Question

我正在尝试使用来自JSON API的数据创建一个非常简单的列表视图。我对Android很新，并且遇到了许多非常不同且复杂的解决方案，这些解决方案对我不起作用。这是JSON数据的示例，我希望列出名称，并在单击每个名称时显示它们，它显示一个显示其余值的页面。

{
    "results": [
    {
      "name": "Luke Skywalker",
      "height": "172",
      "mass": "77",
      "hair_color": "blond",
      "skin_color": "fair",
      "eye_color": "blue",
      "birth_year": "19BBY",
      "gender": "male",
      "image": "https://loremflickr.com/320/240?lock=1"
    },
    {
      "name": "C-3PO",
      "height": "167",
      "mass": "75",
      "hair_color": "n/a",
      "skin_color": "gold",
      "eye_color": "yellow",
      "birth_year": "112BBY",
      "gender": "n/a",
      "image": "https://loremflickr.com/320/240?lock=2"
    },
}

这是我的代码：

public class MainActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        ListView myListView = (ListView) findViewById(R.id.listView1);
        try
        {
          **//  String jsonInput = "[\"one\",\"two\",\"three\",\"four\",\"five\",\"six\",\"seven\",\"eight\",\"nine\",\"ten\"]";
            JSONObject jsonInput;
            jsonInput = new JSONObject("http://public.duethealth.com/api/project.json");
            JSONArray jsonArray = new JSONArray(jsonInput);
            int length = jsonArray.length();
            List<String> listContents = new ArrayList<String>(length);
            for (int i = 0; i < length; i++)
            {
                listContents.add(jsonArray.getString(i));
            }
            myListView.setAdapter(new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, listContents));
        }
        catch (Exception e)
        {
            e.setStackTrace();
        }**


        FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
        fab.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
                        .setAction("Action", null).show();
            }
        });
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }
}

我的代码在onCreate（）中，当我将JSON读作字符串（注释掉的行）时，它似乎有效。

ScreenShot

我似乎不明白如何从URL读取JSON对象，然后从该Object读取数组，然后将该数组中的每个对象打印到我的listview中。我理解它背后的逻辑，但是我对android尝试编码它是如此陌生，这让我很难受。我已经看过很长的解析方法和东西，但似乎解决方案应该像单行一样简单（只需从url读取）。谁能看到我的问题在哪里？

谢谢！

Json从URL到listview

0 个答案: