小编che*_*che的帖子

package com.example.root.myapplication;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;

import org.json.JSONArray;
import org.json.JSONException;

import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;

public class MainActivity extends AppCompatActivity {

    Button btnCommercial;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        final ListView list11 = (ListView) findViewById(R.id.listView1);
        ArrayList<String> authorities = getAuthorities("AuthorityList.json");
        final ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_dropdown_item, authorities);
        btnCommercial = (Button) findViewById(R.id.btnCommercial);
        btnCommercial.setOnClickListener(
                new View.OnClickListener() {
                    @Override
                    public void onClick(View view) {
                        list11.setAdapter(adapter);
                    }
                });
    }

    private ArrayList<String> …