android SD卡扫描文件

package com.my.sd; import java.io.File; import java.lang.reflect.Field; import java.util.ArrayList; import java.util.HashMap; import java.util.Iterator; import java.util.Map; import com.drandxq.gallerym.R; import android.app.Activity; import android.os.Bundle; import android.view.Window; import android.widget.Button; import android.widget.ListView; import android.widget.SimpleAdapter; import android.widget.TextView; public class testSD extends Activity { //view TextView tView ; ListView i ; Button btn ; //data private ArrayList<File> list ; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); Field[] fields = R.drawable.class.getDeclaredFields(); for (Field field : fields) { if (field.getName().startsWith(icon)) { int index = 0; try { index = field.getInt(R.drawable.class); } catch (IllegalArgumentException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IllegalAccessException e) { // TODO Auto-generated catch block e.printStackTrace(); } //����ͼƬID imgList.add(index); } } tView = (TextView)findViewById(R.id.textview1); //btn = (Button) findViewById(R.id.go); tView = new TextView(this); tView.setText("get all files in your sd card"); //init data i = (ListView) findViewById(R.id.music_list); list = new ArrayList<File>(); getAllFiles(new File("/sdcard")); SimpleAdapter ladapter = new SimpleAdapter(this,getMapData(list),R.layout.relative, new String[]{"ItemText","ItemTitle"},new int[]{R.id.ItemTitle,R.id.ItemText}); i.setAdapter(ladapter); TextView empty = new TextView(this); empty.setText("empty!"); i.setEmptyView(empty); } private ArrayList<Map<String, Object>> getMapData(ArrayList<File> list){ ArrayList<Map<String, Object>> data = new ArrayList<Map<String, Object>>(); HashMap<String,Object> item; int i = 0 ; for(i=0;i<list.size();i++){ item = new HashMap<String,Object>(); String path = list.get(i).toString(); String name = path.substring(path.lastIndexOf("/")+1,path.length()); //����ÿһ��list��Ԫ������ �� item.put("ItemText",name); item.put("ItemTitle", path); data.add(item); } return data; } private void getAllFiles(File root){ File files[] = root.listFiles(); if(files != null) for(File f:files){ if(f.isDirectory()){ getAllFiles(f); } else{ if(f.getName().indexOf(".apk")>0) this.list.add(f); } } } }