android上的一個網絡接口和圖片緩存框架enif簡析

2020-04-11 12:38:04

字體：大中小

來源：轉載

供稿：網友

1.底層網絡接口采用apache的httpclient連接池框架；
2.圖片緩存采用基于LRU的算法；
3.網絡接口采用監聽者模式；
4.包含圖片的OOM處理（及時回收處理技術的應用）；

圖片核心處理類：CacheView.java

復制代碼代碼如下:

 
package xiaogang.enif.image; 
import java.io.FilterInputStream; 
import java.io.IOException; 
import java.io.InputStream; 
import java.lang.ref.SoftReference; 
import java.util.HashMap; 
import java.util.concurrent.RejectedExecutionException; 
import org.apache.http.HttpEntity; 
import org.apache.http.HttpResponse; 
import org.apache.http.HttpStatus; 
import org.apache.http.client.methods.HttpGet; 
import xiaogang.enif.utils.HttpManager; 
import xiaogang.enif.utils.IOUtils; 
import xiaogang.enif.utils.LogUtils; 
import xiaogang.enif.utils.LruCache; 
import android.app.ActivityManager; 
import android.content.Context; 
import android.graphics.Bitmap; 
import android.graphics.BitmapFactory; 
import android.graphics.BitmapFactory.Options; 
import android.graphics.Canvas; 
import android.graphics.drawable.BitmapDrawable; 
import android.os.AsyncTask; 
import android.text.TextUtils; 
import android.util.AttributeSet; 
import android.widget.ImageView; 
public class CacheView extends ImageView { 
private static final int DEFAULT_RES_ID = 0; 
private int mDefaultImage = DEFAULT_RES_ID; 
private static LruCache<String, Bitmap> mLruCache; 
private static HashMap<Integer, SoftReference<Bitmap>> mResImage; 
private Context mContext; 
private LogUtils mLog = LogUtils.getLog(CacheView.class); 
public CacheView(Context context, AttributeSet attrs, int defStyle) { 
super(context, attrs, defStyle); 
init(context); 
} 
public CacheView(Context context, AttributeSet attrs) { 
super(context, attrs); 
init(context); 
} 
public CacheView(Context context) { 
super(context); 
init(context); 
} 
private void init(Context context) { 
mContext = context; 
if (mLruCache == null) { 
final int cacheSize = getCacheSize(context); 
mLruCache = new LruCache<String, Bitmap>(cacheSize) { 
@Override 
protected int sizeOf(String key, Bitmap bitmap) { 
// The cache size will be measured in bytes rather than 
// number of items. 
return bitmap.getRowBytes() * bitmap.getHeight(); 
} 
@Override 
protected void entryRemoved(boolean evicted, String key, Bitmap oldValue, 
Bitmap newValue) { 
if (evicted && oldValue != null && !oldValue.isRecycled()) { 
oldValue.recycle(); 
oldValue = null; 
} 
} 
}; 
} 
if (mResImage == null) { 
mResImage = new HashMap<Integer, SoftReference<Bitmap>>(); 
} 
} 
@Override 
protected void onDraw(Canvas canvas) { 
BitmapDrawable drawable = (BitmapDrawable)getDrawable(); 
if (drawable == null) { 
setDefaultImage(); 
} else { 
if (drawable.getBitmap() == null || drawable.getBitmap().isRecycled()) { 
setDefaultImage(); 
} 
} 
try { 
super.onDraw(canvas); 
} catch(RuntimeException ex) { 
} 
} 
public void setImageUrl(String url, int resId) { 
setTag(url); 
Bitmap bitmap = getBitmapFromCache(url); 
if (bitmap == null || bitmap.isRecycled()) { 
mDefaultImage = resId; 
setDefaultImage(); 
try { 
new DownloadTask().execute(url); 
} catch (RejectedExecutionException e) { 
// do nothing, just keep not crash 
} 
} else { 
setImageBitmap(bitmap); 
} 
} 
private void setDefaultImage() { 
if (mDefaultImage != DEFAULT_RES_ID) { 
setImageBitmap(getDefaultBitmap(mContext)); 
} 
} 
private Bitmap getDefaultBitmap(Context context) { 
SoftReference<Bitmap> loading = mResImage.get(mDefaultImage); 
