Question

我想创建一个用户可以输入单词并输入字母的应用程序，应用程序将计算单词中使用该字母的次数。这是我的代码

public class LetterCount extends Activity {

    Button CountLetter;
    TextView Result;
    EditText WordCount;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.lettercounter);

        Button CountLetter = (Button) findViewById(R.id.btncount);

        CountLetter.setOnClickListener(new View.OnClickListener() {
            //Declaring The Id in Xml    
            @Override
            public void onClick(View v) {
                TextView Result = (TextView) findViewById(R.id.numberletter);
                EditText WordCount = (EditText) findViewById(R.id.txtletter);
                String input =  WordCount.getText().toString();

                EditText Letter = (EditText) findViewById(R.id.txtletter);
                Char lettercount = Letter.getText();

                //loop for counting the letter in Word
                int charCount = 0;
                for(int i =0 ; i<input.length(); i++){
                    if(input.charAt(i) == lettercount){
                        charCount++;
                    }
                }
               //Displaying the result in Text View
               Result.setText(charCount);
            }
        });
    }
}

但单击按钮时应用程序停止工作。我该如何解决这个问题？

Answer 1

您正在查找视图 txtletter 两次。相反，请使用另一个EditText，用户可以输入他们想要计算的字符，例如 letter

所以视图现在将是

EditText Letter = (EditText) findViewById(R.id.letter);

此外，如果要在textview中显示循环结果，请将其转换为字符串，而不是将int转换为字符串。

            EditText Letter = (EditText) findViewById(R.id.letter); //user will enter which character they want to count
            char lettercount = Letter.getText().toString().charAt(0); //read the character

            //loop for counting the letter in Word
            int charCount = 0;
            for(int i =0 ; i<input.length(); i++){
                if(input.charAt(i) == lettercount){
                    charCount++;
                }
            }
           //Displaying the result in Text View
           Result.setText(charCount + ""); //convert to string before passing to setText

android Eclipse Count在Word用户中输入用户字母输入显示到textview结果

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