Android读写文件

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）

String res ="";

try{

InputStream in =getResources().openRawResource(R.raw.bbi);

//在\Test\res\raw\bbi.txt,

intlength = in.available();

byte[] buffer =newbyte[length];

in.read(buffer);

//res = EncodingUtils.getString(buffer, "UTF-8");

//res = EncodingUtils.getString(buffer, "UNICODE");

res = EncodingUtils.getString(buffer,"BIG5");

//依bbi.txt的编码类型选择合适的编码，如果不调整会乱码

in.close();

}catch(Exception e){

e.printStackTrace();

}

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）

String fileName ="yan.txt";//文件名字

String res="";

try{

InputStream in = getResources().getAssets().open(fileName);

//\Test\assets\yan.txt这里有这样的文件存在

intlength = in.available();

byte[] buffer =newbyte[length];

in.read(buffer);

res = EncodingUtils.getString(buffer,"UTF-8");

}catch(Exception e){

e.printStackTrace();

}

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:/

String fileName ="/sdcard/Y.txt";

//也可以用String fileName ="mnt/sdcard/Y.txt";

String res="";

try{

FileInputStream fin =newFileInputStream(fileName);

//FileInputStream fin =openFileInput(fileName);

//用这个就不行了，必须用FileInputStream

intlength = fin.available();

byte[] buffer =newbyte[length];

fin.read(buffer);

res = EncodingUtils.getString(buffer,"UTF-8");

fin.close();

}catch(Exception e){

e.printStackTrace();

}

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

String fileName ="TEST.txt";

String message ="FFFFFFF11111FFFFF";

writeFileData(fileName, message);

publicvoidwriteFileData(String fileName,String message){

try{

FileOutputStream fout =openFileOutput(fileName,MODE_PRIVATE);

byte[] bytes = message.getBytes();

fout.write(bytes);

fout.close();

}

catch(Exception e){

e.printStackTrace();

}

}

五、写，读data/data/目录(相当AP工作目录)上的文件，用openFileOutput

//写文件在./data/data/com.tt/files/下面

publicvoidwriteFileData(String fileName,String message){

try{

FileOutputStream fout =openFileOutput(fileName,MODE_PRIVATE);

byte[] bytes = message.getBytes();

fout.write(bytes);

fout.close();

}

catch(Exception e){

e.printStackTrace();

}

}

//-------------------------------------------------------

//读文件在./data/data/com.tt/files/下面

publicString readFileData(String fileName){

String res="";

try{

FileInputStream fin = openFileInput(fileName);

intlength = fin.available();

byte[] buffer =newbyte[length];

fin.read(buffer);

res = EncodingUtils.getString(buffer,"UTF-8");

fin.close();

}

catch(Exception e){

e.printStackTrace();

}

returnres;

}

六、写，读sdcard目录上的文件，要用FileOutputStream，不能用openFileOutput

//写在/mnt/sdcard/目录下面的文件

publicvoidwriteFileSdcard(String fileName,String message){

try{

//FileOutputStreamfout = openFileOutput(fileName, MODE_PRIVATE);

FileOutputStream fout =newFileOutputStream(fileName);

byte[] bytes = message.getBytes();

fout.write(bytes);

fout.close();

}

catch(Exception e){

e.printStackTrace();

}

}

//读在/mnt/sdcard/目录下面的文件

publicString readFileSdcard(String fileName){

String res="";

try{

FileInputStream fin =new FileInputStream(fileName);

intlength = fin.available();

byte[] buffer =newbyte[length];

fin.read(buffer);

res = EncodingUtils.getString(buffer,"UTF-8");

fin.close();

}

catch(Exception e){

e.printStackTrace();

}

returnres;

}

注： openFileOutput是在raw里编译过的，FileOutputStream是任何文件都可以

参考：http://dev.10086.cn/cmdn/wiki/index.php?doc-view-6017.html