XListView網路載入圖片,下拉重新整理
阿新 • • 發佈:2018-12-14
MainActivity.java
public class MainActivity extends AppCompatActivity { private XListView contents; private int page = 0; private MyBaseAdapter adapter; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); contents = findViewById(R.id.contents); adapter = new MyBaseAdapter(getLayoutInflater()); contents.setAdapter(adapter); //是否開啟下拉重新整理 上拉載入 //contents.setPullRefreshEnable(false); contents.setPullLoadEnable(true); contents.setXListViewListener(new XListView.IXListViewListener() { @Override public void onRefresh() { page = 0; loadData(page); //載入重新整理資料 } @Override public void onLoadMore() { loadData(page); } }); //一進來就去載入第一頁資料 loadData(page); } private String url = "http://apis.juhe.cn/cook/query?key=3ec004200a6a2f4cf4774e480c006375&menu=%E8%A5%BF%E7%BA%A2%E6%9F%BF&rn=10&pn="; private void loadData(int page) { String requestUrlWithPageNum = url + page; //載入網路資料 new AsyncTask<String, Void, List<DataItem>>() { @Override protected List<DataItem> doInBackground(String... strings) { ResponseBean responseBean = null; try { URL url = new URL(strings[0]); HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection(); urlConnection.setRequestMethod("GET"); urlConnection.setConnectTimeout(5000); urlConnection.setReadTimeout(5000); int responseCode = urlConnection.getResponseCode(); if (responseCode == 200) { String str = stream2String(urlConnection.getInputStream()); responseBean = new Gson().fromJson(str, ResponseBean.class); } else { // } return responseBean == null ? null : responseBean.getResult().getData(); } catch (MalformedURLException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } return null; } @Override protected void onPostExecute(List<DataItem> dataItems) { if (dataItems == null) { Toast.makeText(MainActivity.this, "請求資料錯誤", Toast.LENGTH_LONG).show(); return; } //更新資料 updateData(dataItems); loadCompleted(); } }.execute(url); } private String stream2String(InputStream is) throws IOException { BufferedReader br = new BufferedReader(new InputStreamReader(is)); StringBuilder sb = new StringBuilder(); for (String tmp = br.readLine(); tmp != null; tmp = br.readLine()) { sb.append(tmp); } return sb.toString(); } private void updateData(List<DataItem> datas) { if (page == 0) { adapter.setDatas(datas); } else { adapter.addDatas(datas); } } //通過 載入 / 重新整理 完成 private void loadCompleted() { //通過ListView:重新整理、載入完成 page++; contents.stopLoadMore(); contents.stopRefresh(); } }
MyBaseAdapter.java
public class MyBaseAdapter extends BaseAdapter { private List<DataItem> mDatas; protected LayoutInflater mInflater; /** * 更新資料 */ public void setDatas(List<DataItem> datas) { mDatas.clear(); if (datas != null) { mDatas.addAll(datas); } notifyDataSetChanged(); } /** * 追加資料 */ public void addDatas(List<DataItem> datas) { if (datas != null) { mDatas.addAll(datas); notifyDataSetChanged(); } } public MyBaseAdapter(LayoutInflater mInflater) { this.mInflater = mInflater; mDatas = new ArrayList<>(); } @Override public int getCount() { return mDatas.size(); } @Override public DataItem getItem(int position) { return mDatas.get(position); } @Override public long getItemId(int position) { return position; } @Override public View getView(int position, View convertView, ViewGroup parent) { BaseViewHolder viewHolder = null; if (convertView == null) { convertView = mInflater.inflate(R.layout.item, parent, false); viewHolder = new BaseViewHolder(convertView); } else { viewHolder = (BaseViewHolder) convertView.getTag(); } viewHolder.bindData(getItem(position)); return convertView; } public class BaseViewHolder { private View itemView; private ImageView icon; private TextView title; private TextView date; public BaseViewHolder(View itemView) { this.itemView = itemView; title = itemView.findViewById(R.id.title); date = itemView.findViewById(R.id.date); icon = itemView.findViewById(R.id.icon); itemView.setTag(this); } public void bindData(DataItem dataItem) { title.setText(dataItem.getTitle()); date.setText(dataItem.getId()); ImageLoader.getInstance().displayImage(dataItem.getFirstImageUrl(), icon, ImageLoaderConfigs.getDefaultDisplayImageOptions(icon.getContext())); } } } ImageLoader.java public class ImageLoaderConfigs { public static ImageLoaderConfiguration getImageLoaderConfiguration(Context context) { ImageLoaderConfiguration configuration = new ImageLoaderConfiguration.Builder(context) //內在快取額外選項, 最大的寬度,高度 //.memoryCacheExtraOptions(480, 800) // default = device screen dimensions 記憶體快取檔案的最大長寬 //.diskCacheExtraOptions(480, 800, null) // 本地快取的詳細資訊(快取的最大長寬),最好不要設定這個 //執行緒池配置 //.taskExecutor() //.taskExecutorForCachedImages() //.threadPoolSize(3) // default 執行緒池內載入的數量 //.threadPriority(Thread.NORM_PRIORITY - 2) // default 設定當前執行緒的優先順序 //任務處理優先順序 Fist In Fist Out //.tasksProcessingOrder(QueueProcessingType.FIFO) // default //記憶體中不快取一張圖片的多個尺寸大小 //.denyCacheImageMultipleSizesInMemory() //內在快取策略 //.memoryCache(new LruMemoryCache(2 * 1024 * 1024)) //可以通過自己的記憶體快取實現 //記憶體快取大小 //.memoryCacheSize(2 * 1024 * 1024) // 記憶體快取的最大值 //內在快取大小:佔用百分比 .memoryCacheSizePercentage(13) // default //磁碟快取策略 //.diskCache(new LruDiskCache()) // default 可以自定義快取路徑 //磁碟快取大小 .diskCacheSize(50 * 1024 * 1024) // 50 Mb sd卡(本地)快取的最大值 //.diskCacheFileCount(100) // 可以快取的檔案數量 // default為使用HASHCODE對UIL進行加密命名, 還可以用MD5(new Md5FileNameGenerator())加密 //.diskCacheFileNameGenerator(new HashCodeFileNameGenerator()) //.imageDownloader(new BaseImageDownloader(context)) // default //(new BaseImageDecoder(false)) // default //載入具體圖片時的一些配置 .defaultDisplayImageOptions(DisplayImageOptions.createSimple()) // default .writeDebugLogs() // 列印debug log .build(); return configuration; } public static DisplayImageOptions getDefaultDisplayImageOptions(Context context) { DisplayImageOptions displayImageOptions = new DisplayImageOptions.Builder() //是否快取 .cacheInMemory(true) .cacheOnDisk(true) //RGB 565 r紅色佔5 g綠色佔6 b藍色佔5 -> 2位元組 //alpha //ARGB 4444 4 4 4 4 -> 2位元組 //ARGB 8888 -> 4位元組 //10 * 10 用rgb565 -> 10*10*2 .bitmapConfig(Bitmap.Config.RGB_565) //載入時、載入錯誤時展示什麼內容 .showImageOnLoading(R.mipmap.ic_launcher) .showImageOnFail(R.mipmap.ic_launcher) // .imageScaleType(ImageScaleType.EXACTLY_STRETCHED) //載入效果 //ctrl + p .displayer(new CircleBitmapDisplayer()) .build(); //ctrl + h //BitmapDisplayer; return displayImageOptions; } }