android文件管理代码,Java代码库,德仔网

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【Java】 android文件管理
作者:舞维天下 / 发布于2013/7/19/ 933

	package com.Syl.filemanager;

	import java.io.File;
	import java.util.ArrayList;
	import java.util.Currency;
	import java.util.HashMap;
	import java.util.List;
	import android.net.Uri;
	import android.os.Bundle;
	import android.os.Environment;
	import android.annotation.SuppressLint;
	import android.app.Activity;
	import android.app.AlertDialog;
	import android.content.DialogInterface;
	import android.content.Intent;
	import android.view.KeyEvent;
	import android.view.View;
	import android.widget.AdapterView;
	import android.widget.ListView;
	import android.widget.SimpleAdapter;
	import android.widget.TextView;
	import android.widget.Toast;
	import android.widget.AdapterView.OnItemClickListener;

	@SuppressLint("NewApi")
	public class MainActivity extends Activity {
	
	private List<String> paths=null;
	private String rootPath="/";
	private TextView path;
	private ListView lv;
	private String backPath = "";
	private long firstTime = 0;
	
	@Override
	protected void onCreate(Bundle savedInstanceState) {
	 super.onCreate(savedInstanceState);
	
	 /* 设定Layout activity_main.xml*/
	 if (isSDAvailable ()) {
	 setContentView(R.layout.activity_main);
	 path = (TextView)findViewById(R.id.filePath);
	 lv = (ListView)findViewById(R.id.list);
	 backPath = getSDPath();
	
	 rootPath = getSDPath();
	 getFileDir(rootPath);
	 } else {
	 setContentView(R.layout.no_sd);
	 }
	
	}
	
	private void getFileDir(String filePath) {
	 path.setText(filePath);
	
	 backPath = filePath;
	 System.out.println("filePath:"+filePath);
	
	 paths = new ArrayList<String>();
	 File f = new File(filePath);
	 File[] files=f.listFiles();
	
	 if (files == null) {
	 return;
	 }
	
	 ArrayList<HashMap<String, Object>> file_list = new ArrayList<HashMap<String,Object>>();
	 if(!filePath.equals(rootPath))
	 {
	 for (int i = 0; i < 2; i++) {
	 if (i == 0) {
	 HashMap<String, Object> map = new HashMap<String, Object>();
	 map.put("list_image", null);
	 map.put("list_text", getString(R.string.back_to) + rootPath);
	 file_list.add(map);
	 paths.add(rootPath);
	 }
	 else {
	 HashMap<String, Object> map = new HashMap<String, Object>();
	 map.put("list_image", null);
	 map.put("list_text", getString(R.string.back_to_parent));
	 file_list.add(map);
	 paths.add(f.getParent());
	 }
	 }
	 }
	
	 //将文件放入ArrayList數组中
	 for (int i = 0; i < files.length; i++) {
	 HashMap<String, Object> map = new HashMap<String, Object>();
	 File file=files[i];
	 if (file.canRead()) {
	 if (file.isDirectory()) {
	 map.put("list_image", R.drawable.fileicon);
	 }else {
	 //不同文件类型设置不同icon
	 String end=file.getName().substring(file.getName().lastIndexOf(".")
	 +1,file.getName().length()).toLowerCase();
	 if (end.equals("jpg")||end.equals("gif")||end.equals("png")||
	 end.equals("jpeg")||end.equals("bmp")) {
	 map.put("list_image", R.drawable.pic);
	 }else if (end.equals("mp3")||end.equals("mid")||end.equals("wav")) {
	 map.put("list_image", R.drawable.myfiles_file_mp3_b);
	 }else if (end.equals("3gp")||end.equals("mp4")||end.equals("rmvb")) {
	 map.put("list_image", R.drawable.myfiles_icon_video);
	 }else if (end.equals("apk")) {
	 map.put("list_image", R.drawable.myfiles_file_apk_b);
	 }else if (end.equals("txt")||end.equals("c")||end.equals("java")||end.equals("xml")||
	 end.equals("cpp")) {
	 map.put("list_image", R.drawable.myfiles_file_txt);
	 }else {
	 map.put("list_image", R.drawable.other_file);
	 }
	 }
	 }else{
	 map.put("list_image", R.drawable.other_file);
	 }
	 map.put("list_text", file.getName());
	 file_list.add(map);
	 paths.add(file.getPath());
	 }
	 SimpleAdapter listItemAdapter = new SimpleAdapter(this, file_list, R.layout.file_item,
	 new String[] {"list_image", "list_text"},
	 new int[] {R.id.imageItem,R.id.textItem});
	
	 lv.setAdapter(listItemAdapter);
	 lv.setOnItemClickListener(new OnFileManagerItemClickListener());
	}
	
	@Override
	public boolean onKeyUp(int keyCode, KeyEvent event) {
	 // TODO Auto-generated method stub
	 if (isSDAvailable ()) {
	 long secTime = System.currentTimeMillis();
	 System.out.println("getSDPath():"+getSDPath());
	 System.out.println("backPath:"+backPath);
	 System.out.println("secTime - firstTime="+(secTime - firstTime));
	 if (KeyEvent.KEYCODE_BACK == keyCode) {
	 if (!backPath.equals(getSDPath())) {
	 getFileDir((new File(backPath)).getParent());
	 } else {
	 if (secTime - firstTime <= 2500) {
	 MainActivity.this.finish();
	 System.exit(0);
	 } else {
	 Toast.makeText(MainActivity.this, R.string.double_back, Toast.LENGTH_SHORT).show();
	 firstTime = System.currentTimeMillis();
	 return true;
	 }
	 }
	 }
	 return false;
	 } else {
	 return super.onKeyUp(keyCode, event);
	 }
	}

	private class OnFileManagerItemClickListener implements OnItemClickListener {

	 @Override
	 public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
	 long arg3) {
	 // TODO Auto-generated method stub
	 File file = new File(paths.get(arg2));
	 if(file.canRead()) {
	 if (file.isDirectory()) {
	 getFileDir(paths.get(arg2));
	 }else {
	 openSelectFile(file);
	 }
	 }
	 else {
	 /* 弹出AlertDialog提示*/
	 new AlertDialog.Builder(MainActivity.this)
	 .setTitle(R.string.friendly_tip)
	 .setMessage(R.string.file_cant_read)
	 .setPositiveButton("OK", new DialogInterface.OnClickListener() {
	 public void onClick(DialogInterface dialog,int which) {
	 dialog.dismiss();
	 }
	 }).show();
	 }
	 }
	}
	
	private boolean isSDAvailable() {
	 if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
	 return true;
	 }
	 return false;
	}
	
	private String getSDPath() {
	 String path = Environment.getExternalStoragePublicDirectory("").toString();
	 if (path == null) {
	 path = "/";
	 }
	 return path;
	}
	
	private void openSelectFile(File f) {
	 Intent intent = new Intent();
	 intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
	 intent.setAction(android.content.Intent.ACTION_VIEW);
	
	 String type = getFileType(f);
	 intent.setDataAndType(Uri.fromFile(f),type);
	 startActivity(intent);
	}

	 /**
	 * 判断文件类型
	 **/
	private String getFileType(File f) {
	 String type="";
	 String fName=f.getName();
	 /* 取得扩展名 */
	 String end=fName.substring(fName.lastIndexOf(".")+1,fName.length()).toLowerCase();
	
	 /* 依扩展名的类型决定FileType */
	 if(end.equals("mp3")||end.equals("mid")||end.equals("wav")||end.equals("aac")||
	 end.equals("amr"))
	 {
	 type = "audio";
	 }
	 else if(end.equals("3gp")||end.equals("mp4")||end.equals("rmvb"))
	 {
	 type = "video";
	 }
	 else if(end.equals("jpg")||end.equals("gif")||end.equals("png")||
	 end.equals("jpeg")||end.equals("bmp"))
	 {
	 type = "image";
	 }
	 else if(end.equals("apk"))
	 {
	 /* android.permission.INSTALL_PACKAGES */
	 type = "application/vnd.android.package-archive";
	 }
	 else if(end.equals("txt")||end.equals("c")||end.equals("java")||end.equals("xml")||
	 end.equals("cpp")) {
	 type = "text";
	 }
	 else
	 {
	 type="*";
	 }
	 /*若无法直接打开文件，就弹出软件列表*/
	 if(end.equals("apk"))
	 {
	 }
	 else
	 {
	 type += "/*";
	 }
	 return type;
	}
	}
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