Android 文件读写的例子

 1 import java.io.FileInputStream;
 2 import java.io.FileNotFoundException;
 3 import java.io.FileOutputStream;
 4 import java.io.IOException;
 5 import org.apache.http.util.EncodingUtils;
 6
 7 public class MyLogFile {
 8       private static FileOutputStream fout;
 9       public MyLogFile() {
10       }
11
12       public static void createFile(){
13            try {
14                 fout = new FileOutputStream("/mnt/sdcard/zyrPad.txt");
15                 // fout = openFileOutput("/mnt/sdcard/zyrPad.txt",Mode);
16           } catch (FileNotFoundException e) {
17                 e.printStackTrace();
18           }
19      }
20
21      //写在/mnt/sdcard/目录下面的文件
22      public static void writeFileSdcard(String message){
23            try{
24                  //FileOutputStream fout = openFileOutput(fileName, MODE_PRIVATE);
25                 message= message+"\n";
26                 byte [] bytes = message.getBytes();
27                 fout.write(bytes);
28            } catch(Exception e){
29                 e.printStackTrace();
30            }
31       }
32
33       //读在/mnt/sdcard/目录下面的文件
34       public String readFileSdcard(String fileName){
35             String res="";
36             try{
37                   FileInputStream fin = new FileInputStream(fileName);
38                   int length = fin.available();
39                   byte [] buffer = new byte[length];
40                   fin.read(buffer);
41                   res = EncodingUtils.getString(buffer, "UTF-8");
42                   fin.close();
43             } catch(Exception e){
44                   e.printStackTrace();
45             }
46             return res;
47       }
48
49       /** * 关闭文件流 */
50       public static void closeFile(){
51             try {
52                  fout.close();
53             } catch (IOException e) {
54                  e.printStackTrace();
55             }
56       }
57 } 

调用的时候很简单：
MyLogFile.createFile();//创建文件
MyLogFile.writeFileSdcard("------------写文字到文件中----------------");

使用完后，记得关闭：
MyLogFile.closeFile()