版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/I_do_can/article/details/50572807
主要实现的是获取本地文件夹，读取txt和csv文件
apk: http://fir.im/h1qa
我是站在巨人的肩膀上，有前辈已经把获取手机文件的写成一个类，直接调用即可，在此表示感谢
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.text.DecimalFormat;
import java.util.ArrayList;
import java.util.Comparator;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import android.os.Environment;
/**
* 用于获取手机的文件夹及文件的工具类，如果权限允许，可以获取手机上任意路径的文件列表
* GetFilesUtils使用的是懒汉式单例模式，线程安全
*@since 2016/1/19.
*/
public class GetFilesUtils {
public static final String FILE_TYPE_FOLDER="wFl2d";
public static final String FILE_INFO_NAME="fName";
public static final String FILE_INFO_ISFOLDER="fIsDir";
public static final String FILE_INFO_TYPE="fFileType";
public static final String FILE_INFO_NUM_SONDIRS="fSonDirs";
public static final String FILE_INFO_NUM_SONFILES="fSonFiles";
public static final String FILE_INFO_PATH="fPath";
private static GetFilesUtils gfu;
private GetFilesUtils(){
}
/**
* 获取GetFilesUtils实例
* @return GetFilesUtils
**/
public static synchronized GetFilesUtils getInstance(){
if(gfu==null){
gfu=new GetFilesUtils();
}
return gfu;
}
/**
* 获取文件path文件夹下的文件列表
* @see #getSonNode(String)
* @param path 手机上的文件夹
* @return path文件夹下的文件列表的信息，信息存储在Map中，Map的key的列表如下：<br />
* FILE_INFO_NAME : String 文件名称 <br />
* FILE_INFO_ISFOLDER: boolean 是否为文件夹 <br />
* FILE_INFO_TYPE: string 文件的后缀 <br />
* FILE_INFO_NUM_SONDIRS : int 子文件夹个数 <br />
* FILE_INFO_NUM_SONFILES: int 子文件个数 <br />
* FILE_INFO_PATH : String 文件的绝对路径 <br />
**/
public List<Map<String, Object>> getSonNode(File path){
if(path.isDirectory()){
List<Map<String, Object>> list=new ArrayList<Map<String,Object>>();
File[] files=path.listFiles();
if(files!=null){
for(int i=0;i<files.length;i++){
Map<String, Object> fileInfo=new HashMap<String, Object>();
fileInfo.put(FILE_INFO_NAME, files[i].getName());
if(files[i].isDirectory()){
fileInfo.put(FILE_INFO_ISFOLDER, true);
File[] bFiles=files[i].listFiles();
if(bFiles==null){
fileInfo.put(FILE_INFO_NUM_SONDIRS, 0);
fileInfo.put(FILE_INFO_NUM_SONFILES, 0);
}else{
int getNumOfDir=0;
for(int j=0;j<bFiles.length;j++){
if(bFiles[j].isDirectory()){
getNumOfDir++;
}
}
fileInfo.put(FILE_INFO_NUM_SONDIRS, getNumOfDir);
fileInfo.put(FILE_INFO_NUM_SONFILES, bFiles.length-getNumOfDir);
}
fileInfo.put(FILE_INFO_TYPE, FILE_TYPE_FOLDER);
}else{
fileInfo.put(FILE_INFO_ISFOLDER, false);
fileInfo.put(FILE_INFO_NUM_SONDIRS, 0);
fileInfo.put(FILE_INFO_NUM_SONFILES, 0);
fileInfo.put(FILE_INFO_TYPE, getFileType(files[i].getName()));
}
fileInfo.put(FILE_INFO_PATH, files[i].getAbsoluteFile());
list.add(fileInfo);
}
return list;
}else{
return null;
}
}else{
return null;
}
}
/**
* 获取文件pathStr文件夹下的文件列表
* @see #getSonNode(File)
* @param pathStr 手机上的文件夹的绝对路径
* @return pathStr文件夹下的文件列表的信息，信息存储在Map中，Map的key的列表如下：<br />
* FILE_INFO_NAME : String 文件名称 <br />
* FILE_INFO_ISFOLDER: boolean 是否为文件夹 <br />
* FILE_INFO_TYPE: string 文件的后缀 <br />
* FILE_INFO_NUM_SONDIRS : int 子文件夹个数 <br />
* FILE_INFO_NUM_SONFILES: int 子文件个数 <br />
* FILE_INFO_PATH : String 文件的绝对路径 <br />
**/
public List<Map<String, Object>> getSonNode(String pathStr){
File path=new File(pathStr);
return getSonNode(path);
}
/**
* 获取文件path文件或文件夹的兄弟节点文件列表
* @see #getBrotherNode(String)
* @param path 手机上的文件夹
* @return path文件夹下的文件列表的信息，信息存储在Map中，Map的key的列表如下：<br />
* FILE_INFO_NAME : String 文件名称 <br />
* FILE_INFO_ISFOLDER: boolean 是否为文件夹 <br />
* FILE_INFO_TYPE: string 文件的后缀 <br />
* FILE_INFO_NUM_SONDIRS : int 子文件夹个数 <br />
* FILE_INFO_NUM_SONFILES: int 子文件个数 <br />
* FILE_INFO_PATH : String 文件的绝对路径 <br />
**/
public List<Map<String, Object>> getBrotherNode(File path){
if(path.getParentFile()!=null){
return getSonNode(path.getParentFile());
}else{
return null;
