当视图失去焦点时，如何在EditText中屏蔽文本。

Question

因此，如果用户输入“ 1234”，则他们将在EditText字段中看到“ 1234”。 但是当该字段失去焦点时，我希望它显示“ ****”

因此，我实现了一个自定义的TransformationMethod，该方法仅在EditText字段没有焦点时才掩盖输入的文本。

当我输入文本“ 12345”时，它应显示为应为“ 12345”，但是当我单击其他字段时，数字永远不会被掩盖。 我想看到“ *****”，但仍然看到相同的“ 12345”

如果我旋转设备（强迫它重新加载所有内容），它会正确显示“ *****”。 而且，当我单击EditText字段时，它可以将遮罩的文本正确地从“ *****”更改为“ 12345”，因此在获得焦点时有效，而在失去焦点时则无效。 我试过实现OnFocusChangeListener，但似乎没有任何效果。

有什么办法可以迫使EditText字段在失去焦点时重新绘制文本？

设定：

 editText.setTransformationMethod(CustomPasswordTransformationMethod(numUnobfuscatedDigits))
editText.setOnFocusChangeListener { view, hasFocus ->
                    ((EditText)view).invalidate()    
                     ((EditText)view).refreshDrawableState()                    

CustomPasswordTransformationMethod：公共类CustomPasswordTransformationMethod扩展了PasswordTransformationMethod {private int unObfuscated = 1; 私有布尔值mIsFocused = false;

    /**
     * @param number the number of digits that will be unObfuscated at the end of the input string. Must be a positive integer or 0.
     */
    public CustomPasswordTransformationMethod(int number) {
        if (number < 0) {
            Log.e(TAG, "Invalid parameter number =" + number + " number of un-obfuscated digits must be a positive integer or 0.");
            unObfuscated = 0;
        }
        unObfuscated = number;
    }

    @Override
    public CharSequence getTransformation(CharSequence source, View view) {
        return new PasswordCharSequence(source);
    }

    @Override
    public void onFocusChanged(View view, CharSequence sourceText,
                               boolean focused, int direction,
                               Rect previouslyFocusedRect) {
        super.onFocusChanged(view,sourceText,focused, direction, previouslyFocusedRect);
        mIsFocused = focused;
    }


    private class PasswordCharSequence implements CharSequence {
        private CharSequence mSource;

        public PasswordCharSequence(CharSequence source) {
            mSource = source; // Store char sequence
        }

        public char charAt(int index) {
            if(mIsFocused) return mSource.charAt(index);
            else {
                if (index < ((length()) - unObfuscated)) return '●';
                return mSource.charAt(index);
            }
        }

        public int length() {
            return mSource.length(); // Return default
        }

        public CharSequence subSequence(int start, int end) {
            return mSource.subSequence(start, end); // Return default
        }
    }
};

Answer 1

试试这个，看看它是否满足您的需求。

editText.setOnFocusChangeListener(new View.OnFocusChangeListener() {
    @Override
    public void onFocusChange(View view, boolean hasFocus) {
        if(hasFocus){
            editText.setTransformationMethod(HideReturnsTransformationMethod.getInstance());
        }
        else{
            editText.setTransformationMethod(PasswordTransformationMethod.getInstance());
        }
    }
});

Answer 2

也许您可以尝试保持简单：

String password = "";

editText.setOnFocusChangeListener(new OnFocusChangeListener() {
    @Override
    public void onFocusChange(View view, boolean hasFocus) {
        if (hasFocus) {
            editText.setText(password, TextView.BufferType.EDITABLE);
        } else {
            password = editText.getText().toString();
            String ofuscated = "";
            for (int i = 0; i < password.length(); i++){ ofuscated += "*"; }
            editText.setText(ofuscated, TextView.BufferType.EDITABLE);
        }
    }
});