滚动TextView实现方法

21 November 2021 - less than 1 min read time
Tags: Android XML

方法1：无法自动获取焦点，需要android:clickable="true"，点击一下，开始滚动

<TextView
        android:id="@+id/textView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textColor="#98980709"
        android:gravity="center"
        android:text="TextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextView"
        android:textSize="50dp"

        android:singleLine="true"
        android:ellipsize="marquee"
        android:marqueeRepeatLimit="marquee_forever"
        android:focusable="true"
        android:focusableInTouchMode="true"
        android:clickable="true"
        
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
    </TextView>

方法2：自定义view，重写isFocused=true

<com.cg.cg1.constrainlayout.MyTV
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textColor="#98980709"
        android:gravity="center"
        android:text="TextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextView"
        android:textSize="50dp"

        android:singleLine="true"
        android:ellipsize="marquee"
        android:marqueeRepeatLimit="marquee_forever"
        android:focusable="true"
        android:focusableInTouchMode="true"
                                 
        android:singleLine="true"
        android:ellipsize="marquee"
        android:marqueeRepeatLimit="marquee_forever"
        android:focusable="true"
        android:focusableInTouchMode="true"
    </com.cg.cg1.constrainlayout.MyTV>

package com.cg.cg1.constrainlayout;

import android.content.Context;
import android.util.AttributeSet;

import androidx.annotation.Nullable;

public class MyTV extends androidx.appcompat.widget.AppCompatTextView{
    public MyTV(Context context) {
        super(context);
    }

    public MyTV(Context context, @Nullable AttributeSet attrs) {
        super(context, attrs);
    }

    public MyTV(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }

    @Override
    public boolean isFocused() {

        return true;
    }
}

方法3：使用requestFocus

<TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textColor="#98980709"
        android:gravity="center"
        android:text="TextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextView"
        android:textSize="50dp"

        android:singleLine="true"
        android:ellipsize="marquee"
        android:marqueeRepeatLimit="marquee_forever"
        android:focusable="true"
        android:focusableInTouchMode="true"
        <requestFocus/>
    </TextView>