Question

我确实通过http读取数据，但我无法将此数据分配给TextView。

当我在xml文件中创建TextView时，数据被分配到normal。但是当我以编程方式创建TextView时，文本为空。

public class News extends Activity
{
    TextView myText;
    TextView title1;
    String s = "";

    @SuppressLint({ "NewApi", "ResourceAsColor" }) @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.news);

        StrictMode.enableDefaults();

        int textId1 = 1;
        int textId2 = 2;

        title1 = new TextView(this);
        title1.setText("Заголовок новости 1  -  2013.01.01\n\nСегодня состоится заседание зампредпал тра та та");
        title1.setTextColor(getResources().getColor(R.color.colorWihte));
        title1.setShadowLayer(2, 0, 0,getResources().getColor(R.color.colorBlack));
        title1.setBackground(getResources().getDrawable(R.drawable.round_block));
        title1.setId(textId1);

        RelativeLayout.LayoutParams layoutParams1 = new RelativeLayout.LayoutParams(
        RelativeLayout.LayoutParams.WRAP_CONTENT,
        RelativeLayout.LayoutParams.WRAP_CONTENT);
        layoutParams1.addRule(RelativeLayout.ALIGN_PARENT_TOP);
        layoutParams1.addRule(RelativeLayout.ALIGN_PARENT_LEFT);
        layoutParams1.addRule(RelativeLayout.ALIGN_PARENT_RIGHT);
        title1.setLayoutParams(layoutParams1);
        ((ViewGroup) findViewById(R.id.newslayout)).addView(title1);

        String result = "";
        InputStream isr = null;

        try
        {
            HttpClient client = new DefaultHttpClient();
            HttpPost post = new HttpPost("http://test.ivanov-vladimir.com/get_content.php");
            HttpResponse response = client.execute(post);
            HttpEntity entity = response.getEntity();
            isr = entity.getContent();
        }
        catch(Exception e)
        {
            Log.e("log_tag", "HTTP connect error " + e.toString());
        }

        try
        {
            BufferedReader reader = new BufferedReader(new InputStreamReader(isr, "utf-8"), 8);
            StringBuilder builder = new StringBuilder();
            String line = null;

            while((line = reader.readLine()) != null)
            {
                builder.append(line + "\n");
            }

            isr.close();
            result = builder.toString();
        }
        catch(Exception e)
        {
            Log.e("log_tag", "Data converting error " + e.toString());
        }

        try
        {
            JSONArray jarray = new JSONArray(result);

            for(int i = 0; i < jarray.length(); i++)
            {
                JSONObject json = jarray.getJSONObject(i);
                s = "Title: " + json.getString("title") + "\n\nContent: " + json.getString("content");
            }
        }
        catch(Exception e)
        {
            Log.e("log_tag", "Data parsing error " + e.toString());
        }

        title1.setText(s);
    }
}

现在我正在尝试为元素title1分配数组 jarray的最后一个值。

我在YouTube上的视频教程中获得了此代码。

如果你去一个网址http://test.ivanov-vladimir.com/get_content.php会打印符号，因为数据库中的文字是西里尔文。

Answer 1

首先，尝试避免UI线程中的网络操作等长时间操作，这会降低您的应用程序速度。

然后，尝试获取TextView值并记录它以查看是否为TextView分配了值：

Log.v("TextView value", title1.getText().toString());

然后，您还可以尝试从Web服务中记录内容下载：

while((line = reader.readLine()) != null)
{
    builder.append(line + "\n");
    Log.v("line", line);
}

请提供日志结果。

Android，无法为TextView赋值

1 个答案: