1、前言：
在開發的過程中有時候我們會遇到對檔案的操作：查找、讀取、顯示、管理等。下面對其做詳細的說明：今天完成了記錄下，友善自己以後看，也可以幫助有需要的朋友們。
2、效果圖
圖 1
圖 2
圖 3
圖 4
圖 5
3、源代碼
3.1 XML檔案
3.1.1 file_row.xml
<?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:background="#ffffff"
android:orientation="horizontal" >
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="horizontal"
android:padding="6px" >
<ImageView
android:id="@+id/icon"
android:layout_width="40dip"
android:layout_height="40dip" >
</ImageView>
<TextView
android:id="@+id/text"
android:layout_width="fill_parent"
android:layout_height="40dip"
android:layout_marginLeft="10dp"
android:gravity="center|left" >
</TextView>
</LinearLayout>
</LinearLayout>
3.1.2 fileselect.xml
<?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:padding="5dip" >
<!-- -->
<TextView
android:id="@+id/mPath"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="5dp"
android:padding="5dp"
android:textSize="18sp" />
<ListView
android:id="@android:id/list"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="@drawable/background_shape" >
</ListView>
</LinearLayout>
4 、Java代碼
4.1、MyAdapter.java
package com.example.fileexample;
import java.io.File;
import java.util.List;
import android.annotation.SuppressLint;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;
public class MyAdapter extends BaseAdapter {
private String TAG = "MyAdapter";
private LayoutInflater mInflater;
private Bitmap mIcon1;
private Bitmap mIcon2;
private Bitmap mIcon3;
private Bitmap mIcon4;
private Bitmap mIcon5;
private Bitmap mIcon6;
private Bitmap mIcon7;
private Bitmap mIcon8;
private Bitmap mIcon9;
private Bitmap mIcon10;
private Bitmap mIcon11;
private Bitmap mIcon12;
private Bitmap mIcon13;
private Bitmap mIcon14;
private List<String> items;
private List<String> paths;
public MyAdapter(Context context, List<String> it, List<String> pa)
{
mInflater = LayoutInflater.from(context);
items = it;
paths = pa;
mIcon1 = BitmapFactory.decodeResource(context.getResources(),
R.drawable.iconfont_backroot);
mIcon2 = BitmapFactory.decodeResource(context.getResources(),
R.drawable.iconfont_backup);
mIcon3 = BitmapFactory.decodeResource(context.getResources(),
R.drawable.iconfont_folderc);
mIcon4 = BitmapFactory.decodeResource(context.getResources(),
R.drawable.iconfont_txt);
mIcon5 = BitmapFactory.decodeResource(context.getResources(),
R.drawable.iconfont_doc);
mIcon6 = BitmapFactory.decodeResource(context.getResources(),
R.drawable.iconfont_html);
mIcon7 = BitmapFactory.decodeResource(context.getResources(),
R.drawable.iconfont_c);
mIcon8 = BitmapFactory.decodeResource(context.getResources(),
R.drawable.iconfont_pdf);
mIcon9 = BitmapFactory.decodeResource(context.getResources(),
R.drawable.iconfont_zip);
mIcon10 = BitmapFactory.decodeResource(context.getResources(),
R.drawable.iconfont_photos);
mIcon11 = BitmapFactory.decodeResource(context.getResources(),
R.drawable.iconfont_mp3);
mIcon12 = BitmapFactory.decodeResource(context.getResources(),
R.drawable.iconfont_mp4);
mIcon13 = BitmapFactory.decodeResource(context.getResources(),
R.drawable.iconfont_apk);
mIcon14 = BitmapFactory.decodeResource(context.getResources(),
R.drawable.iconfont_other);
}
public int getCount()
{
return items.size();
}
public Object getItem(int position)
{
return items.get(position);
}
public long getItemId(int position)
{
return position;
}
public View getView(int position, View convertView, ViewGroup parent)
{
