1.讀取asset目錄下json檔案並轉成bean

InputStream is=getResources().getAssets().open("xxxx.json");
ByteArrayOutputStream baos=new ByteArrayOutputStream();
byte[] bytes=new byte[1024];
int length;
while((length=is.read(bytes))!=-1){
    baos.write(bytes,0,length);
}
return new Gson().<ArrayList<SubTab>>fromJson(new 
 
String(baos.toByteArray(),"UTF-8"),new TypeToken<ArrayList<SubTab>>(){}.getType());

2.讀取本地檔案並轉換成bean

byte[] bytes=new byte[1024];
int length;
ByteArrayOutputStream baos=new ByteArrayOutputStream();
InputStream is;
File file=getContext().getFileStreamPath("xxx.json");
if (file.exists()){
    is=getContext().openFileInput("xxx.json"
 
);
}else {
    is=getResources().getAssets().open("xxx.json");
}
while ((length=is.read(bytes))!=-1){
    baos.write(bytes,0,length);
}
return new Gson().<ArrayList<SubTab>>fromJson(new String(baos.toByteArray(),"UTF-8"),new TypeToken<ArrayList<SubTab>>(){}.getType());

3.將檔案寫在本地檔案中
 

String json = new Gson().toJson(activeTabs);
try {
    FileOutputStream fos = getContext().openFileOutput("xxx.json",
            Context.MODE_PRIVATE);
    fos.write(json.getBytes("UTF-8"));
    fos.flush();
    fos.close();
} catch (Exception e) {
    e.printStackTrace();
}