Android 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;
}

/**
* <p>Set font file fontPath</p>
* @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<String, SoftReference<Typeface>> 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<Typeface> 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<Typeface> 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