawables :( This is my Image Adapter Code

    /** The Constant IMAGE_RESOURCE_IDS. */
private static final List<Integer> IMAGE_RESOURCE_IDS = new ArrayList<Integer>(DEFAULT_LIST_SIZE);

/** The Constant DEFAULT_RESOURCE_LIST. */
private static final int[] DEFAULT_RESOURCE_LIST = {
    R.drawable.promo_blue_bg_medium,
    R.drawable.promo_green_bg_medium,
    R.drawable.flow,
    R.drawable.promo_yellow_bg_medium,
    R.drawable.promo_black_bg_medium ,

};

/** The bitmap map. */
private final Map<Integer, WeakReference<Bitmap>> bitmapMap = new HashMap<Integer, WeakReference<Bitmap>>();

private final Context context;

/**
 * Creates the adapter with default set of resource images.
 * 
 * @param context
 *            context
 */
public ResourceImageAdapter(final Context context) {
    super();
    this.context = context;
    setResources(DEFAULT_RESOURCE_LIST);
}

/**
 * Replaces resources with those specified.
 * 
 * @param resourceIds
 *            array of ids of resources.
 */
public final synchronized void setResources(final int[] resourceIds) {



       String ExternalStorageDirectoryPath = Environment
         .getExternalStorageDirectory()
         .getAbsolutePath();

       String targetPath = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES).getAbsolutePath() + "/CamWay/";



       File targetDirector = new File(targetPath);


    IMAGE_RESOURCE_IDS.clear();
    for (final int resourceId : resourceIds) {
        IMAGE_RESOURCE_IDS.add(resourceId);
    }
    notifyDataSetChanged();
}

/*
 * (non-Javadoc)
 * 
 * @see android.widget.Adapter#getCount()
 */
@Override
public synchronized int getCount() {
    return IMAGE_RESOURCE_IDS.size();
}

/*
 * (non-Javadoc)
 * 
 * @see pl.polidea.coverflow.AbstractCoverFlowImageAdapter#createBitmap(int)
 */
@Override
protected Bitmap createBitmap(final int position) {
    Log.v(TAG, "creating item " + position);
    final Bitmap bitmap = ((BitmapDrawable) context.getResources().getDrawable(IMAGE_RESOURCE_IDS.get(position)))
            .getBitmap();
    bitmapMap.put(position, new WeakReference<Bitmap>(bitmap));
    return bitmap;
}

}

You see,5 drawable listed above.I wanna load 5 last added images from folder.How can i add sdcard images to that code.

I'm trying to showing 5 last taken photos with coverflow. I hope somebody can help me.

EDIT(last code):

    public class ResourceImageAdapter extends AbstractCoverFlowImageAdapter {

    //Dosya alımı başlangıç
     public class ImageAdapter extends BaseAdapter {

            private Context mContext;
            ArrayList<String> itemList = new ArrayList<String>();

            public ImageAdapter(Context c) {
             mContext = c; 
            }

            void add(String path){
             itemList.add(path); 
            }

         @Override
         public int getCount() {
          return itemList.size();
         }

         @Override
         public Object getItem(int position) {
          // TODO Auto-generated method stub
          return itemList.get(position);
         }

         @Override
         public long getItemId(int position) {
          // TODO Auto-generated method stub
          return 0;
         }

         @Override
         public View getView(int position, View convertView, ViewGroup parent) {
          ImageView imageView;
                if (convertView == null) {  // if it's not recycled, initialize some attributes
                    imageView = new ImageView(mContext);
                    imageView.setLayoutParams(new GridView.LayoutParams(220, 220));
                    imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
                    imageView.setPadding(8, 8, 8, 8);
                } else {
                    imageView = (ImageView) convertView;
                }

                Bitmap bm = decodeSampledBitmapFromUri(itemList.get(position), 220, 220);

                imageView.setImageBitmap(bm);
                return imageView;
         }

         public Bitmap decodeSampledBitmapFromUri(String path, int reqWidth, int reqHeight) {

          Bitmap bm = null;
          // First decode with inJustDecodeBounds=true to check dimensions
          final BitmapFactory.Options options = new BitmapFactory.Options();
          options.inJustDecodeBounds = true;
          BitmapFactory.decodeFile(path, options);

          // Calculate inSampleSize
          options.inSampleSize = calculateInSampleSize(options, reqWidth, reqHeight);

          // Decode bitmap with inSampleSize set
          options.inJustDecodeBounds = false;
          bm = BitmapFactory.decodeFile(path, options); 

          return bm;   
         }

         public int calculateInSampleSize(

          BitmapFactory.Options options, int reqWidth, int reqHeight) {
          // Raw height and width of image
          final int height = options.outHeight;
          final int width = options.outWidth;
          int inSampleSize = 1;

          if (height > reqHeight || width > reqWidth) {
           if (width > height) {
            inSampleSize = Math.round((float)height / (float)reqHeight);    
           } else {
            inSampleSize = Math.round((float)width / (float)reqWidth);    
           }   
          }

          return inSampleSize;    
         }

        }

           ImageAdapter myImageAdapter;

           //Burası Dosya alımı bitimi
    /** The Constant TAG. */
    private static final String TAG = ResourceImageAdapter.class.getSimpleName();

    /** The Constant DEFAULT_LIST_SIZE. */
    private static final int DEFAULT_LIST_SIZE = 20;

    /** The Constant IMAGE_RESOURCE_IDS. */
    private static final List<Integer> IMAGE_RESOURCE_IDS = new ArrayList<Integer>(DEFAULT_LIST_SIZE);

    /** The Constant DEFAULT_RESOURCE_LIST. */
    private static final int[] DEFAULT_RESOURCE_LIST = {
        R.drawable.promo_blue_bg_medium,
        R.drawable.promo_green_bg_medium,
        R.drawable.flow,
        R.drawable.promo_yellow_bg_medium,
        R.drawable.promo_black_bg_medium ,

    };
    private String[] mFileStrings;
    ArrayList<String> f = new ArrayList<String>();

   public void getFromSdcard()
   {
       File file=  new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES).getAbsolutePath() ,"CamWay");

           if (file.isDirectory())
           {
               File[] listFile = file.listFiles();//get list of filess
               mFileStrings = new String[listFile.length];

               for (int i = 0; i < listFile.length; i++)
               {
                   mFileStrings[i] = listFile[i].getAbsolutePath();
                   f.add(listFile[i].getAbsolutePath());//add path of files to array list
                   System.out.println("...................................."+mFileStrings[i]);
               }
           }
   }

    /** The bitmap map. */
    private final Map<Integer, WeakReference<Bitmap>> bitmapMap = new HashMap<Integer, WeakReference<Bitmap>>();

    private final Context context;

    /**
     * Creates the adapter with default set of resource images.
     * 
     * @param context
     *            context
     */
    public ResourceImageAdapter(final Context context) {
        super();
        this.context = context;
        setResources(DEFAULT_RESOURCE_LIST);
    }

    /**
     * Replaces resources with those specified.
     * 
     * @param resourceIds
     *            array of ids of resources.
     */
    public final synchronized void setResources(final int[] resourceIds) {



           String ExternalStorageDirectoryPath = Environment
             .getExternalStorageDirectory()
             .getAbsolutePath();

           String targetPath = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES).getAbsolutePath() + "/CamWay/";



           File targetDirector = new File(targetPath);


        IMAGE_RESOURCE_IDS.clear();
        for (final int resourceId : resourceIds) {
            IMAGE_RESOURCE_IDS.add(resourceId);
        }
        notifyDataSetChanged();
    }

    /*
     * (non-Javadoc)
     * 
     * @see android.widget.Adapter#getCount()
     */
    @Override
    public synchronized int getCount() {
        return IMAGE_RESOURCE_IDS.size();
    }

