错误：应为 BEGIN_ARRAY，但为 BEGIN_OBJECT答案

【问题标题】：Error: Expected BEGIN_ARRAY but was BEGIN_OBJECT错误：应为 BEGIN_ARRAY，但为 BEGIN_OBJECT
【发布时间】：2016-05-29 14:20:35
【问题描述】：

进程：com.example.venky.httpurl1，PID：2578 java.lang.RuntimeException：com.google.gson.JsonSyntaxException：java.lang.IllegalStateException：应为 BEGIN_ARRAY，但在第 1 行第 3 列路径 $[0]
处为 BEGIN_OBJECT

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    listView = (ListView) findViewById(R.id.rtlist);
    client = new AsyncHttpClient();
    client.get(MainActivity.this, url, new com.loopj.android.http.AsyncHttpResponseHandler() {
        @Override
        public void onSuccess(int statusCode, cz.msebera.android.httpclient.Header[] headers, byte[] responseBody) {
            String responsestr = new String(responseBody);
            gson = new Gson();
            responseObj = gson.fromJson(responsestr, Response.class);
            adapter = new CustomAdapter(MainActivity.this, responseObj);
            listView.setAdapter(adapter);
        }

请输入任何内容？是因为我的 JSON 数据吗？？

【问题讨论】：

标签： android-studio android gson

【解决方案1】：

在将responseBody 转换为字符串并将其解析为JSON 值之前检查是否为NULL 或Empty

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    listView = (ListView) findViewById(R.id.rtlist);
    client = new AsyncHttpClient();
    client.get(MainActivity.this, url, new com.loopj.android.http.AsyncHttpResponseHandler() {
        @Override
        public void onSuccess(int statusCode, cz.msebera.android.httpclient.Header[] headers, byte[] responseBody) {
            if(responseBody != null && responseBody.length > 0) {
                String responsestr = new String(responseBody);
                gson = new Gson();
                responseObj = gson.fromJson(responsestr, Response.class);
                adapter = new CustomAdapter(MainActivity.this, responseObj);
                listView.setAdapter(adapter);
            }
        }

【讨论】：