我正在尝试读取JSON文件以将其转换为Java对象但我收到错误。此JSON响应代码来自API。这是我的主要活动。这是我第一次提出问题所以请帮助我。
package com.example.ahsan.jsontogson;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
import com.google.gson.Gson;
import com.google.gson.JsonElement;
import java.io.FileReader;
import java.util.List;
public class MainActivity extends AppCompatActivity {
public static final String TAG = MainActivity.class.getSimpleName();
public static final String mPath = "Json.txt";
private QuoteBank mQuoteBank;
private List<String> mLines;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
Gson gson = new Gson();
// 1. i am getting error on this line source file is not located error
QuoteBank staff = gson.fromJson(new FileReader("D:\\JSON.txt"), QuoteBank.class);
// 2. JSON to Java object, read it from a Json String.
String jsonInString = "{'name' : 'mkyong'}";
Staff staff = gson.fromJson(jsonInString, Staff.class);
// JSON to JsonElement, convert to String later.
JsonElement json = gson.fromJson(new FileReader("D:\\file.Json"), JsonElement.class);
String result = gson.toJson(json);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
答案 0 :(得分:4)
原因是您尝试从桌面/笔记本电脑上的设备读取该文件。
QuoteBank staff = gson.fromJson(new FileReader("D:\\JSON.txt"), QuoteBank.class); //D drive path
你不能以任何方式这样做。 该文件应存在于设备外部存储目录中的某个位置。