仿抖音直播聊天室换行内容TextView+ReplacementSpan

一.抖音聊天室文本,看似简单并非简单


抖音文本换行.

二.实现方案TextView + ReplacementSpan

 方案思路

   利用span原理,继承ReplacementSpan,自定义VIewSpan。可以在TextView控件内自由添加外部VIew

 代码实现

   1.自定义ViewSpan

    import android.graphics.Canvas;

import android.graphics.Paint;

import android.text.style.ReplacementSpan;

import android.view.View;

import android.view.ViewGroup;

import androidx.annotation.NonNull;

import androidx.annotation.Nullable;

public class ViewSpanextends ReplacementSpan {

protected Viewview;

    public ViewSpan(View view ) {

super();

        this.view = view;

        this.view.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT));

    }

@Override

    public int getSize(@NonNull Paint paint, CharSequence text, int start, int end, @Nullable Paint.FontMetricsInt fm) {

int widthSpec = View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED);

        int heightSpec = View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED);

        view.measure(widthSpec, heightSpec);

        view.layout(0, 0, view.getMeasuredWidth(), view.getMeasuredHeight());

        if (fm !=null) {

int height =view.getMeasuredHeight();

            fm.ascent = fm.top = -height /2;

            fm.descent = fm.bottom = height /2;

        }

return view.getRight();

    }

@Override

    public void draw(@NonNull Canvas canvas, CharSequence text, int start, int end, float x, int top, int y, int bottom, @NonNull Paint paint) {

Paint.FontMetricsInt fm = paint.getFontMetricsInt();

        int transY = (y + fm.descent + y + fm.ascent) /2 -view.getMeasuredHeight() /2;//计算y方向的位移

        canvas.save();

        canvas.translate(x, transY);

        view.draw(canvas);

        canvas.restore();

    }

}

2.Adapter内拼装TextView

import android.text.Spannable;

import android.text.SpannableString;

import android.text.Spanned;

import android.text.method.LinkMovementMethod;

import android.text.style.ClickableSpan;

import android.view.LayoutInflater;

import android.view.View;

import android.widget.TextView;

import com.chad.library.adapter.base.BaseQuickAdapter;

import com.chad.library.adapter.base.viewholder.BaseViewHolder;

import com.rdc.player.R;

import org.jetbrains.annotations.NotNull;

import java.util.regex.Matcher;

import java.util.regex.Pattern;

import rdc.live.common.util.ToastUtils;

import rdc.live.common.util.UIUtils;

import rdc.live.common.widget.MarkerViewSpan;

import rdc.live.common.widget.RdcImageSpan;

public class RoomChatAdapterextends BaseQuickAdapter {

int selectItem =0;

    public RoomChatAdapter(){

super(R.layout.item_room_chat);

    }

@Override

    protected void convert(@NotNull BaseViewHolder helper, String item) {

TextView textView = helper.getView(R.id.chat_content);

      String tag ="#";

      String chatNmae =  tag+"隔壁老王:";

      String content  =",隔壁老妹快出来,我忍不住好想你,I love  you  and  wish you happy,";

      StringBuilder stringBuilder =new StringBuilder();

        stringBuilder.append(chatNmae).append(content);

        int chatNmaeIndex = stringBuilder.indexOf(chatNmae);

        SpannableString ss =new SpannableString(stringBuilder.toString());

        View view = LayoutInflater.from(getContext()).inflate(R.layout.layout_chat_front,null);

        MarkerViewSpan markerViewSpan =new MarkerViewSpan(view);

        ClickableSpan firstwordClick =new ClickableSpan() {

@Override

            public void onClick(View widget) {

ToastUtils.showLongToast("老妹点我干嘛!");

            }

};

        ss.setSpan(firstwordClick,chatNmaeIndex,chatNmaeIndex+chatNmae.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);

        Pattern pattern = Pattern.compile(tag);

        Matcher matcher = pattern.matcher(stringBuilder);

        while (matcher.find()) {

ss.setSpan(markerViewSpan,matcher.start(), matcher.end(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);

        }

textView.setLinksClickable(true);

        textView.setMovementMethod(LinkMovementMethod.getInstance());

        textView.setText(ss, TextView.BufferType.SPANNABLE);

        UIUtils.post(() -> {

textView.invalidate();

            textView.measure(0,0);

            textView.setWidth(textView.getMeasuredWidth());

        });

    }

}

3.附上xml文件

<?xml version="1.0" encoding="utf-8"?>

<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:app="http://schemas.android.com/apk/res-auto"

    xmlns:imagecontrol="http://schemas.android.com/apk/res-auto"

    android:layout_width="wrap_content"

    android:layout_height="wrap_content"

    >

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        app:layout_constraintLeft_toLeftOf="parent"

        app:layout_constraintTop_toTopOf="parent"

        android:layout_marginTop="3.5dp"

        android:orientation="horizontal"

        android:id="@+id/layout_member_tag">

            android:layout_width="17dp"

            android:layout_height="15dp"

            android:text="@string/master"

            android:textSize="10sp"

            android:textColor="@color/white"

            android:id="@+id/master"

            android:background="@drawable/room_chat_master_bg"

            android:gravity="center"

            android:visibility="gone"

            android:layout_marginLeft="5dp"

            >

            android:layout_width="17dp"

            android:layout_height="15dp"

            android:text="@string/manager"

            android:textSize="10sp"

            android:textColor="@color/white"

            android:id="@+id/manager"

            android:background="@drawable/room_chat_manager_bg"

            android:gravity="center"

            android:layout_marginLeft="5dp"

            >

            android:layout_width="wrap_content"

            android:layout_height="15dp"

            android:background="@drawable/room_chat_rank_good_bg"

            android:drawableLeft="@drawable/icon_rank_good"

            android:text="@string/rank_frist"

            android:textSize="9sp"

            android:textColor="@color/white"

            android:gravity="center"

            android:paddingLeft="3.5dp"

            android:paddingRight="4.5dp"

            android:layout_marginLeft="5dp"

            >

        android:layout_width="wrap_content"

        android:layout_height="15dp"

        android:background="@drawable/room_member_level_bg"

        android:layout_gravity="center_vertical"

        android:paddingLeft="3dp"

        android:paddingRight="4.5dp"

        android:layout_marginLeft="5dp"

        app:layout_constraintLeft_toRightOf="@id/layout_member_tag"

        app:layout_constraintTop_toTopOf="@id/layout_member_tag"

        android:id="@+id/layout_member_level"

        >

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:src="@drawable/icon_member_level"

            >

            android:layout_width="wrap_content"

            android:layout_height="match_parent"

            android:text="LV.8"

            android:textSize="9sp"

            android:textColor="@color/white"

            android:gravity="center"

            >


<?xml version="1.0" encoding="utf-8"?>

<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:app="http://schemas.android.com/apk/res-auto"

    xmlns:imagecontrol="http://schemas.android.com/apk/res-auto"

    android:layout_width="match_parent"

    android:layout_height="wrap_content"

    android:paddingEnd="100dp"

    >

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:id="@+id/chat_content"

        app:layout_constraintLeft_toLeftOf="parent"

        app:layout_constraintTop_toTopOf="parent"

        android:layout_marginLeft="6dp"

        android:textColor="@color/white"

        android:maxLines="10"

        >

4.我的实现效果如下


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