}
}
/**
* 获取文件path文件或文件夹的兄弟节点文件列表
* @see #getBrotherNode(File)
* @param path 手机上的文件夹
* @return path文件夹下的文件列表的信息，信息存储在Map中，Map的key的列表如下：<br />
* FILE_INFO_NAME : String 文件名称 <br />
* FILE_INFO_ISFOLDER: boolean 是否为文件夹 <br />
* FILE_INFO_TYPE: string 文件的后缀 <br />
* FILE_INFO_NUM_SONDIRS : int 子文件夹个数 <br />
* FILE_INFO_NUM_SONFILES: int 子文件个数 <br />
* FILE_INFO_PATH : String 文件的绝对路径 <br />
**/
public List<Map<String, Object>> getBrotherNode(String pathStr){
File path=new File(pathStr);
return getBrotherNode(path);
}
/**
* 获取文件或文件夹的父路径
* @param File path文件或者文件夹
* @return String path的父路径
**/
public String getParentPath(File path){
if(path.getParentFile()==null){
return null;
}else{
return path.getParent();
}
}
/**
* 获取文件或文件的父路径
* @param String pathStr文件或者文件夹路径
* @return String pathStr的父路径
**/
public String getParentPath(String pathStr){
File path=new File(pathStr);
if(path.getParentFile()==null){
return null;
}else{
return path.getParent();
}
}
/**
* 获取sd卡的绝对路径
* @return String 如果sd卡存在，返回sd卡的绝对路径，否则返回null
**/
public String getSDPath(){
String sdcard=Environment.getExternalStorageState();
if(sdcard.equals(Environment.MEDIA_MOUNTED)){
return Environment.getExternalStorageDirectory().getAbsolutePath();
}else{
return null;
}
}
/**
* 获取一个基本的路径，一般应用创建存放应用数据可以用到
* @return String 如果SD卡存在，返回SD卡的绝对路径，如果SD卡不存在，返回Android数据目录的绝对路径
**/
public String getBasePath(){
String basePath=getSDPath();
if(basePath==null){
return Environment.getDataDirectory().getAbsolutePath();
}else{
return basePath;
}
}
/**
* 获取文件path的大小
* @return String path的大小
**/
public String getFileSize(File path) throws IOException{
if(path.exists()){
DecimalFormat df = new DecimalFormat("#.00");
String sizeStr="";
FileInputStream fis=new FileInputStream(path);
long size=fis.available();
fis.close();
if(size<1024){
sizeStr=size+"B";
}else if(size<1048576){
sizeStr=df.format(size/(double)1024)+"KB";
}else if(size<1073741824){
sizeStr=df.format(size/(double)1048576)+"MB";
}else{
sizeStr=df.format(size/(double)1073741824)+"GB";
}
return sizeStr;
}else{
return null;
}
}
/**
* 获取文件fpath的大小
* @return String path的大小
**/
public String getFileSize(String fpath){
File path=new File(fpath);
if(path.exists()){
DecimalFormat df = new DecimalFormat("#.00");
String sizeStr="";
long size=0;
try {
FileInputStream fis = new FileInputStream(path);
size=fis.available();
fis.close();
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
return "未知大小";
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
return "未知大小";
}
if(size<1024){
sizeStr=size+"B";
}else if(size<1048576){
sizeStr=df.format(size/(double)1024)+"KB";
}else if(size<1073741824){
sizeStr=df.format(size/(double)1048576)+"MB";
}else{
sizeStr=df.format(size/(double)1073741824)+"GB";
}
return sizeStr;
}else{
return "未知大小";
}
}
/**
* 根据后缀获取文件fileName的类型
* @return String 文件的类型
**/
public String getFileType(String fileName){
if(fileName!=""&&fileName.length()>3){
int dot=fileName.lastIndexOf(".");
if(dot>0){
return fileName.substring(dot+1);
}else{
return "";
}
}
return "";
}
public Comparator<Map<String, Object>> defaultOrder() {
final String orderBy0=FILE_INFO_ISFOLDER;
final String orderBy1=FILE_INFO_TYPE;
final String orderBy2=FILE_INFO_NAME;
Comparator<Map<String, Object>> order=new Comparator<Map<String,Object>>() {
@Override
public int compare(Map<String, Object> lhs, Map<String, Object> rhs) {
// TODO Auto-generated method stub
int left0=lhs.get(orderBy0).equals(true)?0:1;
int right0=rhs.get(orderBy0).equals(true)?0:1;
if(left0==right0){
String left1=lhs.get(orderBy1).toString();
String right1=rhs.get(orderBy1).toString();
if(left1.compareTo(right1)==0){
String left2=lhs.get(orderBy2).toString();
String right2=rhs.get(orderBy2).toString();
return left2.compareTo(right2);
