获取assets,res,内部存储,外部存储

//外部存储路径
Environment.getExternalStorageDirectory();

//assets文件读取流
getResources().getAssets().open(fileName);

//res资源路径下文件的读取流
getResources().openRawResource(R.raw.test);

//应用程序内部存储文件读取和写入流
openFileInput(name);
openFileOutput(name, mode);
<pre name="code" class="java">//获取assets文件夹里，某个文件的读取流

<span style="font-family: monospace; white-space: pre; background-color: rgb(240, 240, 240);">//--------------------------------------------------------------------------------------------------------------------------------------------
</span><pre name="code" class="java">//获取assets文件夹里，某个文件的读取流
try{InputStream is = getResources().getAssets().open("mydemo.txt");

//用转换流将字节转换成字符流，并指定字符编码

InputStreamReader isr = new InputStreamReader(is, "utf-8");

//将字符流装饰一下BufferedReader br = new BufferedReader(isr);

//缓冲String line = "";

//循环读取while ((line = br.readLine()) != null){

System.out.println(line);

}

} catch (IOException e){e.printStackTrace();}

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

//读取res资源目录下，文件夹内的数据

try{InputStream is = getResources().openRawResource(R.raw.mydemo);

InputStreamReader isr = new InputStreamReader(is,"utf-8");

BufferedReader br = new BufferedReader(isr);String line = "";

while ((line = br.readLine()) != null){System.out.println(line);}} catch (IOException e){e.printStackTrace();}

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

//应用程序内部文件的读写操作try{//获取应用程序内部文件写入流

FileOutputStream fos = openFileOutput(fileName,Context.MODE_PRIVATE);

//转换OutputStreamWriter osw = new OutputStreamWriter(fos,"utf-8");

//包装BufferedWriter bw = new BufferedWriter(osw);

bw.write(et.getText().toString());

bw.close();

osw.close();

fos.close();

Toast.makeText(this, "成功", Toast.LENGTH_SHORT).show();

} catch (FileNotFoundException e){e.printStackTrace();} catch (UnsupportedEncodingException e){e.printStackTrace();} catch (IOException e){e.printStackTrace();}
<pre name="code" class="java">//--------------------------------------------------------------------------------------------------------------------------------------------

<span style="font-family: monospace; white-space: pre; background-color: rgb(240, 240, 240);">//</span>获取应用程序内部读取流

try{FileInputStream fis = openFileInput(fileName);

//转换InputStreamReader isr = new InputStreamReader(fis,"utf-8");

//包装BufferedReader br = new BufferedReader(isr);

//缓冲

String line = "";

//获取的数据

String data = "";

while((line = br.readLine()) != null){

data += line;

}

br.close();

isr.close();

fis.close();

tv.setText(data);

} catch (FileNotFoundException e){e.printStackTrace();} catch (IOException e){e.printStackTrace();}

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