Json 解析Android Studio

Question

我在尝试向手机显示JSON数据时遇到了这个问题

public class json extends ActionBarActivity {
TextView text1;

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


}

public void button1(View v) {
    new JsonTask().execute("http://microblogging.wingnity.com/JSONParsingTutorial/jsonActors");
}


public class JsonTask extends AsyncTask<String, String, String> {

    @Override
    protected String doInBackground(String... params) {
        HttpURLConnection connection = null;
        BufferedReader reader = null;
        String result = "";

        try {
            URL url = new URL(params[0]);
            connection = (HttpURLConnection) url.openConnection();
            connection.connect();
            InputStream stream = connection.getInputStream();
            reader = new BufferedReader(new InputStreamReader(stream));
            StringBuffer buffer = new StringBuffer();
            String line = "";
            while ((line = reader.readLine()) != null) {
                buffer.append(line);
            }
            result = buffer.toString();

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

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


        } finally {
            if (connection != null) {
                connection.disconnect();
            }
            try {
                if (reader != null) {
                    reader.close();
                }
            } catch (Exception e) {
                e.printStackTrace();
            }

        }
        return result;
    }



    @Override
    protected void onPostExecute(String result) {

        text1.setText(result);


    }
}

这是我的错误消息

9-29 11:28:24.657 29264-29264/com . example . window 8 . my friend D/Android runtime:正在关闭虚拟机09-29 11:28:24.657 29264-29264/com . example . window 8 . my friend W/dalvikvm:threadid = 1:线程退出，出现未捕获的异常(group=0x42050da0) 09-29管道仪表图:29264信号图:9

Answer 1

伙计们，我解决了。真正的问题是，我忘记初始化我的文本视图。我不敢相信我犯了如此愚蠢的错误(尝试其他任何方法来解决它)。谢谢你的帮助，很抱歉浪费了你的时间。

Answer 2

您需要在使用文本视图之前初始化它。

public class json extends ActionBarActivity {
TextView text1;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_json);
//you need to add this line
text1=(TextView)findViewById(R.id.yourTextviewId);
}

Answer 3

我想你还没有初始化textView变量。在onCreate（）内部初始化它。那么这个例外就不会出现了。希望能对你有所帮助。