我正在尝试通过自定义字体更改 android 片段中多个文本视图的默认字体。完成此操作的代码位于片段的 onCreateView 中,如下所示:
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View v = inflater.inflate(R.layout.fragment_interest, container, false);
TextView txt1 = (TextView)v.findViewById(R.id.textView1);
TextView txt2 = (TextView)v.findViewById(R.id.textView2);
Typeface font = Typeface.createFromAsset(getActivity().getAssets(), "fonts/HoneyScript-SemiBold.ttf");
txt1.setTypeface(font);
txt2.setTypeface(font);
return v;
}
如果我只更改单个文本视图的字体,但尝试更改多个文本视图的字体,如上面的代码所示,则代码有效,我收到 NullPointerException 错误:
java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.TextView.setTypeface(android.graphics.Typeface)' on a null object reference
at layout.InterestFragment.onCreateView(InterestFragment.java:81)
at android.support.v4.app.Fragment.performCreateView(Fragment.java:1962)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1067)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1248)
at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:738)
at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1613)
at android.support.v4.app.FragmentController.execPendingActions(FragmentController.java:330)
at android.support.v4.app.FragmentActivity.onStart(FragmentActivity.java:547)
at com.android.niraj.financialcalculator.MainActivity.onStart(MainActivity.java:221)
at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1237)
at android.app.Activity.performStart(Activity.java:6253)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2379)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)
at android.app.ActivityThread.-wrap11(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
我是Java和Android编程的新手。请帮助我找到使用自定义字体更改片段中所有文本视图的解决方案。提前感谢!!
添加此行
textview.setTypeface(GloabalTypeface._globalTypeface(this, "Roboto-Light"));
在这里,我使用的是"机器人光"这种字体样式
您可以使用书法来做到这一点。(当某件事已经完成时,为什么要重新发明轮子)
包括依赖项
dependencies {
compile 'uk.co.chrisjenx:calligraphy:2.2.0'
}
将自定义字体添加到资产/所有字体定义都与此路径相关。
使用 CalligraphyConfig 在 #onCreate() 方法的应用程序类中定义默认字体。
@Override
public void onCreate() {
super.onCreate();
CalligraphyConfig.initDefault(new CalligraphyConfig.Builder()
.setDefaultFontPath("fonts/Roboto-RobotoRegular.ttf")
.setFontAttrId(R.attr.fontPath)
.build()
);
//....
}
包装活动上下文:
@Override
protected void attachBaseContext(Context newBase) {
super.attachBaseContext(CalligraphyContextWrapper.wrap(newBase));
}
你很好!
<TextView
android:text="@string/hello_world"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
fontPath="fonts/Roboto-Bold.ttf"/>
只需通过将父视图作为参数传递来调用这些方法。
private void overrideFonts(final Context context, final View v) {
try {
if (v instanceof ViewGroup) {
ViewGroup vg = (ViewGroup) v;
for (int i = 0; i < vg.getChildCount(); i++) {
View child = vg.getChildAt(i);
overrideFonts(context, child);
}
} else if (v instanceof TextView ) {
((TextView) v).setTypeface(Typeface.createFromAsset(context.getAssets(), "font.ttf"));
}
} catch (Exception e) {
}
}
应用字体以不在运行时查看自身(最佳性能)
public class MyTextView extends TextView {
public MyTextView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
init();
}
public MyTextView(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}
public MyTextView(Context context) {
super(context);
init();
}
private void init() {
if (!isInEditMode()) {
Typeface tf = Typeface.createFromAsset(getContext().getAssets(), "font.ttf");
setTypeface(tf);
}
}
}
尝试查找View
中的所有TextView
并更改每个的字体:
for( int i = 0; i < mainView.getChildCount(); i++ ){
if( mainView.getChildAt( i ) instanceof TextView )
mainView.getChildAt( i ).setTypeface(GloabalTypeface._globalTypeface(this, "Roboto-Light"));
}