Android(安卓)studio中TextView改变字体的两种方式（如仿宋、隶书）

在Android中系统默认的字体有三种，通过在TextView中加上android:typeface=”sans”来改变，而sans就是三种当中的其中的一种，还有两种分别是“monospace”和“serif”；当我们不想用着三种方式的话还可以使用外在的字体—–导入字体文件

使用外在字体的方式有很多，下面简单分享一下使用外在字体其中的两种方式，效果图：

第一种方式：在代码中定义TextView的字体
步骤：
1、我们首先在src/main文件下创建assets文件夹，为了规范起见，我们再在assets文件夹下创建font文件夹，然后将我们的字体文件(*.ttf)放进fonts文件夹下，如图所示：

2、在我们的布局文件中做准备工作，拖入一个TextView控件

3、在代码中找到我们导进来的字体并在TextView上使用

效果：

第二种方式：写一个类继承TextView，所有的东西都放入到这个类里面，在要用到换字体的地方就使用这个类
步骤：
1，新建一个类，让这个类继承TextView

/** * 1.version: * 2.date:2017/1/13 15:26 * 3.update:2017/1/13. * 4.autour:张玉杰 */import android.content.Context;import android.content.res.TypedArray;import android.text.TextUtils;import android.util.AttributeSet;import android.widget.TextView;/** * Created by Administrator on 2015/10/27. */public class FontTextView extends TextView {    /** The file name of the font data in the assets directory*/    private String mFontPath = null;    public FontTextView(Context context) {        super(context);        init(context, null, 0);    }    public FontTextView(Context context, AttributeSet attrs) {        super(context, attrs);        init(context, attrs, 0);    }    public FontTextView(Context context, AttributeSet attrs, int defStyleAttr) {        super(context, attrs, defStyleAttr);        init(context, attrs, defStyleAttr);    }    public String getFontPath() {        return mFontPath;    }    /**     * Set font file fontPath
     * @param fontPath The file name of the font data in the assets directory     */    public void setFontPath(String fontPath) {        mFontPath = fontPath;        if (!TextUtils.isEmpty(mFontPath)) {            FontUtils.getInstance().replaceFontFromAsset(this, mFontPath);        }    }    private void init(Context context, AttributeSet attrs, int defStyleAttr) {        TypedArray typedArray = context.obtainStyledAttributes(attrs, R.styleable.FontTextView, defStyleAttr, 0);        mFontPath = typedArray.getString(R.styleable.FontTextView_font_path);        typedArray.recycle();        if (!TextUtils.isEmpty(mFontPath)) {            FontUtils.getInstance().replaceFontFromAsset(this, mFontPath);        }    }}

2、在写一个类用来选择字体

/** * 1.version: * 2.date:2017/1/13 15:27 * 3.update:2017/1/13. * 4.autour:张玉杰 */import android.content.Context;import android.graphics.Typeface;import android.support.annotation.NonNull;import android.view.View;import android.view.ViewGroup;import android.widget.TextView;import java.lang.ref.SoftReference;import java.lang.reflect.Field;import java.util.HashMap;import java.util.Map;public class FontUtils {    private static final String TAG = FontUtils.class.getSimpleName();    private Map> mCache = new HashMap<>();    private static FontUtils sSingleton = null;    public static Typeface DEFAULT = Typeface.DEFAULT;    // disable instantiate    private FontUtils() {    }    public static FontUtils getInstance() {        // double check        if (sSingleton == null) {            synchronized (FontUtils.class) {                if (sSingleton == null) {                    sSingleton = new FontUtils();                }            }        }        return sSingleton;    }    public void replaceFontFromAsset(@NonNull View root, @NonNull String fontPath) {        replaceFont(root, createTypefaceFromAsset(root.getContext(), fontPath));    }    public void replaceFontFromAsset(@NonNull View root, @NonNull String fontPath, int style) {        replaceFont(root, createTypefaceFromAsset(root.getContext(), fontPath), style);    }    public void replaceFontFromFile(@NonNull View root, @NonNull String fontPath) {        replaceFont(root, createTypefaceFromFile(fontPath));    }    public void replaceFontFromFile(@NonNull View root, @NonNull String fontPath, int style) {        replaceFont(root, createTypefaceFromFile(fontPath), style);    }    private void replaceFont(@NonNull View root, @NonNull Typeface typeface) {        if (root == null || typeface == null) {            return;        }        if (root instanceof TextView) { // If view is TextView or it's subclass, replace it's font            TextView textView = (TextView) root;            // Extract previous style of TextView            int style = Typeface.NORMAL;            if (textView.getTypeface() != null) {                style = textView.getTypeface().getStyle();            }            textView.setTypeface(typeface, style);        } else if (root instanceof ViewGroup) { // If view is ViewGroup, apply this method on it's child views            ViewGroup viewGroup = (ViewGroup) root;            for (int i = 0; i < viewGroup.getChildCount(); ++i) {                replaceFont(viewGroup.getChildAt(i), typeface);            }        } // else return    }    private void replaceFont(@NonNull View root, @NonNull Typeface typeface, int style) {        if (root == null || typeface == null) {            return;        }        if (style < 0 || style > 3) {            style = Typeface.NORMAL;        }        if (root instanceof TextView) { // If view is TextView or it's subclass, replace it's font            TextView textView = (TextView) root;            textView.setTypeface(typeface, style);        } else if (root instanceof ViewGroup) { // If view is ViewGroup, apply this method on it's child views            ViewGroup viewGroup = (ViewGroup) root;            for (int i = 0; i < viewGroup.getChildCount(); ++i) {                replaceFont(viewGroup.getChildAt(i), typeface, style);            }        } // else return    }    private Typeface createTypefaceFromAsset(Context context, String fontPath) {        SoftReference typefaceRef = mCache.get(fontPath);        Typeface typeface = null;        if (typefaceRef == null || (typeface = typefaceRef.get()) == null) {            typeface = Typeface.createFromAsset(context.getAssets(), fontPath);            typefaceRef = new SoftReference<>(typeface);            mCache.put(fontPath, typefaceRef);        }        return typeface;    }    private Typeface createTypefaceFromFile(String fontPath) {        SoftReference typefaceRef = mCache.get(fontPath);        Typeface typeface = null;        if (typefaceRef == null || (typeface = typefaceRef.get()) == null) {            typeface = Typeface.createFromFile(fontPath);            typefaceRef = new SoftReference<>(typeface);            mCache.put(fontPath, typefaceRef);        }        return typeface;    }    public void replaceSystemDefaultFontFromAsset(@NonNull Context context, @NonNull String fontPath) {        replaceSystemDefaultFont(createTypefaceFromAsset(context, fontPath));    }    public void replaceSystemDefaultFontFromFile(@NonNull Context context, @NonNull String fontPath) {        replaceSystemDefaultFont(createTypefaceFromFile(fontPath));    }    private void replaceSystemDefaultFont(@NonNull Typeface typeface) {        modifyObjectField(null, "MONOSPACE", typeface);    }    private void modifyObjectField(Object obj, String fieldName, Object value) {        try {            Field defaultField = Typeface.class.getDeclaredField(fieldName);            defaultField.setAccessible(true);            defaultField.set(obj, value);        } catch (NoSuchFieldException e) {            e.printStackTrace();        } catch (IllegalAccessException e) {            e.printStackTrace();        }    }}

3、在布局文件里面直接用上类的全类名，这样在实时视图里面就能看到效果

效果图：

项目地址：
http://download.csdn.net/detail/lanrenxiaowen/9737027

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