Android入门之文件系统操作（一）简单的文件浏览器

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import java.io.File;
import java.util.*;

import android.app.Activity;
import android.content.Context;
import android.os.*;
import android.view.*;
import android.widget.*;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ImageView.ScaleType;

public class FileBrowser extends Activity {

    private ListView mainListView=null;
    private List<Map<String,Object>> list=null;

    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        this.setTitle("文件浏览器");
        mainListView=new ListView(this);
        setContentView(mainListView);

        File file=Environment.getRootDirectory();
        String pathx=file.getAbsolutePath();
        this.setTitle(pathx);
        //android的总目录就是"/"
        list_init("/");
    }

    void list_init(String path){
        File file=new File(path);
        File[] fileList=file.listFiles();
        list=new ArrayList<Map<String,Object>>();
        Map<String,Object> item;
        item=new HashMap<String,Object>();
        if(path.equals("/")){
            item.put("ico",R.drawable.home);
            item.put("name","总目录列表");
            item.put("path","/");
            list.add(item);
        }else{
            item.put("ico",R.drawable.back);
            item.put("name","返回上一级");
            item.put("path",file.getParent());
            list.add(item);
        }
        for(int i=0;i<fileList.length;i++){
            item=new HashMap<String,Object>();
            if(fileList[i].isDirectory()){
                if(fileList[i].list().length<1){
                    item.put("ico",R.drawable.file1);
                }else{
                    item.put("ico",R.drawable.file2);
                }
            }else{
                item.put("ico",R.drawable.content);
            }
            item.put("name",fileList[i].getName());
            item.put("path",fileList[i].getAbsolutePath());
            list.add(item);
        }
        MyAdapter ma=new MyAdapter(this,list);
        //mainListView=new ListView(this);
        mainListView.setAdapter(ma);
        mainListView.setOnItemClickListener(new OnItemClickListener(){
            public void onItemClick(AdapterView<?> arg0, View arg1,int arg2, long arg3) {
                if(arg2>0 && (Integer)(list.get(arg2).get("ico"))==R.drawable.content){
                    //非文件夹图标，点击无效
                }else{
                    //打开下一级文件目录列表
                    list_init((String)(list.get(arg2).get("path")));
                }
            }
        });
        this.setTitle(path);
    }

    public class MyAdapter extends BaseAdapter{

        Context context=null;
        List<Map<String,Object>> list=null;

        MyAdapter(Context context,List<Map<String,Object>> list){
            this.context=context;
            this.list=list;
        }
        public int getCount() {return list.size();}
        public Object getItem(int position) {return position;}
        public long getItemId(int position) {return position;}

        public View getView(int position, View convertView, ViewGroup parent) {
            LinearLayout returnView=new LinearLayout(context);
            returnView.setLayoutParams(new ListView.LayoutParams(-1,-2));//注意:ListView.LayoutParams
            //图标
            ImageView iv=new ImageView(context);
            LinearLayout.LayoutParams lp_iv=new LinearLayout.LayoutParams(-2,-2);
            lp_iv.rightMargin=10;
            iv.setLayoutParams(lp_iv);
            iv.setScaleType(ScaleType.CENTER_INSIDE);
            iv.setImageResource((Integer)((list.get(position)).get("ico")));
            returnView.addView(iv);
            //文件名
            TextView name=new TextView(context);
            LinearLayout.LayoutParams lp_tv=new LinearLayout.LayoutParams(-2,-2);
            name.setLayoutParams(lp_tv);
            name.setTextSize(name.getTextSize()+10);
            name.setText((String)(list.get(position).get("name")));
            returnView.addView(name);
            //
            return returnView;
        }

    }
}