ListView数据没显示出来，也没报错，麻烦大家帮忙看看呗

曾小怪 2019-04-16 03:06:12

//main.xml



<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:orientation="vertical">



    <ListView

        android:id="@+id/lv_contact"

        android:layout_width="match_parent"

        android:layout_height="match_parent"/>

</LinearLayout>

//view_home.xml

<?xml version="1.0" encoding="utf-8"?>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:orientation="horizontal" >



    <LinearLayout

        android:id="@+id/ll"

        android:layout_width="match_parent"

        android:layout_height="80dp"

        android:gravity="center"

        android:orientation="vertical" >



        <TextView

            android:id="@+id/tv"

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:text="测试活动" />



        <TextView

            android:layout_marginTop="20dp"

            android:id="@+id/shijian"

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:text="测试时间" />

    </LinearLayout>



</RelativeLayout>

以上是我的两个xml布局文件

这里是Acticity

public class MainActivity extends AppCompatActivity implements View.OnClickListener {



    public ListView lv;

    public ArrayList<Map<String, Object>> list = new ArrayList<Map<String,Object>>();



    @Override

    protected void onCreate(@Nullable Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.main);

        init();

    }



    private void init(){

        list.clear();

        lv = (ListView) View.inflate(this,R.layout.main,null).findViewById(R.id.lv_contact);

        new Thread(new Runnable() {

            @Override

            public void run() {

                try {

                    OkHttpClient client = new OkHttpClient();

                    Request request = new Request

                            .Builder()

                            .url("http://120.36.153.174:9080/CargolistApi/select").build();

                    Response response = client.newCall(request).execute();

                    String responseData = response.body().string();

                    parseJSONWithJSONObject(responseData);

                }catch (Exception e){

                    e.printStackTrace();

                }

            }

        }).start();

    }



    private  void parseJSONWithJSONObject(String jsonData) {

        if (jsonData != null) {

             try {

                  JSONObject jsonObject = new JSONObject(jsonData);

                  String resultCode = jsonObject.getString("flag");

                     //如果返回的值是success则正确

                    if (resultCode.equals("success")) {

                        JSONArray resultJsonArray = jsonObject.getJSONArray("data");

                        Log.d("MainActivity","data+++"+resultJsonArray);  //数据是有获取到的

                        for (int i = 0; i < resultJsonArray.length(); i++) {

                            JSONObject Object = resultJsonArray.getJSONObject(i);

                            Map<String, Object> map = new HashMap<String, Object>();

                            try {

                                    String name = Object.getString("cargono");

                                    String shijian = Object.getString("variety");

                                    Log.d("MainActivity","name is:"+name);

                                    Log.d("MainActivity","shijian is"+shijian);



                                    map.put("cargono", name);

                                    map.put("variety", shijian);



                                    //ArrayList集合

                                    list.add(map);

                            }catch (Exception e) {

                                e.printStackTrace();

                            }

                        }



                        Message message = new Message();

                        message.what = 1;

                        handler.sendMessage(message);



                    }

            }catch (Exception e){

                    e.printStackTrace();

            }

        }

    }



    @SuppressLint("HandlerLeak")

    public Handler handler = new Handler() {



        @Override

        public void handleMessage(Message msg) {

            switch (msg.what) {

                case 1:

                    Mybaseadapter list_item = new Mybaseadapter();

                    lv.setAdapter(list_item);

                    break;

            }

       }

    };

适配器

public class Mybaseadapter extends BaseAdapter {



        @Override

        public int getCount() {

            return list.size();

        }



        @Override

        public Object getItem(int position) {

            return list.get(position);

        }



        @Override

        public long getItemId(int position) {

            return position;

        }



        @Override

        public View getView(int position, View convertView, ViewGroup parent) {



            ViewHolder viewHolder = null;

            if (convertView == null) {

                viewHolder = new ViewHolder();

                convertView = getLayoutInflater().inflate(R.layout.view_home,null);

                viewHolder.textView = (TextView) convertView.findViewById(R.id.tv);

                viewHolder.shijian = (TextView) convertView.findViewById(R.id.shijian);



                convertView.setTag(viewHolder);

            } else {

                viewHolder = (ViewHolder) convertView.getTag();

            }



            viewHolder.textView.setText(list.get(position).get("name").toString());

            viewHolder.shijian.setText(list.get(position).get("shijian").toString());

            return convertView;

        }

    }



    final static class ViewHolder {

        TextView textView;

        TextView shijian;

    }



    @Override

    public void onClick(View view) {



    }

}

这个是服务器端的json数据

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曾小怪 2019-04-18

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引用 26 楼优⃢ 的回复:

