Android常用工具类

package com.kuangye.helper; import java.io.BufferedInputStream; import java.io.BufferedOutputStream; import java.io.ByteArrayOutputStream; import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.lang.ref.SoftReference; import java.net.HttpURLConnection; import java.net.URL; import java.util.LinkedHashMap; import java.util.Map; import android.content.Context; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.os.AsyncTask; import android.os.Build; import android.os.Environment; import android.os.StatFs; import android.util.LruCache; import android.widget.ImageView; public class ImageDownloadHelper { public final String TAG = "ImageDownloaderHelper"; // public HashMap<String, MyAsyncTask> map = new HashMap<String, // MyAsyncTask>(); public Map<String, SoftReference<Bitmap>> softCaches = new LinkedHashMap<String, SoftReference<Bitmap>>(); public LruCache<String, Bitmap> lruCache = null; public interface OnImageDownloadListener { void onImageDownload(Bitmap bitmap, String imgUrl); } public ImageDownloadHelper() { int memoryAmount = (int) Runtime.getRuntime().maxMemory(); // 鑾峰彇鍓╀綑鍐呭瓨鐨?鍒嗕箣涓?綔涓虹紦瀛? int cacheSize = memoryAmount / 8; if (lruCache == null) { lruCache = new MyLruCache(cacheSize); } } // 寮傛鍔犺浇鍥剧墖鏂规硶 public void myDownloadImage(Context context, String url, ImageView imageView, OnImageDownloadListener downloadListener) { Bitmap bitmap = null; // 鍏堜粠寮哄紩鐢ㄤ腑鎷挎暟鎹? if (lruCache != null) { bitmap = lruCache.get(url); } if (bitmap != null && url.equals(imageView.getTag())) { // Log.i(TAG, "==浠庡己寮曠敤涓壘鍒版暟鎹? + bitmap.toString()); imageView.setImageBitmap(bitmap); } else { SoftReference<Bitmap> softReference = softCaches.get(url); if (softReference != null) { bitmap = softReference.get(); } // 浠庤蒋寮曠敤涓嬁鏁版嵁 if (bitmap != null && url.equals(imageView.getTag())) { // Log.i(TAG, "==浠庤蒋寮曠敤涓壘鍒版暟鎹? + bitmap.toString()); imageView.setImageBitmap(bitmap); // 娣诲姞鍒板己寮曠敤涓? lruCache.put(url, bitmap); // 浠庤蒋寮曠敤闆嗗悎涓Щ闄? softCaches.remove(url); } else { // 浠庢枃浠剁紦瀛樹腑鎷挎暟鎹? if (url != null) { String imageName = ""; imageName = getImageName(url); String cachePath = ImageDownloadHelper.SDCardHelper .getInstance().getSDCardCachePath(context); bitmap = ImageDownloadHelper.SDCardHelper.getInstance() .loadBitmapFromSDCard( cachePath + File.separator + imageName); if (bitmap != null && url.equals(imageView.getTag())) { // Log.i(TAG, "==浠庢枃浠剁紦瀛樹腑鎵惧埌鏁版嵁" + bitmap.toString()); imageView.setImageBitmap(bitmap); // 鏀惧叆寮虹紦瀛? lruCache.put(url, bitmap); } else { // 浠庣綉缁滀腑鎷挎暟鎹? // if (url != null && needCreateNewTask(imageView)) { // MyAsyncTask task = new MyAsyncTask(context, url, // imageView, downloadListener); // if (imageView != null) { // task.execute(url); // // 灏嗗搴旂殑url瀵瑰簲鐨勪换鍔″瓨璧锋潵 // map.put(url, task); // } // } new MyAsyncTask(context, url, imageView, downloadListener).execute(url); } } } } } /* * // 鍒ゆ柇鏄惁闇?閲嶆柊鍒涘缓绾跨▼涓嬭浇鍥剧墖锛屽鏋滈渶瑕侊紝杩斿洖鍊间负true public boolean * needCreateNewTask(ImageView imageView) { boolean flag = true; if * (imageView != null) { String currentTaskUrl = (String) * imageView.getTag(); if (isTaskCreated(currentTaskUrl)) { flag = false; } * } return flag; } * * // 妫?煡璇rl鎵?搴旂殑浠诲姟鏄惁琚垱寤鸿繃锛堟渶缁堝弽鏄犵殑鏄綋鍓嶇殑ImageView鐨則ag锛宼ag浼氭牴鎹畃osition鐨勪笉鍚岃?