package com.example.d_readandwritetextfile;

import java.io.File;
import java.util.ArrayList;

import com.example.d_readandwritetextfile.entity.FileEntity;
import com.example.d_readandwritetextfile.entity.FileEntity.Type;

import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.os.Environment;
import android.os.Handler;
import android.os.Message;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

/**
 * 文件列表 界面
 * @author Administrator
 *
 */
public class FileListActivity extends Activity implements OnClickListener{
 
 private ListView mListView;
 private Button btnComfirm;
 private MyFileAdapter mAdapter;
 private Context mContext;
 private File currentFile;
 String sdRootPath;
 
 private ArrayList<FileEntity> mList;
 
 private Handler mHandler;
 
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_filelist);
  mHandler = new Handler(){
   @Override
   public void handleMessage(Message msg) {
    super.handleMessage(msg);
    switch (msg.what) {
    case 1:
     if(mAdapter ==null){
      mAdapter = new MyFileAdapter(mContext, mList);
      mListView.setAdapter(mAdapter);
     }else{
      mAdapter.notifyDataSetChanged();
     }
     
     break;
    case 2:
     
     break;

    default:
     break;
    }
   }
  };
  
  mContext = this;
  mList = new ArrayList<>();
  sdRootPath =Environment.getExternalStorageDirectory().getAbsolutePath();
  currentFile = new File(sdRootPath);
  System.out.println(sdRootPath);
  initView();
  getData(sdRootPath);
  
  
 }
 
 @Override
 public void onBackPressed() {
//  super.onBackPressed();
  System.out.println("onBackPressed...");
  if(sdRootPath.equals(currentFile.getAbsolutePath())){
   System.out.println("已经到了根目录...");
   return ;
  }
  
  String parentPath = currentFile.getParent();
  currentFile = new File(parentPath);
  getData(parentPath);
 }
 
 private void initView() {
  mListView = (ListView) findViewById(R.id.listView1);
  btnComfirm = (Button) findViewById(R.id.button1);
  
  mListView.setOnItemClickListener(new OnItemClickListener() {

   @Override
   public void onItemClick(AdapterView<?> parent, View view,
     int position, long id) {
    final FileEntity entity = mList.get(position);
    if(entity.getFileType() == Type.FLODER){
     currentFile = new File(entity.getFilePath());
     getData(entity.getFilePath());
    }else if(entity.getFileType() == Type.FILE){
     
     runOnUiThread(new Runnable() {
      
      @Override
      public void run() {
       Toast.makeText(mContext, entity.getFilePath()+" "+entity.getFileName(),
         1).show();
      }
     });
    }
    
   }
  });
 }
 
 private void getData(final String path) {
  new Thread(){
   @Override
   public void run() {
    super.run();
    
    findAllFiles(path);
   }
  }.start();

 }

 @Override
 public void onClick(View v) {
  switch (v.getId()) {
  case R.id.button1:
   setResult(100);
   finish();
   break;

  default:
   break;
  }
  
 }
 
 /**
  * 查找path地址下所有文件
  * @param path
  */
 public void findAllFiles(String path) {
  mList.clear();
  
  if(path ==null ||path.equals("")){
   return;
  }
  File fatherFile = new File(path);
  File[] files = fatherFile.listFiles();
  if (files != null && files.length > 0) {
   for (int i = 0; i < files.length; i++) {
    FileEntity entity = new FileEntity();
    boolean isDirectory = files[i].isDirectory();
    if(isDirectory ==true){
     entity.setFileType(Type.FLODER);
//     entity.setFileName(files[i].getPath());
    }else{
     entity.setFileType(Type.FILE);
    }
    entity.setFileName(files[i].getName().toString());
    entity.setFilePath(files[i].getAbsolutePath());
    entity.setFileSize(files[i].length()+"");
    mList.add(entity);
   }
  }
  mHandler.sendEmptyMessage(1);
  
 }
 
 
 class MyFileAdapter extends BaseAdapter {
  private Context mContext;
  private ArrayList<FileEntity> mAList;
  private LayoutInflater mInflater;
  