    /*
     * (non-Javadoc)
     * 
     * @see pl.polidea.coverflow.AbstractCoverFlowImageAdapter#createBitmap(int)
     */
    @Override
    protected Bitmap createBitmap(final int position) {
        Log.v(TAG, "creating item " + position);
        final Bitmap bitmap =  BitmapFactory.decodeFile(f.get(position));

        bitmapMap.put(position, new WeakReference<Bitmap>(bitmap));

        return bitmap;
    }
}

EDIT 2 :

it starts and then shows 3 items from beginning .when i try look 4+ item ,it stops. this is code -- getFromSdcard() ; int size= f.size()-5; //get the size of arraylist then decrease it by 5 //then loop from that point to your arraylist size //to get the last 5 items in the list for(int j=size;j<f.size();j++) { System.out.println("Position = "+j); System.out.println("Path of files"+f.get(j)); } final Bitmap bitmap = BitmapFactory.decodeFile(f.get(position)); bitmapMap.put(position, new WeakReference<Bitmap>(bitmap)); return bitmap;

04-06 21:41:05.013: E/AndroidRuntime(11217): at     com.project.smyrna.camway.ResourceImageAdapter.createBitmap(ResourceImageAdapter‌​.java:152)

--line is final Bitmap bitmap = BitmapFactory.decodeFile(f.get(position));

回答1:

private String[] mFileStrings;
 ArrayList<String> f = new ArrayList<String>();

public void getFromSdcard()
{
    File file=  new File(android.os.Environment.getExternalStorageDirectory(),"Your Sdcard");

        if (file.isDirectory())
        {
            listFile = file.listFiles();//get list of files
            for (int i = listFile.length-5; i < listFile.length; i++)
            {
                    //get the length decrease it 5 . loop to last 
                mFileStrings[i] = listFile[i].getAbsolutePath();
                f.add(listFile[i].getAbsolutePath());//add path of files to array list
                System.out.println("...................................."+mFileStrings[i]);
            }
        }
}

You can get the path of files under a folder in your sdcard. But make sure the sdcard folder does not have other file formats. Then pass the arraylist to your adapter to display the same in coverflow

To filter files that are .png you can use the below

 File dir= new File(android.os.Environment.getExternalStorageDirectory());

Then call

walkdir(dir);

ArrayList<String> filepath= new ArrayList<String>();//contains list of all files ending with 

public void walkdir(File dir) {
String Patternpng = ".png";

File listFile[] = dir.listFiles();

if (listFile != null) {
for (int i = 0; i < listFile.length; i++) {

if (listFile[i].isDirectory()) {
    walkdir(listFile[i]);
} else {
  if (listFile[i].getName().endsWith(Patternpng)){
      //Do what ever u want
      filepath.add( listFile[i].getAbsolutePath());
    }
   }
  }  
 }    
 }

From the comment made i assume you need to display last 5 items from your sdcard folder

         int  size= f.size()-5; 
         //get the size of arraylist then decrease it by 5
         //then loop from that point to your arraylist size 
         //to get the last 5 items in the list
         for(int j=size;j<f.size();j++)
         {
             System.out.println("Position = "+j);
             System.out.println("Path of files"+f.get(j));  
         }

Your adapter

 public class MyAdapter extends AbstractCoverFlowImageAdapter {


@Override
public int getCount() {
    // TODO Auto-generated method stub
    return f.size();
}

@Override
public Object getItem(int position) {
    // TODO Auto-generated method stub
    return position;
}

@Override
public long getItemId(int position) {
    // TODO Auto-generated method stub
    return 0;
}

   public View getView(int position, View convertView, ViewGroup parent) {
      //inflate layout
          //do something
          //use the edit 2 to get last 5 items in the arraylist.
          ImageView image=(ImageView)vi.findViewById(R.id.ivv);
          Bitmap b = BitmapFactory.decodeFile(f.get(position));
          image.setImageBitmap(b);     
    }

  }

UPDATE:

  1. Add only last 5 file paths to your arraylist f in getFromSdcard()

  2. Your listview item count is f.size()

  3. To get the paths you can use f.get(position) in getview().

In getFromSdcard()

        for (int i = listFile.length-5; i < listFile.length; i++)
         // add only last 5 file paths from your folder

In your adapter

@Override
 public int getCount() {
// TODO Auto-generated method stub
return f.size();
}

In getView

        ImageView image=(ImageView)vi.findViewById(R.id.ivv);
        Bitmap b = BitmapFactory.decodeFile(f.get(position));
        image.setImageBitmap(b);


标签： android image drawable android-sdcard coverflow
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