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如何在Android Studio中将JSON数组从Laravel路由器传递到Android类

android-studio-3.0 lumen laravel json java

Ram Agrawal · 技术社区 · 8 年前

我是Android Studio的新手,想为Android Studio创建Lumen API,我创建了一个简单的Android项目,从lumen web.php文件中获取数组项列表,并将其显示为xml listview。我工作得很好。我的问题是,我创建了一个简单的LaravelLumenAPI,在该API中,当URL被点击时,它会转到Lumen项目的web.php,并用一个数组返回json响应。我的web.php文件如下:

$router->get('/demo',function(){
		 $array = User::get();//variable array contain all users data
		return response()->json($array);
});

我的主要活动如下:

package com.example.ram.myapplication;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import retrofit2.Call;
import retrofit2.Callback;
import retrofit2.Response;
import retrofit2.Retrofit;
import retrofit2.converter.gson.GsonConverterFactory;

public class MainActivity extends AppCompatActivity {
    ListView listView;

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

        listView = (ListView) findViewById(R.id.listViewHeroes);

        //calling the method to display the heroes
        getHeroes();
    }

    private void getHeroes() {
        Retrofit retrofit = new Retrofit.Builder()
                .baseUrl(Api.BASE_URL)
                .addConverterFactory(GsonConverterFactory.create()) //Here we are using the GsonConverterFactory to directly convert json data to object
                .build();

        Api api = retrofit.create(Api.class);

        Call<List<Hero>> call = api.getHeroes();

        call.enqueue(new Callback<List<Hero>>() {
            @Override
            public void onResponse(Call<List<Hero>> call, Response<List<Hero>> response) {

                List<Hero> heroList = response.body();

                //Creating an String array for the ListView
                String[] heroes = new String[heroList.size()];

                //looping through all the heroes and inserting the names inside the string array
                for (int i = 0; i < heroList.size(); i++) {
                    heroes[i] = heroList.get(i).getName();
                }


                //displaying the string array into listview
                listView.setAdapter(new ArrayAdapter<String>(getApplicationContext(), android.R.layout.simple_list_item_1, heroes));

            }

            @Override
            public void onFailure(Call<List<Hero>> call, Throwable t) {
                Toast.makeText(getApplicationContext(), t.getMessage(), Toast.LENGTH_SHORT).show();
            }
        });
    }

}

我希望在XML列表视图中显示此数组,但它在Emulator上显示的错误为: “应为begin_数组,但在第1行第2列路径$处为begin_对象。”

请帮助我如何使用Android Studio处理JSON响应

1 回复 | 直到 8 年前

rkj 8 年前

试试这个

$router->get('/demo',function(){
         $heroes = [
                   ['name' => 'mahesh'],  //this associative array represent your Android `Hero` mapping class
                   ['name' => 'vishal'],
                  ]
        return response()->json($heroes);
});

如果要从数据库中提取数据,可以这样做

$heroes = User::all();

或

$heroes = User::where(...)->get();