Android之簡單文件管理器

這裡運用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

1. <?xml version="1.0" encoding="utf-8"?>  
2. <LinearLayout xmlns:Android="http://schemas.android.com/apk/res/android"  
3.     android:orientation="vertical"  
4.     android:layout_width="fill_parent"  
5.     android:layout_height="fill_parent"  
6.     >  
7. <ListView    
8.     android:id="@android:id/list"  
9.     android:layout_width="wrap_content"  
10.     android:layout_height="wrap_content"  
11.     />  
12. </LinearLayout>  

layout/file.xml

1. <?xml version="1.0" encoding="utf-8"?>  
2. <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  
3.     android:orientation="horizontal"  
4.     android:layout_width="fill_parent"  
5.     android:layout_height="fill_parent"  
6.     >  
7. <ImageView  
8.     android:id="@+id/imageView"  
9.     android:layout_width="wrap_content"  
10.     android:layout_height="wrap_content"  
11. />  
12. <TextView  
13.   android:id="@+id/textView"  
14.   android:layout_width="wrap_content"  
15.   android:layout_height="wrap_content"  
16.   android:textSize="14sp">  
17. </TextView>  
18. </LinearLayout>  

修改文件名對話框布局文件：

layout/rename_dialog.xml

1. <?xml version="1.0" encoding="utf-8"?>  
2. <LinearLayout  
3.   xmlns:android="http://schemas.android.com/apk/res/android"  
4.   android:layout_width="match_parent"  
5.   android:layout_height="match_parent">  
6.   <EditText  
7.         android:id="@+id/editText"  
8.         android:layout_width="match_parent"  
9.         android:layout_height="wrap_content"    
10.   />  
11. </LinearLayout>  

