Android 使用第三方字体

先看下图

一.全局替换方式

1.新建assets引入资源

2. 自定义application，将第三方的字体，替换当前系统默认字体

class App : Application() {override fun onCreate() {super.onCreate()initTypeface()}private fun initTypeface() {val typefaceBysong = Typeface.createFromAsset(assets, "fonts/bysong.ttf")val monospace = Typeface::class.java.getDeclaredField("MONOSPACE")monospace.isAccessible = truemonospace.set(null, typefaceBysong)}
}

3.定义app的style（主要是<item name="android:typeface">monospace</item>）

<resources xmlns:tools="http://schemas.android.com/tools"><!-- Base application theme. --><style name="Theme.Study" parent="Theme.MaterialComponents.DayNight.DarkActionBar"><!-- Primary brand color. --><item name="colorPrimary">@color/purple_500</item><item name="colorPrimaryVariant">@color/purple_700</item><item name="colorOnPrimary">@color/white</item><!-- Secondary brand color. --><item name="colorSecondary">@color/teal_200</item><item name="colorSecondaryVariant">@color/teal_700</item><item name="colorOnSecondary">@color/black</item><!-- Status bar color. --><item name="android:statusBarColor" tools:targetApi="l">?attr/colorPrimaryVariant</item><!-- Customize your theme here. --></style><style name="AppTheme.NoActionBar" parent="Theme.Study"><item name="windowActionBar">false</item><item name="windowNoTitle">true</item><item name="android:typeface">monospace</item></style>
</resources>

4.设置在manifests文件中设置application，替换theme="@style/AppTheme.NoActionBar"

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"package="com.ming.widgets"><applicationandroid:name=".App"android:allowBackup="true"android:icon="@mipmap/ic_launcher"android:label="@string/app_name"android:roundIcon="@mipmap/ic_launcher_round"android:supportsRtl="true"android:theme="@style/AppTheme.NoActionBar"><activityandroid:name=".FontActivity"android:exported="true"><intent-filter><action android:name="android.intent.action.MAIN" /><category android:name="android.intent.category.LAUNCHER" /></intent-filter></activity></application></manifest>

这样全部都替换成第三方字体，对于字体因为太大而导致的问题，可以将字体的扩展名改成zip或者jpg就会解决。

二.单个TextView替换

1.对每个TextView调用 setTypeface(@Nullable Typeface tf)方法

class FontActivity : AppCompatActivity() {private lateinit var mBinding: ActivityFontBindingoverride fun onCreate(savedInstanceState: Bundle?) {super.onCreate(savedInstanceState)mBinding = ActivityFontBinding.inflate(LayoutInflater.from(this))setContentView(mBinding.root)//得到AssetManagerval typefaceBysong = Typeface.createFromAsset(assets, "fonts/bysong.ttf")//设置字体mBinding.textViewThird.typeface = typefaceBysong}
}

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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=".FontActivity"><TextViewandroid:id="@+id/textViewThird"android:layout_width="wrap_content"android:layout_height="wrap_content"app:layout_constraintBottom_toBottomOf="parent"app:layout_constraintTop_toTopOf="parent"app:layout_constraintEnd_toEndOf="parent"app:layout_constraintStart_toStartOf="parent"android:text="三方字体文字"/><TextViewandroid:id="@+id/textViewNormal"android:layout_marginTop="100dp"android:layout_width="wrap_content"android:layout_height="wrap_content"app:layout_constraintBottom_toBottomOf="parent"app:layout_constraintTop_toTopOf="parent"app:layout_constraintEnd_toEndOf="parent"app:layout_constraintStart_toStartOf="parent"android:text="普通文字"/>
</androidx.constraintlayout.widget.ConstraintLayout>

但是这样未免有些麻烦，需要对每个TextView调用 setTypeface(@Nullable Typeface tf)方法，于是还可以这样

2在res资源文件夹下新建font文件夹，将三方字体资源文件导入

对TextView添加android:fontFamily="@font/fzkatong"标签即可

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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=".FontActivity"><TextViewandroid:id="@+id/textViewResFont"android:layout_marginTop="200dp"android:layout_width="wrap_content"android:layout_height="wrap_content"app:layout_constraintBottom_toBottomOf="parent"app:layout_constraintTop_toTopOf="parent"app:layout_constraintEnd_toEndOf="parent"app:layout_constraintStart_toStartOf="parent"android:fontFamily="@font/fzkatong"android:text="引用Res/Font下资源的文字"/>
</androidx.constraintlayout.widget.ConstraintLayout>