FileList(文件列表的显示)

FileListAdapter.java:

package com.cqvie;

import java.io.File;
import java.util.LinkedList;
import java.util.List;

import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;

public class FileListAdapter extends BaseAdapter {

public Activity activity; //创建View时必须要提供Context
public List<File> list=new LinkedList<File>(); //数据源
public String currPath;
private long position;

public FileListAdapter(Activity activity) {
this.activity = activity;
}

public void scanFiles(String path)
{
list.clear();
File dir=new File(path);
File[] subFiles=dir.listFiles();
if(subFiles!=null)
for(File f:subFiles)
list.add(f);
this.notifyDataSetChanged();
currPath=path;
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return list.size();
}

@Override
public Object getItem(int arg0) {
// TODO Auto-generated method stub
return null;
}

@Override
public long getItemId(int arg0) {
// TODO Auto-generated method stub
return position;
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub

View v=View.inflate(activity, R.layout.item, null);
TextView txtName= (TextView) v.findViewById(R.id.txtName);
ImageView imgIcon=(ImageView) v.findViewById(R.id.imgIcon);
File f=list.get(position);
txtName.setText(f.getName());
Bitmap bmp_folder=BitmapFactory.decodeResource(
activity.getResources(),R.drawable.folder);
Bitmap bmp_file=BitmapFactory.decodeResource(
activity.getResources(),R.drawable.file);
if(f.isDirectory())
imgIcon.setImageBitmap(bmp_folder);
else
imgIcon.setImageBitmap(bmp_file);
return v;
}

}

 

ListpracticeActivity.java:

package com.cqvie;

import java.io.File;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.Button;
import android.widget.ListView;
import android.widget.TextView;

public class ListpracticeActivity extends Activity implements OnClickListener, OnItemClickListener {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
getObjFromID();

FileListAdapter da=new FileListAdapter(this);
lv.setAdapter(da);
lv.setOnItemClickListener(this);
da.scanFiles("/");

btnUp.setOnClickListener(this);
}
ListView lv;
TextView t1;
Button btnUp;


void getObjFromID()
{
t1=(TextView) findViewById(R.id.t1);
lv=(ListView) findViewById(R.id.lv);
btnUp=(Button) findViewById(R.id.btnUp);
}

@Override
public void onItemClick(AdapterView<?> parent, View view,
int position,long id) {
FileListAdapter da= (FileListAdapter) lv.getAdapter();
File f= da.list.get(position);
if(f.isDirectory())
{
t1.setText(f.getPath());
da.scanFiles(f.getPath());
}
}
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
FileListAdapter da= (FileListAdapter) lv.getAdapter();
if(da.currPath.equals("/")) return;
File f=new File(da.currPath);
t1.setText(f.getParent());
da.scanFiles(f.getParent());
}
}

 

main.xml中的设计：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >

<LinearLayout
android:id="@+id/linearLayout1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="right" >

<Button
android:id="@+id/btnUp"
android:layout_width="wrap_content"
android:layout_height="34dp"
android:text="向上"
android:textSize="6pt" />

</LinearLayout>

<TextView
android:id="@+id/t1"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/hello"
android:textColor="#fff000" />

<ListView
android:id="@+id/lv"
android:layout_width="match_parent"
android:layout_height="wrap_content" >

</ListView>

</LinearLayout>

 

item.xml中的设计：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >

<ImageView
android:id="@+id/imgIcon"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="@+id/txtSize"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:src="@drawable/folder" ></ImageView>

<TextView
android:id="@+id/txtName"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_toRightOf="@+id/imgIcon"
android:gravity="right"
android:text="TextView"
android:textSize="10pt" />

<TextView
android:id="@+id/txtSize"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_below="@+id/txtName"
android:layout_toRightOf="@+id/imgIcon"
android:gravity="right"
android:text="TextView"
android:textSize="6pt" />

</RelativeLayout>

 

运行的结果：

 

 

ic_launcher.png  folder.png  file.png