Question

我正在开发一个简单的应用程序来收集有关股票的最新信息。我正在应用AsyncTask并且我已经构建了我的GUI但是在我将Edit股票符号输入到EditText之后似乎没有任何事情发生。非常感谢任何帮助。我试过谷歌搜索这些主题，看看文档和教程，但不知道我错过了什么。我大约2个月的时间学习android开发。

这是我的代码：

package cornez.com.stockquotes;

import android.content.Context;
import android.graphics.Bitmap;
import android.os.AsyncTask;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.WindowManager;
import android.view.inputmethod.EditorInfo;
import android.view.inputmethod.InputMethodManager;
import android.widget.EditText;
import android.widget.TextView;

import java.io.IOException;

public class MainActivity extends AppCompatActivity {

    EditText editText;
    String symbol;
    TextView symbolText;

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

        TextView nameText, tradePriceText, tradeTimeText, changeText, rangeText;

        symbolText = (TextView) findViewById(R.id.symbolText);
        nameText = (TextView) findViewById(R.id.nameText);
        tradePriceText = (TextView) findViewById(R.id.tradePriceText);
        tradeTimeText = (TextView) findViewById(R.id.tradeTimeText);
        changeText= (TextView) findViewById(R.id.changeText);
        rangeText = (TextView) findViewById(R.id.rangeText);


        editText = (EditText) findViewById(R.id.editText);
        editText.setOnEditorActionListener(new TextView.OnEditorActionListener()
        {
            @Override
            public boolean onEditorAction(TextView v, int actionId,
                                          KeyEvent event)
            {
                if (actionId == EditorInfo.IME_ACTION_DONE)
                {
                    // actions when "Done" key is pressed

                    InputMethodManager imm = (InputMethodManager)v.getContext().getSystemService(Context.INPUT_METHOD_SERVICE);
                    imm.hideSoftInputFromWindow(v.getWindowToken(), 0);
                    return true;

                }
                return false;
            }
        });



        editText.requestFocus();
        getWindow().setSoftInputMode(WindowManager.LayoutParams.
                SOFT_INPUT_STATE_VISIBLE);

        getStockInfoTask stockTask = new getStockInfoTask();
        symbol = editText.getText().toString();
        stockTask.execute(symbol);


    }

    //AsyncTask
    private class getStockInfoTask extends AsyncTask<String, Void, Stock>
    {

        protected Stock doInBackground(String... params)
        {
            Stock stock = new Stock(symbol);
            try {
                stock.load();
            } catch (IOException e) {
                e.printStackTrace();
            }

            return stock;
        }

        protected void onPostExecute(Stock stock)
        {
            symbolText.setText(stock.getSymbol());
        }
    }



}

Answer 1

中的代码
```
onEditorAction
```

在新线程中运行。

代码

symbol = editText.getText().toString();

运行同步。

所以：

    editText.setOnEditorActionListener(new TextView.OnEditorActionListener()
    {
        @Override
        public boolean onEditorAction(TextView v, int actionId,
                                      KeyEvent event)
        {
            if (actionId == EditorInfo.IME_ACTION_DONE)
            {
                // actions when "Done" key is pressed

                InputMethodManager imm = (InputMethodManager)v.getContext().getSystemService(Context.INPUT_METHOD_SERVICE);
                imm.hideSoftInputFromWindow(v.getWindowToken(), 0);

                getStockInfoTask stockTask = new getStockInfoTask();
                symbol = editText.getText().toString();
                stockTask.execute(symbol);

                return true;
            }
            return false;
        }
    });



    editText.requestFocus();
    getWindow().setSoftInputMode(WindowManager.LayoutParams.
            SOFT_INPUT_STATE_VISIBLE);

AndroidDev：股票应用程序的AsyncTask - 什么都没发生

1 个答案: