android简易文件管理器实例(列表式文件目录)

核心代码：

File fatherFile = new File(path);File[] files = fatherFile.listFiles();

效果图：

实现这种列表式的目录，用直接读取目录下文件方法会比较简单，但是如果要根据文件类型从所有文件中分类，那就用ContentProvider去查询数据库方式会更有效率；

实现代码：

FileListActivity.java

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;
}

}

FileEntity.java

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;
}

}

activity_filelist.xml

<?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>

item_listview.xml

<?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>