Android仿QQ微信未读消息小红点BadgeHelper
Android 小红点 未读消息功能 BadgeHelper
因为最近的项目需求,翻遍github上的未读消息红点开源库, 发现大部分
不能适配不同情况的布局, 所以我写了一个能兼容全部的 !
网上的写法是 继承TextView然后生成一个小红点drawable,设置到背景中去, 然后把目标view外层加一层FrameLayout,然后把小红点添加进去
但这样做的问题来了, 小红点与目标View 会叠起来!, 挡住文字,!!! 看得我瞎了~~~ 而且 他们提供的setOffsetX setpadding 之类的没卵用,你如果想要偏移小红点让它不与下面的View重叠,那是不可能的
所以我的写法是 为了更好的性能,直接继承View然后画小红点背景, 然后把目标view外层加一层LinearLayout 让小红点View放目标的右边,这样就不会重叠
同时 我也支持设置 重叠模式和非重叠模式
这是效果图
由于github账号出问题了,没法上传, 所以写到博客上算了
这只是一个小工具类 供大家学习下我的思路, 就不多说了, 具体实现注释里写的很清楚,不太清楚的可以回复问我
#核心类:
##BadgeHelper .java
package com.truescend.gofit.views; import android.content.Context; import android.content.res.Resources; import android.graphics.Canvas; import android.graphics.Paint; import android.graphics.Rect; import android.graphics.RectF; import android.support.annotation.IntDef; import android.support.design.widget.TabLayout; import android.util.Log; import android.util.TypedValue; import android.view.Gravity; import android.view.View; import android.view.ViewGroup; import android.widget.FrameLayout; import android.widget.LinearLayout; import java.lang.annotation.Retention; import java.lang.annotation.RetentionPolicy; import java.lang.reflect.Field; /** * 作者:东芝(2018/8/23). * 支持 重叠目标模式 和 放目标右上角但不重叠的模式 两种模式 通过setOverlap 设置, 默认为false=不重叠 */ public class BadgeHelper extends View { private static final String TAG = "BadgeHelper"; private float density; private Paint mTextPaint; private Paint mBackgroundPaint; private String text = "0"; private int number; @Type private int type = Type.TYPE_POINT; private boolean isOverlap; private final RectF rect = new RectF(); private int badgeColor = 0xFFD3321B; //默认的小红点颜色 private int textColor = 0xFFFFFFff; private float textSize; private int w; private int h; private boolean isSetup; private boolean mIgnoreTargetPadding; private boolean isCenterVertical; private int leftMargin; private int topMargin; private int rightMargin; private int bottomMargin; @IntDef({Type.TYPE_POINT, Type.TYPE_TEXT}) @Retention(RetentionPolicy.SOURCE) public @interface Type { int TYPE_POINT = 0; int TYPE_TEXT = 1; } public BadgeHelper(Context context) { super(context); } private void init(@Type int type, boolean isOverlap) { this.type = type; this.isOverlap = isOverlap; density = getResources().getDisplayMetrics().density; switch (type) { case Type.TYPE_POINT: mBackgroundPaint = new Paint(); mBackgroundPaint.setStyle(Paint.Style.FILL); mBackgroundPaint.setFlags(Paint.ANTI_ALIAS_FLAG); mBackgroundPaint.setColor(badgeColor); //计算小红点无文本情况下的小红点大小, 按屏幕像素计算, 如果你有你自己认为更好的算法, 改这里即可 w = h = Math.round(density * 7f); break; case Type.TYPE_TEXT: mBackgroundPaint = new Paint(); mBackgroundPaint.setStyle(Paint.Style.FILL); mBackgroundPaint.setFlags(Paint.ANTI_ALIAS_FLAG); mBackgroundPaint.setColor(badgeColor); mTextPaint = new Paint(); mTextPaint.setStyle(Paint.Style.FILL); mTextPaint.setFlags(Paint.ANTI_ALIAS_FLAG); mTextPaint.setColor(textColor);//文本颜色 if (textSize == 0) { mTextPaint.setTextSize(density * 10);//文本大小按屏幕像素 计算, 没写死是为了适配各种屏幕, 但如果你有你认为更合理的计算方式 你可以改这里 } else { mTextPaint.setTextSize(textSize);//使用自定义大小 } //计算小红点有文本情况下的小红点大小, 按文本宽高计算, 如果你有你自己认为更好的算法, 改这里即可 float textWidth = getTextWidth("99", mTextPaint); w = h = Math.round(textWidth * 1.4f);//让背景比文本大一点 break; } } /** * 设置Margin 可用于做偏移 * @param left * @param top * @param right * @param bottom * @return */ public BadgeHelper setBadgeMargins(int left, int