android - 如何将 SD 卡图像添加到 Coverflow？

Question

在此处输入图像描述这是我的可绘制封面流:(这是我的图像适配器代码

    /** 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;
}

}

你看，上面列出了 5 个可绘制对象。我想从文件夹中加载 5 个最后添加的图像。如何将 sdcard 图像添加到该代码中。

我正在尝试使用coverflow 显示最后拍摄的5 张照片。我希望有人能帮助我。

编辑（最后一个代码）：

    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;
    }
}

编辑 2：

它开始，然后从头开始显示 3 个项目。当我尝试查看 4+ 个项目时，它会停止。这是代码——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)

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

score 1 · Accepted Answer

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]);
            }
        }
}

您可以获取 sdcard 中某个文件夹下的文件路径。但请确保 sdcard 文件夹没有其他文件格式。然后将arraylist传递给您的适配器以在coverflow中显示相同的内容

要过滤 .png 文件，您可以使用以下内容

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

然后打电话

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());
    }
   }
  }  
 }    
 }

从发表的评论中，我假设您需要显示 sdcard 文件夹中的最后 5 个项目

         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));  
         }

你的适配器

 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);     
    }

  }

更新：

在 getFromSdcard() 中仅将最后 5 个文件路径添加到您的数组列表 f
您的列表视图项目数是 f.size()
要获取路径，您可以在 getview() 中使用 f.get(position)。

在 getFromSdcard()

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

在您的适配器中

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

在 getView

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

android - 如何将 SD 卡图像添加到 Coverflow？

1 回答 1

Related

Reference