Android读取SD卡.TXT文本内容

加入读写权限

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

代码

其中有数组和Arraylist两种方式取数据

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1. package readfile;  
2.   
3. import java.io.BufferedInputStream;  
4. import java.io.BufferedReader;  
5. import java.io.File;  
6. import java.io.FileInputStream;  
7. import java.io.IOException;  
8. import java.io.InputStream;  
9. import java.io.InputStreamReader;  
10. import java.util.ArrayList;  
11.   
12. import android.content.ContentUris;  
13. import android.content.ContentValues;  
14. import android.content.Context;  
15. import android.net.Uri;  
16. import android.os.Environment;  
17. import android.provider.ContactsContract.RawContacts;  
18. import android.provider.ContactsContract.CommonDataKinds.Phone;  
19. import android.provider.ContactsContract.Contacts.Data;  
20. import android.widget.Toast;  
21.   
22. public class readfile {  
23.     public Object  readFromFile(Context context){         
24.           
25.         if (Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState())) {               
26.             String foldername = Environment.getExternalStorageDirectory().getPath()+ "/";  
27.             File folder = new File(foldername);               
28.             if (folder == null || !folder.exists()) {  
29.                 folder.mkdir();  
30.             }              
31.             File targetFile=new File("/sdcard/Tel.txt");  
32.             String readedStr="";               
33.              try{  
34.                 if(!targetFile.exists()){  
35.                     targetFile.createNewFile();  
36.                     return "No File error ";  
37.                 }else{  
38.                      InputStream in = new BufferedInputStream(new FileInputStream(targetFile));  
39.                      BufferedReader br= new BufferedReader(new InputStreamReader(in, "UTF-8"));  
40.                      String tmp;  
41.                      int x = 0;  
42. //                     String [] arr = new String[60];  
43.                      ArrayList<String> List = new ArrayList<String>();                       
44.                      while((tmp=br.readLine())!=null){  
45.                          List.add(x, tmp) ;  
46. //                       arr[x] = tmp;  
47.                          System.out.println("123+"+List);   
48. //                       System.out.println("123+"+arr[x]);  
49.                          x++;  
50.                      }  
51.                      br.close();  
52.                      in.close();                        
53.                      return List;  
54. //                     return tmp;  
55.                 }  
56.              } catch (Exception e) {  
57.                     Toast.makeText(context,e.toString(),Toast.LENGTH_LONG).show();  
58.                     return e.toString();  
59.              }  
60.         }else{  
61.             Toast.makeText(context,"未发现SD卡！",Toast.LENGTH_LONG).show();  
62.             return "SD Card error";  
63.         }           
64.     }  
65. }      

转载：http://blog.csdn.net/chaoyu168/article/details/48807275