Android中的自定义属性

一.自定义View中的自定义属性：

1.自定义View类文件：

package com.example.myapplication.Activity;

import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Color;
import android.util.AttributeSet;
import android.widget.TextView;

import androidx.annotation.Nullable;

import com.example.myapplication.R;

//解决extends TextView时候的标红线
import android.annotation.SuppressLint;
@SuppressLint("AppCompatCustomView")


public class CustomTextView extends TextView {

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

    public CustomTextView(Context context, @Nullable AttributeSet attrs) {
        super(context, attrs);
        TypedArray typedArray = context.obtainStyledAttributes(attrs, R.styleable.CustomTextView);
        int color = typedArray.getColor(R.styleable.CustomTextView_textColor, Color.RED);
        typedArray.recycle();
    }

    public CustomTextView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        TypedArray typedArray = context.obtainStyledAttributes(attrs, R.styleable.CustomTextView);
        int color = typedArray.getColor(R.styleable.CustomTextView_textColor, Color.RED);
        typedArray.recycle();
    }

    public CustomTextView(Context context, @Nullable AttributeSet attrs, int defStyleAttr, int defStyleRes) {
        super(context, attrs, defStyleAttr, defStyleRes);
        TypedArray typedArray = context.obtainStyledAttributes(attrs, R.styleable.CustomTextView);
        int color = typedArray.getColor(R.styleable.CustomTextView_textColor, Color.RED);
        typedArray.recycle();
    }
}

2.attrs.xml文件：

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <declare-styleable name="CustomTextView">
        <attr name="textColor" format="color"/>
    </declare-styleable>
</resources>

3.引入自定义View的时候获取自定义的属性：

<?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"
    tools:context=".Activity.MainActivity">

    <com.example.myapplication.Activity.CustomTextView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:textColor="@color/black" />


</LinearLayout>