android在editText上应用函数

时间：2012-06-30 14:04:21

标签： android

我有一个EditText，并且对于每个lettle用户输入这个editText我想在EditText中对整个文本应用一个函数，那个函数是因为我用阿拉伯语写的并且阿拉伯语的lettle看起来不好，但是当我使用Farsi class它变好了，如果用户想要输入21，我会给你一个简单的例子，我想应用函数output=3*editText.getText(); 因此，当他输入1时，我将应用该函数，因此将出现在editText上的resutl是：

output = 3*1 = 3

当他输入2时，我想显示12*3 = 36

编辑

06-30 12:30:38.547: E/AndroidRuntime(276): FATAL EXCEPTION: main
06-30 12:30:38.547: E/AndroidRuntime(276): java.lang.StackOverflowError
06-30 12:30:38.547: E/AndroidRuntime(276):  at android.text.DynamicLayout.reflow(DynamicLayout.java:261)
06-30 12:30:38.547: E/AndroidRuntime(276):  at android.text.DynamicLayout.<init>(DynamicLayout.java:150)
06-30 12:30:38.547: E/AndroidRuntime(276):  at android.widget.TextView.makeNewLayout(TextView.java:4851)
06-30 12:30:38.547: E/AndroidRuntime(276):  at android.widget.TextView.checkForRelayout(TextView.java:5348)
06-30 12:30:38.547: E/AndroidRuntime(276):  at android.widget.TextView.setText(TextView.java:2688)
06-30 12:30:38.547: E/AndroidRuntime(276):  at android.widget.TextView.setText(TextView.java:2556)
06-30 12:30:38.547: E/AndroidRuntime(276):  at android.widget.EditText.setText(EditText.java:75)
06-30 12:30:38.547: E/AndroidRuntime(276):  at android.widget.TextView.setText(TextView.java:2531)
06-30 12:30:38.547: E/AndroidRuntime(276):  at com.localizedbasedcompetition.AnswerQuestion$3.onTextChanged(AnswerQuestion.java:149)
06-30 12:30:38.547: E/AndroidRuntime(276):  at android.widget.TextView.sendOnTextChanged(TextView.java:6131)
06-30 12:30:38.547: E/AndroidRuntime(276):  at android.widget.TextView.setText(TextView.java:2691)
06-30 12:30:38.547: E/AndroidRuntime(276):  at android.widget.TextView.setText(TextView.java:2556)
06-30 12:30:38.547: E/AndroidRuntime(276):  at android.widget.EditText.setText(EditText.java:75)
06-30 12:30:38.547: E/AndroidRuntime(276):  at android.widget.TextView.setText(TextView.java:2531)
06-30 12:30:38.547: E/AndroidRuntime(276):  at com.localizedbasedcompetition.AnswerQuestion$3.onTextChanged(AnswerQuestion.java:149)
06-30 12:30:38.547: E/AndroidRuntime(276):  at android.widget.TextView.sendOnTextChanged(TextView.java:6131)
06-30 12:30:38.547: E/AndroidRuntime(276):  at android.widget.TextView.setText(TextView.java:2691)
06-30 12:30:38.547: E/AndroidRuntime(276):  at android.widget.TextView.setText(TextView.java:2556)
06-30 12:30:38.547: E/AndroidRuntime(276):  at android.widget.EditText.setText(EditText.java:75)
06-30 12:30:38.547: E/AndroidRuntime(276):  at android.widget.TextView.setText(TextView.java:2531)
06-30 12:30:38.547: E/AndroidRuntime(276):  at com.localizedbasedcompetition.AnswerQuestion$3.onTextChanged(AnswerQuestion.java:149)
06-30 12:30:38.547: E/AndroidRuntime(276):  at android.widget.TextView.sendOnTextChanged(TextView.java:6131)
06-30 12:30:38.547: E/AndroidRuntime(276):  at android.widget.TextView.setText(TextView.java:2691)
06-30 12:30:38.547: E/AndroidRuntime(276):  at android.widget.TextView.setText(TextView.java:2556)
06-30 12:30:38.547: E/AndroidRuntime(276):  at android.widget.EditText.setText(EditText.java:75)
06-30 12:30:38.547: E/AndroidRuntime(276):  at android.widget.TextView.setText(TextView.java:2531)
06-30 12:30:38.547: E/AndroidRuntime(276):  at com.localizedbasedcompetition.AnswerQuestion$3.onTextChanged(AnswerQuestion.java:149)
06-30 12:30:38.547: E/AndroidRuntime(276):  at android.widget.TextView.sendOnTextChanged(TextView.java:6131)
06-30 12:30:38.547: E/AndroidRuntime(276):  at android.widget.TextView.setText(TextView.java:2691)
06-30 12:30:38.547: E/AndroidRuntime(276):  at android.widget.TextView.setText(TextView.java:2556)
06-30 12:30:38.547: E/AndroidRuntime(276):  at android.widget.EditText.setText(EditText.java:75)
06-30 12:30:38.547: E/AndroidRuntime(276):  at android.widget.TextView.setText(TextView.java:2531)
06-30 12:30:38.547: E/AndroidRuntime(276):  at com.localizedbasedcompetition.AnswerQuestion$3.onTextChanged(AnswerQuestion.java:149)
06-30 12:30:38.547: E/AndroidRuntime(276):  at android.widget.TextView.sendOnTextChanged(TextView.java:6131)
06-30 12:30:38.547: E/AndroidRuntime(276):  at android.widget.TextView.setText(TextView.java:2691)
06-30 12:30:38.547: E/AndroidRuntime(276):  at android.widget.TextView.setText(TextView.java:2556)
06-30 12:30:38.547: E/AndroidRuntime(276):  at android.widget.EditText.setText(EditText.java:75)
06-30 12:30:38.547: E/AndroidRuntime(276):  at android.widget.TextView.setText(TextView.java:2531)
06-30 12:30:38.547: E/AndroidRuntime(276):  at com.localizedbasedcompetition.AnswerQuestion$3.onTextChanged(AnswerQuestion.java:149)
06-30 12:30:38.547: E/AndroidRuntime(276):  at android.widget.TextView.sendOnTextChanged(TextView.java:6131)
06-30 12:30:38.547: E/AndroidRuntime(276):  at android.widget.TextView.setText(TextView.java:2691)
06-30 12:30:38.547: E/AndroidRuntime(276):  at android.widget.TextView.setText(TextView.java:2556)
06-30 12:30:38.547: E/AndroidRuntime(276):  at android.widget.EditText.setText(EditText.java:75)
06-30 12:30:38.547: E/AndroidRuntime(276):  at android.widget.TextView.setText(TextView.java:2531)
06-30 12:30:38.547: E/AndroidRuntime(276):  at com.localizedbasedcompetition.AnswerQuestion$3.onTextChanged(AnswerQuestion.java:149)
06-30 12:30:38.547: E/AndroidRuntime(276):  at android.widget.TextView.sendOnTextChanged(TextView.java:6131)
06-30 12:30:38.547: E/AndroidRuntime(276):  at android.widget.TextView.setText(TextView.java:2691)
06-30 12:30:38.547: E/AndroidRuntime(276):  at android.widget.TextView.setText(TextView.java:2556)
06-30 12:30:38.547: E/AndroidRuntime(276):  at android.widget.EditText.setText(EditText.java:75)
06-30 12:30:38.547: E/AndroidRuntime(276):  at android.widget.TextView.setText(TextView.java:2531)
06-30 12:30:38.547: E/AndroidRuntime(276):  at com.localizedbasedcompetition.AnswerQuestion$3.onTextChanged(AnswerQuestion.java:149)
06-30 12:30:38.547: E/AndroidRuntime(276):  at android.widget.TextView.sendOnTextChanged(TextView.java:6131)
06-30 12:30:38.547: E/AndroidRuntime(276):  at android.widget.TextView.setText(TextView.java:2691)
06-30 12:30:38.547: E/AndroidRuntime(276):  at android.widget.TextView.setText(TextView.java:2556)
06-30 12:30:38.547: E/AndroidRuntime(276):  at android.widget.EditText.setText(EditText.java:75)
06-30 12:30:38.547: E/AndroidRuntime(276):  at android.widget.TextView.setText(TextView.java:2531)
06-30 12:30:38.547: E/AndroidRuntime(276):  at com.localizedbasedcompetition.AnswerQuestion$3.onTextChanged(AnswerQuestion.java:149)
06-30 12:30:38.547: E/AndroidRuntime(276):  at android.widget.TextView.sendOnTextChanged(TextView.java:6131)
06-30 12:30:38.547: E/AndroidRuntime(276):  at android.widget.TextView.setText(TextView.java:2691)
06-30 12:30:38.547: E/AndroidRuntime(276):  at android.widget.TextView.setText(TextView.java:2556)
06-30 12:30:38.547: E/AndroidRuntime(276):  at android.widget.EditText.setText(EditText.java:75)
06-30 12:30:38.547: E/AndroidRuntime(276):  at android.widget.TextView.setText(TextView.java:2531)
06-30 12:30:38.547: E/AndroidRuntime(276):  at com.localizedbasedcompetition.AnswerQuestion$3.onTextChanged(AnswerQuestion.java:149)
06-30 12:30:38.547: E/AndroidRuntime(276):  at android.widget.TextView.sendOnTextChang

