如何解析JSON并显示为活动?

时间:2015-06-19 12:33:08

标签: java android json

目标

我的Welcomescreen活动是欢迎屏幕,当用户点击按钮时,它会获取Google News并将JSON返回到DisplayMessageActivity,我想在这里显示JSON,就像精美的新闻Feed样式......

取得

到目前为止,我实现了获取JSON并使用Intent将响应移动到NewsFeed活动。现在该做什么。?

尝试:

我跟着Hooking Custom Layout to ListView,我在这里..他们的下一次会议是不同的,所以我没有跟进..

DisplayMessageActivity.java

public class DisplayMessageActivity extends ActionBarActivity {
    private ListView newsListView;
    //private String[] stringArray;
    private ArrayAdapter newsItemArrayAdapter;
    private static final String DEBUG_TAG = "HTTP";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_display_message);


        //newsItemArrayAdapter = new ArrayAdapter(DisplayMessageActivity.this, android.R.layout.simple_list_item_1, stringArray);
        newsItemArrayAdapter = new NewsAdapter(DisplayMessageActivity.this, new String[10]);
        newsListView = (ListView) findViewById(R.id.listViewId);
        newsListView.setAdapter(newsItemArrayAdapter);


        // Get the message from the intent
        //Intent intent = getIntent();
        //String message = intent.getStringExtra(WelcomescreenActivity.EXTRA_MESSAGE);
        //Log.d(DEBUG_TAG, "The response is: " + message);
        //setContentView(R.layout.activity_display_message);
    }

NewsAdapter.java

public class NewsAdapter extends ArrayAdapter{
    private LayoutInflater inflater;

    public NewsAdapter(Activity activity, String[] items){
        super(activity, R.layout.news_feed, items);
        inflater = activity.getWindow().getLayoutInflater();
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent){
        return inflater.inflate(R.layout.news_feed, parent, false);
    }
}

news_feed.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent" android:layout_height="match_parent">

    <TextView android:id="@+id/title"
        android:text="@string/news_title"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:textSize="19sp" />

</LinearLayout>

更新

搜索后我发现了这个How to parse JSON in Android答案......

尝试了,它抛出..

org.json.JSONException: Unterminated string at character 500 of {"responseData": {"results":[{"G

任何想法?

1 个答案:

答案 0 :(得分:0)

有关于此的数百个教程,但你应该尝试Gson。 您只需要创建一个包含要从Json解析的属性的类。所以用这样的课:

public class Data {
   private String name;
   private int age;

   public String getName() {
       return this.name;
   }

   public int getAge() {
       return this.age;
   }

   public void setName(String name) {
       this.name = name;
   }

   public void setAge(int age) {
       this.age = age;
   }
}

Json喜欢这样:

{
    "name": "whatever",
    "age": 21
}

你可以这样做:

public void setData(String jsonAsString) {
    final Gson gson = new GsonBuilder().create();
    final Data data = gson.fromJson(jsonAsString, Data.class);
    //And of course access your data like this
    String name = data.getName();
}

当然,您不必在课堂上拥有所有json变量。在这种情况下,仅使用变量name它就可以工作。

但当然,最好的帮助就是学会如何自己找到答案......