if (loading == null || loading.get() == null || loading.get().isRecycled()) { 
loading = new SoftReference<Bitmap>(BitmapFactory.decodeResource( 
context.getResources(), mDefaultImage)); 
mResImage.put(mDefaultImage, loading); 
} 
return loading.get(); 
} 
private class DownloadTask extends AsyncTask<String, Void, Bitmap> { 
private String mParams; 
@Override 
public Bitmap doInBackground(String... params) { 
mParams = params[0]; 
final Bitmap bm = download(mParams); 
addBitmapToCache(mParams, bm); 
return bm; 
} 
@Override 
public void onPostExecute(Bitmap bitmap) { 
String tag = (String)getTag(); 
if (!TextUtils.isEmpty(tag) && tag.equals(mParams)) { 
if (bitmap != null) { 
setImageBitmap(bitmap); 
} 
} 
} 
}; 
/* 
* An InputStream that skips the exact number of bytes provided, unless it 
* reaches EOF. 
*/ 
static class FlushedInputStream extends FilterInputStream { 
public FlushedInputStream(InputStream inputStream) { 
super(inputStream); 
} 
@Override 
public long skip(long n) throws IOException { 
long totalBytesSkipped = 0L; 
while (totalBytesSkipped < n) { 
long bytesSkipped = in.skip(n - totalBytesSkipped); 
if (bytesSkipped == 0L) { 
int b = read(); 
if (b < 0) { 
break; // we reached EOF 
} else { 
bytesSkipped = 1; // we read one byte 
} 
} 
totalBytesSkipped += bytesSkipped; 
} 
return totalBytesSkipped; 
} 
} 
private Bitmap download(String url) { 
InputStream in = null; 
HttpEntity entity = null; 
Bitmap bmp = null; 
try { 
final HttpGet get = new HttpGet(url); 
final HttpResponse response = HttpManager.execute(mContext, get); 
if (response.getStatusLine().getStatusCode() == HttpStatus.SC_OK) { 
entity = response.getEntity(); 
in = entity.getContent(); 
try { 
bmp = getDecodeBitmap(in, url); 
} catch (OutOfMemoryError err) { 
Runtime.getRuntime().gc(); 
bmp = getDecodeBitmap(in, url); 
} 
} else { 
get.abort(); 
return bmp; 
} 
addBitmapToCache(url, bmp); 
} catch (IOException e) { 
return bmp; 
} finally { 
IOUtils.closeStream(in); 
} 
return bmp; 
} 
private final Bitmap getDecodeBitmap(InputStream in, String url) { 
Options options = new Options(); 
options.inPurgeable = true; 
options.inInputShareable = true; 
return BitmapFactory.decodeStream(new FlushedInputStream(in), null, options); 
} 
private final void addBitmapToCache(String url, Bitmap bitmap) { 
if (bitmap != null) { 
mLruCache.put(url, bitmap); 
Runtime.getRuntime().gc(); 
} 
} 
private final Bitmap getBitmapFromCache(String url) { 
return mLruCache.get(url); 
} 
private int getCacheSize(Context context) { 
// According to the phone memory, set a proper cache size for LRU cache 
// dynamically. 
final ActivityManager am = (ActivityManager)context 
.getSystemService(Context.ACTIVITY_SERVICE); 
final int memClass = am.getMemoryClass(); 
int cacheSize; 
if (memClass <= 24) { 
cacheSize = (memClass << 20) / 24; 
} else if (memClass <= 36) { 
cacheSize = (memClass << 20) / 18; 
} else if (memClass <= 48) { 
cacheSize = (memClass << 20) / 12; 
} else { 
cacheSize = (memClass << 20) >> 3; 
} 
mLog.debug("cacheSize == "+cacheSize); 
System.out.println("cacheSize == "+cacheSize); 
return cacheSize; 
} 
public static void recycle() { 
if (mLruCache != null && !mLruCache.isEmpty()) { 
mLruCache.evictAll(); 
mLruCache = null; 
} 
if (mResImage != null) { 
for (SoftReference<Bitmap> reference : mResImage.values()) { 
Bitmap bitmap = reference.get(); 
if (bitmap != null && !bitmap.isRecycled()) { 
bitmap.recycle(); 
bitmap = null; 
} 
} 
mResImage = null; 
} 
} 
} 

