Android应用程序将只显示一个JSON元素

Question

04-24 23:24:29.782 8144-8589/com.webdesigners.stockmarketW/System.err：android.view.ViewRootImpl$CalledFromWrongThreadExctive：只有创建视图层次结构的原始线程才能触摸其视图。04-24 23:24:29.783 8144-8589/com.webdesigners.stockmarketW/System.err：android.view.ViewRootImpl.check线程（ViewRootImpl.java:6357）04-24 23:24:29.783 8144-8589/com.webdesigners.stockmarketW/System.err：在android.view.ViewRootImpl.invalidateChildIn家长（ViewRootImpl.java:909）04-24 23:24:29.783 8144-8589/com.webdesigners.stockmarketW/System.err：在android.view.ViewGroup.invalidate儿童（ViewGroup.java:4690）04-24 23:24:29.783 8144-8589/com.webdesigners.stockmarketW/System.err： at android. view.无效内部（View. java： 11801）04-24 23:24:29.783 8144-8589/com. webDesigners. stock Market W/System. err： at android. view.无效（View. java： 11765）04-24 23:24:29.783 8144-8589/com. webDesigners. stock Market W/System. err： at android. view.view.无效（View. java： 11749）04-24 23:24:29.783 8144-8589/com. webDesigners. stock Market W/System. err： at android. idget. TextView. check ForRelayout（TextView. java： 6850）04-24 23:24:29.783 8144-8589/com. webDesigners. stock Market W/System. err： at android. idget. TextView. setText（TextView. java： 4057）04-24 23:24:29.783 8144-8589/com. webDesigners. stock Market W/System. err： at android. Widget. TextView. setText（TextView. java： 3915）04-24 23:24:29.783 8144-8589/com. webDesigners. stock Market W/System. err： at android. Widget.TextView. setText（TextView. java： 3890）04-24 23:24:29.784 8144-8589/com. webDesigners. stock Market W/System. err： at com. webDesigners. stock Market. MainActivity1 Dollar1 Dollar1 Dollar1 Dollar1. onReader（MainActivity. java： 74）04-24 23:24:29.784 8144-8589/com. webDesigners. stock Market W/System. err： at okhttp p3. RealCall$AsyncCall.执行（RealCall. java： 133）04-24 23:24:29.784 8144-8589/com. webDesigners. stock Market W/System. err： at okhttp p3. interal.NamedRunnable. run（NamedRunnable. java： 32）04-24 23:24:29.784 8144-8589/com. webDesigners. stock Market W/System. err： at java. utili. con电流. ThreadPoolExecutor. runWorker（ThreadPoolExecutor. java： 1112）04-24 23:24:29.784 8144-8589/com. webDesigners. stock Market W/System. err： at java. utili. con电流. ThreadPoolExecitor$Worker. run（ThreadPoolExecutor. java： 587）04-24 23:24:29.784 8144-8589/com. webDesigners. stock Market W/System. err： at java. lang. Thread. run（Thread. java： 818）

        searchButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            String userSymbol = searchEditText.getText().toString();

            try
            {
                OkHttpClient client = new OkHttpClient();
                Request request = new Request.Builder().url("http://query.yahooapis.com/v1/public/yql?q=select%20*%20from%20yahoo.finance.quotes%20where%20symbol%20in%20%28%22" + userSymbol + "%22%29&env=store://datatables.org/alltableswithkeys&format=json").build();
                client.newCall(request).enqueue(new Callback() {
                    @Override
                    public void onFailure(Call call, IOException e) {
                        e.printStackTrace();
                    }

                    @Override
                    public void onResponse(Call call, final Response response) throws IOException {
                        if (!response.isSuccessful())
                        {

                        }
                        else
                        {
                            String responseData = response.body().string();
                            try
                            {
                                TextView symbol = (TextView)findViewById(R.id.symbol);
                                TextView change = (TextView)findViewById(R.id.change);

                                //get object at "quote" level where most attributes are
                                JSONObject jsonObject = new JSONObject(responseData);
                                JSONObject query = jsonObject.getJSONObject("query");
                                JSONObject results = query.getJSONObject("results");
                                JSONObject quote = results.getJSONObject("quote");

                                Long changeValue = quote.getLong("Change");
                                String changeString = Long.toString(changeValue);
                                assert change != null;
                                change.setText(changeString);

                                assert symbol != null;
                                String companyName = quote.getString("Name");
                                String companyNameConcat = "Name: " + companyName;
                                symbol.setText(companyNameConcat);

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

            }
        }
    });

Answer 1

Long changeValue = quote.getLong("Change");
String changeString = Long.toString(changeValue);
assert change != null;
change.setText(changeString);

//将上述代码更改为

assert change != null;
String changeValue = quote.getString("Change");
change.setText(changeValue);

存储更改为String，将其检索为String并转换为Long

Answer 2

之后的

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

在那里放一个for循环。例如：

for (int i = 0; i < 2; i++) {
// Code here
}

Answer 3

您的回调不在主线程上执行。这就是您看到错误的原因。当您需要更新用户界面时，请调用runOnUiThread。