android设置字体

依赖框架：https://gitee.com/wasdzy/BasicFramework/releases/2.3.0.1
java代码

package cn.mrlong.fontsizechangedemo;
import androidx.appcompat.app.AppCompatActivity;
import android.content.res.Configuration;
import android.content.res.Resources;
import android.os.Build;
import android.os.Bundle;
import android.util.DisplayMetrics;
import android.view.View;
import android.widget.TextView;
import cn.mrlong.basicframework.base.BaseAppCompatActivity;
import cn.mrlong.basicframework.cview.FontSizeView;
import cn.mrlong.basicframework.utils.DensityUtils;
import cn.mrlong.basicframework.utils.SharedPreferencesUtils;
import static cn.mrlong.basicframework.utils.StaticConstUtils.FONT_SIZE_FILE;
import static cn.mrlong.basicframework.utils.StaticConstUtils.FONT_SIZE_VALUE;
import static cn.mrlong.basicframework.utils.StaticConstUtils.FONT_SIZE_VALUE_SP;
public class MainActivity extends BaseAppCompatActivity {
    private TextView textView;
    private float defaultTextSize;
    public int fontSzie;
    private float ztSize = 1;
    private int current;
    @Override
    public int setContentView() {
        return R.layout.activity_main;
    }
    @Override
    public void initView() {
        FontSizeView fontSizeView = findViewById(R.id.fontSize);
        textView = findViewById(R.id.testView);
        defaultTextSize = textView.getTextSize();
        //设置正常字体大小的倍数
        current = SharedPreferencesUtils.getInt(this, FONT_SIZE_FILE, "FONT_SIZE_VALUE_SP_current", 1);
        fontSizeView.setDefaultPosition((int) current);
        fontSizeView.setChangeCallbackListener(new FontSizeView.OnChangeCallbackListener() {
            @Override
            public void onChangeListener(int position) {
                if (current == position) return;
                current = position;
                fontSzie = position + 1;
                if (fontSzie == 1) {//小号字体
                    ztSize = 0.85f;
                } else if (fontSzie == 2) {//标准字体
                    ztSize = 1.0f;
                } else if (fontSzie == 3) {//中号字体
                    ztSize = 1.3f;
                } else if (fontSzie == 4) {//大号字体
                    ztSize = 1.5f;
                } else if (fontSzie == 5) {//超大字体
                    ztSize = 1.7f;
                } else if (fontSzie == 6) {//巨大字体
                    ztSize = 2f;
                }
                changeTextSize(ztSize);
                SharedPreferencesUtils.putFloat(MainActivity.this, FONT_SIZE_FILE, FONT_SIZE_VALUE_SP, (float) ztSize);
                SharedPreferencesUtils.putObject(MainActivity.this, FONT_SIZE_FILE, "FONT_SIZE_VALUE_SP_current", position);
            }
        });
    }
    @Override
    public void initData() {
    }
    @Override
    public void initListener() {
    }
    /**
     * 改变textsize 大小
     */
    private void changeTextSize(float dimension) {
        textView.setTextSize(DensityUtils.px2sp(this, defaultTextSize) * dimension);
    }
    @Override
    public void onClick(View v) {
    }
}

xml布局

<?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"
    android:orientation="vertical"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <TextView
        android:layout_weight="1"
        android:gravity="center|left"
        android:id="@+id/testView"
        android:text="安卓是一种基于Linux内核（不包含GNU组件）的自由及开放源代码的操作系统。主要使用于移动设备，如智能手机和平板电脑，由美国Google公司和开放手机联盟领导及开发。"
        android:layout_width="match_parent"
        android:layout_height="0dp" />

    <cn.mrlong.basicframework.cview.FontSizeView
        android:id="@+id/fontSize"
        android:layout_width="match_parent"
        android:layout_alignParentBottom="true"
        android:layout_height="200dp"
        android:minHeight="120dp"
        app:circleRadius="11dp"
        app:totalCount="3"
        app:lineColor="@color/colorAccent"
        app:standerSize="14" />
</LinearLayout>