Android入门之文件系统操作（一）简单的文件浏览器

Android入门之文件系统操作（一）简单的文件浏览器

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;
}

}
}