[Android实例] 仿Windows 文件浏览 文件选择器

最近在做一个音乐播放器的小实例，其中涉及音乐文件选取。通过窗口模式的Activity来选择添加音乐文件或者文件夹。

menuaddgridview.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="wrap_content"
   
5. android:layout_height="wrap_content">
   
6. <RelativeLayout
   
7. xmlns:android="http://schemas.android.com/apk/res/android"
   
8. android:orientation="horizontal"
   
9. android:layout_width="match_parent"
   
10. android:layout_height="wrap_content"
    
11. android:background="@drawable/radiogroup_bg1"
    
12. android:padding="5.0dip">
    
13. <ImageButton
    
14. android:id="@+id/MenuAddGridView_button_openfolder"
    
15. android:layout_width="wrap_content" android:layout_height="wrap_content"
    
16. android:layout_marginLeft="10.0dip"
    
17. android:src="@drawable/radiogroup_openfolder"
    
18. android:adjustViewBounds="true"
    
19. android:padding="10.0dip"
    
20. android:layout_alignParentLeft="true"/>
    
21. <ImageButton
    
22. android:id="@+id/MenuAddGridView_button_addSingle"
    
23. android:layout_width="wrap_content" android:layout_height="wrap_content"
    
24. android:layout_marginLeft="10.0dip"
    
25. android:src="@drawable/radiogroup_addsingle"
    
26. android:adjustViewBounds="true"
    
27. android:padding="10.0dip"
    
28. android:layout_toRightOf="@id/MenuAddGridView_button_openfolder"/>
    
29. <ImageButton
    
30. android:id="@+id/MenuAddGridView_button_addFolder"
    
31. android:layout_width="wrap_content" android:layout_height="wrap_content"
    
32. android:layout_marginLeft="10.0dip"
    
33. android:src="@drawable/radiogroup_addfolder"
    
34. android:adjustViewBounds="true"
    
35. android:padding="10.0dip"
    
36. android:layout_toRightOf="@id/MenuAddGridView_button_addSingle"/>
    
37. <ImageButton
    
38. android:id="@+id/MenuAddGridView_button_backFolder"
    
39. android:layout_width="wrap_content" android:layout_height="wrap_content"
    
40. android:layout_marginRight="10.0dip"
    
41. android:src="@drawable/radiogroup_backfolder"
    
42. android:adjustViewBounds="true"
    
43. android:padding="10.0dip"
    
44. android:layout_alignParentRight="true"/>
    
45. </RelativeLayout>
    
46. <GridView xmlns:android="http://schemas.android.com/apk/res/android"
    
47. android:id="@+id/MenuAddGridView_gridview"
    
48. android:layout_width="match_parent"
    
49. android:layout_height="match_parent"
    
50. android:numColumns="auto_fit"
    
51. android:verticalSpacing="10dp"
    
52. android:horizontalSpacing="10dp"
    
53. android:columnWidth="90dp"
    
54. android:stretchMode="columnWidth"
    
55. android:gravity="center"
    
56. />
    
57. 
    
58. </LinearLayout>

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menuaddgridview_item.xml

1. <?xml version="1.0" encoding="utf-8"?>
   
2. <RelativeLayout
   
3. xmlns:android="http://schemas.android.com/apk/res/android"
   
4. android:layout_height="wrap_content"
   
5. android:paddingBottom="4dip" android:layout_width="fill_parent">
   
6. <ImageView
   
7. android:layout_height="wrap_content"
   
8. android:id="@+id/MenuAddGridView_ItemImage"
   
9. android:layout_width="wrap_content"
   
10. android:layout_centerHorizontal="true">
    
11. </ImageView>
    
12. <TextView
    
13. android:layout_width="wrap_content"
    
14. android:layout_below="@id/MenuAddGridView_ItemImage"
    
15. android:layout_height="wrap_content"
    
16. android:layout_centerHorizontal="true"
    
17. android:id="@+id/MenuAddGridView_ItemText">
    
18. </TextView>
    
19. </RelativeLayout>

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设置Activity为窗口模式

<activity android:name=".MenuAddGridView" android:theme="@android:style/Theme.Dialog"></activity>

记得要添加权限

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission>

MenuAddGridView的代码：

1. public class MenuAddGridView extends Activity {
   
2. GridView gridview;
   
3. SimpleAdapter gridviewAdapter;
   
4. ImageButton openFolder,addSingle,addFolder,backFolder;
   
5. String sdcardFilePath,thisFilePath,selectFilePath;
   
6. 
   