top, int right, int bottom) { leftMargin = left; topMargin = top; rightMargin = right; bottomMargin = bottom; return this; } /** * 设置Gravity居中 * @return */ public BadgeHelper setBadgeCenterVertical( ) { isCenterVertical = true; return this; } /** * 设置小红点类型 * * @param type * @return */ public BadgeHelper setBadgeType(@Type int type) { this.type = type; return this; } /** * 设置小红点大小, 默认自动适配 * * @param textSize * @return */ public BadgeHelper setBadgeTextSize(int textSize) { Context c = getContext(); Resources r; if (c == null) { r = Resources.getSystem(); } else { r = c.getResources(); } this.textSize = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP, textSize, r.getDisplayMetrics()); return this; } /** * 设置小红点文字颜色, 默认白 * * @param textColor * @return */ public BadgeHelper setBadgeTextColor(int textColor) { this.textColor = textColor; return this; } /** * 设置重叠模式, 默认是false(不重叠) * * @param isOverlap 是否把小红点重叠到目标View之上 * @return */ public BadgeHelper setBadgeOverlap(boolean isOverlap) { return setBadgeOverlap(isOverlap, false); } /** * 设置重叠模式, 默认是false(不重叠) * * @param isOverlap 是否把小红点重叠到目标View之上 * @param isIgnoreTargetPadding 是否忽略目标View的padding * @return */ public BadgeHelper setBadgeOverlap(boolean isOverlap, boolean isIgnoreTargetPadding) { this.isOverlap = isOverlap; this.mIgnoreTargetPadding = isIgnoreTargetPadding; if (!isOverlap && isIgnoreTargetPadding) { Log.w(TAG, "警告:只有重叠模式isOverlap=true 设置mIgnoreTargetPadding才有意义"); } return this; } /** * 设置小红点颜色 * * @param mBadgeColor * @return */ public BadgeHelper setBadgeColor(int mBadgeColor) { this.badgeColor = mBadgeColor; return this; } /** * 设置小红点大小 * * @param w * @param h * @return */ public BadgeHelper setBadgeSize(int w, int h) { this.w = w; this.h = h; return this; } /** * 是否显示 * @param enable */ public void setBadgeEnable(boolean enable) { setVisibility(enable?VISIBLE:INVISIBLE); } /** * 设置小红点的文字 * * @param number */ public void setBadgeNumber(int number) { this.number = number; this.text = String.valueOf(number); if (isSetup) { if(number==0){ setVisibility(INVISIBLE); }else{ setVisibility(VISIBLE); } invalidate(); } } public void bindToTargetView(TabLayout target, int tabIndex) { TabLayout.Tab tab = target.getTabAt(tabIndex); View targetView = null; View tabView = null; try { Field viewField = TabLayout.Tab.class.getDeclaredField("mView"); viewField.setAccessible(true); targetView = tabView = (View) viewField.get(tab); } catch (Exception e) { e.printStackTrace(); } try { if (tabView != null) { Field mTextViewField = tabView.getClass().getDeclaredField("mTextView");//"mIconView" mTextViewField.setAccessible(true); targetView = (View) mTextViewField.get(tabView); } } catch (Exception e) { e.printStackTrace(); } if (targetView != null) { bindToTargetView(targetView); } } /** * 绑定小红点到目标View的右上角 * * @param target */ public void bindToTargetView(View target) { init(type, isOverlap); if (getParent() != null) { ((ViewGroup) getParent()).removeView(this); } if (target == null) { return; } if (target.getParent() instanceof ViewGroup) { ViewGroup parent = (ViewGroup) target.getParent(); int groupIndex = parent.indexOfChild(target); parent.removeView(target); if (isOverlap) {//[小红点与目标View重叠]模式 FrameLayout badgeContainer = new FrameLayout(getContext()); ViewGroup.LayoutParams targetLayoutParams = target.getLayoutParams(); badgeContainer.setLayoutParams(targetLayoutParams); target.setLayoutParams(new