Question

我想显示我使用列表视图从API获取的联系人。但是当我要运行它时，它被强制关闭。当我尝试查看我创建的日志时，响应之外的usernamefriendprofile数组为null。否则，usernamefriendprofile数组的响应中将包含一个值。如果我将阵列适配器作为响应，则会收到类似

的错误

无法解析构造函数'ArrayAdapter（匿名com.androidnetworking.interfaces JSONObject RequestListener，int，int，java.util.ArrayList）

kind: Pod
metadata:
name: gradlecommandfromcommandline
labels:
purpose: gradlecommandfromcommandline
spec:
volumes:
- name: docker-sock
  hostPath:
    path: /home/vagrant/k8s/pods/gatling/user-files/simulations    # A file or 
directory location on the node that you want to mount into the Pod
  #  command: [ "git clone https://github.com/TarunKDas2k18/PerfGatl.git" ]
containers:
- name: gradlecommandfromcommandline
  image: tarunkumard/tarungatlingscript:v1.0
  workingDir: /opt/gatling-fundamentals/
  command: ["./gradlew"]
  args: ["gatlingRun-simulations.RuntimeParameters", "-DUSERS=500", "- 
 DRAMP_DURATION=5", "-DDURATION=30"]

- name: gatlingperftool
  image: tarunkumard/gatling:FirstScript     # Run the ubuntu 16.04
  command: [ "/bin/bash", "-c", "--" ]       # You need to run some task inside a 
  container to keep it running
  args: [ "while true; do sleep 10; done;" ] # Our simple program just sleeps inside 
  an infinite loop
  volumeMounts:
    - mountPath: /opt/gatling/user-files/simulations     # The mount path within the 
  container
      name: docker-sock                   # Name must match the hostPath volume name
  ports:
    - containerPort: 80

有人知道如何解决吗？

Answer 1

@Josep所说的更改此内容

JSONObject obj = new JSONObject(String.valueOf(response));

至：

JSONObject obj = new JSONObject(response.toString());

并移动此块：

arrayAdapter = new ArrayAdapter<String>(this,R.layout.activity_listview,R.id.usernameTeman,usernameFriendsProfile);
teman.setAdapter(arrayAdapter);

到onResponse方法的结尾。

您正在异步获取数据，因此onResponse中的代码将在适配器初始化后执行。

Answer 2

尝试稍微更改类变量：

ArrayList<String> usernameFriendsProfile = null;
ArrayAdapter<String> arrayAdapter = null;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    tokenUser= getIntent().getStringExtra("token");
    Log.d(TAG, "tokenmainactivity" + tokenUser); //untuk log pada onerror
    Log.d(TAG, "tokenhalamanselanjutnya " + tokenUser);
    username = (TextView) findViewById (R.id.user);
    usernameFriends = (TextView)findViewById(R.id.usernameTeman);
    teman=(ListView)findViewById(R.id.teman);

    // initialize the ArrayList here
    usernameFriendsProfile = new ArrayList<String>();

    arrayAdapter = new ArrayAdapter<String>(this,R.layout.activity_listview,R.id.usernameTeman,usernameFriendsProfile);
    teman.setAdapter(arrayAdapter);
    initData();
    Log.d(TAG, "usernametemendiluar : " + usernameFriendsProfile);
}

我将Adapter设为类变量。但是，您还可以采用其他方法。

然后在响应中通知Adapter数据已更新：

public void onResponse(JSONObject response){
    Log.d(TAG, "onResponse: " + response); //untuk log pada onresponse
    try {
        String usernameAkun = response.getString("username");
        username.setText(usernameAkun);
        Log.d(TAG, "namaprofil : " + username);

        JSONArray friends = response.getJSONArray("friends");

        for (int i=0;i<friends.length();i++){
            JSONObject objek = friends.getJSONObject(i);
            usernameFriendsProfile.add(objek.getString("username"));
        }
        // notify the adapter that the data has been updated
        arrayAdapter.notifyDataSetChanged();

        Log.d(TAG, "usernametemendidalem : " + usernameFriendsProfile);
    } catch (JSONException e) {
        e.printStackTrace();
    }
}

Answer 3

您应该使用

JSONObject obj = new JSONObject(response.toString());

代替

JSONObject obj = new JSONObject(String.valueOf(response));

在创建JSONObject时。

无法使listview它说数组为空

3 个答案: