我已经阅读了许多关于这个主题的帖子,并尝试在我的代码中使用它们,但我仍然无法解决问题。
我正在尝试做的事情: 像Facebook或任何其他从服务器下载包括图像的供稿的应用程序一样,我也在尝试显示提要和图片在图像视图上。
现状: 我能够下载(JSON格式)包含图像URL的提要,并将其显示在ImageView上。 在模拟器中,我的最大堆大小为64MB。在前10条提要中,我消耗了约30MB的内存(不确定为什么,但这是我从Android Studio的Memory选项卡和即使在Android设备监视器中获得的结果)。 我在我的应用程序中有一个刷新按钮,可以删除之前填充的所有提要后重新加载相同的提要。我期望我将消耗相同的内存或更多一些。但与此相反,我的内存使用量增加到42MB。因此,如果我点击3到4次刷新按钮,就会导致OutOfMemory Exception。即使每次加载10条或50条提要,我都会遇到OutOfMemory Exception。
我知道Facebook、Instagram和许多类似的应用程序都在做同样的事情,但不确定他们如何实现代码来解决这个问题。
以下是填充提要的代码:
private void loadFeed(List<Feed> feedList)
{
Log.v(Constant.TAG,"Loading Feed in social feed page");
for(final Feed feed:feedList) {
LinearLayout feedBox = new LinearLayout(this);
feedBox.setOrientation(LinearLayout.VERTICAL);
FrameLayout profileDetailContainer= new FrameLayout(this);
LinearLayout profileDetailContainerParent=new LinearLayout(this);
LinearLayout profileDetailContainerChild=new LinearLayout(this);
profileDetailContainerChild.setOrientation(LinearLayout.VERTICAL);
ImageView imgProfile= new ImageView(this);
TextView txtDate= new TextView(this);
TextView txtName= new TextView(this);
ImageView imgProduct= new ImageView(this);
txtName.setText(feed.getUserFullName());
TextView txtDesciption= new TextView(this);
txtName.setTypeface(null, Typeface.BOLD);
if(feed.getDescription().length()>Constant.NUMBER_OF_DESCRIPTION_CHAR_SHOW_ON_RESULT)
{
txtDesciption.setText(feed.getDescription().substring(0,Constant.NUMBER_OF_DESCRIPTION_CHAR_SHOW_ON_RESULT)+"...");
}
else
txtDesciption.setText(feed.getDescription());
if(!IOUtil.fileExists(this,feed.getProductImageName())) {
WebRequest request = new WebRequest();
request.setUrl(Constant.ROOT_APPLICATION_URL_WITH_SEPARATOR + feed.getImgPath());
request.setParam(feed.getId() + "");
new ImageDownloadTask(this, true, feed.getProductImageName(), this).execute(request);
Log.v(Constant.TAG,"URL:"+Constant.ROOT_APPLICATION_URL_WITH_SEPARATOR+feed.getImgPath());
Picasso.with(getApplicationContext()).load(R.drawable.logo).into(imgProduct);
feedBox.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
ScreenUtility.alertException(v.getContext(),"Please wait untill product image loads");
}
});
PixyfiSession.save(feed.getId() + "", imgProduct);
PixyfiSession.save(feed.getId() + "_feed", feed);
}
else
{
ImageUtil.recycleIfPossible(imgProduct);
try {
imgProduct.setImageBitmap(ImageUtil.getLocalImage(feed.getProductImageName(),this));
FeedboxOnClickListener feedboxOnClickListener = new FeedboxOnClickListener(feed);
feedBox.setOnClickListener(feedboxOnClickListener);
} catch (FileNotFoundException e) {
Log.v(Constant.TAG,e.getMessage(),e);
}
}
if(FacebookUtil.localProfilePicExists(feed.getUserName(),this))
{
Bitmap profileImage= FacebookUtil.getLocalProfilePicture(feed.getUserName(),this);
imgProfile.setImageBitmap(profileImage);
}
else {
FacebookUtil.loadProfilePicture(feed.getUserName(),this,this);
PixyfiSession.save(feed.getUserName(),imgProfile);
imgProfile.setImageResource(R.drawable.profile);
}
try {
if(feed.getDate()==null) {
txtDate.setText(new SimpleDateFormat("dd MMM yyyy").format(new SimpleDateFormat("yyyy-MM-dd").parse(feed.getFeedDate())));