}else{
return left1.compareTo(right1);
}
}else{
return left0-right0;
}
}
};
return order;
}
}
由于功能简单，回调的方法就写了一个（就是java里的接口）
public interface FragmentCallBack {
void showContent( StringBuffer sb);
}
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.support.v7.app.AppCompatActivity;
import android.view.KeyEvent;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.AdapterView;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.TextView;
import android.widget.Toast;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Timer;
import java.util.TimerTask;
public class MainActivity extends AppCompatActivity implements FragmentCallBack{
private ListView folderLv;
//当前文件路径
private TextView foldernowTv;
private static List<Map<String, Object>> aList;
private String baseFile;
private SimpleAdapter sAdapter;
private static MessageFragment messageFragment;
private static FloderFragment floderFragment;
//当前frame退出时判断使用
private static Fragment currentFragment;
private FragmentManager fragmentManager;
private static FragmentTransaction fragmentTransaction;
private static boolean isExit = false;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.content_main);
/*FragmentManager*/
fragmentManager = getSupportFragmentManager();
messageFragment = new MessageFragment();
floderFragment =new FloderFragment();
fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.setCustomAnimations(android.R.anim.fade_in, android.R.anim.fade_out);
//由于当前的是activity，替换后，activity里的数据还是存在的，显示很乱，不是不可以把当前类换成frame
fragmentTransaction.replace(R.id.relativelayout,floderFragment);//将fragment设置到布局上
currentFragment = floderFragment;
fragmentTransaction.addToBackStack(null);
fragmentTransaction.commitAllowingStateLoss();
}
/*回调使用 */
public void showContent( StringBuffer sb){
Bundle data = new Bundle();
data.putString("TEXT", sb.toString());
messageFragment.setArguments(data);//通过Bundle向Activity中传递值
//由于当前的是activity，替换后，activity里的数据还是存在的，显示很乱，不是不可以把当前类换成frame
/*这里要新建一个fragmentTransaction，要不会回调出错*/
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.setCustomAnimations(android.R.anim.fade_in, android.R.anim.fade_out);
fragmentTransaction.replace(R.id.relativelayout, messageFragment);//将fragment设置到布局上
currentFragment = messageFragment;
// 加入回退栈就可以实现按返回键退回到上一个fragment界面
fragmentTransaction.addToBackStack(null);
fragmentTransaction.commitAllowingStateLoss();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
private void exit() {
if(!isExit) {
isExit = true;
Toast.makeText(this, "再按一次退出程序", Toast.LENGTH_SHORT).show();
new Timer().schedule(new TimerTask() {
@Override
public void run() {
isExit = false;
}
}, 2000);
} else {
finish();
}
}
//监听返回键,2s内按两次退出
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_BACK
&& event.getRepeatCount() == 0) {
//当前是文件读取界面
if(currentFragment == messageFragment){
currentFragment = floderFragment;
////退回 文件夹 界面，不过界面是初始化时的样子,下面这两种方式一样的效果
getSupportFragmentManager().popBackStack();
// return super.onKeyDown(keyCode, event);
}else {
exit();
}
}
return false;
}
}
private void exit() {
if(!isExit) {
isExit = true;
Toast.makeText(this, "再按一次退出程序", Toast.LENGTH_SHORT).show();
new Timer().schedule(new TimerTask() {
@Override
public void run() {
isExit = false;
}
}, 2000);
} else {
finish();
}
}mainactivity布局
<RelativeLayout 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/textview_title"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:gravity="center"
android:singleLine="true"
android:text="文件列表"
android:textColor="#0A0A0A"
android:textSize="50sp"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true" />
<View
android:layout_width="wrap_content"
android:layout_height="1dp"
android:background="@drawable/single_line"
android:layout_below="@+id/textview_title"
