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EditText 输入字数限制

2024-11-02 00:22:02   205人阅读

Editext 输入字数显示工具类
标签： Android

[1].[代码] [Java]代码 跳至 [1]

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publicclass InputLengthControler {
    privateEditText mEditText;
    privateTextView mHintTextView;
    privatefinal String hint_remain_count = "您还可以输入%s字";
    privatefinal String hint_max_length_msg = "最多只能输入%s字";
    privateint MAX_LENGTH = 140;
 
    publicvoid config(EditText inputBox, intmaxLength, TextView lengthHintView) {
        MAX_LENGTH = maxLength;
        mEditText = inputBox;
        mHintTextView = lengthHintView;
        mEditText.addTextChangedListener(watcher);
        updateLengthHint(MAX_LENGTH);
    }
 
    privateTextWatcher watcher = newTextWatcher() {
 
        @Override
        publicvoid onTextChanged(CharSequence s, intstart, intbefore,
                intcount) {
 
        }
 
        @Override
        publicvoid beforeTextChanged(CharSequence s, intstart, intcount,
                intafter) {
 
        }
 
        @Override
        publicvoid afterTextChanged(Editable s) {
            if(mEditText.getText().length() > MAX_LENGTH) {
                String str = mEditText.getText().toString();
                if(str != null&& str.length() > 10) {
                    str = str.substring(0, MAX_LENGTH);
                    mEditText.setText(str);
                    mEditText.setSelection(str.length());
                }
                toast(String.format(hint_max_length_msg, MAX_LENGTH));
            }
            intenableCount = MAX_LENGTH;
            Editable curContent = mEditText.getText();
            if(curContent != null&& curContent.length() > 0) {
                enableCount = MAX_LENGTH - curContent.length();
            }
            updateLengthHint(enableCount);
        }
    };
 
    privatevoid updateLengthHint(intenableCount) {
        if(enableCount < 0) {
            enableCount = 0;
        }elseif (enableCount > MAX_LENGTH) {
            enableCount = MAX_LENGTH;
        }
        mHintTextView.setText(String.format(hint_remain_count, enableCount));
    }
 
    privatevoid toast(String msg) {
        Context context;
        if(msg != null&& (context = getContext()) != null) {
            Toast.makeText(context, msg, Toast.LENGTH_SHORT).show();
        }
    }
 
    privateContext getContext() {
        if(mEditText != null) {
            returnmEditText.getContext();
        }
        returnnull;
    }
 
}
 
 
 
////////////////////////////////////////////////////////////////////////////////////
 
        InputLengthControler ilc = newInputLengthControler();
        EditText inputBox = (EditText) findViewById(R.id.xx);
        finalint maxLength = 140;
        TextView lengthHintView = (TextView) findViewById(R.id.xxxxx);
        ilc.config(inputBox, maxLength, lengthHintView);

EditText 输入字数限制


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