- 所需要的權限:
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
- 初始化:
public class MyApplication extends Application {
@Override
public void onCreate() {
super.onCreate();
initImageLoader(getApplicationContext());
}
public static void initImageLoader(Context context) {
// 緩存檔案的目錄
File cacheDir = StorageUtils.getOwnCacheDirectory(context, "mycache");//sdcard目錄
ImageLoaderConfiguration config =
new ImageLoaderConfiguration.Builder(context).memoryCacheExtraOptions(, ) // max
// height,即儲存的每個緩存檔案的最大長寬
.threadPoolSize()
// 線程池内加載的數量
.threadPriority(Thread.NORM_PRIORITY - )
.denyCacheImageMultipleSizesInMemory()
//
.discCacheFileNameGenerator(new Md5FileNameGenerator())
// 将儲存的時候的URI名稱用MD5 加密
.memoryCache(new UsingFreqLimitedMemoryCache( * * ))
// You can pass your own memory cache
// implementation/你可以通過自己的記憶體緩存實作
.memoryCacheSize( * * )
// 記憶體緩存的最大值
.discCacheSize( * * )
// 50 Mb sd卡(本地)緩存的最大值
.tasksProcessingOrder(QueueProcessingType.LIFO)
// 由原先的discCache -> diskCache
.discCache(new UnlimitedDiscCache(cacheDir))
// 自定義緩存路徑
.imageDownloader(new BaseImageDownloader(context, * , * ))
// connectTimeout (5 s), readTimeout (30 s)逾時時間
.writeDebugLogs()
// Remove for release app
.build();
// 全局初始化此配置
ImageLoader.getInstance().init(config);
}
}
- MainActivity:
package com.example.imageloader;
import java.util.ArrayList;
import java.util.List;
import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.GridView;
import android.widget.ImageView;
import com.nostra13.universalimageloader.core.DisplayImageOptions;
import com.nostra13.universalimageloader.core.ImageLoader;
import com.nostra13.universalimageloader.core.assist.FailReason;
import com.nostra13.universalimageloader.core.assist.ImageLoadingListener;
import com.nostra13.universalimageloader.core.assist.ImageLoadingProgressListener;
public class MainActivity extends Activity {
private GridView gridView;
private List<String> urlList = new ArrayList<String>();
private ImageLoader imageLoader;
private DisplayImageOptions options; // 設定圖檔顯示相關參數
private String uri1 =
"https://ss1.bdstatic.com/70cFuXSh_Q1YnxGkpoWK1HF6hhy/it/u=3063552411,3030228420&fm=111&gp=0.jpg";
private String uri2 =
"https://ss3.bdstatic.com/70cFv8Sh_Q1YnxGkpoWK1HF6hhy/it/u=2546610023,3120506294&fm=111&gp=0.jpg";
private String uri3 =
"https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=4236942158,2307642402&fm=116&gp=0.jpg";
private String uri4 =
"https://ss1.bdstatic.com/70cFuXSh_Q1YnxGkpoWK1HF6hhy/it/u=1589956140,1606448699&fm=116&gp=0.jpg";
private String uri5 =
"https://ss1.bdstatic.com/70cFuXSh_Q1YnxGkpoWK1HF6hhy/it/u=1017606633,46849118&fm=111&gp=0.jpg";
private String uri6 =
"https://ss1.bdstatic.com/70cFvXSh_Q1YnxGkpoWK1HF6hhy/it/u=1861283441,1807800896&fm=111&gp=0.jpg";
private String uri7 =
"https://ss1.bdstatic.com/70cFuXSh_Q1YnxGkpoWK1HF6hhy/it/u=2033765348,1346395611&fm=116&gp=0.jpg";
private String uri8 =
"https://ss1.bdstatic.com/70cFvXSh_Q1YnxGkpoWK1HF6hhy/it/u=731307697,3873909574&fm=111&gp=0.jpg";
private String uri9 =
"https://ss3.bdstatic.com/70cFv8Sh_Q1YnxGkpoWK1HF6hhy/it/u=4271053251,2424464488&fm=116&gp=0.jpg";
private String uri10 =
"https://ss1.bdstatic.com/70cFuXSh_Q1YnxGkpoWK1HF6hhy/it/u=161888459,1712714238&fm=116&gp=0.jpg";
private String uri11 = // 改路徑錯誤,為了測試加載失敗的時候顯示的圖檔
"https://ss1.bdstatic.com/70cFuXSh_Q1YnxGkpoWK1HF6hhy/it/=2189035302,1073444789&fm=111&gp=0.jpg";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
urlList.add(uri1);
urlList.add(uri2);
urlList.add(uri3);
urlList.add(uri4);
urlList.add(uri5);
urlList.add(uri6);
urlList.add(uri7);
urlList.add(uri8);
urlList.add(uri9);
urlList.add(uri10);
urlList.add(uri11);
gridView = (GridView) findViewById(R.id.gridView);
gridView.setAdapter(new GridAdapter(getApplicationContext()));
imageLoader = ImageLoader.getInstance();
// 使用DisplayImageOptions.Builder()建立DisplayImageOptions
options = new DisplayImageOptions.Builder().showImageOnLoading(R.drawable.ic_stub) // 設定圖檔下載下傳期間顯示的圖檔
.showImageForEmptyUri(R.drawable.bg_img)
// 設定圖檔Uri為空或是錯誤的時候顯示的圖檔
.showImageOnFail(R.drawable.bg_img)
// 設定圖檔加載或解碼過程中發生錯誤顯示的圖檔
.cacheInMemory(true)
// 設定下載下傳的圖檔是否緩存在記憶體中
.cacheOnDisc(true)
// 設定下載下傳的圖檔是否緩存在SD卡中
// .displayer(new RoundedBitmapDisplayer(20))
// 設定成圓角圖檔
.build(); // 建構完成
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
class GridAdapter extends BaseAdapter {
private Context context;
public GridAdapter(Context context) {
this.context = context;
}
@Override
public int getCount() {
return urlList.size();
}
@Override
public Object getItem(int position) {
return urlList.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder viewHolder = null;
if (convertView == null) {
convertView = LayoutInflater.from(context).inflate(R.layout.img_item, null);
viewHolder = new ViewHolder();
viewHolder.imgItem = (ImageView) convertView.findViewById(R.id.icon);
convertView.setTag(viewHolder);
}
else {
viewHolder = (ViewHolder) convertView.getTag();
}
// !!!加載圖檔
imageLoader.displayImage(urlList.get(position), viewHolder.imgItem, options, new ImageLoadingListener() {
// 該參數可選
@Override
public void onLoadingStarted(String arg0, View arg1) {
// 開始加載
}
@Override
public void onLoadingFailed(String arg0, View arg1, FailReason arg2) {
// 加載失敗
}
@Override
public void onLoadingComplete(String arg0, View arg1, Bitmap arg2) {
// 加載完成
}
@Override
public void onLoadingCancelled(String arg0, View arg1) {
// 加載取消
}
}, new ImageLoadingProgressListener() {
// 該參數可選
@Override
public void onProgressUpdate(String arg0, View arg1, int arg2, int arg3) {
// 更新進度條
}
});
return convertView;
}
class ViewHolder {
ImageView imgItem;
}
}
}
資源檔案這裡不在列出
如果有不了解的地方,詳見:
http://blog.csdn.net/wuqingyidongren/article/details/51135978