Android读写文件汇总

 1 String res = “”;
 2
 3 try{
 4
 5 InputStream in = getResources().openRawResource(R.raw.bbi);
 6
 7 //在\Test\res\raw\bbi.txt,
 8
 9 int length = in.available();
10
11 byte [] buffer = new byte[length];
12
13 in.read(buffer);
14
15 //res = EncodingUtils.getString(buffer, “UTF-8”);
16 
17 //res = EncodingUtils.getString(buffer, “UNICODE”);
18
19 res = EncodingUtils.getString(buffer, “BIG5”);
20
21 //依bbi.txt的编码类型选择合适的编码，如果不调整会乱码
22
23 in.close();
24
25 }catch(Exception e){
26
27 e.printStackTrace();
28
29 }

 1 String fileName = “yan.txt”; //文件名字
 2
 3 String res=””;
 4
 5 try{
 6
 7 InputStream in = getResources().getAssets().open(fileName);
 8
 9 // \Test\assets\yan.txt这里有这样的文件存在
10
11 int length = in.available();
12
13 byte [] buffer = new byte[length];
14
15 in.read(buffer);
16
17 res = EncodingUtils.getString(buffer, “UTF-8”);
18
19 }catch(Exception e){
20
21 e.printStackTrace();
22
23 }

 1 String fileName = “/sdcard/Y.txt”;
 2
 3 //也可以用String fileName = “mnt/sdcard/Y.txt”;
 4
 5 String res=””;
 6
 7 try{
 8
 9 FileInputStream fin = new FileInputStream(fileName);
10
11 //FileInputStream fin = openFileInput(fileName);
12 
13 //用这个就不行了，必须用FileInputStream
14
15 int length = fin.available();
16
17 byte [] buffer = new byte[length];
18
19 fin.read(buffer);
20
21 res = EncodingUtils.getString(buffer, “UTF-8”);
22
23 fin.close();
24
25 }catch(Exception e){
26
27 e.printStackTrace();
28
29 }
30
31 myTextView.setText(res);

 1 String fileName = “TEST.txt”;
 2
 3 String message = “FFFFFFF11111FFFFF” ;
 4
 5 writeFileData(fileName, message);
 6
 7 public voidwriteFileData(String fileName,String message){
 8
 9 try{
10
11 FileOutputStream fout =openFileOutput(fileName, MODE_PRIVATE);
12
13 byte [] bytes = message.getBytes();
14
15 fout.write(bytes);
16
17 fout.close();
18
19 }
20
21 catch(Exception e){
22
23 e.printStackTrace();
24
25 }
26
27 }

 1 //写文件在./data/data/com.tt/files/下面
 2
 3 public voidwriteFileData(String fileName,String message){
 4
 5 try{
 6
 7 FileOutputStream fout =openFileOutput(fileName, MODE_PRIVATE);
 8
 9 byte [] bytes = message.getBytes();
10
11 fout.write(bytes);
12
13 fout.close();
14
15 }
16
17 catch(Exception e){
18
19 e.printStackTrace();
20
21 }
22
23 }
24
25 //——————————————————-
26 
27 //读文件在./data/data/com.tt/files/下面
28
29 public String readFileData(String fileName){
30
31 String res=””;
32
33 try{
34
35 FileInputStream fin = openFileInput(fileName);
36
37 int length = fin.available();
38
39 byte [] buffer = new byte[length];
40
41 fin.read(buffer);
42
43 res = EncodingUtils.getString(buffer, “UTF-8”);
44
45 fin.close();
46
47 }
48
49 catch(Exception e){
50
51 e.printStackTrace();
52
53 }
54
55 return res;
56
57 }

 1 //写在/mnt/sdcard/目录下面的文件
 2
 3 public voidwriteFileSdcard(String fileName,String message){
 4
 5 try{
 6
 7 //FileOutputStream fout = openFileOutput(fileName, MODE_PRIVATE);
 8
 9 FileOutputStream fout = newFileOutputStream(fileName);
10
11 byte [] bytes = message.getBytes();
12
13 fout.write(bytes);
14
15 fout.close();
16
17 }
18
19 catch(Exception e){
20
21 e.printStackTrace();
22
23 }
24
25 }
26
27 //读在/mnt/sdcard/目录下面的文件
28
29 public String readFileSdcard(String fileName){
30
31 String res=””;
32
33 try{
34
35 FileInputStream fin = new FileInputStream(fileName);
36
37 int length = fin.available();
38
39 byte [] buffer = new byte[length];
40
41 fin.read(buffer);
42
43 res = EncodingUtils.getString(buffer, “UTF-8”);
44
45 fin.close();
46
47 }
48
49 catch(Exception e){
50
51 e.printStackTrace();
52
53 }
54
55 return res;
56
57 }