ViewGroup.LayoutParams( ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT)); parent.addView(badgeContainer, groupIndex, targetLayoutParams); badgeContainer.addView(target); badgeContainer.addView(this); FrameLayout.LayoutParams layoutParams = (FrameLayout.LayoutParams) getLayoutParams(); if(isCenterVertical) { layoutParams.gravity = Gravity.CENTER_VERTICAL ; }else{ layoutParams.gravity = Gravity.END | Gravity.TOP; } if (mIgnoreTargetPadding) { layoutParams.rightMargin = target.getPaddingRight() - w; layoutParams.topMargin = target.getPaddingTop() - h / 2; } setLayoutParams(layoutParams); } else {//[小红点放右侧]模式 LinearLayout badgeContainer = new LinearLayout(getContext()); badgeContainer.setOrientation(LinearLayout.HORIZONTAL); ViewGroup.LayoutParams targetLayoutParams = target.getLayoutParams(); badgeContainer.setLayoutParams(targetLayoutParams); target.setLayoutParams(new ViewGroup.LayoutParams( ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT)); parent.addView(badgeContainer, groupIndex, targetLayoutParams); badgeContainer.addView(target); badgeContainer.addView(this); if(isCenterVertical) { badgeContainer.setGravity(Gravity.CENTER_VERTICAL); } } boolean hasSetMargin = leftMargin>0||topMargin>0||rightMargin>0||bottomMargin>0; if (hasSetMargin&&getLayoutParams() instanceof ViewGroup.MarginLayoutParams) { ViewGroup.MarginLayoutParams p = (ViewGroup.MarginLayoutParams) getLayoutParams(); p.setMargins(leftMargin, topMargin, rightMargin, bottomMargin); setLayoutParams(p); } isSetup = true; } else if (target.getParent() == null) { throw new IllegalStateException("目标View不能没有父布局!"); } if(number==0){ setVisibility(INVISIBLE); }else{ setVisibility(VISIBLE); } } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { if (w > 0 && h > 0) { setMeasuredDimension(w, h); } else { throw new IllegalStateException("如果你自定义了小红点的宽高,就不能设置其宽高小于0 ,否则请不要设置!"); } } @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); //这里不用解释了 很简单 就是画一个圆形和文字 rect.left = 0; rect.top = 0; rect.right = getWidth(); rect.bottom = getHeight(); canvas.drawRoundRect(rect, getWidth() / 2, getWidth() / 2, mBackgroundPaint); if (type == Type.TYPE_TEXT) { float textWidth = getTextWidth(text, mTextPaint); float textHeight = getTextHeight(text, mTextPaint); canvas.drawText(text, getWidth() / 2 - textWidth / 2, getHeight() / 2 + textHeight / 2, mTextPaint); } } private float getTextWidth(String text, Paint p) { return p.measureText(text, 0, text.length()); } private float getTextHeight(String text, Paint p) { Rect rect = new Rect(); p.getTextBounds(text, 0, text.length(), rect); return rect.height(); } }
#使用示例:
public class Main2Activity extends AppCompatActivity { private TextView mVTypeA; private TextView mVTypeB; private TextView mVTypeC; private TextView mVTypeD; private ImageView mVTypeE; private TabLayout mTabLayout; private void initView() { mVTypeA = (TextView) findViewById(R.id.vTypeA); mVTypeB = (TextView) findViewById(R.id.vTypeB); mVTypeC = (TextView) findViewById(R.id.vTypeC); mVTypeD = (TextView) findViewById(R.id.vTypeD); mVTypeE = (ImageView) findViewById(R.id.vTypeE); mTabLayout = (TabLayout) findViewById(R.id.tabLayout); } @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main2); initView(); //情况A(有margin时) new BadgeHelper(this) .setBadgeType(BadgeHelper.Type.TYPE_POINT) .setBadgeOverlap(false) .bindToTargetView(mVTypeA); //情况B(有padding时) new BadgeHelper(this) .setBadgeType(BadgeHelper.Type.TYPE_POINT) .setBadgeOverlap(true, true)//重叠模式+忽略目标ViewPadding 效果, 什么意思? 