java如何将“Data.Json”文件从资产保存到内部存储器,然后将其用于读/写
目前,我正在从资产的Json文件“Data.Json”中获取一个包的详细信息(Onnet分钟、Offnet分钟等),但我知道我们无法更改资产的值。所以我的问题是如何复制数据。json到内部存储,然后加载以进行读/写
我用这个来加载数据。来自资产的Json
public String loadJSONFromAsset() {
String json = null;
try {
InputStream is = getAssets().open("Data.json");
int size = is.available();
byte[] buffer = new byte[size];
is.read(buffer);
is.close();
json = new String(buffer, "UTF-8");
Toast.makeText(jazz_sim_lagao_offer_details.this, "JSON Loaded", Toast.LENGTH_SHORT).show();
} catch (IOException ex) {
ex.printStackTrace();
return null;
}
return json;
}
并使用此代码更新数据
private void UpdateData() {
JSONObject JSONobj = null;
try {
loadJSONFromAsset();
//get JSONObject from JSON file
JSONobj = new JSONObject(loadJSONFromAsset());
//fetch JSONObject named
JSONObject Jazz_SimLagaoOffer = JSONobj.getJSONObject("packages").getJSONObject("jazz_packages").getJSONObject("call_packages").getJSONObject("sim_lagao_offer");
String Jazz_SimLagaoOffer_ONNET = Jazz_SimLagaoOffer.getString("onnet");
Jazz_SimLagaoOffer_OnNet_TextView.setText(Jazz_SimLagaoOffer_ONNET);
String Jazz_SimLagaoOffer_OFFNET = Jazz_SimLagaoOffer.getString("offnet");
Jazz_SimLagaoOffer_OffNet_TextView.setText(Jazz_SimLagaoOffer_OFFNET);
String Jazz_SimLagaoOffer_MBs = Jazz_SimLagaoOffer.getString("mbs");
Jazz_SimLagaoOffer_Mb_TextView.setText(Jazz_SimLagaoOffer_MBs);
String Jazz_SimLagaoOffer_SMS = Jazz_SimLagaoOffer.getString("sms");
Jazz_SimLagaoOffer_Sms_TextView.setText(Jazz_SimLagaoOffer_SMS);
String Jazz_SimLagaoOffer_SUBCODE = Jazz_SimLagaoOffer.getString("sub_code");
Jazz_SimLagaoOffer_Sub_Code_TextView.setText(Jazz_SimLagaoOffer_SUBCODE);
String Jazz_SimLagaoOffer_CHECKCODE = Jazz_SimLagaoOffer.getString("check_code");
Jazz_SimLagaoOffer_Check_Code_TextView.setText(Jazz_SimLagaoOffer_CHECKCODE);
String Jazz_SimLagaoOffer_UNSUBCODE = Jazz_SimLagaoOffer.getString("unsub_code");
Jazz_SimLagaoOffer_Unsub_Code_TextView.setText(Jazz_SimLagaoOffer_UNSUBCODE);
Jazz_SimLagaoOffer_Charges = Jazz_SimLagaoOffer.getString("charges");
} catch (JSONException e) {
e.printStackTrace();
Toast.makeText(getBaseContext(), JSONobj + "", Toast.LENGTH_SHORT).show();
}
}
如何获取Json对象
这是我的数据。Json
{
"packages" : {
"jazz_packages" : {
"call_packages" : {
"sim_lagao_offer" : {
"charges" : "0.01",
"check_code" : "*551*2#",
"mbs" : "1500",
"offnet" : "5000",
"onnet" : "3000",
"sms" : "3000",
"sub_code" : "*551#",
"unsub_code" : "*551*3#"
}
}
}
}
}
# 1 楼答案
试试这个
使用下面的代码从存储器中读取
使用下面的方法从内部存储文件中读取数据并以字符串形式返回
}
希望这项工作:)
# 2 楼答案
经过一天的研究,感谢@pratik vekariya,我得到了自己问题的答案 帮了我很多
CopyAssets()的工作原理与@pratik vekariya在其答案中的定义一样完美,要阅读FromFile,请参阅我的问题loadJSONFromAssets() 我只是换了一条线
用这个
装载。从文件中获取json文件,并从inputStrem获取json对象