1. public class MainActivity extends ListActivity {  
2.     private static final String ROOT_PATH = "/";  
3.     //存儲文件名稱   
4.     private ArrayList<String> names = null;  
5.     //存儲文件路徑   
6.     private ArrayList<String> paths = null;  
7.     private View view;  
8.     private EditText editText;  
9.     /** Called when the activity is first created. */  
10.     @Override  
11.     public void onCreate(Bundle savedInstanceState) {  
12.         super.onCreate(savedInstanceState);  
13.         setContentView(R.layout.main);  
14.         //顯示文件列表   
15.         showFileDir(ROOT_PATH);  
16.     }  
17.     private void showFileDir(String path){  
18.         names = new ArrayList<String>();  
19.         paths = new ArrayList<String>();  
20.         File file = new File(path);  
21.         File[] files = file.listFiles();  
22.           
23.         //如果當前目錄不是根目錄   
24.         if (!ROOT_PATH.equals(path)){  
25.             names.add("@1");  
26.             paths.add(ROOT_PATH);  
27.               
28.             names.add("@2");  
29.             paths.add(file.getParent());  
30.         }  
31.         //添加所有文件   
32.         for (File f : files){  
33.             names.add(f.getName());  
34.             paths.add(f.getPath());  
35.         }  
36.         this.setListAdapter(new MyAdapter(this,names, paths));  
37.     }  
38.     @Override  
39.     protected void onListItemClick(ListView l, View v, int position, long id) {  
40.         String path = paths.get(position);  
41.         File file = new File(path);  
42.         // 文件存在並可讀   
43.         if (file.exists() && file.canRead()){  
44.             if (file.isDirectory()){  
45.                 //顯示子目錄及文件   
46.                 showFileDir(path);  
47.             }  
48.             else{  
49.                 //處理文件   
50.                 fileHandle(file);  
51.             }  
52.         }  
53.         //沒有權限   
54.         else{  
55.             Resources res = getResources();  
56.             new AlertDialog.Builder(this).setTitle("Message")  
57.             .setMessage(res.getString(R.string.no_permission))  
58.             .setPositiveButton("OK",new OnClickListener() {  
59.                 @Override  
60.                 public void onClick(DialogInterface dialog, int which) {  
61.                       
62.                 }  
63.             }).show();  
64.         }  
65.         super.onListItemClick(l, v, position, id);  
66.     }  
67.     //對文件進行增刪改   
68.     private void fileHandle(final File file){  
69.         OnClickListener listener = new DialogInterface.OnClickListener() {  
70.             @Override  
71.             public void onClick(DialogInterface dialog, int which) {  
72.                 // 打開文件   
73.                 if (which == 0){  
74.                     openFile(file);  
75.                 }  
76.                 //修改文件名   
77.                 else if(which == 1){  
78.                     LayoutInflater factory = LayoutInflater.from(MainActivity.this);  
79.                     view = factory.inflate(R.layout.rename_dialog, null);  
80.                     editText = (EditText)view.findViewById(R.id.editText);  
81.                     editText.setText(file.getName());  
82.                       
83.                     OnClickListener listener2 = new DialogInterface.OnClickListener() {  
84.                         @Override  
85.                         public void onClick(DialogInterface dialog, int which) {  
86.                             // TODO Auto-generated method stub   
87.                             String modifyName = editText.getText().toString();  
88.                             final String fpath = file.getParentFile().getPath();  
89.                             final File newFile = new File(fpath + "/" + modifyName);  
90.                             if (newFile.exists()){  
91.                                 //排除沒有修改情況   
92.                                 if (!modifyName.equals(file.getName())){  
93.                                     new AlertDialog.Builder(MainActivity.this)  
94.                                     .setTitle("注意!")  
95.                                     .setMessage("文件名已存在，是否覆蓋？")  
96.                                     .setPositiveButton("確定", new DialogInterface.OnClickListener() {  
97.                                         @Override  
98.                                         public void onClick(DialogInterface dialog, int which) {  
99.                                             if (file.renameTo(newFile)){  
100.                                                 showFileDir(fpath);  
101.                                                 displayToast("重命名成功！");  
102.                                             }  
103.                                             else{  
104.                                                 displayToast("重命名失敗！");  
105.                                             }  
106.                                         }  
107.                                     })  
108.                                     .setNegativeButton("取消", new DialogInterface.OnClickListener() {  
109.                                         @Override  
110.                                         public void onClick(DialogInterface dialog, int which) {  
111.                                               
112.                                         }  
113.                                     })  
114.                                     .show();  
115.                                 }  
116.                             }  
117.                             else{  
118.                                 if (file.renameTo(newFile)){  
119.                                     showFileDir(fpath);  
120.                                     displayToast("重命名成功！");  
121.                                 }  
122.                                 else{  
123.                                     displayToast("重命名失敗！");  
124.                                 }  
125.                             }  
126.                         }  
127.                     };  
128.                     AlertDialog renameDialog = new AlertDialog.Builder(MainActivity.this).create();  
129.                     renameDialog.setView(view);  
130.                     renameDialog.setButton("確定", listener2);  
131.                     renameDialog.setButton2("取消", new DialogInterface.OnClickListener() {  
132.                         @Override  
133.                         public void onClick(DialogInterface dialog, int which) {  
134.                             // TODO Auto-generated method stub   
135.                               
136.                         }  
137.                     });  
138.                     renameDialog.show();  
139.                 }  
140.                 //刪除文件   
141.                 else{  
142.                     new AlertDialog.Builder(MainActivity.this)  
143.                     .setTitle("注意!")  
144.                     .setMessage("確定要刪除此文件嗎？")  
145.                     .setPositiveButton("確定", new DialogInterface.OnClickListener() {  
146.                         @Override  
147.                         public void onClick(DialogInterface dialog, int which) {  
148.                             if(file.delete()){  
149.                                 //更新文件列表   
150.                                 showFileDir(file.getParent());  
151.                                 displayToast("刪除成功！");  
152.                             }  
153.                             else{  
154.                                 displayToast("刪除失敗！");  
155.                             }  
156.                         }  
157.                     })  
158.                     .setNegativeButton("取消", new DialogInterface.OnClickListener() {  
159.                         @Override  
160.                         public void onClick(DialogInterface dialog, int which) {  
161.                               
162.                         }  
163.                     }).show();  
164.                 }  
165.             }  
166.         };  
167.         //選擇文件時，彈出增刪該操作選項對話框   
168.         String[] menu = {"打開文件","重命名","刪除文件"};  
169.         new AlertDialog.Builder(MainActivity.this)  
170.         .setTitle("請選擇要進行的操作!")  
171.         .setItems(menu, listener)  
172.         .setPositiveButton("取消", new DialogInterface.OnClickListener() {  
173.             @Override  
174.             public void onClick(DialogInterface dialog, int which) {  
175.                   
176.             }  
177.         }).show();  
178.     }  
179.     //打開文件   
180.     private void openFile(File file){  
181.         Intent intent = new Intent();  
182.         intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);  
183.         intent.setAction(android.content.Intent.ACTION_VIEW);  
184.           
185.         String type = getMIMEType(file);  
186.         intent.setDataAndType(Uri.fromFile(file), type);  
187.         startActivity(intent);  
188.     }  
189.     //獲取文件mimetype   
190.     private String getMIMEType(File file){  
191.         String type = "";  
192.         String name = file.getName();  
193.         //文件擴展名   
194.         String end = name.substring(name.lastIndexOf(".") + 1, name.length()).toLowerCase();  
195.         if (end.equals("m4a") || end.equals("mp3") || end.equals("wav")){  
196.             type = "audio";  
197.         }  
198.         else if(end.equals("mp4") || end.equals("3gp")) {  
199.             type = "video";  
200.         }  
201.         else if (end.equals("jpg") || end.equals("png") || end.equals("jpeg") || end.equals("bmp") || end.equals("gif")){  
202.             type = "image";  
203.         }  
204.         else {  
205.             //如果無法直接打開，跳出列表由用戶選擇   
206.             type = "*";  
207.         }  
208.         type += "/*";  
209.         return type;  
210.     }  
211.     private void displayToast(String message){  
212.         Toast.makeText(MainActivity.this, message, Toast.LENGTH_SHORT).show();  
213.     }  
214. }