說明：
1）entryRemoved在做bitmap recycle的時候的3個條件缺一不可；
2）onDraw里面判斷圖片是否被回收，如果回收，需要設置默認圖片；
3）add bitmap到cache的時候Runtime.getRuntime().gc();的調用；
4）getCacheSize可以根據手機具體的內存來動態設置我們實際需要的緩存大小；
5)退出時，記得調用recycle()方法；
網絡接口核心類：WSAPI.java, WSCfg.java, WSTask.java

復制代碼代碼如下:

 
<STRONG>package xiaogang.enif.net; 
import java.util.ArrayList; 
import org.apache.http.message.BasicNameValuePair; 
/** 
* web service configuration file 
* */ 
public class WSCfg { 
public static final int USER_LOGIN = 0;//action 
public static final int USER_LOGOUT = 1;//action 
public static ArrayList<BasicNameValuePair> sValuePairs;//common vps 
static { 
sValuePairs = new ArrayList<BasicNameValuePair>(); 
sValuePairs.add(new BasicNameValuePair("v", "1.0")); 
sValuePairs.add(new BasicNameValuePair("format", "json")); 
} 
}</STRONG> 

復制代碼代碼如下:

 
<STRONG>package xiaogang.enif.net; 
import java.util.ArrayList; 
import java.util.concurrent.RejectedExecutionException; 
import org.apache.http.message.BasicNameValuePair; 
import xiaogang.enif.net.WSTask.TaskListener; 
import android.content.Context; 
public class WSAPI { 
private WSAPI() { 
} 
public static void execute(Context context, TaskListener listener, int action, 
ArrayList<BasicNameValuePair> vp) { 
try { 
new WSTask(context, listener, action, vp).execute(); 
} catch (RejectedExecutionException e) { 
// do nothing, just keep not crashing. 
} 
} 
} 
</STRONG> 

復制代碼代碼如下:

