Android入门之文件系统操作（一）简单的文件浏览器 （转）

Android入门之文件系统操作（一）简单的文件浏览器 （转）

      

   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;
  } 

 }
  }