涓嶅悓锛?public * boolean isTaskCreated(String url) { boolean flag = false; if (map != null * && map.get(url) != null) { flag = true; } return flag; } * * // 鍒犻櫎map涓url瀵瑰簲鐨勪换鍔′俊鎭紝杩欎竴姝ュ緢閲嶈锛屼笉鐒禡yAsyncTask鐨勫紩鐢ㄤ細鈥滀竴鐩粹?瀛樺湪浜巑ap涓紝鑰屾棤娉曞啀娆℃墽琛岃浠诲姟 * public void removeTaskFromMap(String url) { if (url != null && map != * null && map.get(url) != null) { map.remove(url); } } */ // 寮傛浠诲姟绫? class MyAsyncTask extends AsyncTask<String, Void, Bitmap> { public Context context; public ImageView mImageView; public String url; public OnImageDownloadListener downloadListener; public MyAsyncTask(Context context, String url, ImageView mImageView, OnImageDownloadListener downloadListener) { this.context = context; this.url = url; this.mImageView = mImageView; this.downloadListener = downloadListener; } @Override protected Bitmap doInBackground(String... params) { Bitmap bm = null; try { String urlString = params[0]; URL urlObj = new URL(urlString); HttpURLConnection httpConn = (HttpURLConnection) urlObj .openConnection(); httpConn.setDoInput(true); httpConn.setRequestMethod("GET"); httpConn.connect(); if (httpConn.getResponseCode() == 200) { InputStream is = httpConn.getInputStream(); bm = BitmapFactory.decodeStream(is); } if (bm != null) { String imageName = getImageName(urlString); boolean flag = ImageDownloadHelper.SDCardHelper .getInstance().saveBitmapToSDCardPrivateCacheDir( bm, imageName, context); if (flag) { // Log.i(TAG, "==浠庣綉缁滀腑鎵惧埌鏁版嵁" + bm.toString()); // 鏀惧叆寮虹紦瀛? lruCache.put(urlString, bm); } else { // removeTaskFromMap(urlString); } return bm; } else { // removeTaskFromMap(urlString); } } catch (Exception e) { e.printStackTrace(); // removeTaskFromMap(urlString); } return null; } @Override protected void onPostExecute(Bitmap result) { super.onPostExecute(result); // 鍥炶皟璁剧疆鍥剧墖 if (downloadListener != null && result != null) { downloadListener.onImageDownload(result, url); // 璇rl瀵瑰簲鐨則ask宸茬粡涓嬭浇瀹屾垚锛屼粠map涓皢鍏跺垹闄? // removeTaskFromMap(url); } } } // 寮哄紩鐢ㄧ紦瀛樼被 class MyLruCache extends LruCache<String, Bitmap> { public MyLruCache(int maxSize) { super(maxSize); } @Override protected int sizeOf(String key, Bitmap value) { return value.getHeight() * value.getWidth() * 4; // Bitmap鍥剧墖鐨勪竴涓儚绱犳槸4涓瓧鑺? // return value.getRowBytes() * value.getHeight(); } @Override protected void entryRemoved(boolean evicted, String key, Bitmap oldValue, Bitmap newValue) { if (evicted) { SoftReference<Bitmap> softReference = new SoftReference<Bitmap>( oldValue); softCaches.put(key, softReference); } } } // SDCard宸ュ叿绫? static class SDCardHelper { public static SDCardHelper sdCardHelper; public static SDCardHelper getInstance() { if (sdCardHelper == null) { sdCardHelper = new SDCardHelper(); } return sdCardHelper; } // 鍒ゆ柇SDCard鏄惁鎸傝浇 public boolean isSDCardMounted() { return Environment.getExternalStorageState().equals( Environment.MEDIA_MOUNTED); } // 鑾峰彇SDCard鐨勬牴鐩綍璺緞 public String getSDCardBasePath() { if (isSDCardMounted()) { return Environment.getExternalStorageDirectory() .getAbsolutePath(); } else { return null; } } // 鑾峰彇SDCard鐨勫畬鏁寸┖闂村ぇ灏? public long getSDCardTotalSize() { long size = 0; if (isSDCardMounted()) { StatFs statFs = new StatFs(getSDCardBasePath()); // if (Build.VERSION.SDK_INT >= 18) { // size = statFs.getTotalBytes(); // } else { // size = statFs.getBlockCount() * s