Android手机文件管理

package com.testview;

import java.util.List;
import java.util.Map;

import android.content.Context;
import android.graphics.Color;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;

public class MyAdapter extends BaseAdapter {
    private LayoutInflater mInflater;
    private List<Map<String, Object>>mData ;
    private int  selectItem=-1;
    private int[] layout;
    public MyAdapter(Context context, List<Map<String, Object>>mData, int[] layout) {
     this.mInflater = LayoutInflater.from(context);
     this.mData = mData;
     this.layout = layout;
    }
    public int getCount() {
     return mData.size();
    }
    public Object getItem(int arg0) {
     return mData.get(arg0);
    }
    public long getItemId(int arg0) {
     return arg0;
    }
    public View getView(int position, View convertView, ViewGroup parent) {
     ViewHolder holder = null;
     if (convertView == null) {
      holder = new ViewHolder();
      convertView = mInflater.inflate(layout[0], null);
      holder.titleText = (TextView) convertView.findViewById(layout[1]);
      holder.infoText = (TextView) convertView.findViewById(layout[2]);
      
      convertView.setTag(holder);   
     } else {
      holder = (ViewHolder) convertView.getTag();
     }
     holder.titleText.setText((String) mData.get(position).get("title"));
     holder.infoText.setText((String) mData.get(position).get("info"));   
     
     if (position == selectItem) {
      convertView.setBackgroundColor(0xaeefcc00);
     } 
     else {
         convertView.setBackgroundColor(Color.BLACK);
     }
     convertView.getBackground().setAlpha(20);//0~255透明度值
     return convertView;
    }
    public  void setSelectItem(int selectItem) {
      this.selectItem = selectItem;
    }

}

package com.testview;

import java.io.File;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import com.util.SDUtil;
import android.app.Activity;
import android.app.AlertDialog;
import android.os.Bundle;
import android.os.Environment;
import android.view.KeyEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.AdapterView;
import android.widget.EditText;
import android.widget.ImageButton;
import android.widget.ListView;

public class TestListViewActivity extends Activity {
    /**
     * 数据存储
     */
    private List<Map<String, Object>> mData;
    
    /**
     * 当前访问路径
     */
    private String currentPath = "/sdcard";
    
    private ListView setlistViewLeft;
    /**
     * 自定义数据适配器
     */
    private MyAdapter adapter;
    
    /**
     * 文件名称
     */
    private String[] fileNames = null;
    
    /**
     * 文件路径
     */
    private String[] filePaths = null;
    
    private EditText editText;
    private ImageButton imageBtn;
    
    private int[] layout = {
            R.layout.listinfo, 
            R.id.titleleftlist, 
            R.id.infoleftlist
            };
    
    @Override
    public void onCreate(Bundle savedInstanceState) {
     super.onCreate(savedInstanceState);
     setContentView(R.layout.main);
     setTitle("文件总数："+getSDCardMassage(currentPath)+"\n"+"当前路径："+currentPath);
     getSearchKey();
     mData = getListItems();  
     setlistViewLeft = (ListView)findViewById(R.id.listleft); 
     adapter = new MyAdapter(this, mData, layout);
     setlistViewLeft.setAdapter(adapter);
     setlistViewLeft.setOnItemClickListener(mLeftListOnItemClick);
    }
    
    /**
     * 初始化数据
     */
    public void getSearchKey(){
        editText = (EditText) findViewById(R.id.entry);
        imageBtn = (ImageButton) findViewById(R.id.btn_imageButton);
        imageBtn.setOnClickListener(new OnClickListener() {
            
            @Override
            public void onClick(View v) {
                String searchKey = editText.getText().toString();
                if(searchKey == null || "".equals(searchKey)){
                    return;
                }
                int length = fileNames.length;
                String[] strKeyName = {};
                String[] strKeyPath = {};
                for(int i = 0; i < length; i++){
                    String name = fileNames[i];
                    if(name.contains(searchKey)){
                        strKeyName = Arrays.copyOf(strKeyName, strKeyName.length+1);
                        strKeyPath = Arrays.copyOf(strKeyPath, strKeyPath.length+1);
                        strKeyName[strKeyName.length-1] = name;
                        strKeyPath[strKeyPath.length-1] = filePaths[i];
                    }
                }
                if(strKeyName.length > 0){
                    //初始化数据
                    setSearchKeyData(strKeyName, strKeyPath);
                    
                }else{
                new AlertDialog.Builder(TestListViewActivity.this)
                     .setTitle("消息")
                     .setMessage("文件不存在")
                     .setPositiveButton("确定", null)
                     .show();
                }
            }