你可以把第二个参数写成false看看会发生什么 .bindToTargetView(mVTypeB); //情况C(默认情况) BadgeHelper badgeHelperC = new BadgeHelper(this) .setBadgeType(BadgeHelper.Type.TYPE_TEXT) .setBadgeOverlap(false); badgeHelperC.bindToTargetView(mVTypeC); badgeHelperC.setBadgeNumber(6);//数字模式 //情况D(有权重时) new BadgeHelper(this) .setBadgeColor(0xff0f00ff)//顺便演示下 小红点颜色的设置 .setBadgeType(BadgeHelper.Type.TYPE_POINT) .setBadgeOverlap(false) .bindToTargetView(mVTypeD); //情况E(小红点与图片重叠)+ 数字模式 BadgeHelper badgeHelperE = new BadgeHelper(this) .setBadgeType(BadgeHelper.Type.TYPE_TEXT) .setBadgeOverlap(true, true);//注意 isIgnoreTargetPadding=true时 和 setBadgeMargins 不能同时使用 //.setBadgeSize(100,100)//设置小红点的大小, 如果未设置则使用默认宽高, 一般默认就好 //.setBadgeTextSize(15) //设置文本大小, 不设置 则使用默认, 一般默认就好 badgeHelperE.bindToTargetView(mVTypeE); //任意地方可以刷新数字 badgeHelperE.setBadgeNumber(58);//数字 //情况F(TabLayout兼容) BadgeHelper badgeHelperF = new BadgeHelper(this) .setBadgeType(BadgeHelper.Type.TYPE_TEXT) .setBadgeCenterVertical()//红点居中 .setBadgeMargins(10,0,0,0)//偏移一下 .setBadgeOverlap(false); badgeHelperF.bindToTargetView(mTabLayout, 0); badgeHelperF.setBadgeNumber(5); new BadgeHelper(this) .setBadgeType(BadgeHelper.Type.TYPE_POINT) .setBadgeCenterVertical()//红点居中 .setBadgeMargins(10,0,0,0)//偏移一下 .setBadgeOverlap(false) .bindToTargetView(mTabLayout,1); } }
#布局:
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" android:padding="16dp" tools:context="com.mx.test12.Main2Activity"> <TextView android:background="#220000ff" android:id="@+id/vTypeA" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_margin="20dp" android:text="情况A(有margin时)" /> <TextView android:background="#2200ff00" android:id="@+id/vTypeB" android:layout_width="wrap_content" android:layout_height="wrap_content" android:padding="30dp" android:text="情况B(有padding时)" /> <TextView android:id="@+id/vTypeC" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="情况C(默认情况)" /> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_gravity="center" android:gravity="center_vertical" android:orientation="horizontal"> <TextView android:background="#2200ffff" android:id="@+id/vTypeD" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:text="情况D(有权重时)" /> <View android:layout_width="0dp" android:layout_height="0dp" /> </LinearLayout> <ImageView android:id="@+id/vTypeE" android:layout_width="wrap_content" android:layout_height="wrap_content" android:contentDescription="情况E(与图片重叠)" android:padding="20dp" android:src="@mipmap/ic_launcher" /> <android.support.design.widget.TabLayout android:id="@+id/tabLayout" android:layout_width="match_parent" android:layout_height="55dp" app:layout_scrollFlags="scroll" app:tabIndicatorColor="#057523" app:tabIndicatorHeight="2.0dp" app:tabMode="fixed" app:tabSelectedTextColor="#057523" app:tabTextColor="#ced0d3"> <android.support.design.widget.TabItem android:layout_width="match_parent" android:layout_height="match_parent" android:text="聊天列表" /> <android.support.design.widget.TabItem android:layout_width="match_parent" android:layout_height="match_parent" android:text="好友列表" /> <android.support.design.widget.TabItem android:layout_width="match_parent" android:layout_height="match_parent" android:text="设置" /> </android.support.design.widget.TabLayout> </LinearLayout>
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