Android读取SD卡.TXT文本内容-白红宇

加入读写权限

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

[java]
package readfile;  
  
import java.io.BufferedInputStream;  
import java.io.BufferedReader;  
import java.io.File;  
import java.io.FileInputStream;  
import java.io.IOException;  
import java.io.InputStream;  
import java.io.InputStreamReader;  
import java.util.ArrayList;  
  
import android.content.ContentUris;  
import android.content.ContentValues;  
import android.content.Context;  
import android.net.Uri;  
import android.os.Environment;  
import android.provider.ContactsContract.RawContacts;  
import android.provider.ContactsContract.CommonDataKinds.Phone;  
import android.provider.ContactsContract.Contacts.Data;  
import android.widget.Toast;  
  
public class readfile {  
    public Object  readFromFile(Context context){         
          
        if (Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState())) {               
            String foldername = Environment.getExternalStorageDirectory().getPath()+ "/";  
            File folder = new File(foldername);               
            if (folder == null || !folder.exists()) {  
                folder.mkdir();  
            }              
            File targetFile=new File("/sdcard/Tel.txt");  
            String readedStr="";               
             try{  
                if(!targetFile.exists()){  
                    targetFile.createNewFile();  
                    return "No File error ";  
                }else{  
                     InputStream in = new BufferedInputStream(new FileInputStream(targetFile));  
                     BufferedReader br= new BufferedReader(new InputStreamReader(in, "UTF-8"));  
                     String tmp;  
                     int x = 0;  
//                     String [] arr = new String[60];  
                     ArrayList<String> List = new ArrayList<String>();                       
                     while((tmp=br.readLine())!=null){  
                         List.add(x, tmp) ;  
//                       arr[x] = tmp;  
                         System.out.println("123+"+List);   
//                       System.out.println("123+"+arr[x]);  
                         x++;  
                     }  
                     br.close();  
                     in.close();                        
                     return List;  
//                     return tmp;  
                }  
             } catch (Exception e) {  
                    Toast.makeText(context,e.toString(),Toast.LENGTH_LONG).show();  
                    return e.toString();  
             }  
        }else{  
            Toast.makeText(context,"未发现SD卡！",Toast.LENGTH_LONG).show();  
            return "SD Card error";  
        }           
    }  
}      
 

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