android自定义控件--BadgeView

BadgeView用于在按钮或其他控件上方放置一个文字的view，类似于水果的图标数字提醒，效果图如下

注：上面这个不是我要介绍的BadgeView，是下面这个，不过效果相同，而且个人感觉更方便。

这个是我要介绍的BadgeView

直接把这个项目中的BadgeView控件抽出来放到自己的项目中拿来用就可以了

不管三七二十一，先把BadgeView的代码贴上

public class BadgeView extends TextView {    private boolean mHideOnNull = true;    public BadgeView(Context context) {        this(context, null);    }    public BadgeView(Context context, AttributeSet attrs) {        this(context, attrs, android.R.attr.textViewStyle);    }    public BadgeView(Context context, AttributeSet attrs, int defStyle) {        super(context, attrs, defStyle);        init();    }    private void init() {        if (!(getLayoutParams() instanceof LayoutParams)) {            LayoutParams layoutParams =                    new LayoutParams(                            android.view.ViewGroup.LayoutParams.WRAP_CONTENT,                            android.view.ViewGroup.LayoutParams.WRAP_CONTENT,                            Gravity.RIGHT | Gravity.TOP);            setLayoutParams(layoutParams);        }        // set default font        setTextColor(Color.WHITE);        setTypeface(Typeface.DEFAULT_BOLD);        setTextSize(TypedValue.COMPLEX_UNIT_SP, 11);        setPadding(dip2Px(5), dip2Px(1), dip2Px(5), dip2Px(1));        // set default background        setBackground(9, Color.parseColor("#d3321b"));        setGravity(Gravity.CENTER);        // default values        setHideOnNull(true);        setBadgeCount(0);    }    @SuppressWarnings("deprecation")    public void setBackground(int dipRadius, int badgeColor) {        int radius = dip2Px(dipRadius);        float[] radiusArray = new float[] { radius, radius, radius, radius, radius, radius, radius, radius };        RoundRectShape roundRect = new RoundRectShape(radiusArray, null, null);        ShapeDrawable bgDrawable = new ShapeDrawable(roundRect);        bgDrawable.getPaint().setColor(badgeColor);        setBackgroundDrawable(bgDrawable);    }    /**     * @return Returns true if view is hidden on badge value 0 or null;     */    public boolean isHideOnNull() {        return mHideOnNull;    }    /**     * @param hideOnNull the hideOnNull to set     */    public void setHideOnNull(boolean hideOnNull) {        mHideOnNull = hideOnNull;        setText(getText());    }    /*     * (non-Javadoc)     *      * @see android.widget.TextView#setText(java.lang.CharSequence, android.widget.TextView.BufferType)     */    @Override    public void setText(CharSequence text, BufferType type) {        if (isHideOnNull() && (text == null || text.toString().equalsIgnoreCase("0"))) {            setVisibility(View.GONE);        } else {            setVisibility(View.VISIBLE);        }        super.setText(text, type);    }    public void setBadgeCount(int count) {        setText(String.valueOf(count));    }    public Integer getBadgeCount() {        if (getText() == null) {            return null;        }        String text = getText().toString();        try {            return Integer.parseInt(text);        } catch (NumberFormatException e) {            return null;        }    }    public void setBadgeGravity(int gravity) {        FrameLayout.LayoutParams params = (LayoutParams) getLayoutParams();        params.gravity = gravity;        setLayoutParams(params);    }    public int getBadgeGravity() {        FrameLayout.LayoutParams params = (LayoutParams) getLayoutParams();        return params.gravity;    }    public void setBadgeMargin(int dipMargin) {        setBadgeMargin(dipMargin, dipMargin, dipMargin, dipMargin);    }    public void setBadgeMargin(int leftDipMargin, int topDipMargin, int rightDipMargin, int bottomDipMargin) {        FrameLayout.LayoutParams params = (LayoutParams) getLayoutParams();        params.leftMargin = dip2Px(leftDipMargin);        params.topMargin = dip2Px(topDipMargin);        params.rightMargin = dip2Px(rightDipMargin);        params.bottomMargin = dip2Px(bottomDipMargin);        setLayoutParams(params);    }    public int[] getBadgeMargin() {        FrameLayout.LayoutParams params = (LayoutParams) getLayoutParams();        return new int[] { params.leftMargin, params.topMargin, params.rightMargin, params.bottomMargin };    }    public void incrementBadgeCount(int increment) {        Integer count = getBadgeCount();        if (count == null) {            setBadgeCount(increment);        } else {            setBadgeCount(increment + count);        }    }    public void decrementBadgeCount(int decrement) {        incrementBadgeCount(-decrement);    }    /*     * Attach the BadgeView to the TabWidget     *      * @param target the TabWidget to attach the BadgeView     *      * @param tabIndex index of the tab     */    public void setTargetView(TabWidget target, int tabIndex) {        View tabView = target.getChildTabViewAt(tabIndex);        setTargetView(tabView);    }    /*     * Attach the BadgeView to the target view     *      * @param target the view to attach the BadgeView     */    public void setTargetView(View target) {        if (getParent() != null) {            ((ViewGroup) getParent()).removeView(this);        }        if (target == null) {            return;        }        if (target.getParent() instanceof FrameLayout) {            ((FrameLayout) target.getParent()).addView(this);        } else if (target.getParent() instanceof ViewGroup) {            // use a new Framelayout container for adding badge            ViewGroup parentContainer = (ViewGroup) target.getParent();            int groupIndex = parentContainer.indexOfChild(target);            parentContainer.removeView(target);            FrameLayout badgeContainer = new FrameLayout(getContext());            ViewGroup.LayoutParams parentlayoutParams = target.getLayoutParams();            parentContainer.addView(badgeContainer, groupIndex, parentlayoutParams);            badgeContainer.addView(target);            badgeContainer.addView(this);        } else if (target.getParent() == null) {            Log.e(getClass().getSimpleName(), "ParentView is needed");        }    }    /*     * converts dip to px     */    private int dip2Px(float dip) {        return (int) (dip * getContext().getResources().getDisplayMetrics().density + 0.5f);    }}

用法：

BadgeView bv = new BadgeView(getContext());bv.setBadgeGravity(Gravity.TOP|Gravity.RIGHT);//右上角bv.setBadgeMargin(0, 8, 0, 0);//margin值bv.setBackgroundResource(R.drawable.backgroundbg);//背景bv.setText("哈哈");//文字bv.setTargetView(target);//目标view，BadgeView放置的位置