Question

我想显示从newsapi到textview的重新调谐的json数据的标题。有正确的方法吗？返回每篇文章的标题，我知道这一点，因为在for循环Log.i（“ Titles，title）内将所需的标题输出到logcat。我只需要以某种方式将它们转换为textviews或任何允许用户执行以下操作的方法查看标题。亲切的问候，罗布。

public class quotesPage extends AppCompatActivity {

    String FactsUrl;
    Button goButton;
    TextView displayBox;
    String [] array;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_quotes_page);



        goButton = findViewById(R.id.button1);
        displayBox = findViewById(R.id.textView4);

        goButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v)
            {
                FactsUrl = "https://newsapi.org/v2/top-headlines?country=gb&category=health&apiKey=2b3d6472849543e4a908f43cf5c77410";
                //displayBox.setText("THIS IS JUST A TEST ");
                new quotesPage.AsyncHttpTask().execute(FactsUrl);
            }
        });

    }
    public class AsyncHttpTask extends AsyncTask<String, Void, String>
    {

        @Override
        protected String doInBackground(String... urls)
        {
            String result = "";
            URL url;
            HttpURLConnection urlConnection = null;

            try {
                url = new URL (urls[0]);
                urlConnection = (HttpURLConnection) url.openConnection();
                String response = streamToString(urlConnection.getInputStream());
                parseResult(response);
                return result;


            } catch (Exception e) {
                e.printStackTrace();
            }

            return null;
        }
    }

    String streamToString(InputStream stream) throws IOException
    {
        BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(stream));
        String data;
        String result = "";

        while ((data = bufferedReader.readLine()) != null)
        {
            result += data;
        }
        if (null != stream)
        {
            stream.close();
        }

        return result;

    }

    public void parseResult(String result)
    {
        JSONObject response = null;
        try {
            response = new JSONObject(result);
            JSONArray articles = response.optJSONArray("articles");

            for (int i = 0; i < articles.length(); i++)
            {
                JSONObject article = articles.optJSONObject(i);
                String title = article.optString("title");
                Log.i("Titles", title);
            }

        } catch (Exception e) {
            e.printStackTrace();
        }

    }


}

activity_quotes_page.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@android:color/holo_orange_dark"
    tools:context=".quotesPage">

    <LinearLayout
        android:id="@+id/linearLayout1"
        android:layout_width="match_parent"
        android:layout_height="445dp"
        android:orientation="vertical">

        <TextView
            android:id="@+id/textView3"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:fontFamily="@font/baloo"
            android:text="Click the GO! button to see uk health news headlines!"
            android:textAlignment="center"
            android:textColor="@android:color/black"
            android:textSize="24sp" />

        <Button
            android:id="@+id/button1"
            android:layout_width="100dp"
            android:layout_height="wrap_content"
            android:layout_marginLeft="130dp"
            android:layout_marginRight="130dp"
            android:background="?attr/colorButtonNormal"
            android:fontFamily="@font/baloo"
            android:text="Go!"
            android:textSize="24sp"
            android:visibility="visible" />

        <TextView
            android:id="@+id/textView4"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="TextView" />

    </LinearLayout>

    <LinearLayout
        android:id="@+id/linearLayout2"
        android:layout_width="344dp"
        android:layout_height="62dp"
        android:orientation="horizontal"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.5"
        app:layout_constraintStart_toStartOf="parent">

        <ImageButton
            android:id="@+id/imageButton1"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:background="@android:color/holo_orange_dark"
            app:srcCompat="@drawable/leftarrowlarge" />

        <ImageButton
            android:id="@+id/imageButton3"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:background="@android:color/holo_orange_dark"
            app:srcCompat="@drawable/timerlarge" />

        <ImageButton
            android:id="@+id/imageButton2"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:background="@android:color/holo_orange_dark"
            app:srcCompat="@drawable/rightarrowlarge" />
    </LinearLayout>

</android.support.constraint.ConstraintLayout>

id喜欢做的事情是在“ parseResult” for循环中做到这一点：

displayBox.append（displayBox + title）;

Answer 1

Rob

进行api调用并使用json响应的行业标准是使用翻新，并获取对象作为结果。一旦学习了如何使用它，您将永远不会使用asyntask和自己解析json。

这是一个很好的tutorial方法。

Answer 2

我通常创建一个用于轻松解析和使用网络数据的模型。

function allowDrop(ev) 
{
  ev.preventDefault();
}

function drag(ev) 
{
  ev.dataTransfer.setData("text", ev.target.id);
}

function drop(ev) 
{
  ev.preventDefault();
  var data = ev.dataTransfer.getData("text"); // ID of the incoming dragged             element


  if(ev.target.childElementCount==0)
  {
    ev.target.appendChild(document.getElementById(data));
    for(var i=0;i<func_list[parseInt(data)].length;i++)
    {
        var exp=document.createElement("div");
        exp.setAttribute("id", data.concat("exp"));
        exp.setAttribute("ondrop","drop(event)");
        exp.setAttribute("ondragover","allowDrop(event)");
        exp.setAttribute("class","Expression_Area");
        ev.target.appendChild(exp);
    }
  }

  else
  {
      var item = ev.target;
      while (item.firstChild) 
      {
        item.removeChild(item.firstChild);
      }
      ev.target.appendChild(document.getElementById(data));
    for(var i=0;i<func_list[parseInt(data)].length;i++)
    {
        var exp=document.createElement("div");
        exp.setAttribute("id", data.concat("exp"));
        exp.setAttribute("ondrop","drop(event)");
        exp.setAttribute("ondragover","allowDrop(event)");
        exp.setAttribute("class","Expression_Area");
        ev.target.appendChild(exp);
    }

  }



}

现在根据需要显示列表视图或回收站视图。

如何显示TextView的JSON对象？任何建议将不胜感激

2 个答案: