Android开发之简单文件管理器实现方法
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2023-12-18 15:04:16
本文实例讲述了android开发之简单文件管理器实现方法。分享给大家供大家参考，具体如下：
这里运用java i/o、listactivity、dialog、bitmap...
本文实例讲述了android开发之简单文件管理器实现方法。分享给大家供大家参考，具体如下：
这里运用java i/o、listactivity、dialog、bitmap等实现简单文件管理器，可以查看目录文件，修改文件名，删除文件，打开文件。比较简单，直接看代码：
先看布局文件：
layout/main.xml
<?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
<?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>
修改文件名对话框布局文件：
layout/rename_dialog.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"> <edittext android:id="@+id/edittext" android:layout_width="match_parent" android:layout_height="wrap_content" /> </linearlayout>
主activity:
public class mainactivity extends listactivity {
private static final string root_path = "/";
//存储文件名称
private arraylist<string> names = null;
//存储文件路径
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);
//显示文件列表
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();
//如果当前目录不是根目录
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);
// 文件存在并可读
if (file.exists() && file.canread()){
if (file.isdirectory()){
//显示子目录及文件
showfiledir(path);
}
else{
//处理文件
filehandle(file);
}
}
//没有权限
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);
}
//对文件进行增删改
private void filehandle(final file file){
onclicklistener listener = new dialoginterface.onclicklistener() {
@override
public void onclick(dialoginterface dialog, int which) {
// 打开文件
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()){
//排除没有修改情况
if (!modifyname.equals(file.getname())){
new alertdialog.builder(mainactivity.this)
.settitle("注意!")
.setmessage("文件名已存在，是否覆盖？")
.setpositivebutton("确定", 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("重命名失败！");
}
}
})
.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("重命名失败！");
}
}
}
};
alertdialog renamedialog = new alertdialog.builder(mainactivity.this).create();
renamedialog.setview(view);
renamedialog.setbutton("确定", listener2);
renamedialog.setbutton2("取消", new dialoginterface.onclicklistener() {
@override
public void onclick(dialoginterface dialog, int which) {
// todo auto-generated method stub
}
});
renamedialog.show();
}
//删除文件
else{
new alertdialog.builder(mainactivity.this)
.settitle("注意!")
.setmessage("确定要删除此文件吗？")
.setpositivebutton("确定", new dialoginterface.onclicklistener() {
@override
public void onclick(dialoginterface dialog, int which) {
if(file.delete()){
//更新文件列表
showfiledir(file.getparent());
displaytoast("删除成功！");
}
else{
displaytoast("删除失败！");
}
}
})
.setnegativebutton("取消", new dialoginterface.onclicklistener() {
@override
public void onclick(dialoginterface dialog, int which) {
}
}).show();
}
}
};
//选择文件时，弹出增删该操作选项对话框
string[] menu = {"打开文件","重命名","删除文件"};
new alertdialog.builder(mainactivity.this)
.settitle("请选择要进行的操作!")
.setitems(menu, listener)
.setpositivebutton("取消", new dialoginterface.onclicklistener() {
@override
public void onclick(dialoginterface dialog, int which) {
}
}).show();
}
//打开文件
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);
}
//获取文件mimetype
private string getmimetype(file file){
string type = "";
string name = file.getname();
//文件扩展名
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 {
//如果无法直接打开，跳出列表由用户选择
type = "*";
}
type += "/*";
return type;
}
private void displaytoast(string message){
toast.maketext(mainactivity.this, message, toast.length_short).show();
}
}
自定义适配器：
public class myadapter extends baseadapter{
private layoutinflater inflater;
private bitmap directory,file;
//存储文件名称
private arraylist<string> names = null;
//存储文件路径
private arraylist<string> paths = null;
//参数初始化
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);
//缩小图片
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);
}
}
因为要对文件进行操作，所以在描述文件中授权：
<?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>
运行结果如下：
查看目录文件
文件重命名：
删除文件：
打开文件:
希望本文所述对大家android程序设计有所帮助。