Android程序开发之防止密码输入错误密码明文显示功能

// 初始化布局
public void initFields(AttributeSet attrs, int defStyleAttr) {
if (attrs != null) {
// 获取属性信息
TypedArray styles = getContext().getTheme().obtainStyledAttributes(attrs, R.styleable.PasswordEditText, defStyleAttr, 0);
try {
// 根据参数, 设置Icon
mShowPwdIcon = styles.getResourceId(R.styleable.PasswordEditText_pet_iconShow, mShowPwdIcon);
mHidePwdIcon = styles.getResourceId(R.styleable.PasswordEditText_pet_iconHide, mHidePwdIcon);
} finally {
styles.recycle();
}
}
// 密码状态
setInputType(EditorInfo.TYPE_CLASS_TEXT | EditorInfo.TYPE_TEXT_VARIATION_PASSWORD);
addTextChangedListener(new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
@Override public void onTextChanged(CharSequence s, int start, int before, int count) {
if (s.length() > 0) {
// 有文字时显示指示器
showPasswordVisibilityIndicator(true);
} else {
mIsShowPwdIcon = false;
restorePasswordIconVisibility(mIsShowPwdIcon);
showPasswordVisibilityIndicator(false); // 隐藏指示器
}
}
@Override public void afterTextChanged(Editable s) {
}
});
}

@Override public boolean onTouchEvent(MotionEvent event) {
if (mDrawableSide == null) {
return super.onTouchEvent(event);
}
final Rect bounds = mDrawableSide.getBounds();
final int x = (int) event.getRawX(); // 点击的位置
int icOnX= (int) getTopRightCorner().x;
// Icon的位置
int leftIcon = iconX - bounds.width();
Log.e(TAG, "x: " + x + ", leftIcon: " + leftIcon);
// 大于Icon的位置, 才能触发点击
if (x >= leftIcon) {
togglePasswordIconVisibility(); // 变换状态
event.setAction(MotionEvent.ACTION_CANCEL);
return false;
}
return super.onTouchEvent(event);
}

// 设置密码指示器的状态
private void restorePasswordIconVisibility(boolean isShowPwd) {
if (isShowPwd) {
// 可视密码输入
setInputType(EditorInfo.TYPE_CLASS_TEXT | EditorInfo.TYPE_TEXT_VARIATION_VISIBLE_PASSWORD);
} else {
// 非可视密码状态
setInputType(EditorInfo.TYPE_CLASS_TEXT | EditorInfo.TYPE_TEXT_VARIATION_PASSWORD);
}
// 移动光标
setSelection(getText().length());
}

// 存储密码状态, 显示Icon的位置
protected static class PwdSavedState extends BaseSavedState {
private final boolean mShowingIcon;
private PwdSavedState(Parcelable superState, boolean showingIcon) {
super(superState);
mShowingIcon = showingIcon;
}
private PwdSavedState(Parcel in) {
super(in);
mShowingIcon = in.readByte() != 0;
}
public boolean isShowingIcon() {
return mShowingIcon;
}
@Override
public void writeToParcel(Parcel destination, int flags) {
super.writeToParcel(destination, flags);
destination.writeByte((byte) (mShowingIcon &＃63; 1 : 0));
}
public static final Parcelable.Creator CREATOR = new Creator() {
public PwdSavedState createFromParcel(Parcel in) {
return new PwdSavedState(in);
}
public PwdSavedState[] newArray(int size) {
return new PwdSavedState[size];
}
};
}