适配器的第四行的函数错了

按照15楼的方法修改，问题已经解决了哦，感谢大家

Felix_Fly2021 2019-04-17

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public class MainActivity extends AppCompatActivity implements View.OnClickListener { public ListView lv; public ArrayList<Map<String, Object>> list = new ArrayList<Map<String,Object>>(); @Override protected void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); init(); } private Mybaseadapter list_item; private void init(){ list.clear(); lv = (ListView)findViewById(R.id.lv_contact); list_item = new Mybaseadapter(); lv.setAdapter(list_item); new Thread(new Runnable() { @Override public void run() { try { OkHttpClient client = new OkHttpClient(); Request request = new Request .Builder() .url("http://120.36.153.174:9080/CargolistApi/select").build(); Response response = client.newCall(request).execute(); String responseData = response.body().string(); parseJSONWithJSONObject(responseData); }catch (Exception e){ e.printStackTrace(); } } }).start(); } private void parseJSONWithJSONObject(String jsonData) { if (jsonData != null) { try { JSONObject jsonObject = new JSONObject(jsonData); String resultCode = jsonObject.getString("flag"); //如果返回的值是success则正确 if (resultCode.equals("success")) { JSONArray resultJsonArray = jsonObject.getJSONArray("data"); Log.d("MainActivity","data+++"+resultJsonArray); //数据是有获取到的 for (int i = 0; i < resultJsonArray.length(); i++) { JSONObject Object = resultJsonArray.getJSONObject(i); Map<String, Object> map = new HashMap<String, Object>(); try { String name = Object.getString("cargono"); String shijian = Object.getString("variety"); Log.d("MainActivity","name is:"+name); Log.d("MainActivity","shijian is"+shijian); map.put("cargono", name); map.put("variety", shijian); //ArrayList集合 list.add(map); }catch (Exception e) { e.printStackTrace(); } } handler.sendEmptyMessageDelayed(1,100); } }catch (Exception e){ e.printStackTrace(); } } } @SuppressLint("HandlerLeak") public Handler handler = new Handler() { @Override public void handleMessage(Message msg) { switch (msg.what) { case 1: list_item.notifiDataSetChange(); break; } } }; //试试看这样子能行吗？我对你的代码做了一点修改 }

痞子わ戏子 2019-04-17

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有木有大佬知道怎么设计遥控控制

曾小怪 2019-04-17

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引用 15 楼 2018-Fly 的回复:

public class MainActivity extends AppCompatActivity implements View.OnClickListener { public ListView lv; public ArrayList<Map<String, Object>> list = new ArrayList<Map<String,Object>>(); @Override protected void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); init(); } private Mybaseadapter list_item; private void init(){ list.clear(); lv = (ListView)findViewById(R.id.lv_contact); list_item = new Mybaseadapter(); lv.setAdapter(list_item); new Thread(new Runnable() { @Override public void run() { try { OkHttpClient client = new OkHttpClient(); Request request = new Request .Builder() .url("http://120.36.153.174:9080/CargolistApi/select").build(); Response response = client.newCall(request).execute(); String responseData = response.body().string(); parseJSONWithJSONObject(responseData); }catch (Exception e){ e.printStackTrace(); } } }).start(); } private void parseJSONWithJSONObject(String jsonData) { if (jsonData != null) { try { JSONObject jsonObject = new JSONObject(jsonData); String resultCode = jsonObject.getString("flag"); //如果返回的值是success则正确 if (resultCode.equals("success")) { JSONArray resultJsonArray = jsonObject.getJSONArray("data"); Log.d("MainActivity","data+++"+resultJsonArray); //数据是有获取到的 for (int i = 0; i < resultJsonArray.length(); i++) { JSONObject Object = resultJsonArray.getJSONObject(i); Map<String, Object> map = new HashMap<String, Object>(); try { String name = Object.getString("cargono"); String shijian = Object.getString("variety"); Log.d("MainActivity","name is:"+name); Log.d("MainActivity","shijian is"+shijian); map.put("cargono", name); map.put("variety", shijian); //ArrayList集合 list.add(map); }catch (Exception e) { e.printStackTrace(); } } handler.sendEmptyMessageDelayed(1,100); } }catch (Exception e){ e.printStackTrace(); } } } @SuppressLint("HandlerLeak") public Handler handler = new Handler() { @Override public void handleMessage(Message msg) { switch (msg.what) { case 1: list_item.notifiDataSetChange(); break; } } }; //试试看这样子能行吗？我对你的代码做了一点修改 }

