Android学习笔记 1. TextView

Android学习笔记

Android基础开发——控件

1. TextView

官方文档：

https://developer.android.google.cn/reference/android/widget/TextView

1.1 基础属性

1.2 演示

<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    >

    <TextView
        android:id="@+id/tv_1"
        android:layout_width="200dp"
        android:layout_height="400dp"
        android:text="DingJiaxiong"
        android:textColor="@color/black"
        android:textStyle="bold"
        android:textSize="30sp"
        android:background="#ff5621"
        android:gravity="center"
        />
    
LinearLayout>
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1.3 带阴影的TextView

android:shadowRadius="3.0"
android:shadowColor="#ff3523"
android:shadowDx="10"
android:shadowDy="20"
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1.4 实现跑马灯效果的TextView

新建类MyTextView.java

package com.dingjiaxiong.mytextview;

import android.annotation.SuppressLint;
import android.content.Context;
import android.util.AttributeSet;
import android.widget.TextView;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;

@SuppressLint("AppCompatCustomView")
public class MyTextView extends TextView {

    public MyTextView(@NonNull Context context) {
        super(context);
    }

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

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

    @Override
    public boolean isFocused() {
        return true;
    }
}
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xml中更改控件

<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    >

    <com.dingjiaxiong.mytextview.MyTextView
        android:id="@+id/tv_1"
        android:layout_width="match_parent"
        android:layout_height="400dp"
        android:text="DingJiaxiong DingJiaxiong DingJiaxiong DingJiaxiong DingJiaxiong"
        android:textColor="@color/black"
        android:textStyle="bold"
        android:textSize="30sp"
        android:gravity="center"

        android:shadowRadius="3.0"
        android:shadowColor="#ff3523"
        android:shadowDx="10"
        android:shadowDy="20"

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

LinearLayout>
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运行

这里获取焦点可加可不加，加了效果一样。