ListView显示任意指定目录下的文件列表
转载请注明出处
adapter
package com.tianlei.test;
import java.io.File;
import java.text.DecimalFormat;
import java.util.LinkedList;
import java.util.List;
import android.annotation.SuppressLint;
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.CheckBox;
import android.widget.ImageView;
import android.widget.TextView;
public class FileAdapter 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（文件列表）
public String currPath;//当前路径
private Bitmap bmp_folder,bmp_file;
public int getCount() {
// TODO Auto-generated method stub
return list.size();
}
public Object getItem(int arg0) {
// TODO Auto-generated method stub
return list.get(arg0);
}
public int getItemViewType(int position){
return position;
}
public long getItemId(int position) {
// TODO Auto-generated method stub
return position;
}
public View getView(int position, View arg1, ViewGroup arg2) {
// TODO Auto-generated method stub
View v=View.inflate(activity,R.layout.item,null);
TextView Txt_Name=(TextView) v.findViewById(R.id.Txt_Name);
TextView Txt_Size=(TextView) v.findViewById(R.id.Txt_Size);
ImageView img=(ImageView) v.findViewById(R.id.image_ico);
// CheckBox checkBox = (CheckBox)v.findViewById(R.id.button_delete);
/*很重要：内容和list通过适配器Adapter进行连接显示。
* 首先将ListView和Adapter进行连接。
* 内容和Adapter连接是通过list.add()和list.get(position)
* 获取list中指定位置的元素:将list中的元素显示*/
File f=list.get(position);
Txt_Name.setText(f.getName());//文件名字
Txt_Size.setText(setFileSize(getFolderOrFileSize(f)));//文件夹大小
if(f.isDirectory()){
Txt_Size.setText("文件夹");
}
if(f.isDirectory()){
img.setImageBitmap(bmp_folder);
}else{
img.setImageBitmap(bmp_file);
}
return v;
}
public void scanFiles(String path)
{
list.clear();/*清空list*/
File dir=new File(path);/*指定路径*/
File[] subFiles=dir.listFiles();//把该路径下的所有文件放入一数组，目的是添加到list
if(subFiles!=null)/*该路径下有文件*/
for(File f:subFiles)
list.add(f);//添加到list并显示该目录下的所有文件
this.notifyDataSetChanged();
currPath=path;
}
public FileAdapter(Activity activity)
{
this.activity=activity;
bmp_folder=BitmapFactory.decodeResource(activity.getResources(),R.drawable.folder);//文件夹,decodeResource图片解码，source资源，解码为Bitmap类型；
bmp_file=BitmapFactory.decodeResource(activity.getResources(),R.drawable.file);//文件
}
public static long getFolderOrFileSize(File file)
{
long size = 0;
/*计算文件夹大小：有bug */
/*if(file.isDirectory()){
File[] fileList = file.listFiles();
for(int i=0; i<fileList.length; i++){
if(fileList[i].isDirectory()){
size = size + getFolderOrFileSize(fileList[i]);
}else{
size = size + fileList[i].length();
}
}
}*/
if(file.isFile())
size = file.length();
return size;
}
/**
* 文件大小单位转换
*
* @param size
* @return
*/
@SuppressLint("UseValueOf")
public String setFileSize(long size) {
DecimalFormat df = new DecimalFormat("###.###");
float f = ((float) size / (float) (1024 * 1024));/*判断是否<1M*/
if(size<1024){
return df.format(new Float(size).doubleValue()) + "B";
}else if ( f < 1.0) {
float f1 = ((float) size / (float) (1024));//1KB
return df.format(new Float(f1).doubleValue()) + "KB";
}else if(f/(float)(1024)<1.0){
return df.format(new Float(f).doubleValue()) + "M";
}else{
return df.format(new Float(f/(float)(1024)).doubleValue()) + "G";
}
}
}
2.Activity
public class TestFileActivity extends Activity{
/** Called when the activity is first created. */
ListView listView; /*显示数据的列表*/
TextView Txt_Path;
private String filepath;
private Filter filter;
public EditText editText;
private long which;
private FileAdapter adapter;
private int position;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.testfile);
listView=(ListView) findViewById(R.id.List_View);
Txt_Path=(TextView) findViewById(R.id.Txt_Path);
adapter=new FileAdapter(this);
listView.setAdapter(adapter);/*通过BaseAdapter下面的getview()方法显示*/
listView.setOnItemClickListener(new ItemClickListener());
//listView.setOnItemLongClickListener(new ItemLongClickListener());
/*显示指定路径下的文件*/
adapter.scanFiles("/sdcard/COM/");
/*为视图（要显示上下文菜单的视图）注册上下文菜单ContextMenu*/
registerForContextMenu(listView);
}
public class ItemClickListener implements OnItemClickListener{
private File f;
public void onItemClick(AdapterView<?> parent, View v, int positiong, long id) {
// TODO Auto-generated method stub
FileAdapter da=(FileAdapter) listView.getAdapter();
f=da.list.get(positiong);
if(f.isDirectory()){
Txt_Path.setText(f.getPath());
da.scanFiles(f.getPath());
}
else if(f.isFile()){
android.app.AlertDialog.Builder builder = new AlertDialog.Builder(TestFileActivity.this);
builder.setTitle("功能列表:");
builder.setItems(R.array.listFunction, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
String[] s = getResources().getStringArray(R.array.listFunction);//获得资源列表
if(s[which].equals("运行")){
}else if(s[which].equals("删除文件")){
f.delete();
if(adapter != null){
//adapter.notifyDataSetChanged();//实时数据刷新
/*显示指定路径下的文件*/
adapter.scanFiles("/sdcard/COM/");
}
}else if(s[which].equals("上传到云端")){
//采用socket
}
}
});
builder.create().show();
}
}
}
3.item布局
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/RelativeLayout01" android:layout_width="wrap_content" android:layout_height="wrap_content" android:orientation="horizontal" > <ImageView android:id="@+id/image_ico" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentLeft="true" android:src="@drawable/folder" android:layout_centerVertical="true" /> <LinearLayout android:id="@+id/linear01" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_toRightOf="@+id/image_ico" android:orientation="vertical" > <TextView android:id="@+id/Txt_Name" android:layout_width="fill_parent" android:layout_height="20dp" android:text="TextView" /> <TextView android:id="@+id/Txt_Size" android:layout_width="fill_parent" android:layout_height="20dp" android:text="TextView" /> </LinearLayout> <!-- <CheckBox android:id="@+id/button_delete" android:layout_width="wrap_content" android:layout_height="wrap_content" android:checked="false" android:layout_alignParentRight="true"/> --> </RelativeLayout>
4.Activity布布局文件
<?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" android:background="@android:color/white" > <TextView android:id="@+id/Txt_Path" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center_horizontal" android:textSize="25dp" android:text="测试文件列表" /> <ListView android:id="@+id/List_View" android:layout_width="fill_parent" android:layout_height="wrap_content" android:cacheColorHint="#00000000" <!-- 滑动列表时，底部不变色 --> android:fadingEdge="none" > </ListView> </LinearLayout>