Android 在ListView中使用LazyList时出现内存不足错误
可能重复:Android 在ListView中使用LazyList时出现内存不足错误,android,android-listview,lazy-loading,android-adapter,lazylist,Android,Android Listview,Lazy Loading,Android Adapter,Lazylist,可能重复: 我一直在遵循关于在列表视图中延迟加载图像的教程,并且比我实现的要慢。代码按照我的要求正常工作,但在某些阶段会出现内存不足错误。我正在使用与ImageLoader、内存缓存、LazyAdapter、FileChache和UTIL相同的代码。 这是LazyAdapter类 public class LazyAdapter extends BaseAdapter { private Activity activity; private ArrayList<Stri
我一直在遵循关于在列表视图中延迟加载图像的教程,并且比我实现的要慢。代码按照我的要求正常工作,但在某些阶段会出现内存不足错误。我正在使用与ImageLoader、内存缓存、LazyAdapter、FileChache和UTIL相同的代码。 这是LazyAdapter类
public class LazyAdapter extends BaseAdapter {
private Activity activity;
private ArrayList<String> movieThumbnail;
private ArrayList<String> movieText;
private static LayoutInflater inflater=null;
public ImageLoader imageLoader;
public LazyAdapter(Activity a, ArrayList<String> movieThumbnail, ArrayList<String> movieText) {
activity = a;
/*data=d;*/
this.movieThumbnail = movieThumbnail;
this.movieText = movieText;
inflater = (LayoutInflater)activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
imageLoader=new ImageLoader(activity.getApplicationContext());
}
public int getCount() {
return movieText.size();
}
public Object getItem(int position) {
return position;
}
public long getItemId(int position) {
return position;
}
public View getView(int position, View convertView, ViewGroup parent) {
View vi=convertView;
if(convertView==null)
vi = inflater.inflate(R.layout.listrow, null);
TextView text=(TextView)vi.findViewById(R.id.rowListTextView);
ImageView image=(ImageView)vi.findViewById(R.id.movieImage);
text.setText(movieText.get(position));
imageLoader.DisplayImage(movieThumbnail.get(position), image);
return vi;
}
}
公共类LazyAdapter扩展了BaseAdapter{
私人活动;
私家侦探片;
私人编剧电影文本;
专用静态充气机=空;
公共图像加载器;
公共懒散适配器(活动a,ArrayList MovietHumbail,ArrayList MovietText){
活动=a;
/*数据=d*/
this.movieThumbnail=movieThumbnail;
this.movieText=movieText;
充气器=(LayoutInflater)activity.getSystemService(Context.LAYOUT\u充气器\u SERVICE);
imageLoader=新的imageLoader(activity.getApplicationContext());
}
public int getCount(){
返回movieText.size();
}
公共对象getItem(int位置){
返回位置;
}
公共长getItemId(int位置){
返回位置;
}
公共视图getView(int位置、视图转换视图、视图组父视图){
视图vi=转换视图;
if(convertView==null)
vi=充气机充气(R.layout.listrow,空);
TextView text=(TextView)vi.findViewById(R.id.rowListTextView);
ImageView image=(ImageView)vi.findViewById(R.id.movieImage);
text.setText(movieText.get(position));
imageLoader.DisplayImage(movieThumbnail.get(位置)、image);
返回vi;
}
}
记忆卡
public class MemoryCache {
private static final String TAG = "MemoryCache";
private Map<String, Bitmap> cache=Collections.synchronizedMap(
new LinkedHashMap<String, Bitmap>(10,1.5f,true));//Last argument true for LRU ordering
private long size=0;//current allocated size
private long limit=1000000;//max memory in bytes
public MemoryCache(){
//use 25% of available heap size
setLimit(Runtime.getRuntime().maxMemory()/6);
}
public void setLimit(long new_limit){
limit=new_limit;
Log.i(TAG, "MemoryCache will use up to "+limit/1024./1024.+"MB");
}
public Bitmap get(String id){
try{
if(!cache.containsKey(id))
return null;
//NullPointerException sometimes happen here http://code.google.com/p/osmdroid/issues/detail?id=78
return cache.get(id);
}catch(NullPointerException ex){
ex.printStackTrace();
return null;
}
}
public void put(String id, Bitmap bitmap){
