Question

我正在使用一个应用程序并且有大约10个回收视图，当我在片段之间移动时，应用程序崩溃并且内存不足。
我在这个应用程序中使用了很多图像我想知道如何应用位图回收，因为它是异常的主要原因

我的回收适配器：

  public void onBindViewHolder(MboViewHolder holder, int position) {
    GameEvent gameEvent = ev.get(position);
    holder.bindPhoto(holder,cnt,gameEvent.getEventImage());}

BindPhoto mwthod ：

public void bindPhoto(MboViewHolder mbo,Context cnt, String photoUrl) {
         mbo.img.setTag(photoUrl);
        Bitmap imgz = Tools.getPhoto(photoUrl, 0);

    if (imgz != null) {
        mbo.img.setImageBitmap(imgz);
        Log.e("NoDwnLd","No");
    } else {
        Bitmap largeIcon = BitmapFactory.decodeResource(cnt.getResources(), R.drawable.ic_default);
        mbo.img.setImageBitmap(largeIcon);
        new DownloadBitmap(cnt,mbo.img,"2").execute(photoUrl);
    }

我的 DownloadBitmap asynctask ：

public class DownloadBitmap extends AsyncTask<String, Void, Bitmap> {

private  int flag=0;
private  ImageView img;
private  String type;
private HashMap<String, Bitmap> map= new HashMap<>();
private Context cnt;
private String url;

public DownloadBitmap(Context cnt, ImageView img, String type) {
    this.cnt = cnt;
    this.img=img;
    this.type=type;
}

public DownloadBitmap(Context cnt, ImageView img, String type, HashMap<String, Bitmap> map) {
    this.cnt = cnt;
    this.img=img;
    this.type=type;
    this.map=map;
}


public DownloadBitmap(Context context) {
    this.cnt=context;
    this.flag=2;
}


@Override
protected Bitmap doInBackground(String... params) {
    Bitmap bitmap=null;
    if (cnt!=null){
    boolean check = new CheckInternetConnection(cnt).haveNetworkConnection();
    if (check) {
        try {
            url=params[0];
            if (url==null || url.equals("")) return null;
        InputStream in = new java.net.URL(url).openStream();
            BitmapFactory.Options options = new BitmapFactory.Options();
            options.inSampleSize = Globals.inSampleSize;
            bitmap = BitmapFactory.decodeStream(in,null,options);
            return bitmap;
    } catch (Exception e) {
        Log.e("ImageDownload", "Download failed: " + e.getMessage());
    }
    }

    }
    return bitmap;
}

@Override
protected void onPostExecute(Bitmap bitmap) {
    if(bitmap != null){
        bitmap=Tools.resizeImage(bitmap,500,500);
    //view.setImageViewBitmap(R.id.nt_img, bitmap);
      if(type == "1")  Tools.sendNotification(cnt, bitmap);
      if(type == "2") {
          if(img.getTag()!= null && img.getTag() == url){
              // keep all images stored on memory for fast retrieval
            //  map.put(url, bitmap);
            //  Log.e("url", url);
              // save the image inside the image holder
              //img.setImageBitmap(map.get(url));
              Log.e("DwnLD",img.getTag()+"");
              img.setImageBitmap(bitmap);
              Tools.storePhoto(img.getTag().toString(), bitmap);
          }
     //   Log.e("ImageDownload", "bitmap in imageview");
      }
        if (type == null){
         //   map.put(url, bitmap);
           // if (img!=null && map.get(url)!=null)img.setImageBitmap(map.get(url));
            if (img!=null)img.setImageBitmap(bitmap);
        }

    if (cnt != null && flag ==2){
        Tools.storePhoto(CreateEvent1Fragment.searchResult.get(0).getEventImage(),bitmap);
    //    Log.e("ImageDownload", "bitmap in imageview");
    }
    }
}

我的 Tools.resizeImage ：

public static Bitmap resizeImage(Bitmap bitmap,int newWidth,int newHeight){
    Bitmap resized = Bitmap.createScaledBitmap(bitmap, newWidth, newHeight, true);
  return  resized;
}

我的 Tools.storePhoto 是：

public static void storePhoto(String url,Bitmap image){
File img = null;
File env = new File(Environment.getExternalStorageDirectory() + Globals.DIR);
if(!env.exists()) env.mkdir();
String filename = extractUrl(url);
    img=new File(Environment.getExternalStorageDirectory()+Globals.DIR+filename);
if (!img.exists()) {
   // Log.e("PHOTOS",img.getAbsolutePath());
    try {
        FileOutputStream fos = new FileOutputStream(img);
        image.compress(Bitmap.CompressFormat.PNG, 100, fos);
        fos.close();
    } catch (IOException e) {
        e.printStackTrace();
     }
}

我的 Tools.getPhoto 是：

    public static Bitmap getPhoto(String url,int type){
    Bitmap bmp=null;
    String filename = extractUrl(url);
    File ff = new File(Environment.getExternalStorageDirectory()+Globals.DIR+filename);
    if(!ff.exists()){
        return bmp;
    }else {
       if (type != 1){
           bmp = Tools.decodeFile(ff);
           return bmp;
       }else {
           bmp = BitmapFactory.decodeFile(ff.getAbsolutePath());
           return bmp;
       }
       }
}

我的 Tools.decodeFile 是：

        public static  Bitmap decodeFile(File f) {
    try {
        // Decode image size
        BitmapFactory.Options o = new BitmapFactory.Options();
        o.inJustDecodeBounds = true;
        BitmapFactory.decodeStream(new FileInputStream(f), null, o);

        // The new size we want to scale to
        final int REQUIRED_SIZE=70;

        // Find the correct scale value. It should be the power of 2.
        int scale = 1;
        while(o.outWidth / scale / 2 >= REQUIRED_SIZE &&
                o.outHeight / scale / 2 >= REQUIRED_SIZE) {
            scale *= 2;
        }

        o.inSampleSize = scale;
        o.inJustDecodeBounds = false;
        return BitmapFactory.decodeStream(new FileInputStream(f), null, o);
    } catch (FileNotFoundException e) {}
    return null;
}

我想应用位图回收...我该怎么做？

Answer 1

尝试使用Libs Glide

https://github.com/bumptech/glide

变化

if (imgz != null) {
     mbo.img.setImageBitmap(imgz);
    Log.e("NoDwnLd","No");
} else {
    Bitmap largeIcon = BitmapFactory.decodeResource(cnt.getResources(), R.drawable.ic_default);
    mbo.img.setImageBitmap(largeIcon);
    new DownloadBitmap(cnt,mbo.img,"2").execute(photoUrl);
}

到

  if(!photoUrl.isEmpty()) {
      Glide.with(this).load(photoUrl).error(R.drawable.ic_default).into(mbo.img);
    Log.e("NoDwnLd","No");
} else {
   Glide.with(this).load(R.drawable.ic_default).error(R.drawable.ic_default).into(mbo.img);
    new DownloadBitmap(cnt,mbo.img,"2").execute(photoUrl);
}

如何在recycleView中应用位图回收，因为内存不足异常

1 个答案: