Initial sample with local provider

.gitignore

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+*.iml
+.gradle
+/local.properties
+/.idea
+.DS_Store
+/build
+/captures
+.externalNativeBuild

app/.gitignore

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+/build

app/build.gradle

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+apply plugin: 'com.android.application'
+
+android {
+    compileSdkVersion 26
+    buildToolsVersion "26.0.0"
+    defaultConfig {
+        applicationId "com.lalosoft.downloadablefontsdemo"
+        minSdkVersion 23
+        targetSdkVersion 26
+        versionCode 1
+        versionName "1.0"
+        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
+    }
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
+        }
+    }
+}
+
+dependencies {
+    implementation fileTree(dir: 'libs', include: ['*.jar'])
+    implementation 'com.android.support:appcompat-v7:26.0.1'
+    implementation 'com.android.support.constraint:constraint-layout:1.0.2'
+    testImplementation 'junit:junit:4.12'
+    androidTestImplementation 'com.android.support.test:runner:1.0.0'
+    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.0'
+}

app/proguard-rules.pro

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+# Add project specific ProGuard rules here.
+# By default, the flags in this file are appended to flags specified
+# in /Users/gonzalo/Library/Android/sdk/tools/proguard/proguard-android.txt
+# You can edit the include path and order by changing the proguardFiles
+# directive in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# Add any project specific keep options here:
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile

app/src/main/AndroidManifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="com.lalosoft.downloadablefontsdemo">
+
+    <application
+        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">
+        <activity android:name=".MainActivity">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+
+</manifest>

app/src/main/java/com/lalosoft/downloadablefontsdemo/MainActivity.java

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+package com.lalosoft.downloadablefontsdemo;
+
+import android.support.v7.app.AppCompatActivity;
+import android.os.Bundle;
+import android.view.View;
+import android.widget.Button;
+import android.widget.TextView;
+import android.widget.Toast;
+
+import com.lalosoft.downloadablefontsdemo.font.FontHandler;
+import com.lalosoft.downloadablefontsdemo.font.LocalFontProvider;
+
+public class MainActivity extends AppCompatActivity {
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_main);
+
+        final TextView title = findViewById(R.id.title);
+        final TextView text = findViewById(R.id.text);
+        Button applyFont = findViewById(R.id.apply_local_font_button);
+
+        applyFont.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View view) {
+                FontHandler fontHandler = new FontHandler.Builder()
+                        .provider(new LocalFontProvider(LocalFontProvider.DROID_SERIF))
+                        .addTextView(title, FontHandler.FontStyle.BOLD)
+                        .addTextView(text)
+                        .build();
+
+                fontHandler.applyFont(new FontHandler.FontHandlerCallback() {
+                    @Override
+                    public void onFontApplySuccess() {
+                        Toast.makeText(MainActivity.this,
+                                R.string.applied_font,
+                                Toast.LENGTH_SHORT)
+                                .show();
+                    }
+
+                    @Override
+                    public void onFontApplyError(Throwable e) {
+                        Toast.makeText(MainActivity.this,
+                                R.string.font_not_applied,
+                                Toast.LENGTH_SHORT)
+                                .show();
+                    }
+                });
+            }
+        });
+
+    }
+}

app/src/main/java/com/lalosoft/downloadablefontsdemo/font/FontHandler.java

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+package com.lalosoft.downloadablefontsdemo.font;
+
+import android.graphics.Typeface;
+import android.os.Handler;
+import android.widget.TextView;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class FontHandler {
+
+    private FontProvider provider;
+    private List<FontItem> fontItemList;
+
+    public enum FontStyle {
+        BOLD, ITALIC, REGULAR
+    }
+
+    public interface FontHandlerCallback {
+        void onFontApplySuccess();
+
+        void onFontApplyError(Throwable e);
+    }
+
+    private FontHandler(List<FontItem> fontItemList, FontProvider provider) {
+        this.fontItemList = fontItemList;
+        this.provider = provider;
+    }
+
+    public void applyFont(final FontHandlerCallback callback) {
+        new Handler().post(new Runnable() {
+            @Override
+            public void run() {
+                try {
+                    for (FontItem item : fontItemList) {
+                        Typeface typeface = provider.getTypeface(item.textView.getContext(),
+                                getStyleName(item.fontStyle));
+                        item.textView.setTypeface(typeface);
+                    }
+                    callback.onFontApplySuccess();
+                } catch (Exception e) {
+                    callback.onFontApplyError(e);
+                }
+            }
+        });
+    }
+
+    private String getStyleName(FontStyle fontStyle) {
+        return fontStyle.name().toLowerCase();
+    }
+
+    public static class Builder {
+        private FontProvider provider;
+        private List<FontItem> fontItemList;
+
+        public Builder() {
+            this.fontItemList = new ArrayList<>();
+        }
+
+        public Builder provider(FontProvider provider) {
+            this.provider = provider;
+            return this;
+        }
+
+        public Builder addTextView(TextView textView, FontStyle fontStyle) {
+            fontItemList.add(new FontItem(textView, fontStyle));
+            return this;
+        }
+
+        public Builder addTextView(TextView textView) {
+            fontItemList.add(new FontItem(textView));
+            return this;
+        }
+
+        public FontHandler build() {
+            return new FontHandler(fontItemList, provider);
+        }
+
+    }
+
+    private static class FontItem {
+        public TextView textView;
+        public FontStyle fontStyle;
+
+        public FontItem(TextView textView, FontStyle fontStyle) {
+            this.textView = textView;
+            this.fontStyle = fontStyle;
+        }
+
+        public FontItem(TextView textView) {
+            this.textView = textView;
+            this.fontStyle = FontStyle.REGULAR;
+        }
+    }
+}