ViewHolder holder;
if (convertView == null)
{
convertView = mInflater.inflate(R.layout.file_row, null);
holder = new ViewHolder();
holder.text = (TextView) convertView.findViewById(R.id.text);
holder.icon = (ImageView) convertView.findViewById(R.id.icon);
convertView.setTag(holder);
} else
{
holder = (ViewHolder) convertView.getTag();
}
File f = new File(paths.get(position).toString());
MyFileManager file = new MyFileManager();
if (items.get(position).toString().equals("b1"))
{
holder.text.setText("傳回根目錄..");
holder.icon.setImageBitmap(mIcon1);
}
else if (items.get(position).toString().equals("b2"))
{
holder.text.setText("傳回上一層..");
holder.icon.setImageBitmap(mIcon2);
}
else
{
holder.text.setText(f.getName());
String type = checkShapeFile(f);
if (f.isDirectory()) {
holder.icon.setImageBitmap(mIcon3);
}
else if (checkFileIsMyNeedType(type)) {
if (type.equals("txt")) {
Log.d(TAG, "now type..txt." + type);
holder.icon.setImageBitmap(mIcon4);
}
if (type.equals("doc") || type.equals("wps")) {
Log.d(TAG, "now type..doc." + type);
holder.icon.setImageBitmap(mIcon5);
}
if (type.equals("html") || (type.equals("xml"))) {
Log.d(TAG, "now type..html." + type);
holder.icon.setImageBitmap(mIcon6);
}
if (type.equals("c")) {
Log.d(TAG, "now type..c." + type);
holder.icon.setImageBitmap(mIcon7);
}
if (type.equals("pdf")) {
Log.d(TAG, "now type..pdf." + type);
holder.icon.setImageBitmap(mIcon8);
}
if (type.equals("zip") || type.equals("rar")) {
Log.d(TAG, "now type..zip." + type);
holder.icon.setImageBitmap(mIcon9);
}
if (type.equals("jpg") || (type.equals("png"))
|| (type.equals("jpeg")) || (type.equals("bmp"))) {
Log.d(TAG, "now type..jpg." + type);
holder.icon.setImageBitmap(mIcon10);
}
if (type.equals("mp3")) {
Log.d(TAG, "now type..mp3." + type);
holder.icon.setImageBitmap(mIcon11);
}
if (type.equals("mp4") || type.equals("wav")
|| type.equals("swf")) {
Log.d(TAG, "now type..mp4." + type);
holder.icon.setImageBitmap(mIcon12);
}
if (type.equals("exe") || type.equals("apk")) {
Log.d(TAG, "now type..exe." + type);
holder.icon.setImageBitmap(mIcon13);
}
} else {
Log.d(TAG, "now type..pdf.last");
holder.icon.setImageBitmap(mIcon14);
}
}
return convertView;
}
private class ViewHolder
{
TextView text;
ImageView icon;
}
public String checkShapeFile(File file) {
String fileNameString = file.getName();
String endNameString = fileNameString.substring(
fileNameString.lastIndexOf(".") + 1, fileNameString.length())
.toLowerCase();
return endNameString;
}
public boolean checkFileIsMyNeedType(String strtype) {
boolean flags = false;
for (int i = 0; i < MyFileManager.FILESTYPE_CONTENTS.length; i++) {
if (strtype.equals(MyFileManager.FILESTYPE_CONTENTS[i])) {
flags = true;
break;
} else {
flags = false;
}
}
return flags;
}
}
4.2、MyFileManage.java
package com.example.fileexample;
import java.io.File;
import java.util.ArrayList;
import java.util.List;
import android.app.ListActivity;
import android.content.Intent;
import android.os.Bundle;
import android.os.Environment;
import android.util.Log;
import android.view.View;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
public class MyFileManager extends ListActivity {
private String TAG = "MyFileManager";
private List<String> items = null;
private List<String> paths = null;
public static final int FILE_RESULT_BACKCODE = 1;
public static boolean IS_DIRECTORY = false;
public static boolean IS_FILE = false;
// 動态初始化...
