一、 从resource中的raw文件夹中获取文件并读取数据(资源文件只能读不能写)
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 }
myTextView.setText(res);//把得到的内容显示在TextView上
二、 从asset中获取文件并读取数据(资源文件只能读不能写)
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 }
三、 从sdcard中去读文件,首先要把文件通过\android-sdk-windows\tools\adb.exe把本地计算机上的文件copy到sdcard上去,adb.exe push e:/Y.txt /sdcard/, 不可以用adb.exe push e:\Y.txt \sdcard\ 同样: 把仿真器上的文件copy到本地计算机上用: adb pull ./data/data/com.tt/files/Test.txt e:/
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);
四、 写文件, 一般写在\data\data\com.test\files\里面,打开DDMS查看file explorer是可以看到仿真器文件存放目录的结构的
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 }
五、 写, 读data/data/目录(相当AP工作目录)上的文件,用openFileOutput
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 }
六、 写, 读sdcard目录上的文件,要用FileOutputStream, 不能用openFileOutput
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 }
注: openFileOutput是在raw里编译过的,FileOutputStream是任何文件都可以
Android读写文件汇总 http://www.ziyouku.com/archives/android-to-read-and-write-file-summary.html