Java 错误：org.json.JSONArray无法转换为JSONObject

我不断地犯这个错误。我发现错误

JSONArray

无法转换为

JSONObject

。我已经解析了包含对象数组的JSON文件，但是仍然得到了这个错误。代码如下：

JAVA代码：

public class DetailActivity extends AppCompatActivity {

ImageView imageView;
TextView options, bio, noBio;
private final String JSON_URL = "https://run.mocky.io/v3/987b97bd-6895-40d1-9d37-ce404162c491";
private JsonObjectRequest jsonObjectRequest;
private RequestQueue requestQueue;
@SuppressLint("SetTextI18n")
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_detail);
    getSupportActionBar().setTitle("");
    getSupportActionBar().setDisplayShowHomeEnabled(true);
    getSupportActionBar().setDisplayHomeAsUpEnabled(true);

    imageView = (ImageView) findViewById(R.id.iv_image);
    options = (TextView) findViewById(R.id.tv_options);
    bio = (TextView) findViewById(R.id.tv_bio);
    noBio = (TextView) findViewById(R.id.tv_no_bio);

    getDetails();
}

private void getDetails() {
    jsonObjectRequest = new JsonObjectRequest(Request.Method.GET, JSON_URL,null ,new Response.Listener<JSONObject>() {
        @RequiresApi(api = Build.VERSION_CODES.KITKAT)
        @Override
        public void onResponse(JSONObject response) {
            try {
                JSONArray jsonArray = new JSONArray(response.toString());
                for (int i = 0; i<jsonArray.length(); i++){
                    JSONObject jsonObject = jsonArray.getJSONObject(i);
                    String type = jsonObject.getString("type");
                    boolean isVisible = jsonObject.getBoolean("isVisible");

                    if (!isVisible){
                        imageView.setVisibility(View.GONE);
                        options.setText("API response is false. So data will not be shown.");
                        bio.setText("API response is false. So data will not be shown.");
                    }
                    else{
                        imageView.setVisibility(View.VISIBLE);
                        options.setVisibility(View.VISIBLE);
                        bio.setVisibility(View.VISIBLE);

                        Intent intent = getIntent();
                        Glide.with(getApplicationContext()).load((Bitmap) intent.getParcelableExtra("image")).into(imageView);
                        options.setText("Choosen Option : " + getIntent().getStringExtra("options"));
                        String str_bio = getIntent().getStringExtra("comments");
                        if (str_bio == null){
                            bio.setVisibility(View.GONE);
                            noBio.setVisibility(View.VISIBLE);
                        }
                        else{
                            bio.setText("Bio : " + str_bio);
                            noBio.setVisibility(View.GONE);
                        }
                    }
                }
            } catch (JSONException e) {
                Toast.makeText(DetailActivity.this, e.getMessage(), Toast.LENGTH_SHORT).show();
                Log.d("Exception", e.getMessage());
            }
        }
    }, new Response.ErrorListener() {
        @Override
        public void onErrorResponse(VolleyError error) {
            Toast.makeText(DetailActivity.this, error.getMessage(), Toast.LENGTH_SHORT).show();
            Log.d("Error", error.getMessage());
        }
    });
    requestQueue = Volley.newRequestQueue(DetailActivity.this);
    requestQueue.add(jsonObjectRequest);
}

[
   {
      "type":"PHOTO",
      "isVisible":true
   },
   {
      "type":"SINGLE_CHOICE",
      "isVisible":true
   },
   {
      "type":"COMMENT",
      "isVisible":true
   }
]

---

编写如下代码来提取JSON：

从服务器获取响应后的Java文件代码：

     String json_string = "[ {type:PHOTO, isVisible:true }, { type:SINGLE_CHOICE, isVisible:true }, { type:COMMENT, isVisible:true } ]";

        try {
            JSONArray jsonArray = new JSONArray(json_string);

            for (int i = 0; i < jsonArray.length(); i++) {
                JSONObject obj = jsonArray.getJSONObject(i);
                String type = obj.getString("type");
                boolean isVisible = obj.getBoolean("isVisible");

                Log.e("json", "type ::" + type);
                Log.e("json", "isVisible ::" + isVisible);
            }


        } catch (JSONException e) {

            Log.e("Json error", "onCreate:" + e.getMessage());
        }

---

您能发布logcat tht指示错误吗？logcat中没有显示错误。我只在上面加上了截击错误。哪一行？。在你的帖子上，你有一个log

log.d（“Error”，Error.getMessage（））

还可以让您像这样捕获

catch（Throwable e）

并像这样打印

e.printStackTrace（）

您正在生成一个

JsonObjectRequest

但是响应是一个json数组，使用

JsonArrayRequest

     String json_string = "[ {type:PHOTO, isVisible:true }, { type:SINGLE_CHOICE, isVisible:true }, { type:COMMENT, isVisible:true } ]";

        try {
            JSONArray jsonArray = new JSONArray(json_string);

            for (int i = 0; i < jsonArray.length(); i++) {
                JSONObject obj = jsonArray.getJSONObject(i);
                String type = obj.getString("type");
                boolean isVisible = obj.getBoolean("isVisible");

                Log.e("json", "type ::" + type);
                Log.e("json", "isVisible ::" + isVisible);
            }


        } catch (JSONException e) {

            Log.e("Json error", "onCreate:" + e.getMessage());
        }

2020-11-28 11:50:08.806 22296-22296/com.googlehomeapp.ansstackoverflow01 E/json: type ::PHOTO
2020-11-28 11:50:08.806 22296-22296/com.googlehomeapp.ansstackoverflow01 E/json: isVisible ::true
2020-11-28 11:50:08.807 22296-22296/com.googlehomeapp.ansstackoverflow01 E/json: type ::SINGLE_CHOICE
2020-11-28 11:50:08.807 22296-22296/com.googlehomeapp.ansstackoverflow01 E/json: isVisible ::true
2020-11-28 11:50:08.807 22296-22296/com.googlehomeapp.ansstackoverflow01 E/json: type ::COMMENT
2020-11-28 11:50:08.807 22296-22296/com.googlehomeapp.ansstackoverflow01 E/json: isVisible ::true