哦吼，可以了。嘻嘻

曾小怪 2019-04-17

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引用 15 楼 2018-Fly 的回复:

public class MainActivity extends AppCompatActivity implements View.OnClickListener { public ListView lv; public ArrayList<Map<String, Object>> list = new ArrayList<Map<String,Object>>(); @Override protected void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); init(); } private Mybaseadapter list_item; private void init(){ list.clear(); lv = (ListView)findViewById(R.id.lv_contact); list_item = new Mybaseadapter(); lv.setAdapter(list_item); new Thread(new Runnable() { @Override public void run() { try { OkHttpClient client = new OkHttpClient(); Request request = new Request .Builder() .url("http://120.36.153.174:9080/CargolistApi/select").build(); Response response = client.newCall(request).execute(); String responseData = response.body().string(); parseJSONWithJSONObject(responseData); }catch (Exception e){ e.printStackTrace(); } } }).start(); } private void parseJSONWithJSONObject(String jsonData) { if (jsonData != null) { try { JSONObject jsonObject = new JSONObject(jsonData); String resultCode = jsonObject.getString("flag"); //如果返回的值是success则正确 if (resultCode.equals("success")) { JSONArray resultJsonArray = jsonObject.getJSONArray("data"); Log.d("MainActivity","data+++"+resultJsonArray); //数据是有获取到的 for (int i = 0; i < resultJsonArray.length(); i++) { JSONObject Object = resultJsonArray.getJSONObject(i); Map<String, Object> map = new HashMap<String, Object>(); try { String name = Object.getString("cargono"); String shijian = Object.getString("variety"); Log.d("MainActivity","name is:"+name); Log.d("MainActivity","shijian is"+shijian); map.put("cargono", name); map.put("variety", shijian); //ArrayList集合 list.add(map); }catch (Exception e) { e.printStackTrace(); } } handler.sendEmptyMessageDelayed(1,100); } }catch (Exception e){ e.printStackTrace(); } } } @SuppressLint("HandlerLeak") public Handler handler = new Handler() { @Override public void handleMessage(Message msg) { switch (msg.what) { case 1: list_item.notifiDataSetChange(); break; } } }; //试试看这样子能行吗？我对你的代码做了一点修改 }

好的，感谢。我试试

曾小怪 2019-04-17

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引用 14 楼哈哈的bug 的回复:

题外话建议使用RecyclerView，先不说这个到底好在什么地方，现在也很少见到有用ListView 这个似乎更重要一点

是吗，哈哈哈哈哈哈，不是做安卓的所以有点不清楚，好的呢

咕咕鸡转致富宝噢 2019-04-17

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厉害了看晕

HpVIP 2019-04-17

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引用 11 楼无fucker说的回复:

用你的代码运行直接CRASH，你能成功运行？
viewHolder.textView.setText(list.get(position).get("name").toString());
viewHolder.shijian.setText(list.get(position).get("shijian").toString());

改成
viewHolder.textView.setText(list.get(position).get("cargono").toString());
viewHolder.shijian.setText(list.get(position).get("variety").toString());

list.get(position)是得到map对象，你要显示的是map<key，value>中的的value，value=map.get(key),里面是你的key--"cargono",
"variety"

厉害啦

曾小怪 2019-04-17

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引用 21 楼 weixin_44933334 的回复:

我看晕了

哈哈哈

weixin_44933334 2019-04-17

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我看晕了

哈哈的bug 2019-04-16

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题外话建议使用RecyclerView，先不说这个到底好在什么地方，现在也很少见到有用ListView 这个似乎更重要一点

曾小怪 2019-04-16

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[quote=引用 11 楼无fucker说的回复:] 我也是醉，用你的代码运行直接CRASH，你能成功运行？ viewHolder.textView.setText(list.get(position).get("name").toString()); viewHolder.shijian.setText(list.get(position).get("shijian").toString()); 改成 viewHolder.textView.setText(list.get(position).get("cargono").toString()); viewHolder.shijian.setText(list.get(position).get("variety").toString()); list.get(position)是得到map对象，你要显示的是map<key，value>中的的value，value=map.get(key),里面是你的key--"cargono", "variety" [/quo 不好意思，我的错，

曾小怪 2019-04-16

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引用 11 楼无fucker说的回复:

我也是醉，用你的代码运行直接CRASH，你能成功运行？ viewHolder.textView.setText(list.get(position).get("name").toString()); viewHolder.shijian.setText(list.get(position).get("shijian").toString()); 改成 viewHolder.textView.setText(list.get(position).get("cargono").toString()); viewHolder.shijian.setText(list.get(position).get("variety").toString()); list.get(position)是得到map对象，你要显示的是map<key，value>中的的value，value=map.get(key),里面是你的key--"cargono", "variety"

我这个有保存的鸭

雕·不懒惰 2019-04-16

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我也是醉，用你的代码运行直接CRASH，你能成功运行？
viewHolder.textView.setText(list.get(position).get("name").toString());
viewHolder.shijian.setText(list.get(position).get("shijian").toString());

改成
viewHolder.textView.setText(list.get(position).get("cargono").toString());
viewHolder.shijian.setText(list.get(position).get("variety").toString());

list.get(position)是得到map对象，你要显示的是map<key，value>中的的value，value=map.get(key),里面是你的key--"cargono",
"variety"

曾小怪 2019-04-16