public static String FILE_TYPE[] = new String[200];
public static final String FILESTYPE_CONTENTS[] = { "txt", "doc", "wps",
"html", "xml", "pdf", "zip", "rar", "bmp", "jpg", "png", "jpeg",
"wav", "mp3", "mp4", "avi", "mov", "swf", "exe", "c", "asm", "lib",
"bak", "dot", "bat" };
private String rootPath = getSDDir();
private String curPath = getSDDir();
private TextView mPath;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.fileselect);
mPath = (TextView) findViewById(R.id.mPath);
getFileDir(rootPath);
}
private void getFileDir(String filePath) {
mPath.setText(filePath);
items = new ArrayList<String>();
paths = new ArrayList<String>();
File f = new File(filePath);
File[] files = f.listFiles();
if (!filePath.equals(rootPath)) {
items.add("b1");
paths.add(rootPath);
items.add("b2");
paths.add(f.getParent());
}
for (int i = 0, j = 0; i < files.length; i++) {
File file = files[i];
String type = checkShapeFile(file).toString();
Log.d(TAG, "now type.." + i + ".." + type);
if (type != "isDirectory") {
FILE_TYPE[j] = type;
Log.d(TAG, "FILE_TYPE[ " + j + " ]" + FILE_TYPE[j]);
j++;
}
if (IS_DIRECTORY || IS_FILE) {
items.add(file.getName());
paths.add(file.getPath());
}
}
setListAdapter(new MyAdapter(this, items, paths));
}
// open allocate file
// 獲得選擇檔案的目錄，并用bundle打包，傳遞
@Override
protected void onListItemClick(ListView l, View v, int position, long id) {
File file = new File(paths.get(position));
if (file.isDirectory()) {
curPath = paths.get(position);
Log.d(TAG, "curpath...." + curPath);
getFileDir(paths.get(position));
} else {
Intent data = new Intent(MyFileManager.this,
MainActivity.class);
Bundle bundle = new Bundle();
bundle.putString("file", file.getPath());
data.putExtras(bundle);
setResult(2, data);
finish();
}
}
public String checkShapeFile(File file) {
String fileNameString = file.getName();
String endNameString = fileNameString.substring(
fileNameString.lastIndexOf(".") + 1, fileNameString.length())
.toLowerCase();
if (file.isDirectory()) {
} else if (file.isFile()) {
Log.d(TAG, "endnamestring....." + endNameString);
}
// file is directory or not
if (file.isDirectory()) {
IS_DIRECTORY = true;
endNameString = "isDirectory";
Log.d(TAG, " now endnamestring....." + endNameString);
return endNameString;
}
if (file.isFile()) {
for (int i = 0; i < FILESTYPE_CONTENTS.length; i++) {
if (endNameString.equals(FILESTYPE_CONTENTS[i])) {
IS_FILE = true;
break;
} else {
IS_FILE = false;
}
Log.d(TAG, " file endnamestring....." + endNameString);
}
} else {
IS_FILE = false;
Log.d(TAG, "nxjdvndjvnkdf");
return "";
}
return endNameString;
}
protected final String getSDDir() {
if (!checkSDcard()) {
Toast.makeText(this, "no sdcard", Toast.LENGTH_SHORT).show();
return "";
}
try {
String SD_DIR = Environment.getExternalStorageDirectory()
.getAbsolutePath()
.toString();
// String sdpath=Context.getExternalCacheDir().toString();
Log.d(TAG, "Environment.getExternalStorageDirectory()" + SD_DIR);
return SD_DIR;
} catch (Exception e) {
return "";
}
}
public boolean checkSDcard() {
String sdStutusString = Environment.getExternalStorageState();
if (sdStutusString.equals(Environment.MEDIA_MOUNTED)) {
return true;
} else {
return false;
}
}
}
4.3、MainActivity.java
package com.example.fileexample;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.Menu;
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Intent intent=new Intent();
intent.setClass(MainActivity.this, MyFileManager.class);
startActivity(intent);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
ok，完成了，其實很簡單，記錄下，整個源代碼可以在我的資源中下載下傳。
**下載下傳代碼**
http://download.csdn.net/detail/qwqwqw1214/8208619