Android訊息提示類viewbadger

Android訊息提示類viewbadger ，效果如下：

代碼如下

BadgeView.java

import android.content.Context;import android.content.res.Resources;import android.graphics.Color;import android.graphics.Typeface;import android.graphics.drawable.ShapeDrawable;import android.graphics.drawable.shapes.RoundRectShape;import android.util.AttributeSet;import android.util.TypedValue;import android.view.Gravity;import android.view.View;import android.view.ViewGroup;import android.view.ViewGroup.LayoutParams;import android.view.ViewParent;import android.view.animation.AccelerateInterpolator;import android.view.animation.AlphaAnimation;import android.view.animation.Animation;import android.view.animation.DecelerateInterpolator;import android.widget.FrameLayout;import android.widget.TabWidget;import android.widget.TextView;/** * A simple text label view that can be applied as a "badge" to any given {@link android.view.View}.  * This class is intended to be instantiated at runtime rather than included in XML layouts. *  * @author Jeff Gilfelt */public class BadgeView extends TextView {public static final int POSITION_TOP_LEFT = 1;public static final int POSITION_TOP_RIGHT = 2;public static final int POSITION_BOTTOM_LEFT = 3;public static final int POSITION_BOTTOM_RIGHT = 4;public static final int POSITION_CENTER = 5;private static final int DEFAULT_MARGIN_DIP = 10;private static final int DEFAULT_LR_PADDING_DIP = 8;private static final int DEFAULT_CORNER_RADIUS_DIP = 10;private static final int DEFAULT_POSITION = POSITION_TOP_RIGHT;private static final int DEFAULT_BADGE_COLOR = Color.parseColor("#CCFF0000"); //Color.RED;private static final int DEFAULT_TEXT_COLOR = Color.WHITE;private static Animation fadeIn;private static Animation fadeOut;private Context context;private View target;private int badgePosition;private int badgeMarginH;private int badgeMarginV;private int badgeColor;private boolean isShown;private ShapeDrawable badgeBg;private int targetTabIndex;public BadgeView(Context context) {this(context, (AttributeSet) null, android.R.attr.textViewStyle);}public BadgeView(Context context, AttributeSet attrs) { this(context, attrs, android.R.attr.textViewStyle);}/**     * Constructor -     *      * create a new BadgeView instance attached to a target {@link android.view.View}.     *     * @param context context for this view.     * @param target the View to attach the badge to.     */public BadgeView(Context context, View target) { this(context, null, android.R.attr.textViewStyle, target, 0);}/**     * Constructor -     *      * create a new BadgeView instance attached to a target {@link android.widget.TabWidget}     * tab at a given index.     *     * @param context context for this view.     * @param target the TabWidget to attach the badge to.     * @param index the position of the tab within the target.     */public BadgeView(Context context, TabWidget target, int index) {this(context, null, android.R.attr.textViewStyle, target, index);}public BadgeView(Context context, AttributeSet attrs, int defStyle) {this(context, attrs, defStyle, null, 0);}public BadgeView(Context context, AttributeSet attrs, int defStyle, View target, int tabIndex) {super(context, attrs, defStyle);init(context, target, tabIndex);}private void init(Context context, View target, int tabIndex) {this.context = context;this.target = target;this.targetTabIndex = tabIndex;// apply defaultsbadgePosition = DEFAULT_POSITION;badgeMarginH = dipToPixels(DEFAULT_MARGIN_DIP);badgeMarginV = badgeMarginH;badgeColor = DEFAULT_BADGE_COLOR;setTypeface(Typeface.DEFAULT_BOLD);int paddingPixels = dipToPixels(DEFAULT_LR_PADDING_DIP);setPadding(paddingPixels, 0, paddingPixels, 0);setTextColor(DEFAULT_TEXT_COLOR);setTextSize(18.0f);fadeIn = new AlphaAnimation(0, 1);fadeIn.setInterpolator(new DecelerateInterpolator());fadeIn.setDuration(200);fadeOut = new AlphaAnimation(1, 0);fadeOut.setInterpolator(new AccelerateInterpolator());fadeOut.setDuration(200);isShown = false;if (this.target != null) {applyTo(this.target);} else {show();}}private void applyTo(View target) {LayoutParams lp = target.getLayoutParams();ViewParent parent = target.getParent();FrameLayout container = new FrameLayout(context);if (target instanceof TabWidget) {// set target to the relevant tab child containertarget = ((TabWidget) target).getChildTabViewAt(targetTabIndex);this.target = target;((ViewGroup) target).addView(container, new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT));this.setVisibility(View.GONE);container.addView(this);} else {// TODO verify that parent is indeed a ViewGroupViewGroup group = (ViewGroup) parent; int index = group.indexOfChild(target);group.removeView(target);group.addView(container, index, lp);container.addView(target);this.setVisibility(View.GONE);container.addView(this);group.invalidate();}}/**     * Make the badge visible in the UI.     *      */public void show() {show(false, null);}/**     * Make the badge visible in the UI.     *     * @param animate flag to apply the default fade-in animation.     */public void show(boolean animate) {show(animate, fadeIn);}/**     * Make the badge visible in the UI.     *     * @param anim Animation to apply to the view when made visible.     */public void show(Animation anim) {show(true, anim);}/**     * Make the badge non-visible in the UI.     *      */public void hide() {hide(false, null);}/**     * Make the badge non-visible in the UI.     *     * @param animate flag to apply the default fade-out animation.     */public void hide(boolean animate) {hide(animate, fadeOut);}/**     * Make the badge non-visible in the UI.     *     * @param anim Animation to apply to the view when made non-visible.     */public void hide(Animation anim) {hide(true, anim);}/**     * Toggle the badge visibility in the UI.     *      */public void toggle() {toggle(false, null, null);}/**     * Toggle the badge visibility in the UI.     *      * @param animate flag to apply the default fade-in/out animation.     */public void toggle(boolean animate) {toggle(animate, fadeIn, fadeOut);}/**     * Toggle the badge visibility in the UI.     *     * @param animIn Animation to apply to the view when made visible.     * @param animOut Animation to apply to the view when made non-visible.     */public void toggle(Animation animIn, Animation animOut) {toggle(true, animIn, animOut);}private void show(boolean animate, Animation anim) {if (getBackground() == null) {if (badgeBg == null) {badgeBg = getDefaultBackground();}setBackgroundDrawable(badgeBg);}applyLayoutParams();if (animate) {this.startAnimation(anim);}this.setVisibility(View.VISIBLE);isShown = true;}private void hide(boolean animate, Animation anim) {this.setVisibility(View.GONE);if (animate) {this.startAnimation(anim);}isShown = false;}private void toggle(boolean animate, Animation animIn, Animation animOut) {if (isShown) {hide(animate && (animOut != null), animOut);} else {show(animate && (animIn != null), animIn);}}/**     * Increment the numeric badge label. If the current badge label cannot be converted to     * an integer value, its label will be set to "0".     *      * @param offset the increment offset.     */public int increment(int offset) {CharSequence txt = getText();int i;if (txt != null) {try {i = Integer.parseInt(txt.toString());} catch (NumberFormatException e) {i = 0;}} else {i = 0;}i = i + offset;setText(String.valueOf(i));return i;}/**     * Decrement the numeric badge label. If the current badge label cannot be converted to     * an integer value, its label will be set to "0".     *      * @param offset the decrement offset.     */public int decrement(int offset) {return increment(-offset);}private ShapeDrawable getDefaultBackground() {int r = dipToPixels(DEFAULT_CORNER_RADIUS_DIP);float[] outerR = new float[] {r, r, r, r, r, r, r, r};        RoundRectShape rr = new RoundRectShape(outerR, null, null);ShapeDrawable drawable = new ShapeDrawable(rr);drawable.getPaint().setColor(badgeColor);return drawable;}private void applyLayoutParams() {FrameLayout.LayoutParams lp = new FrameLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);switch (badgePosition) {case POSITION_TOP_LEFT:lp.gravity = Gravity.LEFT | Gravity.TOP;lp.setMargins(badgeMarginH, badgeMarginV, 0, 0);break;case POSITION_TOP_RIGHT:lp.gravity = Gravity.RIGHT | Gravity.TOP;lp.setMargins(0, badgeMarginV, badgeMarginH, 0);break;case POSITION_BOTTOM_LEFT:lp.gravity = Gravity.LEFT | Gravity.BOTTOM;lp.setMargins(badgeMarginH, 0, 0, badgeMarginV);break;case POSITION_BOTTOM_RIGHT:lp.gravity = Gravity.RIGHT | Gravity.BOTTOM;lp.setMargins(0, 0, badgeMarginH, badgeMarginV);break;case POSITION_CENTER:lp.gravity = Gravity.CENTER;lp.setMargins(0, 0, 0, 0);break;default:break;}setLayoutParams(lp);}/**     * Returns the target View this badge has been attached to.     *      */public View getTarget() {return target;}/**     * Is this badge currently visible in the UI?     *      */@Overridepublic boolean isShown() {return isShown;}/**     * Returns the positioning of this badge.     *      * one of POSITION_TOP_LEFT, POSITION_TOP_RIGHT, POSITION_BOTTOM_LEFT, POSITION_BOTTOM_RIGHT, POSTION_CENTER.     *      */public int getBadgePosition() {return badgePosition;}/**     * Set the positioning of this badge.     *      * @param layoutPosition one of POSITION_TOP_LEFT, POSITION_TOP_RIGHT, POSITION_BOTTOM_LEFT, POSITION_BOTTOM_RIGHT, POSTION_CENTER.     *      */public void setBadgePosition(int layoutPosition) {this.badgePosition = layoutPosition;}/**     * Returns the horizontal margin from the target View that is applied to this badge.     *      */public int getHorizontalBadgeMargin() {return badgeMarginH;}/**     * Returns the vertical margin from the target View that is applied to this badge.     *      */public int getVerticalBadgeMargin() {return badgeMarginV;}/**     * Set the horizontal/vertical margin from the target View that is applied to this badge.     *      * @param badgeMargin the margin in pixels.     */public void setBadgeMargin(int badgeMargin) {this.badgeMarginH = badgeMargin;this.badgeMarginV = badgeMargin;}/**     * Set the horizontal/vertical margin from the target View that is applied to this badge.     *      * @param horizontal margin in pixels.     * @param vertical margin in pixels.     */public void setBadgeMargin(int horizontal, int vertical) {this.badgeMarginH = horizontal;this.badgeMarginV = vertical;}/**     * Returns the color value of the badge background.     *      */public int getBadgeBackgroundColor() {return badgeColor;}/**     * Set the color value of the badge background.     *      * @param badgeColor the badge background color.     */public void setBadgeBackgroundColor(int badgeColor) {this.badgeColor = badgeColor;badgeBg = getDefaultBackground();}//dip轉換px通用方法/函數private int dipToPixels(int dip) {Resources r = getResources();float px = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dip, r.getDisplayMetrics());return (int) px;}}

使用方法：

RelativeLayout dh = (RelativeLayout)view.findViewById(R.id.dh);BadgeView badge = new BadgeView(context, dh);badge.setText("1");//消失與現實badge.show();//badge.toggle();

代碼來自github的開源項目https://github.com/jgilfelt/android-viewbadger

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