 
<STRONG>package xiaogang.enif.net; 
import java.io.IOException; 
import java.io.InputStream; 
import java.util.ArrayList; 
import java.util.HashMap; 
import java.util.Iterator; 
import org.apache.http.HttpEntity; 
import org.apache.http.HttpResponse; 
import org.apache.http.HttpStatus; 
import org.apache.http.client.entity.UrlEncodedFormEntity; 
import org.apache.http.client.methods.HttpPost; 
import org.apache.http.message.BasicNameValuePair; 
import org.json.JSONArray; 
import org.json.JSONException; 
import org.json.JSONObject; 
import xiaogang.enif.utils.HttpManager; 
import xiaogang.enif.utils.IOUtils; 
import xiaogang.enif.utils.LogUtils; 
import android.app.Activity; 
import android.content.Context; 
import android.os.AsyncTask; 
import android.text.TextUtils; 
public class WSTask extends AsyncTask<Void, Void, Object> { 
private int mAction; 
private String mErrorCode; 
private Object mParameter; 
private Context mContext; 
private TaskListener mTaskListener; 
private Exception mReason; 
private final LogUtils mLog = LogUtils.getLog(WSTask.class); 
public WSTask(Context context, TaskListener listener, int action, Object paramObject) { 
mContext = context; 
mTaskListener = listener; 
mParameter = paramObject; 
mAction = action; 
} 
@Override 
public Object doInBackground(Void... arg0) { 
Object result = null; 
try { 
@SuppressWarnings("unchecked") 
ArrayList<BasicNameValuePair> vps = (ArrayList<BasicNameValuePair>)mParameter; 
final String jsonString = request(mContext, "your url", vps); 
mLog.debug(jsonString); 
result = parseJson(jsonString); 
if (result != null && result instanceof String 
&& TextUtils.isDigitsOnly((String)result)) { 
mErrorCode = (String)result; 
return null; 
} 
} catch (Exception e) { 
mReason = e; 
mLog.error(e.getMessage()); 
return null; 
} 
return result; 
} 
@Override 
public void onPostExecute(Object result) { 
if (mContext== null) { 
clearTask(); 
return; 
} 
if (mContext instanceof Activity && ((Activity) mContext).isFinishing()) { 
clearTask(); 
return; 
} 
if (result == null || mReason != null) { 
mTaskListener.onFailed(mAction, mErrorCode, mReason); 
} else { 
mTaskListener.onSuccess(mAction, result); 
} 
clearTask(); 
} 
private String request(Context context, String url, ArrayList<BasicNameValuePair> vp) 
throws IOException { 
final HttpPost post = new HttpPost(url); 
post.setEntity(new UrlEncodedFormEntity(vp, "UTF_8")); 
InputStream in = null; 
HttpEntity entity = null; 
try { 
final HttpResponse response = HttpManager.execute(context, post); 
final int statusCode = response.getStatusLine().getStatusCode(); 
if (statusCode == HttpStatus.SC_OK) { 
entity = response.getEntity(); 
if (entity != null) { 
in = entity.getContent(); 
return IOUtils.stream2String(in); 
} 
} else { 
post.abort(); 
mLog.error("http code: " + response.getStatusLine().getStatusCode()); 
} 
return null; 
} catch (IOException ex) { 
post.abort(); 
throw ex; 
} catch (RuntimeException ex) { 
post.abort(); 
throw ex; 
} finally { 
if(entity!=null) { 
entity.consumeContent(); 
} 
IOUtils.closeStream(in); 
} 
} 
private Object parseJson(String jsonString) throws IOException { 
try { 
JSONObject jobj = new JSONObject(jsonString); 
if (jobj.has("errorcode")) { 
return jobj.optString("errorcode"); 
} 
if (jobj.has("resultlist")) { 
ArrayList<HashMap<String, String>> arrList; 
arrList = new ArrayList<HashMap<String, String>>(); 
JSONArray jsonArray = jobj.optJSONArray("resultlist"); 
final int len = jsonArray.length(); 
for (int i = 0; i < len; i++) { 
final JSONObject obj = (JSONObject)jsonArray.opt(i); 
arrList.add(parse2Map(obj)); 
} 
return arrList; 
} else { 
return parse2Map(jobj); 
} 
} catch (JSONException e) { 
IOException ioe = new IOException("Invalid json String..."); 
ioe.initCause(e); 
throw ioe; 
} 
} 
private HashMap<String, String> parse2Map(JSONObject jsonObj) throws IOException { 
final HashMap<String, String> hashMap = new HashMap<String, String>(); 
@SuppressWarnings("unchecked") 
final Iterator<String> keyIter = jsonObj.keys(); 
String key, value; 
while (keyIter != null && keyIter.hasNext()) { 
key = keyIter.next(); 
value = jsonObj.optString(key); 
hashMap.put(key, value); 
} 
return hashMap; 
} 
private void clearTask() { 
mTaskListener = null; 
mParameter = null; 
mContext = null; 
} 
public interface TaskListener { 
public void onSuccess(int action, Object result); 
public void onFailed(int action, String errcode, Exception ex); 
} 
} 
</STRONG> 

說明：
1）根據你的服務器接口實際情況，去修改parseJson方法；
2）WSCfg里面可以定義接口的action；
sample：

復制代碼代碼如下:

 
package xiaogang.enif.ui; 
import java.util.ArrayList; 
import org.apache.http.message.BasicNameValuePair; 
import xiaogang.enif.R; 
import xiaogang.enif.image.CacheView; 
import xiaogang.enif.net.WSAPI; 
import xiaogang.enif.net.WSCfg; 
import xiaogang.enif.net.WSTask.TaskListener; 
import xiaogang.enif.widget.ListsApdater; 
import android.app.Activity; 
import android.os.Bundle; 
import android.widget.ListView; 
public class MainActivity extends Activity implements TaskListener { 
ListView mList; 
ListsApdater mAdapter; 
@Override 
public void onCreate(Bundle savedInstanceState) { 
super.onCreate(savedInstanceState); 
setContentView(R.layout.main); 
setupViews(); 
} 
private void setupViews() { 
mList = (ListView)findViewById(R.id.list); 
mAdapter = new ListsApdater(this, mUrls); 
mList.setAdapter(mAdapter); 
final ArrayList<BasicNameValuePair> vp = new ArrayList<BasicNameValuePair>(); 
vp.addAll(WSCfg.sValuePairs); 
vp.add(new BasicNameValuePair("imei", "123")); 
vp.add(new BasicNameValuePair("imsi", "123")); 
WSAPI.execute(this, this, WSCfg.USER_LOGIN, vp); 
} 
@Override 
protected void onDestroy() { 
super.onDestroy(); 
mAdapter.recycle(); 
CacheView.recycle(); 
} 
private String[] mUrls = { 
"http://a3.twimg.com/profile_images/670625317/aam-logo-v3-twitter.png", 
"http://a3.twimg.com/profile_images/740897825/AndroidCast-350_normal.png", 
"http://a3.twimg.com/profile_images/121630227/Droid_normal.jpg", 
"http://a1.twimg.com/profile_images/957149154/twitterhalf_normal.jpg", 
"http://a1.twimg.com/profile_images/97470808/icon_normal.png", 
"http://a3.twimg.com/profile_images/511790713/AG.png", 
"http://a3.twimg.com/profile_images/956404323/androinica-avatar_normal.png", 
"http://a1.twimg.com/profile_images/909231146/Android_Biz_Man_normal.png", 
"http://a3.twimg.com/profile_images/72774055/AndroidHomme-LOGO_normal.jpg", 
"http://a1.twimg.com/profile_images/349012784/android_logo_small_normal.jpg", 
"http://a1.twimg.com/profile_images/841338368/ea-twitter-icon.png", 
"http://a3.twimg.com/profile_images/64827025/android-wallpaper6_2560x160_normal.png", 
"http://a3.twimg.com/profile_images/77641093/AndroidPlanet_normal.png", 
"http://a1.twimg.com/profile_images/850960042/elandroidelibre-logo_300x300_normal.jpg", 
"http://a1.twimg.com/profile_images/655119538/andbook.png", 
"http://a3.twimg.com/profile_images/768060227/ap4u_normal.jpg", 
"http://a1.twimg.com/profile_images/74724754/android_logo_normal.png", 
"http://a3.twimg.com/profile_images/681537837/SmallAvatarx150_normal.png", 
"http://a1.twimg.com/profile_images/63737974/2008-11-06_1637_normal.png", 
"http://a3.twimg.com/profile_images/548410609/icon_8_73.png", 
"http://a1.twimg.com/profile_images/612232882/nexusoneavatar_normal.jpg", 
"http://a1.twimg.com/profile_images/213722080/Bugdroid-phone_normal.png", 
"http://a1.twimg.com/profile_images/645523828/OT_icon_090918_android_normal.png", 
"http://a3.twimg.com/profile_images/64827025/android-wallpaper6_2560x160_normal.png", 
"http://a3.twimg.com/profile_images/77641093/AndroidPlanet.png", 
"http://a1.twimg.com/profile_images/850960042/elandroidelibre-logo_300x300_normal.jpg", 
"http://a1.twimg.com/profile_images/655119538/andbook_normal.png", 
"http://a3.twimg.com/profile_images/511790713/AG_normal.png", 
"http://a3.twimg.com/profile_images/956404323/androinica-avatar.png", 
"http://a1.twimg.com/profile_images/909231146/Android_Biz_Man_normal.png", 
"http://a3.twimg.com/profile_images/72774055/AndroidHomme-LOGO_normal.jpg", 
"http://a1.twimg.com/profile_images/349012784/android_logo_small_normal.jpg", 
"http://a1.twimg.com/profile_images/841338368/ea-twitter-icon_normal.png", 
"http://a3.twimg.com/profile_images/64827025/android-wallpaper6_2560x160_normal.png", 
"http://a3.twimg.com/profile_images/77641093/AndroidPlanet.png", 
"http://a3.twimg.com/profile_images/64827025/android-wallpaper6_2560x160_normal.png", 
"http://a1.twimg.com/profile_images/850960042/elandroidelibre-logo_300x300.jpg", 
"http://a1.twimg.com/profile_images/655119538/andbook_normal.png", 
"http://a3.twimg.com/profile_images/511790713/AG_normal.png", 
"http://a3.twimg.com/profile_images/956404323/androinica-avatar_normal.png", 
"http://a1.twimg.com/profile_images/909231146/Android_Biz_Man_normal.png", 
"http://a3.twimg.com/profile_images/121630227/Droid.jpg", 
"http://a1.twimg.com/profile_images/97470808/icon_normal.png", 
"http://a3.twimg.com/profile_images/511790713/AG_normal.png", 
"http://a3.twimg.com/profile_images/956404323/androinica-avatar_normal.png", 
"http://a1.twimg.com/profile_images/909231146/Android_Biz_Man.png", 
"http://a3.twimg.com/profile_images/72774055/AndroidHomme-LOGO_normal.jpg", 
"http://a1.twimg.com/profile_images/349012784/android_logo_small_normal.jpg", 
"http://a1.twimg.com/profile_images/841338368/ea-twitter-icon_normal.png", 
"http://a3.twimg.com/profile_images/64827025/android-wallpaper6_2560x160_normal.png", 
"http://a3.twimg.com/profile_images/77641093/AndroidPlanet.png", 
"http://a3.twimg.com/profile_images/121630227/Droid_normal.jpg", 
"http://a1.twimg.com/profile_images/957149154/twitterhalf_normal.jpg", 
"http://a1.twimg.com/profile_images/97470808/icon.png", 
"http://a3.twimg.com/profile_images/511790713/AG_normal.png", 
"http://a1.twimg.com/profile_images/909231146/Android_Biz_Man_normal.png", 
"http://a3.twimg.com/profile_images/72774055/AndroidHomme-LOGO_normal.jpg", 
"http://a1.twimg.com/profile_images/349012784/android_logo_small_normal.jpg", 
"http://a1.twimg.com/profile_images/841338368/ea-twitter-icon.png", 
"http://a3.twimg.com/profile_images/64827025/android-wallpaper6_2560x160_normal.png", 
"http://a3.twimg.com/profile_images/77641093/AndroidPlanet_normal.png", 
"http://a1.twimg.com/profile_images/850960042/elandroidelibre-logo_300x300_normal.jpg", 
"http://a1.twimg.com/profile_images/655119538/andbook_normal.png", 
"http://a3.twimg.com/profile_images/768060227/ap4u_normal.jpg", 
"http://a1.twimg.com/profile_images/74724754/android_logo.png", 
"http://a3.twimg.com/profile_images/681537837/SmallAvatarx150_normal.png", 
"http://a1.twimg.com/profile_images/63737974/2008-11-06_1637_normal.png", 
"http://a3.twimg.com/profile_images/548410609/icon_8_73_normal.png", 
"http://a1.twimg.com/profile_images/612232882/nexusoneavatar_normal.jpg", 
"http://a1.twimg.com/profile_images/213722080/Bugdroid-phone_normal.png", 
"http://a1.twimg.com/profile_images/645523828/OT_icon_090918_android.png", 
"http://a3.twimg.com/profile_images/64827025/android-wallpaper6_2560x160_normal.png", 
"http://a3.twimg.com/profile_images/77641093/AndroidPlanet_normal.png", 
"http://a1.twimg.com/profile_images/850960042/elandroidelibre-logo_300x300_normal.jpg", 
"http://a1.twimg.com/profile_images/655119538/andbook.png", 
"http://a3.twimg.com/profile_images/956404323/androinica-avatar_normal.png", 
"http://a1.twimg.com/profile_images/909231146/Android_Biz_Man_normal.png", 
"http://a3.twimg.com/profile_images/72774055/AndroidHomme-LOGO_normal.jpg", 
"http://a1.twimg.com/profile_images/349012784/android_logo_small_normal.jpg", 
"http://a1.twimg.com/profile_images/841338368/ea-twitter-icon.png", 
"http://a3.twimg.com/profile_images/64827025/android-wallpaper6_2560x160_normal.png", 
"http://a3.twimg.com/profile_images/77641093/AndroidPlanet_normal.png", 
"http://a3.twimg.com/profile_images/64827025/android-wallpaper6_2560x160_normal.png", 
"http://a1.twimg.com/profile_images/850960042/elandroidelibre-logo_300x300_normal.jpg", 
"http://a1.twimg.com/profile_images/655119538/andbook_normal.png", 
"http://a3.twimg.com/profile_images/511790713/AG_normal.png", 
"http://a3.twimg.com/profile_images/956404323/androinica-avatar_normal.png", 
"http://a1.twimg.com/profile_images/909231146/Android_Biz_Man_normal.png", 
"http://a3.twimg.com/profile_images/121630227/Droid_normal.jpg", 
"http://a1.twimg.com/profile_images/957149154/twitterhalf.jpg", 
"http://a1.twimg.com/profile_images/97470808/icon_normal.png", 
"http://a3.twimg.com/profile_images/511790713/AG_normal.png", 
"http://a1.twimg.com/profile_images/909231146/Android_Biz_Man_normal.png", 
"http://a3.twimg.com/profile_images/72774055/AndroidHomme-LOGO_normal.jpg", 
"http://a1.twimg.com/profile_images/841338368/ea-twitter-icon_normal.png", 
"http://a3.twimg.com/profile_images/64827025/android-wallpaper6_2560x160_normal.png", 
"http://a3.twimg.com/profile_images/77641093/AndroidPlanet_normal.png" 
}; 
@Override 
public void onSuccess(int action, Object result) { 
switch (action) { 
case WSCfg.USER_LOGIN: 
break; 
case WSCfg.USER_LOGOUT: 
break; 
} 
} 
@Override 
public void onFailed(int action, String errcode, Exception ex) { 
switch (action) { 
case WSCfg.USER_LOGIN: 
break; 
case WSCfg.USER_LOGOUT: 
break; 
} 
} 
} 

