json存储数据存储数据gson读取数据读取数据
用as模拟QQ登录界面，用json存储数据gson读取数据
xml文件
package com.example.mysaveqq;
import android.content.Context;
import android.content.SharedPreferences;
import android.widget.Toast;
import com.google.gson.Gson;
import com.google.gson.reflect.TypeToken;
import org.json.JSONException;
import org.json.JSONObject;
import java.io.BufferedWriter;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintStream;
import java.io.UnsupportedEncodingException;
import java.lang.reflect.Type;
import java.util.HashMap;
import java.util.Map;
import static android.content.Context.MODE_PRIVATE;
import static java.lang.System.out;
public class SPsaveQQ {
public static boolean saveUserInfo(Context context, String account, String password) throws JSONException {
// SharedPreferences sp=context.getSharedPreferences("data",context.MODE_PRIVATE);
//// SharedPreferences.Editor edit=sp.edit();
//// edit.putString("useName",account);
//// edit.putString("pwd",password);
//// edit.commit();
JSONObject jsonObject=new JSONObject();
jsonObject.put("useName",account);
jsonObject.put("pwd",password);
try {
FileOutputStream out1=context.openFileOutput("qq.json",context.MODE_PRIVATE);
try {
out1.write(jsonObject.toString().getBytes());
} catch (IOException e) {
e.printStackTrace();
}
} catch (FileNotFoundException e) {
e.printStackTrace();
}
return true;
}
public static MapgetUserInfo(Context context,InputStream is) throws IOException {
// SharedPreferences sp=context.getSharedPreferences("data",Context.MODE_PRIVATE);
// String account=sp.getString("useName",null);
// String password=sp.getString("pwd",null);
// MapuserMap =new HashMap();
// userMap.put("account",account);
// userMap.put("password",password);
byte[] buffer=new byte[is.available()];
is.read(buffer);
String json =new String(buffer,"utf-8");
is.close();
Gson gson=new Gson();
Type type=new TypeToken< Map>(){}.getType();
Map userMap=gson.fromJson(json,type);
return userMap;
}
}
创建json对象
JSONObject jsonObject=new JSONObject();
jsonObject.put(“useName”,account);
jsonObject.put(“pwd”,password);
用gson解析
Gson gson=new Gson();
Type type=new TypeToken< Map>(){}.getType();
Map userMap=gson.fromJson(json,type);
主函数
package com.example.mysaveqq;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.service.autofill.SaveInfo;
import android.text.TextUtils;
import android.view.View;
import android.widget.Button;
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