Android显示和隐藏密码的自定义EditView

来源：互联网发布：程序员图片编辑：程序博客网时间：2024/06/06 09:57
自定一个EditView，设置其DrawableRight为显示或隐藏密码属性，同时当点击drawable时，阻止弹出输入键盘功能。
public class PasswordEditText extends EditText implements View.OnFocusChangeListener, TextWatcher {    private Drawable mDrawable;    private boolean hasFocus;    public PasswordEditText(Context context) {        this(context, null);    }    public PasswordEditText(Context context, AttributeSet attrs) {        this(context, attrs, android.R.attr.editTextStyle);    }    public PasswordEditText(Context context, AttributeSet attrs, int defStyle) {        super(context, attrs, defStyle);        initView();    }    private void initView() {        //get the DrawableRight,        mDrawable = getCompoundDrawables()[2]; //drawables position: left top right bottom.        if (mDrawable == null) {            mDrawable = ContextCompat.getDrawable(getContext(), R.drawable.invisible);  //the visible and invisible icon        }        mDrawable.setBounds(0, 0, mDrawable.getIntrinsicWidth(), mDrawable.getIntrinsicHeight());        //set icon visible in default view        setIconVisible(true);        //set focus listener        setOnFocusChangeListener(this);        //add text change listener        addTextChangedListener(this);    }    @Override    public void beforeTextChanged(CharSequence s, int start, int count, int after) {    }    @Override    public void afterTextChanged(Editable s) {    }    @Override    public void onTextChanged(CharSequence s, int start, int count, int after) {        if (hasFocus) {            setIconVisible(true);        }    }    @Override    public void onFocusChange(View v, boolean hasFocus) {        this.hasFocus = hasFocus;        if (hasFocus) {            setIconVisible(true);        } else {            setIconVisible(false);        }    }    @Override    public boolean onTouchEvent(MotionEvent event) {        if (event.getAction() == MotionEvent.ACTION_UP) {            if (getCompoundDrawables()[2] != null) {                int x = (int) event.getX();                int y = (int) event.getY();                Rect rect = getCompoundDrawables()[2].getBounds();                int height = rect.height();                int distance = (getHeight() - height) / 2;                boolean isInnerWidth = x > (getWidth() - getTotalPaddingRight()) && x < (getWidth() - getPaddingRight());                boolean isInnerHeight = y > distance && y < (distance + height);                if (isInnerWidth && isInnerHeight) {                    if (this.getTransformationMethod() == HideReturnsTransformationMethod.getInstance()) {                        this.setTransformationMethod(PasswordTransformationMethod.getInstance());                        mDrawable = getCompoundDrawables()[2];  //the right drawable                        mDrawable = ContextCompat.getDrawable(getContext(), R.drawable.invisible);                        mDrawable.setBounds(0, 0, mDrawable.getIntrinsicWidth(), mDrawable.getIntrinsicHeight());                        setIconVisible(true);                        return true;   //stop the event                    } else {                        this.setTransformationMethod(HideReturnsTransformationMethod.getInstance());                        mDrawable = getCompoundDrawables()[2];  //the right drawable                        mDrawable = ContextCompat.getDrawable(getContext(), R.drawable.visible);                        mDrawable.setBounds(0, 0, mDrawable.getIntrinsicWidth(), mDrawable.getIntrinsicHeight());                        setIconVisible(true);                        return true;   //stop the event                    }                }            }        }        return super.onTouchEvent(event);    }    protected void setIconVisible(boolean visible) {        Drawable right = visible ? mDrawable : null;        setCompoundDrawables(getCompoundDrawables()[0], getCompoundDrawables()[1], right, getCompoundDrawables()[3]);    }}
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