}
else {
txtDate.setText(new SimpleDateFormat("dd MMM yyyy").format(feed.getDate()));
}
} catch (ParseException e) {
Log.e(Constant.TAG,e.getMessage(),e);
}
LinearLayout.LayoutParams layoutParam= new LinearLayout.LayoutParams(140,140);
layoutParam.setMargins(5,5,0,0);
imgProfile.setLayoutParams(layoutParam);
layoutParam= new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT,LinearLayout.LayoutParams.WRAP_CONTENT,Gravity.TOP|Gravity.LEFT);
layoutParam.setMargins(20,5,0,0);
txtName.setLayoutParams(layoutParam);
layoutParam= new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT,LinearLayout.LayoutParams.WRAP_CONTENT,Gravity.LEFT);
layoutParam.setMargins(20,5,0,0);
txtDate.setLayoutParams(layoutParam);
profileDetailContainerParent.addView(imgProfile);
profileDetailContainerChild.addView(txtName);
profileDetailContainerChild.addView(txtDate);
profileDetailContainerParent.addView(profileDetailContainerChild);
feedBox.addView(profileDetailContainerParent);
LinearLayout.LayoutParams feedLayoutParam=new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,ViewGroup.LayoutParams.WRAP_CONTENT,Gravity.CENTER_VERTICAL);
feedLayoutParam.setMargins(5,5,5,5);
imgProduct.setLayoutParams(feedLayoutParam);
txtDesciption.setLayoutParams(feedLayoutParam);
feedBox.addView(txtDesciption);
feedBox.addView(imgProduct);
feedLayoutParam=new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,ViewGroup.LayoutParams.WRAP_CONTENT,Gravity.CENTER_VERTICAL);
feedLayoutParam.setMargins(0,5,0,5);
feedBox.setLayoutParams(feedLayoutParam);
feedBox.setBackgroundColor(Color.parseColor("#cccccc"));
PixyfiSession.save(feed.getId()+"_feedbox",feedBox);
imgProfile.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
PixyfiSession.save(Constant.SELECTED_USER_ID,feed.getUserName());
ScreenUtility.loadScreen(v.getContext(),UsersProfile.class,false);
}
});
this.feedContainer.addView(feedBox);
}
if(feedList.size()==Constant.FEED_SIZE_IN_ONE_REQUEST)
{
Button moreFeed= new Button(this);
moreFeed.setText("Load MOre Feed");
moreFeed.setOnClickListener(new MoreFeedButtonListener(this));
this.feedContainer.addView(moreFeed);
}
this.progressBar.setVisibility(View.INVISIBLE);
}
重新加载/刷新信息流
this.currentPage=1;
this.recycleImages();
this.feedContainer.removeAllViews();
PixyfiSession.save(Constant.CURRENT_FEED_PAGE,this.currentPage);
this.progressBar.setVisibility(View.VISIBLE);
loadFeed();
recycleImages方法:
private void recycleImages()
{
for(int i=0;i<this.feedContainer.getChildCount();i++)
{
if(this.feedContainer.getChildAt(i) instanceof ImageView)
{
ImageView view=(ImageView)this.feedContainer.getChildAt(i);
ImageUtil.recycleIfPossible(view);
}
}
}
如果您需要代码的更多细节,请告诉我。 另外,在Android设备监视器中是否可以查看其他应用程序(例如Facebook)的内存使用情况? 更新 ImageUtil.getLocalImage方法
public static Bitmap getLocalImage(String imageName, Context context) throws FileNotFoundException
{
Bitmap bitmap=null;
InputStream is=null;
if(IOUtil.fileExists(context,imageName)) {
is = context.openFileInput(imageName);
bitmap= BitmapFactory.decodeStream(is);
}
else {
throw new FileNotFoundException("Image file doesn't exists");
}
return bitmap;
}