如何使用Universal Image Loader加载本地图片

来源：互联网发布：sql万能钥匙编辑：程序博客网时间：2024/05/21 16:22

本篇通过使用UIL（Universal Image Loader）加载本地图片，先上图：

这里使用GridView布局，通过getContentResolver获取手机保存的图片：

/** * 获取本地图片 *  * @param context * @return */@SuppressLint("UseSparseArrays")public static HashMap<Integer, Model> getMediaImage(Context context) {HashMap<Integer, Model> datas = new HashMap<Integer, Model>();final String orderBy = MediaStore.Images.Media.DATE_TAKEN;final String[] columns = { MediaStore.Images.Media.DATA,MediaStore.Images.Media._ID,MediaStore.Images.Media.BUCKET_DISPLAY_NAME };Cursor imagecursor = context.getContentResolver().query(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, columns, null,null, orderBy + " DESC");for (int i = 0; i < imagecursor.getCount(); i++) {imagecursor.moveToPosition(i);int dataColumnIndex = imagecursor.getColumnIndex(MediaStore.Images.Media.DATA);int dirColumnIndex = imagecursor.getColumnIndex(MediaStore.Images.Media.BUCKET_DISPLAY_NAME);String buckedName = imagecursor.getString(dirColumnIndex);Log.v("image", "buckedName = " + buckedName);String filename = imagecursor.getString(dataColumnIndex);try {File file = new File(filename);if (!file.exists()) {continue;}} catch (Exception e) {continue;}Log.v("image", "filename = " + filename);Model galleryModel = new Model("file:/" + imagecursor.getString(dataColumnIndex).toString(), false);// false是为了解决checkbox错乱的问题datas.put(i, galleryModel);}imagecursor.close();return datas;}

适配器：

public class MyListAdapter extends BaseAdapter {private Context context;private HashMap<Integer, Model> datas;private ImageLoader imageLoader;private DisplayImageOptions options;public MyListAdapter(Context context, HashMap<Integer, Model> datas){this.context = context;this.datas = datas;imageLoader = ImageLoader.getInstance();imageLoader.init(ImageLoaderConfiguration.createDefault(context));options = new DisplayImageOptions.Builder().showImageOnLoading(R.drawable.ic_stub).showImageForEmptyUri(R.drawable.ic_empty).showImageOnFail(R.drawable.ic_error).cacheInMemory(true).cacheOnDisk(true).considerExifParams(true).bitmapConfig(Bitmap.Config.RGB_565).build();}@Overridepublic int getCount() {return datas.size();}@Overridepublic Object getItem(int position) {return position;}@Overridepublic long getItemId(int position) {return position;}@Overridepublic View getView(int position, View convertView, ViewGroup parent) {View view = convertView;final ViewHolder holder;if(convertView == null){view = LayoutInflater.from(context).inflate(R.layout.listview_item, parent , false);holder = new ViewHolder();holder.image = (ImageView) view.findViewById(R.id.image);holder.chBox = (CheckBox) view.findViewById(R.id.checkBox);view.setTag(holder);} else{holder = (ViewHolder) view.getTag();}holder.chBox.setChecked(datas.get(position).isChecked);imageLoader.displayImage(datas.get(position).url, holder.image, options);return view;}private static class ViewHolder {ImageView image;CheckBox chBox;}}

ListView的item布局文件layout/listview_item：

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="wrap_content"    android:background="#000000"    android:paddingRight="8dp" >    <ImageView        android:id="@+id/image"        android:layout_width="80dp"        android:layout_height="80dp"        android:layout_alignParentLeft="true"        android:layout_marginBottom="6dp"        android:layout_marginTop="6dp"        android:background="@drawable/ic_empty"        android:gravity="center_vertical"        android:scaleType="centerCrop" />    <CheckBox        android:id="@+id/checkBox"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignParentRight="true"        android:layout_centerVertical="true"        android:background="@null"        android:button="@drawable/checkbox_selector"        android:focusable="false"        android:gravity="center_vertical" /></RelativeLayout>

Demo下载地址

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