4 个答案:

答案 0 :(得分：3)

您必须使用addTextChangedListener()和TextWatcher，如下所示：

tv = (TextView) findViewById(R.id.tv);
textMessage = (EditText) findViewById(R.id.tvMessage);
textMessage.addTextChangedListener(new TextWatcher(){
    public void afterTextChanged(Editable s) {
        //do your function here
    }
    public void beforeTextChanged(CharSequence s, int start, int count, int after){}
    public void onTextChanged(CharSequence s, int start, int before, int count){}
});

答案 1 :(得分：2)

EditText editText = (EditText)findViewById(R.id.editText);
    editText.addTextChangedListener(new TextWatcher() {
        @Override
        public void afterTextChanged(Editable s) {
            // TODO Auto-generated method stub
        }
        @Override
        public void beforeTextChanged(CharSequence s, int start, int count, int after) {
            // TODO Auto-generated method stub
        }
        @Override
        public void onTextChanged(CharSequence s, int start, int before, int count) {
        try
        {
         String s1 = editText.Text.ToString();
         byte[] b = s.getBytes("UTF-8");
         String s2 = new String(b, "UTF-8");
          editText.Text=(s2);
        }
        catch(Exception e)
        {}
        } 
    });

答案 2 :(得分：1)

fileNameEditText.setOnKeyListener(new View.OnKeyListener() {
    @Override
    public boolean onKey(View v, int keyCode, KeyEvent event) {
        // TODO Auto-generated method stub
        return false;
    }
});

为您的视图设置一个关键监听器。

答案 3 :(得分：1)

检查一下：TextView.OnEditorActionListener editText.setOnEditorActionListener（yourListener）

编辑：哦，我正在快速回答。当然，使用TextWatcher的答案是正确的方法。

相关问题
最新问题