try{
if(cache.containsKey(id))
size-=getSizeInBytes(cache.get(id));
cache.put(id, bitmap);
size+=getSizeInBytes(bitmap);
checkSize();
}catch(Throwable th){
th.printStackTrace();
}
}
private void checkSize() {
Log.i(TAG, "cache size="+size+" length="+cache.size());
if(size>limit){
Iterator<Entry<String, Bitmap>> iter=cache.entrySet().iterator();//least recently accessed item will be the first one iterated
while(iter.hasNext()){
Entry<String, Bitmap> entry=iter.next();
size-=getSizeInBytes(entry.getValue());
iter.remove();
if(size<=limit)
break;
}
Log.i(TAG, "Clean cache. New size "+cache.size());
}
}
public void clear() {
try{
//NullPointerException sometimes happen here http://code.google.com/p/osmdroid/issues/detail?id=78
cache.clear();
size=0;
}catch(NullPointerException ex){
ex.printStackTrace();
}
}
long getSizeInBytes(Bitmap bitmap) {
if(bitmap==null)
return 0;
return bitmap.getRowBytes() * bitmap.getHeight();
}
}
公共类内存缓存{
私有静态最终字符串TAG=“MemoryCache”;
私有映射缓存=Collections.synchronizedMap(
新LinkedHashMap(10,1.5f,true));//LRU排序的最后一个参数true
私有长大小=0;//当前分配的大小
private long limit=1000000;//最大内存(字节)
公共内存缓存(){
//使用可用堆大小的25%
setLimit(Runtime.getRuntime().maxMemory()/6);
}
公共无效设置限制(长新限制){
限制=新的限制;
Log.i(标记“MemoryCache将使用最多”+限制/1024./1024.+“MB”);
}
公共位图获取(字符串id){
试一试{
如果(!cache.containsKey(id))
返回null;
//NullPointerException有时发生在这里http://code.google.com/p/osmdroid/issues/detail?id=78
返回cache.get(id);
}捕获(NullPointerException ex){
例如printStackTrace();
返回null;
}
}
公共void put(字符串id、位图){
试一试{
if(cache.containsKey(id))
size-=getSizeInBytes(cache.get(id));
cache.put(id,位图);
size+=getSizeInBytes(位图);
checkSize();
}捕获(可丢弃){
th.printStackTrace();
}
}
私有void checkSize(){
Log.i(标记“cache size=“+size+”length=“+cache.size());
如果(大小>限制){
迭代器iter=cache.entrySet().Iterator();//最近访问最少的项将是第一个迭代的项
while(iter.hasNext()){
Entry=iter.next();
size-=getSizeInBytes(entry.getValue());
iter.remove();
如果(size使用此方法加载图像,则在使用滚动而非强制关闭时不会产生问题
MainClassActivity:
ArrayList<NewsItems> news = new ArrayList<NewsItems>();
SetListView sta;
sta = new SetListView(MainActivity.this, news);
lv.setAdapter(sta);
for (NewsItems s : news) {
s.loadImage(sta);
}
public class SetListView extends BaseAdapter{
private LayoutInflater inflater = null;
Activity activity;
ArrayList<NewsItems> one;
public SetListView(Activity a,ArrayList<NewsItems> one)
{
this.activity = a;
inflater = (LayoutInflater) a.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
this.one = one;
}
@Override
public int getCount() {
return one.size();
}
@Override
public Object getItem(int position) {
return position;
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View vi = convertView;
if (convertView == null)
vi = inflater.inflate(R.layout.main1, null);
TextView tv1 = (TextView) vi.findViewById(R.id.textView1);
TextView tv2 = (TextView) vi.findViewById(R.id.textView2);
tv1.setText(one.get(position).get_title());
tv2.setText(one.get(position).get_pudDate());
// Bitmap bm = loadBitmap(one.get(position).get_image());
if(one.get(position).get_bm() != null)
((ImageView)vi.findViewById(R.id.imageView1)).setImageBitmap(one.get(position).get_bm());
else
((ImageView)vi.findViewById(R.id.imageView1)).setImageResource(R.drawable.ic_launcher);
return vi;
}
}
package com.dudhat.classes;
import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.net.URLConnection;
import com.dudhat.rssfeeds.SetListView;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.AsyncTask;
import android.util.Log;
public class NewsItems {
private SetListView sta;
String _title,_pudDate,_description,_image;
Bitmap _bm;
public Bitmap get_bm() {
return _bm;
}
public String get_image() {
return _image;
}
public String get_title() {
return _title;
}
public String get_pudDate() {
return _pudDate;
}
public String get_description() {
return _description;
}
public SetListView getAdapter() {
return sta;
}
public void setAdapter(SetListView sta) {
this.sta = sta;
}
public NewsItems(String _title,String _pubdate,String _description,String _image,Bitmap _bm)
{
this._description = _description;
this._pudDate = _pubdate;
this._title = _title;
this._image = _image;
this._bm = _bm;
}
public void loadImage(SetListView sta) {
this.sta = sta;
if (_image != null && !_image.equals("")) {
new ImageLoadTask().execute(_image);
}
}
private class ImageLoadTask extends AsyncTask<String, String, Bitmap> {
@Override
protected void onPreExecute() {
Log.i("ImageLoadTask", "Loading image...");
}
protected Bitmap doInBackground(String... param) {
Log.i("ImageLoadTask", "Attempting to load image URL: " + param[0]);
try {
Bitmap b = loadBitmap(param[0]);
return b;
} catch (Exception e) {
e.printStackTrace();
return null;
}
}
protected void onPostExecute(Bitmap ret) {
if (ret != null) {
_bm = ret;
if (sta != null) {
sta.notifyDataSetChanged();
}
} else {
}
}
}
public Bitmap loadBitmap(String url)
{
Bitmap bm = null;
InputStream is = null;
BufferedInputStream bis = null;
try
{
URLConnection conn = new URL(url).openConnection();
conn.connect();
is = conn.getInputStream();
bis = new BufferedInputStream(is, 8192);
bm = BitmapFactory.decodeStream(bis);
}
catch (Exception e)
{
e.printStackTrace();
}
finally {
if (bis != null)
{
try
{
bis.close();
}
catch (IOException e)
{
e.printStackTrace();
}
}
if (is != null)
{
try
{
is.close();
}
catch (IOException e)
{
e.printStackTrace();
}
}
}
return bm;
}
}
MainClassActivity:
ArrayList news=新的ArrayList();
SetListView sta;
sta=新的SetListView(MainActivity.this,news);
低压设置适配器(sta);
用于(新闻项目s:新闻){
s、 loadImage(sta);
}
公共类SetListView扩展了BaseAdapter{
专用充气机=空;
活动;
ArrayList 1;
公共SetListView(活动a,ArrayList one)
{
本活动=a;
充气器=(LayoutInflater)a.getSystemService(Context.LAYOUT\u充气器\u SERVICE);
这个1=1;
}
@凌驾
public int getCount(){
返回1.size();
}
@凌驾
公共对象getItem(int位置){
返回位置;
}
@凌驾
公共长getItemId(int位置){
返回位置;
}
@凌驾
公共视图getView(int位置、视图转换视图、视图组父视图){
视图vi=转换视图;
if(convertView==null)
vi=充气机。充气(R.layout.main1,空);
TextView tv1=(TextView)vi.findViewById(R.id.textView1);
TextView tv2=(TextView)vi.findViewById(R.id.textView2);
tv1.setText(one.get(position.get_title());
tv2.setText(one.get(position.get_pudDate());
//位图bm=loadBitmap(one.get(position.get_image());
if(one.get(position.get_bm()!=null)
((ImageView)vi.findViewById(R.id.imageView1)).setImageBitmap(one.get(position.get_bm());
其他的
((ImageView)vi.findViewById(R.id.imageView1)).setImageResource(R.drawable.ic_启动器);
返回vi;
}
}
包com.dudhat.classes;
导入java.io.BufferedInputStream;
导入java.io.IOException;
导入java.io.InputStream;
导入java.net.URL;
导入java.net.URLConnection;
导入com.dudhat.rssfeeds.SetListView;
导入android.graphics.Bitmap;
导入android.graphics.BitmapFactory;
导入android.os.AsyncTask;
导入android.util.Log;
公共类新闻项目{
私有集合列表vi
MainClassActivity:
ArrayList<NewsItems> news = new ArrayList<NewsItems>();