android:layout_alignParentLeft="true"
android:id="@+id/view3" />
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:id="@+id/relativelayout"
android:layout_alignTop="@+id/view3"></RelativeLayout>
</RelativeLayout><?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">
<TextView android:layout_width="match_parent"
android:layout_height="40dp"
android:textColor="#0A0A0A"
android:textSize="16sp"
android:gravity="center_vertical"
android:ellipsize="start"
android:singleLine="true"
android:drawableLeft="@drawable/go_back"
android:paddingLeft="10dp"
android:drawablePadding="10dp"
android:id="@+id/folder_now"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true" />
<View
android:layout_width="wrap_content"
android:layout_height="1dp"
android:background="@drawable/single_line"
android:id="@+id/view2"
android:layout_below="@+id/folder_now"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true" />
<ListView
android:id="@+id/listview"
android:layout_width="match_parent"
android:layout_height="110dp"
android:layout_weight="6"
android:divider="#ff111111"
android:dividerHeight="2dp"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_alignParentBottom="true"
android:layout_below="@+id/view2" />
</RelativeLayout>
<?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"
android:orientation="vertical"
android:weightSum="1">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:id="@+id/folder_name"
android:layout_gravity="center_horizontal"
android:textColor="#0A0A0A"
android:text="#0A0A0A"
android:layout_marginLeft="66dp"
android:layout_marginStart="66dp"
android:layout_marginTop="25dp"
android:layout_alignParentTop="true"
android:layout_toRightOf="@+id/folder_img"
android:layout_toEndOf="@+id/folder_img" />
<ImageView
android:layout_width="105dp"
android:layout_height="105dp"
android:id="@+id/folder_img"
android:layout_alignTop="@+id/folder_name"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceSmall"
android:id="@+id/folder_info"
android:textColor="#0A0A0A"
android:text="#0A0A0A"
android:layout_alignBottom="@+id/folder_img"
android:layout_alignLeft="@+id/folder_name"
android:layout_alignStart="@+id/folder_name" />
</RelativeLayout>读取文件的布局，数据显示在TextView里
<?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">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="文件内容"
android:textColor="#000"
android:textSize="60px"
android:id="@+id/textView"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true" />
<View
android:layout_width="wrap_content"
android:layout_height="1dp"
android:background="@drawable/single_line"
android:layout_below="@+id/textView"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:id="@+id/view" />
<TextView
android:layout_width="600px"
android:layout_height="wrap_content"
android:text="New Text"
android:id="@+id/message"
android:textColor="#000"
android:textSize="50px"
android:maxLines="16"
android:scrollbars="vertical"
android:singleLine="false"
android:layout_below="@+id/view"
android:layout_centerHorizontal="true"
android:layout_marginTop="34dp" />
</RelativeLayout>
public class MessageFragment extends Fragment {
private TextView textView;
public MessageFragment() {
// Required empty public constructor
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.content_message, container, false);
textView = (TextView)view.findViewById(R.id.message);
/*TextView自滚动（垂直）*/
textView.setMovementMethod(ScrollingMovementMethod.getInstance()) ;
//获取数据
Bundle data = getArguments();//获得从activity中传递过来的值
textView.setText(data.getString("TEXT"));
return view ;
}
}
import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.TextView;
import android.widget.Toast;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
/**
* Created by Administrator on 2016/1/20.