app/src/main/java/com/lalosoft/downloadablefontsdemo/font/FontProvider.java

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+package com.lalosoft.downloadablefontsdemo.font;
+
+import android.content.Context;
+import android.graphics.Typeface;
+
+public interface FontProvider {
+    Typeface getTypeface(Context context, String fontStyleName);
+}

app/src/main/java/com/lalosoft/downloadablefontsdemo/font/LocalFontProvider.java

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+package com.lalosoft.downloadablefontsdemo.font;
+
+import android.content.Context;
+import android.graphics.Typeface;
+
+public class LocalFontProvider implements FontProvider {
+
+    // Droid Serif Font
+    private static final String DROID_SERIF_FOLDER = "fonts/droid_serif";
+    public static final String DROID_SERIF = DROID_SERIF_FOLDER + "/droid_serif-";
+
+    // Droid Sans Font
+    private static final String DROID_SANS_FOLDER = "fonts/droid_sans";
+    public static final String DROID_SANS = DROID_SANS_FOLDER + "/droid_sans-";
+
+    private String fontName;
+
+    public LocalFontProvider(String fontName) {
+        this.fontName = fontName;
+    }
+
+    @Override
+    public Typeface getTypeface(Context context, String fontStyleName) {
+        String name = fontName + fontStyleName + ".ttf";
+        return Typeface.createFromAsset(context.getAssets(), name);
+    }
+}

app/src/main/res/drawable/ic_launcher_background.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportHeight="108.0"
+    android:viewportWidth="108.0">
+    <path
+        android:fillColor="#26A69A"
+        android:pathData="M0,0h108v108h-108z"
+        android:strokeColor="#66FFFFFF"
+        android:strokeWidth="0.8" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,0L19,108"
+        android:strokeColor="#33FFFFFF"
+        android:strokeWidth="0.8" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M9,0L9,108"
+        android:strokeColor="#66FFFFFF"
+        android:strokeWidth="0.8" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M39,0L39,108"
+        android:strokeColor="#66FFFFFF"
+        android:strokeWidth="0.8" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M29,0L29,108"
+        android:strokeColor="#66FFFFFF"
+        android:strokeWidth="0.8" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M59,0L59,108"
+        android:strokeColor="#66FFFFFF"
+        android:strokeWidth="0.8" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M49,0L49,108"
+        android:strokeColor="#66FFFFFF"
+        android:strokeWidth="0.8" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M79,0L79,108"
+        android:strokeColor="#66FFFFFF"
+        android:strokeWidth="0.8" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M69,0L69,108"
+        android:strokeColor="#66FFFFFF"
+        android:strokeWidth="0.8" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M89,0L89,108"
+        android:strokeColor="#33FFFFFF"
+        android:strokeWidth="0.8" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M99,0L99,108"
+        android:strokeColor="#66FFFFFF"
+        android:strokeWidth="0.8" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,89L108,89"
+        android:strokeColor="#33FFFFFF"
+        android:strokeWidth="0.8" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,99L108,99"
+        android:strokeColor="#66FFFFFF"
+        android:strokeWidth="0.8" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,69L108,69"
+        android:strokeColor="#66FFFFFF"
+        android:strokeWidth="0.8" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,79L108,79"
+        android:strokeColor="#66FFFFFF"
+        android:strokeWidth="0.8" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,49L108,49"
+        android:strokeColor="#66FFFFFF"
+        android:strokeWidth="0.8" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,59L108,59"
+        android:strokeColor="#66FFFFFF"
+        android:strokeWidth="0.8" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,29L108,29"
+        android:strokeColor="#66FFFFFF"
+        android:strokeWidth="0.8" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,39L108,39"
+        android:strokeColor="#66FFFFFF"
+        android:strokeWidth="0.8" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,19L108,19"
+        android:strokeColor="#33FFFFFF"
+        android:strokeWidth="0.8" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,9L108,9"
+        android:strokeColor="#66FFFFFF"
+        android:strokeWidth="0.8" />
+</vector>
+