SetListView sta;
sta = new SetListView(MainActivity.this, news);
lv.setAdapter(sta);
for (NewsItems s : news) {
s.loadImage(sta);
}
public class SetListView extends BaseAdapter{
private LayoutInflater inflater = null;
Activity activity;
ArrayList<NewsItems> one;
public SetListView(Activity a,ArrayList<NewsItems> one)
{
this.activity = a;
inflater = (LayoutInflater) a.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
this.one = one;
}
@Override
public int getCount() {
return one.size();
}
@Override
public Object getItem(int position) {
return position;
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View vi = convertView;
if (convertView == null)
vi = inflater.inflate(R.layout.main1, null);
TextView tv1 = (TextView) vi.findViewById(R.id.textView1);
TextView tv2 = (TextView) vi.findViewById(R.id.textView2);
tv1.setText(one.get(position).get_title());
tv2.setText(one.get(position).get_pudDate());
// Bitmap bm = loadBitmap(one.get(position).get_image());
if(one.get(position).get_bm() != null)
((ImageView)vi.findViewById(R.id.imageView1)).setImageBitmap(one.get(position).get_bm());
else
((ImageView)vi.findViewById(R.id.imageView1)).setImageResource(R.drawable.ic_launcher);
return vi;
}
}
package com.dudhat.classes;
import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.net.URLConnection;
import com.dudhat.rssfeeds.SetListView;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.AsyncTask;
import android.util.Log;
public class NewsItems {
private SetListView sta;
String _title,_pudDate,_description,_image;
Bitmap _bm;
public Bitmap get_bm() {
return _bm;
}
public String get_image() {
return _image;
}
public String get_title() {
return _title;
}
public String get_pudDate() {
return _pudDate;
}
public String get_description() {
return _description;
}
public SetListView getAdapter() {
return sta;
}
public void setAdapter(SetListView sta) {
this.sta = sta;
}
public NewsItems(String _title,String _pubdate,String _description,String _image,Bitmap _bm)
{
this._description = _description;
this._pudDate = _pubdate;
this._title = _title;
this._image = _image;
this._bm = _bm;
}
public void loadImage(SetListView sta) {
this.sta = sta;
if (_image != null && !_image.equals("")) {
new ImageLoadTask().execute(_image);
}
}
private class ImageLoadTask extends AsyncTask<String, String, Bitmap> {
@Override
protected void onPreExecute() {
Log.i("ImageLoadTask", "Loading image...");
}
protected Bitmap doInBackground(String... param) {
Log.i("ImageLoadTask", "Attempting to load image URL: " + param[0]);
try {
Bitmap b = loadBitmap(param[0]);
return b;
} catch (Exception e) {
e.printStackTrace();
return null;
}
}
protected void onPostExecute(Bitmap ret) {
if (ret != null) {
_bm = ret;
if (sta != null) {
sta.notifyDataSetChanged();
}
} else {
}
}
}
public Bitmap loadBitmap(String url)
{
Bitmap bm = null;
InputStream is = null;
BufferedInputStream bis = null;
try
{
URLConnection conn = new URL(url).openConnection();
conn.connect();
is = conn.getInputStream();
bis = new BufferedInputStream(is, 8192);
bm = BitmapFactory.decodeStream(bis);
}
catch (Exception e)
{
e.printStackTrace();
}
finally {
if (bis != null)
{
try
{
bis.close();
}
catch (IOException e)
{
e.printStackTrace();
}
}
if (is != null)
{
try
{
is.close();
}
catch (IOException e)
{
e.printStackTrace();
}
}
}
return bm;
}
}