  

  public MyFileAdapter(Context mContext, ArrayList<FileEntity> mList) {
   super();
   this.mContext = mContext;
   this.mAList = mList;
   mInflater = LayoutInflater.from(mContext);
  }

  @Override
  public int getCount() {
   // TODO Auto-generated method stub
   return mAList.size();
  }

  @Override
  public Object getItem(int position) {
   // TODO Auto-generated method stub
   return mAList.get(position);
  }

  @Override
  public long getItemId(int position) {
   return position;
  }

  @Override
  public int getItemViewType(int position) {
   if(mAList.get(position).getFileType() == Type.FLODER){
    return 0;
   }else{
    return 1;
   }
  }
  
  @Override
  public int getViewTypeCount() {
   return 2;
  }
  
  @Override
  public View getView(int position, View convertView, ViewGroup parent) {
//   System.out.println("position-->"+position+"  ---convertView--"+convertView);
   ViewHolder holder = null;
   int type = getItemViewType(position);
   FileEntity entity = mAList.get(position);
   
   if(convertView == null){
    holder = new ViewHolder();
    switch (type) {
    case 0://folder
     convertView = mInflater.inflate(R.layout.item_listview, parent, false);
     holder.iv = (ImageView) convertView.findViewById(R.id.item_imageview);
     holder.tv = (TextView) convertView.findViewById(R.id.item_textview);
     break;
    case 1://file
     convertView = mInflater.inflate(R.layout.item_listview, parent, false);
     holder.iv = (ImageView) convertView.findViewById(R.id.item_imageview);
     holder.tv = (TextView) convertView.findViewById(R.id.item_textview);
     
     break;

    default:
     break;
     
    }
    convertView.setTag(holder);
   }else {
    holder = (ViewHolder) convertView.getTag();
   }
   
   switch (type) {
   case 0:
    holder.iv.setImageResource(R.drawable.folder_125);
    holder.tv.setText(entity.getFileName());
    break;
   case 1:
    holder.iv.setImageResource(R.drawable.file);
    holder.tv.setText(entity.getFileName());
    
    break;

   default:
    break;
   }
   
   
   return convertView;
  }
  
 }
 
 class ViewHolder {
  ImageView iv;
  TextView tv;
 }

}

package com.example.d_readandwritetextfile.entity;

public class FileEntity {
 
 public enum Type{
  FLODER,FILE
 }
 private String filePath;
 private String fileName;
 private String fileSize;
 private Type fileType;
 
 
 public String getFilePath() {
  return filePath;
 }
 public void setFilePath(String filePath) {
  this.filePath = filePath;
 }
 public String getFileName() {
  return fileName;
 }
 public void setFileName(String fileName) {
  this.fileName = fileName;
 }
 public String getFileSize() {
  return fileSize;
 }
 public void setFileSize(String fileSize) {
  this.fileSize = fileSize;
 }
 public Type getFileType() {
  return fileType;
 }
 public void setFileType(Type fileType) {
  this.fileType = fileType;
 }
 
 

}

<?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" >

  <RelativeLayout
    android:layout_width="match_parent"
    android:layout_height="60dp" >

    <Button
      android:id="@+id/button1"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_alignParentBottom="true"
      android:layout_alignParentRight="true"
      android:layout_marginRight="14dp"
      android:onClick="onClick"
      android:text="确定" />
    
    <View 
      android:layout_width="match_parent"
      android:layout_height="1dp"
      android:background="#666"
      android:layout_alignParentBottom="true"
      />

  </RelativeLayout>

  <ListView
    android:id="@+id/listView1"
    android:layout_width="match_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="50dp"
  android:orientation="horizontal" >

  <ImageView
    android:id="@+id/item_imageview"
    android:layout_width="50dp"
    android:layout_height="50dp"
    android:layout_marginLeft="10dp"
    android:src="@drawable/folder_125" 
    android:scaleType="fitXY"
    />

  <TextView
    android:id="@+id/item_textview"
    android:layout_width="wrap_content"
    android:layout_height="match_parent"
    android:layout_marginLeft="10dp"
    android:text="TextView"
    android:gravity="center"
     />

</LinearLayout>