java - 在 Android 中使用可绘制图标显示和隐藏密码

Question

我使用EditText设计了一个带有密码字段的屏幕，在EditText中我使用drawableRightIcon，它必须在我们单击可绘制按钮时显示可见的密码，并用另一个图标替换该可绘制图标？有人可以帮忙吗？

Answer 1

以下是我目前在我的应用程序中用于此目的的代码。我们基本上在 EditText 上放置了一个触摸监听器，并确定点击是否发生在可绘制对象上并采取相应的操作(也切换图标):

getPasswordEditText().setOnTouchListener(new View.OnTouchListener() {
            @Override
            public boolean onTouch(View v, MotionEvent event) {
                final int DRAWABLE_RIGHT = 2; // index

                if (event.getAction() == MotionEvent.ACTION_UP) {
                    if (event.getRawX() >= (getPasswordEditText().getRight() - getPasswordEditText().getCompoundDrawables()[DRAWABLE_RIGHT].getBounds().width())) {
                        if (passwordShown) {
                            passwordShown = false;
                            // 129 is obtained by bitwise ORing InputType.TYPE_CLASS_TEXT | InputType.TYPE_TEXT_VARIATION_PASSWORD
                            getPasswordEditText().setInputType(129);

                            // Need to call following as the font is changed to mono-space by default for password fields
                            getPasswordEditText().setTypeface(Typeface.SANS_SERIF);
                            getPasswordEditText().setCompoundDrawablesWithIntrinsicBounds(0, 0, R.drawable.locked_icon, 0);
                        } else {
                            passwordShown = true;
                            getPasswordEditText().setInputType(InputType.TYPE_TEXT_VARIATION_PASSWORD);

                            getPasswordEditText().setCompoundDrawablesWithIntrinsicBounds(0, 0, R.drawable.unlocked_icon, 0);
                        }

                        return true;
                    }
                }
                return false;
            }
        });