Android:漫画APP开发笔记之从Assets本地读取图片

list为Assets下目录名

//本地读取 private ArrayList<PicListInfo> getImageFromAssetsFile(String list){String test=list; ArrayList<PicListInfo> newpiclistinfo = new ArrayList<PicListInfo>(); String[] list_image = null;try {//得到assets/list/目录下的所有文件的文件名，，以便后面打开操作时使用list_image = this.getAssets().list(list);} catch (IOException e1) {// TODO Auto-generated catch blocke1.printStackTrace();}for(int i=0;i<list_image.length;++i){InputStream open = null;try {String temp = list+"/"+list_image[i];open = this.getAssets().open(temp);Bitmap bitmap = BitmapFactory.decodeStream(open);PicListInfo pi = new PicListInfo();pi.setPicUrl(bitmap);newpiclistinfo.add(0,pi);// Assign the bitmap to an ImageView in this layout} catch (IOException e) {e.printStackTrace();} finally {if (open != null) {try {open.close();} catch (IOException e) {e.printStackTrace();}}}} Collections.reverse(newpiclistinfo); piclistinfo.addAll(newpiclistinfo); sla.notifyDataSetChanged();return piclistinfo;} PicListAdapter.java

package com.cartoon.adapters;import java.util.ArrayList;import com.cartoon.R;import android.content.Context;import android.view.LayoutInflater;import android.view.View;import android.view.View.MeasureSpec;import android.view.ViewGroup;import android.view.ViewGroup.MarginLayoutParams;import android.view.WindowManager;import android.widget.ArrayAdapter;import android.widget.ImageView;import android.widget.ListAdapter;import android.widget.ListView;import android.widget.RelativeLayout;import android.widget.TextView;public class PicListAdapter extends ArrayAdapter<PicListInfo>{public PicListAdapter(Context context, int textViewResourceId, ArrayList<PicListInfo> objects){super(context, textViewResourceId, objects);}@Overridepublic View getView(int position, View convertView, ViewGroup parent) {ViewHolder holder =null;View view;WindowManager wm = (WindowManager) getContext().getSystemService(Context.WINDOW_SERVICE);int width = wm.getDefaultDisplay().getWidth();int height = wm.getDefaultDisplay().getHeight();if (convertView == null) {view = LayoutInflater.from(getContext()).inflate(R.layout.piclist_item, null);holder = new ViewHolder();holder.piclist_item = (ImageView)view.findViewById(R.id.piclist_item);//设置图片的位置ViewGroup.LayoutParams margin = new ViewGroup.LayoutParams(holder.piclist_item.getLayoutParams());RelativeLayout.LayoutParams layoutParams = new RelativeLayout.LayoutParams(margin);layoutParams.height = (int) (width*0.5677);//设置图片的高度layoutParams.width = width; //设置图片的宽度layoutParams.setMargins(15, 0, 15, 0);holder.piclist_item.setLayoutParams(layoutParams);holder.piclist_item.setScaleType(ImageView.ScaleType.FIT_START);view.setTag(holder);} else {view = convertView;holder = (ViewHolder)convertView.getTag();}final PicListInfo singleoder = getItem(position);if (singleoder != null) {holder.piclist_item.setImageBitmap(singleoder.getPicUrl());}return view;}public class ViewHolder{public ImageView piclist_item;}}PicListInfo.java

package com.cartoon.adapters;import android.graphics.Bitmap;public class PicListInfo {private Bitmap PicUrl; //图片地址//下面是上面属性的get和set方法public Bitmap getPicUrl() {return PicUrl;}public void setPicUrl(Bitmap picUrl) {PicUrl = picUrl;}}

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