ギャラリーから画像を動的にアンロードするにはどうすればよいですか？

Question

私はカスタムImageViewの持っている：ギャラリーへ

public class ShadowedImageView extends ImageView { 

private Paint mPaint; 
public Bitmap bitmap = null; 
private Bitmap tempBitmap; 
private Bitmap thumb; 
private Bitmap image; 
public float shadowRadius = 2f; 
public float shadowDx = 1f; 
public float shadowDy = 1f; 
public int shadowColor = Color.BLACK; 
public int scale = 1; 
public int requiredWidth = 768; 
public int requiredHeight = 1024; 
public int loaded = 0; 

public ShadowedImageView(Context context) { 
    super(context); 
    setShadow(); 
    loaded = 0; 
} 

public ShadowedImageView(Context context, AttributeSet attrs){ 
    super(context, attrs); 
    setShadow(); 
    loaded = 0; 
} 

public void setShadow(){ 
    mPaint = new Paint(); 
    mPaint.setAntiAlias(true); 
    mPaint.setShadowLayer(shadowRadius, shadowDx, shadowDy, shadowColor); 
    Resources res = getResources(); 
    Drawable drawable = res.getDrawable(R.drawable.pl); 
    bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.pl); 
    setImageDrawable(drawable); 
} 

public void refreshShadow(){ 
    mPaint = new Paint(); 
    mPaint.setAntiAlias(true); 
    mPaint.setShadowLayer(shadowRadius, shadowDx, shadowDy, shadowColor); 
} 

@Override 
protected void onDraw(Canvas canvas) { 
    super.onDraw(canvas); 
} 

@Override 
protected void onMeasure(int w, int h) { 
    super.onMeasure(w,h); 

    int mH, mW; 
    mW = getSuggestedMinimumWidth() < getMeasuredWidth()? getMeasuredWidth() : getSuggestedMinimumWidth(); 
    mH = getSuggestedMinimumHeight() < getMeasuredHeight()? getMeasuredHeight() : getSuggestedMinimumHeight(); 
    setMeasuredDimension(mW + 5, mH + 5); 

} 

public void downloadThumb(final Publication pub){ 
    OnClickListener theCommonListener = new OnClickListener(){ 
     @Override 
     public void onClick(View v) {    
      Intent intent = new Intent(v.getContext(), PublicationReader.class); 
      intent.putExtra("pubUrl", pub.publicationUrl); 
      intent.putExtra("pubPages", pub.publicationPages); 
      intent.putExtra("pubId", pub.id); 

      v.getContext().startActivity(intent); 
     } 
    }; 
    this.setOnClickListener(theCommonListener); 
    download(pub.thumbImageUrl); 
} 

public void download(String fileUrl){ 
    downloadTask t = new downloadTask(); 
    t.loadData(fileUrl, this); 
    t.execute(); 
} 

private class downloadTask extends AsyncTask<String, Void, Long> { 
    String fileUrl; 
    ShadowedImageView imView; 

    public void loadData(String u, ShadowedImageView i) { 
     fileUrl = u; 
     imView = i; 
    } 

    @Override 
    protected Long doInBackground(String... params) { 
     try{ 
      Bitmap bmImg = null; 
      URL myFileUrl = null; 
      try { 
       if(fileUrl!=null){ 
        myFileUrl= new URL(fileUrl); 
       } 
      } catch (MalformedURLException e) { 
       e.printStackTrace(); 
      } 
      try { 
       if(myFileUrl!=null){ 
        HttpURLConnection conn=(HttpURLConnection)myFileUrl.openConnection(); 
        conn.setDoInput(true); 
        conn.connect(); 
        InputStream is = conn.getInputStream(); 
        decodeStream(is); 
       } 
      } catch (Exception e) { 
       e.printStackTrace(); 
      } 
     } catch (Exception e) { 
      e.printStackTrace(); 
     } 
     return null; 
    } 

    @Override 
    protected void onPostExecute(Long result){ 
     setImageBitmap(bitmap); 
     invalidate(); 

    } 
} 

private void decodeStream(InputStream is){ 
    try { 
     BitmapFactory.Options o2 = new BitmapFactory.Options(); 
     o2.inSampleSize=scale; 
     bitmap = BitmapFactory.decodeStream(is, null, o2); 
     refreshShadow(); 
     loaded = 1; 
     invalidate(); 
    } catch (Exception e) { 
     e.printStackTrace(); 
    } 
} 
} 

とアダプタ：

public class AddImgAdp extends BaseAdapter { 
    int GalItemBg; 
    private Context cont; 

    private ShadowedImageView[] Imgid; 

    public AddImgAdp(Context c) { 
     Imgid = pagesArray; 
     cont = c; 
     TypedArray typArray = obtainStyledAttributes(R.styleable.GalleryTheme); 
     GalItemBg = typArray.getResourceId(R.styleable.GalleryTheme_android_galleryItemBackground, 0); 
     typArray.recycle(); 
    } 

    public int getCount() { 
     return pagesArray.length; 
    } 

    public Object getItem(int position) { 
     return pagesArray[position]; 
    } 

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

    public View getView(int position, View convertView, ViewGroup parent) { 
     ShadowedImageView imgView = pagesArray[position]; 
     pagesArray[position].scale = 1; 
     pagesArray[position].download(URL_TO_LOAD_IMAGE); 

     DisplayMetrics dm = new DisplayMetrics(); 

     imgView.setScaleType(ImageView.ScaleType.FIT_XY); 
     imgView.setBackgroundResource(GalItemBg); 
     return imgView; 
    } 
} 

画像が大きく、アプリはそれらの多くを読み込むとき、私はメモリから抜け出します。メモリからすべての不可視画像を削除したいとします：

   +-------------+ 
       | screen | 
[1] [2] [3] [4] | [5] [6] [7] | [8] [9] [10] 
       |    | 
       +-------------+ 

画像1-3と9-10は不要です - 私はメモリを解放したいです。どうやってするの？

Answer 1

私は、あなたが何をする必要があるか、同じ問題を持っていたギャラリーで使用するカスタムアダプタを作成するには、ビットマップにリサイクルするgetViewメソッドの機能を使用することです：

public View getView(int position, View convertView, ViewGroup parent) { 
     ImageView i = new ImageView(this.myContext); 
     Bitmap tempBitmap = null; 

     //Check if my PhotoList at this position is not null... 

     //Free previous photos 
     if ((position-3)>=0 && listBitmap.size()-3 >=0 && listBitmap(position-3) != null){ 
      //Here is to free for 1 photo, you can free more ... (3 in your case) 
      listBitmap(position-3).recycle(); 
      listBitmap(position-3).setBitmap(null); 
      Log.w(TAG, "Delete Photo-3"); 
     }