復制代碼代碼如下:

 
package xiaogang.enif.widget; 
import xiaogang.enif.R; 
import xiaogang.enif.image.CacheView; 
import android.content.Context; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.BaseAdapter; 
import android.widget.TextView; 
public class ListsApdater extends BaseAdapter { 
private String[] mUrls; 
private LayoutInflater mInflater; 
public ListsApdater(Context context, String[] urls) { 
mUrls = urls; 
mInflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
} 
@Override 
public int getCount() { 
return mUrls.length; 
} 
@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) { 
ViewHolder holder = null; 
if (null == convertView) { 
holder = new ViewHolder(); 
convertView = mInflater.inflate(R.layout.item, null); 
holder.view = (CacheView)convertView.findViewById(R.id.image); 
holder.text = (TextView)convertView.findViewById(R.id.text); 
convertView.setTag(holder); 
} else { 
holder = (ViewHolder)convertView.getTag(); 
} 
holder.text.setText("item "+position); 
holder.view.setImageUrl(mUrls[position], R.drawable.stub); 
return convertView; 
} 
public void recycle() { 
mUrls = null; 
mInflater = null; 
} 
private class ViewHolder { 
CacheView view; 
TextView text; 
} 
} 

main.xml和item.xml

復制代碼代碼如下:

 
<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
android:layout_width="fill_parent" 
android:layout_height="fill_parent" 
android:orientation="vertical" > 
<ListView 
android:id="@+id/list" 
android:layout_width="fill_parent" 
android:layout_height="0dip" 
android:layout_weight="1" /> 
</LinearLayout> 

復制代碼代碼如下:

 
<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
android:layout_width="fill_parent" 
android:layout_height="wrap_content" > 
<xiaogang.enif.image.CacheView 
android:id="@+id/image" 
android:layout_width="50dip" 
android:layout_height="50dip" 
android:scaleType="centerCrop" 
android:src="@drawable/stub" /> 
<TextView 
android:id="@+id/text" 
android:layout_width="0dip" 
android:layout_height="wrap_content" 
android:layout_gravity="left|center_vertical" 
android:layout_marginLeft="10dip" 
android:layout_weight="1" 
android:textSize="20dip" /> 
</LinearLayout> 