Android中读取文件中文乱码

try {
InputStream file= getApplicationContext().getAssets().open("text.json");
InputStreamReader inputStreamReader=new InputStreamReader(file,"GB2312");

//根据文件的相应编码指定，"GB2312"、"UTF-8"

inputStreamReader.toString();
BufferedReader bufferedReader=new BufferedReader(inputStreamReader);
String line="";
String all=null;
while ((line=bufferedReader.readLine())!=null){
all=all+line;
Log.e("qwe",line);
}
} catch (IOException e) {
e.printStackTrace();
}