android - 传递变量以通过 Android 项目使用

Question

我正在尝试传递在我项目的这一部分中设置的变量“stockSymbol”...

ticker.setText("Stock Ticker is: " + stockSymbol);

对我项目的这一部分具有相同的值(value)...

final String yqlURL = yahooURLFirst + stockSymbol + yahooURLSecond;

这是完整的代码...

String stockSymbol = "";

...

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_stock_info);

    stock = (EditText) findViewById(R.id.stock);
    ticker = (TextView) findViewById(R.id.ticker);
    btnquote = (Button) findViewById(R.id.btnquote);
    btnquote.setOnClickListener(new OnClickListener() {

        public void onClick(View v) {
            // get the name from edittext and storing into string variable
            String stockSymbol = stock.getText().toString();

           // binding name to the textview
           ticker.setText("Stock Ticker is: " + stockSymbol);
       }
    });

    // Initialize TextViews
    companyNameTextView = (TextView) findViewById(R.id.companyNameTextView);
    yearLowTextView = (TextView) findViewById(R.id.yearLowTextView);
    yearHighTextView = (TextView) findViewById(R.id.yearHighTextView);
    daysLowTextView = (TextView) findViewById(R.id.daysLowTextView);
    daysHighTextView = (TextView) findViewById(R.id.daysHighTextView);
    lastTradePriceOnlyTextView = (TextView) findViewById(R.id.lastTradePriceOnlyTextView);
    changeTextView = (TextView) findViewById(R.id.changeTextView);
    daysRangeTextView = (TextView) findViewById(R.id.daysRangeTextView);

    // Sends a message to the LogCat
    Log.d(TAG, "Before URL Creation " + stockSymbol);

    // Create the YQL query
    final String yqlURL = yahooURLFirst + stockSymbol + yahooURLSecond;

Answer 1

这是一个常见的范围问题。您在 onClick 方法中声明了一个新的 StockSymbol 字符串。要解决此问题，只需更改行

String stockSymbol = stock.getText().toString();

到

stockSymbol = stock.getText().toString();