Android 文字过长，横向滚动显示

1、Android TextView文字横向自动滚动(跑马灯)

TextView实现文字滚动需要以下几个要点：

• 1.文字长度长于可显示范围：android:singleLine="true"
• 2.设置可滚到，或显示样式：android:ellipsize="marquee"
• 3.自定义滚动的ScrollingTextView

2、XML布局

        <com.kana.crazytv.ui.customer.ScrollingTextView
            android:id="@+id/textview"
            android:layout_width="@dimen/ui_dp_400"
            android:layout_height="wrap_content"
            android:ellipsize="marquee"
            android:marqueeRepeatLimit="marquee_forever"
            android:singleLine="true"
            android:layout_marginBottom="@dimen/ui_dp_50"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintBottom_toBottomOf="parent"
            android:text="This is a long text that will be horizontally scrolled This is a long text that will be horizontally scrolled" />

3、ScrollingTextView

package com.kana.crazytv.ui.customer;

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

/**
 * 自定义文字横向滑动
 */
public class ScrollingTextView extends androidx.appcompat.widget.AppCompatTextView {
    public ScrollingTextView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }
    public ScrollingTextView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public ScrollingTextView(Context context) {
        super(context);
    }

    @Override
    protected void onFocusChanged(boolean focused, int direction,
                                  Rect previouslyFocusedRect) {
        if (focused) {
            super.onFocusChanged(focused, direction, previouslyFocusedRect);
        }
    }

    @Override
    public void onWindowFocusChanged(boolean focused) {
        if (focused) {
            super.onWindowFocusChanged(focused);
        }
    }

    @Override
    public boolean isFocused() {
        return true;
    }
}