本文實例講述了android開發之簡單文件管理器實現方法。分享給大家供大家參考，具體如下：
這里運用java i/o、listactivity、dialog、bitmap等實現簡單文件管理器，可以查看目錄文件，修改文件名，刪除文件，打開文件。比較簡單，直接看代碼：
先看布局文件：
layout/main.xml
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<?xml version="1.0" encoding="utf-8"?><linearlayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" ><listview android:id="@android:id/list" android:layout_width="wrap_content" android:layout_height="wrap_content" /></linearlayout> |
文件列表布局:
layout/file.xml
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<?xml version="1.0" encoding="utf-8"?><linearlayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="horizontal" android:layout_width="fill_parent" android:layout_height="fill_parent" ><imageview android:id="@+id/imageview" android:layout_width="wrap_content" android:layout_height="wrap_content"/><textview android:id="@+id/textview" android:layout_width="wrap_content" android:layout_height="wrap_content" android:textsize="14sp"></textview></linearlayout> |
修改文件名對話框布局文件：
layout/rename_dialog.xml
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<?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"> <edittext android:id="@+id/edittext" android:layout_width="match_parent" android:layout_height="wrap_content" /></linearlayout> |
主activity:
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public class mainactivity extends listactivity { private static final string root_path = "/"; //存儲文件名稱 private arraylist<string> names = null; //存儲文件路徑 private arraylist<string> paths = null; private view view; private edittext edittext; /** called when the activity is first created. */ @override public void oncreate(bundle savedinstancestate) { super.oncreate(savedinstancestate); setcontentview(r.layout.main); //顯示文件列表 showfiledir(root_path); } private void showfiledir(string path){ names = new arraylist<string>(); paths = new arraylist<string>(); file file = new file(path); file[] files = file.listfiles(); //如果當前目錄不是根目錄 if (!root_path.equals(path)){ names.add("@1"); paths.add(root_path); names.add("@2"); paths.add(file.getparent()); } //添加所有文件 for (file f : files){ names.add(f.getname()); paths.add(f.getpath()); } this.setlistadapter(new myadapter(this,names, paths)); } @override protected void onlistitemclick(listview l, view v, int position, long id) { string path = paths.get(position); file file = new file(path); // 文件存在并可讀 if (file.exists() && file.canread()){ if (file.isdirectory()){ //顯示子目錄及文件 showfiledir(path); } else{ //處理文件 filehandle(file); } } //沒有權限 else{ resources res = getresources(); new alertdialog.builder(this).settitle("message") .setmessage(res.getstring(r.string.no_permission)) .setpositivebutton("ok",new onclicklistener() { @override public void onclick(dialoginterface dialog, int which) { } }).show(); } super.onlistitemclick(l, v, position, id); } //對文件進行增刪改 private void filehandle(final file file){ onclicklistener listener = new dialoginterface.onclicklistener() { @override public void onclick(dialoginterface dialog, int which) { // 打開文件 if (which == 0){ openfile(file); } //修改文件名 else if(which == 1){ layoutinflater factory = layoutinflater.from(mainactivity.this); view = factory.inflate(r.layout.rename_dialog, null); edittext = (edittext)view.findviewbyid(r.id.edittext); edittext.settext(file.getname()); onclicklistener listener2 = new dialoginterface.onclicklistener() { @override public void onclick(dialoginterface dialog, int which) { // todo auto-generated method stub string modifyname = edittext.gettext().tostring(); final string fpath = file.getparentfile().getpath(); final file newfile = new file(fpath + "/" + modifyname); if (newfile.exists()){ //排除沒有修改情況 if (!modifyname.equals(file.getname())){ new alertdialog.builder(mainactivity.this) .settitle("注意!") .setmessage("文件名已存在，是否覆蓋？") .setpositivebutton("確定", new dialoginterface.onclicklistener() { @override public void onclick(dialoginterface dialog, int which) { if (file.renameto(newfile)){ showfiledir(fpath); displaytoast("重命名成功！"); } else{ displaytoast("重命名失敗！"); } } }) .setnegativebutton("取消", new dialoginterface.onclicklistener() { @override public void onclick(dialoginterface dialog, int which) { } }) .show(); } } else{ if (file.renameto(newfile)){ showfiledir(fpath); displaytoast("重命名成功！"); } else{ displaytoast("重命名失敗！"); } } } }; alertdialog renamedialog = new alertdialog.builder(mainactivity.this).create(); renamedialog.setview(view); renamedialog.setbutton("確定", listener2); renamedialog.setbutton2("取消", new dialoginterface.onclicklistener() { @override public void onclick(dialoginterface dialog, int which) { // todo auto-generated method stub } }); renamedialog.show(); } //刪除文件 else{ new