            
        });
    }
    
    /**
     * 初始化搜索数据
     * @param strKeyName
     * @param strKeyPath
     */
    private void setSearchKeyData(String[] strKeyName, String[] strKeyPath) {
        fileNames = strKeyName;
        filePaths = strKeyPath;
        mData = getListItems();
        setTitle("文件总数："+strKeyName.length+"\n"+"当前路径："+currentPath);
        initAdapter();
    }
    
    /**
     * 初始化数据
     * @param path 文件路径
     */
    public void initData(String path){
        currentPath = path;
        setTitle("文件总数："+getSDCardMassage(path)+" "+currentPath);
        mData = getListItems();
        editText.setText(null);
        initAdapter();
    }
    
    public void initAdapter(){
        setlistViewLeft = (ListView)findViewById(R.id.listleft);
        adapter = new MyAdapter(this, mData, layout);
        setlistViewLeft.setAdapter(adapter);
        setlistViewLeft.setOnItemClickListener(mLeftListOnItemClick);
    }
    
    private List<Map<String,Object>> getListItems(){
        List<Map<String,Object>> listItems = new ArrayList<Map<String,Object>>();
        for(int i=0;i<fileNames.length;i++){
         Map<String,Object> map = new HashMap<String, Object>();
         map.put("title", "文件名称");
         map.put("info", fileNames[i]);
         listItems.add(map);
        }
        return listItems;
       }
    
    AdapterView.OnItemClickListener mLeftListOnItemClick = new AdapterView.OnItemClickListener() {

        @Override
        public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
                long arg3) {
            
            adapter.setSelectItem(arg2);
            adapter.notifyDataSetInvalidated();
            String v2 = mData.get(arg2).get("info").toString();
            String str = filePaths[arg2];
            if(str != null){
                //重新初始化界面
                mData.clear();
                currentPath = str;
                initData(str);
            }else{
                SDUtil.openFile(TestListViewActivity.this,  currentPath+"/"+v2);
            }
            
        }
        
       };
    /**
     * 重写手机返回键事件  
     */
       public boolean onKeyDown(int keyCode, android.view.KeyEvent event) {
        if(keyCode == KeyEvent.KEYCODE_BACK ){
             back();
             return true;
        }
        return super.onKeyDown(keyCode, event);
     };
    
    /**
     * 返回数据初始化
     */
    private void back() {
        String path = new File(currentPath).getParentFile().getPath();
        if("/sdcard".equals(currentPath)){
            finish();
            return;
        }
        initData(path);
    }
    
    /**
     * 获取SD卡文件
     * @param path
     * @return
     */
    public int getSDCardMassage(String path){
             boolean flag = Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED);
             if(flag){
                 if(SDUtil.isExistFiles(path)){
                     File f = new File(path);
                     File[] files = f.listFiles();
                     int size = files.length;
                     fileNames = new String[size];
                     filePaths = new String[size];
                     for(int i = 0; i < size; i++ ){
                         File exitFile = files[i];
                         if(exitFile.exists()){
                             fileNames[i] = exitFile.getName();
                             if(SDUtil.isExistFiles(exitFile.getAbsolutePath()))
                                 filePaths[i] = exitFile.getAbsolutePath();
                             else 
                                 filePaths[i] = null;
                         }
                     }
                     return size;
                 }
             }
             return 0;
         }
}

<?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" >
    <RelativeLayout 
         android:layout_width="fill_parent"
         android:layout_height="wrap_content"
         android:background="@color/search_bg_color"
         >
         <EditText 
                android:id="@+id/entry" 
               android:layout_width="wrap_content" 
            android:layout_height="wrap_content" 
            android:background="@android:drawable/editbox_background" 
            android:width="285dp"
            android:height="35dp"
            android:layout_marginTop="3dp"
            />
        <ImageButton
            android:id="@+id/btn_imageButton" 
            android:layout_width="fill_parent"
             android:layout_height="wrap_content"
             android:text="@string/search_btn"
             android:background="@drawable/search_image2"
             android:layout_alignTop="@id/entry"
            android:layout_toRightOf="@id/entry"
            android:layout_marginTop="3dp"
              />
    </RelativeLayout>
    <ListView 
        android:id="@+id/listleft"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content">
    </ListView>
</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >
    
    <TextView
        android:id="@+id/titleleftlist"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        
         />
    <TextView
        android:id="@+id/infoleftlist"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
         
         />
</LinearLayout>

 界面展示如下：