1.笨方法是設定標誌位或者根據isSelected屬性、isChecked屬性什麼的來改變。

2.我想的是，既然xml中有android:inputType這個屬性，那麼程式碼中直接用getInputType()方法得到它的輸入型別，然後和它的各種屬性比較不就能判斷嘛，於是我就這麼幹了

//切換密碼是否可見
case R.id.pwdIsVisible:
    int isVisible = mInputPwd.getInputType();
Log.d("aa", "isVisible: " + isVisible);
Log.d("aa", "TYPE_TEXT_VARIATION_PASSWORD: "
 
+InputType.TYPE_TEXT_VARIATION_PASSWORD);
Log.d("aa", "TYPE_TEXT_VARIATION_VISIBLE_PASSWORD: "+InputType.TYPE_TEXT_VARIATION_VISIBLE_PASSWORD);
    if (isVisible == InputType.TYPE_TEXT_VARIATION_PASSWORD) {
        mPwdIsVisible.setImageResource(R.drawable.password_visible);
mInputPwd.setInputType(InputType.TYPE_TEXT_VARIATION_VISIBLE_PASSWORD
 
);
}else{
        mPwdIsVisible.setImageResource(R.drawable.password_unvisible);
mInputPwd.setInputType(InputType.TYPE_TEXT_VARIATION_PASSWORD);
}
    break;

//切換密碼是否可見
 
case R.id.pwdIsVisible:
    int isVisible = mInputPwd.getInputType();
Log.d("aa", "isVisible: " + isVisible);
Log.d("aa", "TYPE_TEXT_VARIATION_PASSWORD: "+InputType.TYPE_TEXT_VARIATION_PASSWORD);
Log.d("aa", "TYPE_TEXT_VARIATION_VISIBLE_PASSWORD: "+InputType.TYPE_TEXT_VARIATION_VISIBLE_PASSWORD);
    if (isVisible == (InputType.TYPE_CLASS_TEXT|InputType.TYPE_TEXT_VARIATION_PASSWORD)) {
        mPwdIsVisible.setImageResource(R.drawable.password_visible);
mInputPwd.setInputType(InputType.TYPE_CLASS_TEXT|InputType.TYPE_TEXT_VARIATION_VISIBLE_PASSWORD);
}else{
        mPwdIsVisible.setImageResource(R.drawable.password_unvisible);
mInputPwd.setInputType(InputType.TYPE_CLASS_TEXT|InputType.TYPE_TEXT_VARIATION_PASSWORD);
}
    break;

我又發現切換後會自動把cursor放在最前面，這讓我十分不爽，於是我把cursor弄回來了

//切換密碼是否可見
case R.id.pwdIsVisible:
    int isVisible = mInputPwd.getInputType();
int cursorPosition = mInputPwd.length();Log.d("aa", "isVisible: " + isVisible);
Log.d("aa", "TYPE_TEXT_VARIATION_PASSWORD: "+InputType.TYPE_TEXT_VARIATION_PASSWORD);
Log.d("aa", "TYPE_TEXT_VARIATION_VISIBLE_PASSWORD: "+InputType.TYPE_TEXT_VARIATION_VISIBLE_PASSWORD);
    if (isVisible == (InputType.TYPE_CLASS_TEXT|InputType.TYPE_TEXT_VARIATION_PASSWORD)) {
        mPwdIsVisible.setImageResource(R.drawable.password_visible);
mInputPwd.setInputType(InputType.TYPE_CLASS_TEXT | InputType.TYPE_TEXT_VARIATION_VISIBLE_PASSWORD);
mInputPwd.setSelection(cursorPosition);}else{
        mPwdIsVisible.setImageResource(R.drawable.password_unvisible);
mInputPwd.setInputType(InputType.TYPE_CLASS_TEXT|InputType.TYPE_TEXT_VARIATION_PASSWORD);
mInputPwd.setSelection(cursorPosition);}
    break;