7. protected void onCreate(Bundle savedInstanceState) {
   
8. super.onCreate(savedInstanceState);
   
9. this.requestWindowFeature(Window.FEATURE_NO_TITLE);//去掉标题栏
   
10. this.setContentView(R.layout.menuaddgridview);
    
11. 
    
12. sdcardFilePath=Environment.getExternalStorageDirectory().getAbsolutePath();//得到sdcard目录
    
13. thisFilePath=sdcardFilePath;
    
14. 
    
15. openFolder=(ImageButton) this.findViewById(R.id.MenuAddGridView_button_openfolder);
    
16. openFolder.setVisibility(View.INVISIBLE);//设置不可见
    
17. openFolder.setOnClickListener(new buttonOnClickListener());//添加监听器
    
18. addSingle=(ImageButton) this.findViewById(R.id.MenuAddGridView_button_addSingle);
    
19. addSingle.setVisibility(View.INVISIBLE);
    
20. addSingle.setOnClickListener(new buttonOnClickListener());
    
21. addFolder=(ImageButton) this.findViewById(R.id.MenuAddGridView_button_addFolder);
    
22. addFolder.setVisibility(View.INVISIBLE);
    
23. addFolder.setOnClickListener(new buttonOnClickListener());
    
24. backFolder=(ImageButton) this.findViewById(R.id.MenuAddGridView_button_backFolder);
    
25. backFolder.setOnClickListener(new buttonOnClickListener());
    
26. 
    
27. gridview=(GridView) this.findViewById(R.id.MenuAddGridView_gridview);
    
28. //设置gridView的数据
    
29. updategridviewAdapter(thisFilePath);
    
30. gridview.setOnItemClickListener(new OnItemClickListener(){
    
31. public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
    
32. long arg3) {
    
33. HashMap<String, Object> item=(HashMap<String, Object>) arg0.getItemAtPosition(arg2);
    
34. selectFilePath=(String) item.get("ItemFilePath");
    
35. 
    
36. if(item.get("type").equals("isDirectory"))//判断是否是文件夹
    
37. {
    
38. openFolder.setVisibility(View.VISIBLE);//打开文件按钮可见
    
39. addSingle.setVisibility(View.INVISIBLE);//选择单曲按钮不可见
    
40. addFolder.setVisibility(View.VISIBLE);//选择整个文件夹按钮可见
    
41. }
    
42. else if(item.get("type").equals("isMp3"))
    
43. {
    
44. openFolder.setVisibility(View.INVISIBLE);
    
45. addSingle.setVisibility(View.VISIBLE);
    
46. addFolder.setVisibility(View.INVISIBLE);
    
47. }
    
48. else
    
49. {
    
50. openFolder.setVisibility(View.INVISIBLE);
    
51. addSingle.setVisibility(View.INVISIBLE);
    
52. addFolder.setVisibility(View.INVISIBLE);
    
53. }
    
54. 
    
55. }});
    
56. this.setResult(0);
    
57. }
    
58. private File[] folderScan(String path)
    
59. {
    
60. File file=new File(path);
    
61. File[] files=file.listFiles();
    
62. return files;
    
63. }
    
64. //设置gridView的数据
    
65. private void updategridviewAdapter(String filePath)
    
66. {
    
67. File[] files=folderScan(filePath);
    
68. ArrayList<HashMap<String, Object>> lstImageItem = getFileItems(files);
    
69. gridviewAdapter = new SimpleAdapter(MenuAddGridView.this,lstImageItem,R.layout.menuaddgridview_item,new String[] {"ItemImage","ItemText"}, new int[] {R.id.MenuAddGridView_ItemImage,R.id.MenuAddGridView_ItemText});
    
70. gridview.setAdapter(gridviewAdapter);
    
71. gridviewAdapter.notifyDataSetChanged();
    
72. }
    
73. //列表循环判断文件类型然后提供数据给Adapter用
    
74. private ArrayList<HashMap<String, Object>> getFileItems(File[] files)
    
75. {
    
76. ArrayList<HashMap<String, Object>> lstImageItem = new ArrayList<HashMap<String, Object>>();
    
77. //循环加入listImageItem数据
    
78. if(files==null)
    
79. {
    
80. return null;
    
81. }
    
82. for(int i=0;i<files.length;i++)
    