alertdialog.builder(mainactivity.this) .settitle("注意!") .setmessage("確定要刪除此文件嗎？") .setpositivebutton("確定", new dialoginterface.onclicklistener() { @override public void onclick(dialoginterface dialog, int which) { if(file.delete()){ //更新文件列表 showfiledir(file.getparent()); displaytoast("刪除成功！"); } else{ displaytoast("刪除失敗！"); } } }) .setnegativebutton("取消", new dialoginterface.onclicklistener() { @override public void onclick(dialoginterface dialog, int which) { } }).show(); } } }; //選擇文件時，彈出增刪該操作選項對話框 string[] menu = {"打開文件","重命名","刪除文件"}; new alertdialog.builder(mainactivity.this) .settitle("請選擇要進行的操作!") .setitems(menu, listener) .setpositivebutton("取消", new dialoginterface.onclicklistener() { @override public void onclick(dialoginterface dialog, int which) { } }).show(); } //打開文件 private void openfile(file file){ intent intent = new intent(); intent.addflags(intent.flag_activity_new_task); intent.setaction(android.content.intent.action_view); string type = getmimetype(file); intent.setdataandtype(uri.fromfile(file), type); startactivity(intent); } //獲取文件mimetype private string getmimetype(file file){ string type = ""; string name = file.getname(); //文件擴展名 string end = name.substring(name.lastindexof(".") + 1, name.length()).tolowercase(); if (end.equals("m4a") || end.equals("mp3") || end.equals("wav")){ type = "audio"; } else if(end.equals("mp4") || end.equals("3gp")) { type = "video"; } else if (end.equals("jpg") || end.equals("png") || end.equals("jpeg") || end.equals("bmp") || end.equals("gif")){ type = "image"; } else { //如果無法直接打開，跳出列表由用戶選擇 type = "*"; } type += "/*"; return type; } private void displaytoast(string message){ toast.maketext(mainactivity.this, message, toast.length_short).show(); }} |
自定義適配器：
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public class myadapter extends baseadapter{ private layoutinflater inflater; private bitmap directory,file; //存儲文件名稱 private arraylist<string> names = null; //存儲文件路徑 private arraylist<string> paths = null; //參數初始化 public myadapter(context context,arraylist<string> na,arraylist<string> pa){ names = na; paths = pa; directory = bitmapfactory.decoderesource(context.getresources(),r.drawable.d); file = bitmapfactory.decoderesource(context.getresources(),r.drawable.f); //縮小圖片 directory = small(directory,0.16f); file = small(file,0.1f); inflater = layoutinflater.from(context); } @override public int getcount() { // todo auto-generated method stub return names.size(); } @override public object getitem(int position) { // todo auto-generated method stub return names.get(position); } @override public long getitemid(int position) { // todo auto-generated method stub return position; } @override public view getview(int position, view convertview, viewgroup parent) { // todo auto-generated method stub viewholder holder; if (null == convertview){ convertview = inflater.inflate(r.layout.file, null); holder = new viewholder(); holder.text = (textview)convertview.findviewbyid(r.id.textview); holder.image = (imageview)convertview.findviewbyid(r.id.imageview); convertview.settag(holder); } else { holder = (viewholder)convertview.gettag(); } file f = new file(paths.get(position).tostring()); if (names.get(position).equals("@1")){ holder.text.settext("/"); holder.image.setimagebitmap(directory); } else if (names.get(position).equals("@2")){ holder.text.settext(".."); holder.image.setimagebitmap(directory); } else{ holder.text.settext(f.getname()); if (f.isdirectory()){ holder.image.setimagebitmap(directory); } else if (f.isfile()){ holder.image.setimagebitmap(file); } else{ system.out.println(f.getname()); } } return convertview; } private class viewholder{ private textview text; private imageview image; } private bitmap small(bitmap map,float num){ matrix matrix = new matrix(); matrix.postscale(num, num); return bitmap.createbitmap(map,0,0,map.getwidth(),map.getheight(),matrix,true); }} |
因為要對文件進行操作，所以在描述文件中授權：
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<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.test.filemanager" android:versioncode="1" android:versionname="1.0"> <uses-sdk android:minsdkversion="10" /> <strong> <uses-permission android:name="android.permission.mount_unmount_filesystems"/> <uses-permission android:name="android.permission.write_external_storage"/></strong> <application android:icon="@drawable/icon" android:label="@string/app_name"> <activity android:name=".mainactivity" android:label="@string/app_name"> <intent-filter> <action android:name="android.intent.action.main" /> <category android:name="android.intent.category.launcher" /> </intent-filter> </activity> </application></manifest> |
運行結果如下：
查看目錄文件
文件重命名：
刪除文件：
打開文件:
希望本文所述對大家android程序設計有所幫助。