*/
public class FloderFragment extends Fragment {
private ListView folderLv;
//当前文件路径
private TextView foldernowTv;
private static List<Map<String, Object>> aList;
private String baseFile;
private SimpleAdapter sAdapter;
private static FragmentCallBack fragmentCallBack = null;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.content_floder, container, false);
/*ListView*/
folderLv = (ListView) view.findViewById(R.id.listview);
aList=new ArrayList<Map<String,Object>>();
sAdapter=new SimpleAdapter(getContext(), aList,R.layout.listitem_folder, new String[]{"fImg","fName","fInfo"},
new int[]{R.id.folder_img,R.id.folder_name,R.id.folder_info});
folderLv.setAdapter(sAdapter);
folderLv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
if(aList.get(position).get("fIsDir").equals(true)){
try {
loadFolderList(aList.get(position).get("fPath").toString());
} catch (IOException e) {
e.printStackTrace();
}
}else{//打开文件之前判断一下
if(aList.get(position).get("fImg").equals(R.drawable.filetype_unknow)){
final int positi = position;
new AlertDialog.Builder(getContext())
.setTitle("前方高能预警，强烈建议停止读取，确定要读取?")
.setPositiveButton("确定", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
readTxtFile(aList.get(positi).get("fPath").toString());
return;
}
})
.setNegativeButton("取消", null)
.show();
}else {
readTxtFile(aList.get(position).get("fPath").toString());
}
}
}
});
baseFile=GetFilesUtils.getInstance().getBasePath();
foldernowTv=(TextView)view.findViewById(R.id.folder_now);
foldernowTv.setText(baseFile);
foldernowTv.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
try {
String folder = GetFilesUtils.getInstance().getParentPath(foldernowTv.getText().toString());
if (folder == null) {
Toast.makeText(getContext(), "无父目录", Toast.LENGTH_SHORT).show();
} else {
loadFolderList(folder);
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
});
return view ;
}
private void loadFolderList(String file) throws IOException{
List<Map<String, Object>> list=GetFilesUtils.getInstance().getSonNode(file);
if(list!=null){
Collections.sort(list, GetFilesUtils.getInstance().defaultOrder());
aList.clear();
for(Map<String, Object> map:list){
String fileType=(String) map.get(GetFilesUtils.FILE_INFO_TYPE);
Map<String,Object> gMap=new HashMap<String, Object>();
if(map.get(GetFilesUtils.FILE_INFO_ISFOLDER).equals(true)){
gMap.put("fIsDir", true);
gMap.put("fImg",R.drawable.filetype_folder );
gMap.put("fInfo", map.get(GetFilesUtils.FILE_INFO_NUM_SONDIRS)+"个文件夹和"+
map.get(GetFilesUtils.FILE_INFO_NUM_SONFILES)+"个文件");
}else{
gMap.put("fIsDir", false);
if(fileType.equals("txt")||fileType.equals("text")||fileType.equals("csv")){
gMap.put("fImg", R.drawable.filetype_text);
}else{
gMap.put("fImg", R.drawable.filetype_unknow);
}
gMap.put("fInfo","文件大小:"+GetFilesUtils.getInstance().getFileSize(map.get(GetFilesUtils.FILE_INFO_PATH).toString()));
}
gMap.put("fName", map.get(GetFilesUtils.FILE_INFO_NAME));
gMap.put("fPath", map.get(GetFilesUtils.FILE_INFO_PATH));
aList.add(gMap);
}
}else{
aList.clear();
}
sAdapter.notifyDataSetChanged();
foldernowTv.setText(file);
}
/**
* 功能：Java读取txt文件的内容
* 步骤：1：先获得文件句柄
* 2：获得文件句柄当做是输入一个字节码流，需要对这个输入流进行读取
* 3：读取到输入流后，需要读取生成字节流
* 4：一行一行的输出。readline()。
* 备注：需要考虑的是异常情况
* @param filePath
*/
public static void readTxtFile(String filePath) {
try {
String encoding = "GBK";
StringBuffer sb = new StringBuffer();
File file = new File(filePath);
if (file.isFile() && file.exists()) { //判断文件是否存在
InputStreamReader read = new InputStreamReader(
new FileInputStream(file), encoding);//考虑到编码格式
BufferedReader bufferedReader = new BufferedReader(read);
String lineTxt = null;
while ((lineTxt = bufferedReader.readLine()) != null) {
sb.append(lineTxt);
// System.out.println(lineTxt);
}
//传数据到messagefragment
//1 直接调用Activity中的方法 ,找不到，不知为何，可能不支持了吧
//2 回调
fragmentCallBack.showContent(sb);
read.close();
}
} catch (Exception e) {
e.printStackTrace();
}
}
/**2 回调需要重写*/
@Override
public void onAttach(Activity activity) {
// TODO Auto-generated method stub
super.onAttach(activity);
fragmentCallBack = (MainActivity)activity;
}
}
代码的流程是：当要读取文件内容时，使用回调函数，去显示文件信息