83. {
    
84. HashMap<String, Object> map = new HashMap<String, Object>();
    
85. String fileName=files[i].getName();//得到file名
    
86. map.put("ItemText", fileName);
    
87. if(files[i].isDirectory())//判断是否是文件夹
    
88. {
    
89. map.put("ItemImage", R.drawable.folder);//显示文件夹图标
    
90. map.put("type", "isDirectory");
    
91. }
    
92. else if(files[i].isFile())//判断是否是文件
    
93. {
    
94. if(fileName.contains(".mp3"))//判断是否是MP3文件
    
95. {
    
96. map.put("ItemImage", R.drawable.mp3flie);//加入MP3图标
    
97. map.put("type", "isMp3");
    
98. }
    
99. else
    
100. {
     
101. map.put("ItemImage", R.drawable.otherfile);//加入非MP3文件图标
     
102. map.put("type", "isOthers");
     
103. }
     
104. }
     
105. map.put("ItemFilePath", files[i].getAbsolutePath());//保存文件绝对路径
     
106. 
     
107. lstImageItem.add(map);
     
108. }
     
109. return lstImageItem;
     
110. }
     
111. private ArrayList<String> getResultArrayList(ArrayList<HashMap<String, Object>> al)
     
112. {
     
113. ArrayList<String> musicResult=new ArrayList<String>();
     
114. for(int i=0;i<al.size();i++)
     
115. {
     
116. HashMap<String, Object> map=al.get(i);
     
117. String type=(String) map.get("type");
     
118. String itemFilePath=(String) map.get("ItemFilePath");
     
119. if(type.equals("isMp3"))
     
120. {
     
121. musicResult.add(itemFilePath);
     
122. }
     
123. }
     
124. return musicResult;
     
125. }
     
126. class buttonOnClickListener implements OnClickListener
     
127. {
     
128. ArrayList<String> musicResult;
     
129. Intent intent;
     
130. public void onClick(View v) {
     
131. switch(v.getId())
     
132. {
     
133. case R.id.MenuAddGridView_button_openfolder://打开文件夹
     
134. updategridviewAdapter(selectFilePath);//获取文件夹下数据并显示
     
135. thisFilePath=selectFilePath;//记录当前目录路径
     
136. openFolder.setVisibility(View.INVISIBLE);
     
137. addSingle.setVisibility(View.INVISIBLE);
     
138. addFolder.setVisibility(View.INVISIBLE);
     
139. break;
     
140. case R.id.MenuAddGridView_button_addSingle:
     
141. musicResult=new ArrayList<String>();
     
142. musicResult.add(selectFilePath);
     
143. intent=new Intent();
     
144. intent.putStringArrayListExtra("musicResult", musicResult);
     
145. MenuAddGridView.this.setResult(1, intent);
     
146. MenuAddGridView.this.onDestroy();
     
147. break;
     
148. case R.id.MenuAddGridView_button_addFolder:
     
149. //得到文件夹下所有mp3文件
     
150. musicResult=getResultArrayList(getFileItems(folderScan(selectFilePath)));
     
151. intent=new Intent();
     
152. //返回给上一个activity数据
     
153. intent.putStringArrayListExtra("musicResult", musicResult);
     
154. MenuAddGridView.this.setResult(1, intent);
     
155. MenuAddGridView.this.onDestroy();
     
156. break;
     
157. case R.id.MenuAddGridView_button_backFolder://返回上级目录
     
158. if(!thisFilePath.equals(sdcardFilePath))
     
159. {
     
160. File thisFile=new File(thisFilePath);//得到当前目录
     
161. String parentFilePath=thisFile.getParent();//上级的目录路径
     
162. updategridviewAdapter(parentFilePath);//获得上级目录数据并显示
     
163. thisFilePath=parentFilePath;//设置当前目录路径
     
164. 
     
165. openFolder.setVisibility(View.INVISIBLE);
     
166. addSingle.setVisibility(View.INVISIBLE);
     
167. addFolder.setVisibility(View.INVISIBLE);
     
168. }
     
169. else
     
170. {
     
171. MenuAddGridView.this.onDestroy();
     
172. }
     
173. break;
     
174. }
     
175. }
     
176. 
     
177. }
     
178. protected void onDestroy() {
     
179. this.finish();
     
180. super.onDestroy();
     
181. }
     
182. 
     
183. }

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效果图：