如何在窗口小部件中使用自定义字体？

时间：2010-11-30 20:59:23

标签： android widget typeface

我有一个数字时钟小部件。如何使用资源/字体中的自定义字体作为显示时钟的textview中的默认字体？

这是我的代码：

    package android.tristan.widget.digiclock;

import java.util.Calendar;

import android.app.PendingIntent;
import android.app.Service;
import android.appwidget.AppWidgetManager;
import android.appwidget.AppWidgetProvider;
import android.content.BroadcastReceiver;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.IBinder;
import android.os.Vibrator;
import android.text.format.DateFormat;
import android.widget.RemoteViews;


public class DigiClock extends AppWidgetProvider {

    @Override
    public void onDisabled(Context context) {
        super.onDisabled(context);
        context.stopService(new Intent(context, UpdateService.class));
    }
    public void onReceive(Context context, Intent intent)
    {
        super.onReceive(context, intent);

        if(intent.getAction().equals("android.tristan.widget.digiclock.CLICK"))
        {
          Vibrator vibrator = (Vibrator) context.getSystemService(Context.VIBRATOR_SERVICE);
          vibrator.vibrate(50);           
            final Intent alarmClockIntent = new Intent(Intent.ACTION_MAIN, null);
            alarmClockIntent.addCategory(Intent.CATEGORY_LAUNCHER);
            final ComponentName cn = new ComponentName("com.android.deskclock", "com.android.deskclock.AlarmClock");
            alarmClockIntent.setComponent(cn);
            alarmClockIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
            context.startActivity(alarmClockIntent);
        }
        if(intent.getAction().equals("android.tristan.widget.digiclock.CLICK_2"))
        {
          Vibrator vibrator = (Vibrator) context.getSystemService(Context.VIBRATOR_SERVICE);
          vibrator.vibrate(50);
           final Intent calendarIntent = new Intent(Intent.ACTION_MAIN, null);
           calendarIntent.addCategory(Intent.CATEGORY_LAUNCHER);
            final ComponentName cn = new ComponentName("com.android.calendar", "com.android.calendar.LaunchActivity");
            calendarIntent.setComponent(cn);
            calendarIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
            context.startActivity(calendarIntent);       
        }
    }

    @Override
    public void onEnabled(Context context) {
        super.onEnabled(context);
        context.startService(new Intent(UpdateService.ACTION_UPDATE));
    }

    @Override
    public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {
        super.onUpdate(context, appWidgetManager, appWidgetIds);
        context.startService(new Intent(UpdateService.ACTION_UPDATE));
        final int Top = appWidgetIds.length;
        final int Bottom = appWidgetIds.length;
        for (int i=0; i<Top; i++)
        {
            int[] appWidgetId = appWidgetIds;
            RemoteViews top=new RemoteViews(context.getPackageName(), R.layout.main);
            Intent clickintent=new Intent("android.tristan.widget.digiclock.CLICK");
            PendingIntent pendingIntentClick=PendingIntent.getBroadcast(context, 0, clickintent, 0);
            top.setOnClickPendingIntent(R.id.TopRow, pendingIntentClick);
            appWidgetManager.updateAppWidget(appWidgetId, top);
        }
        for (int i=0; i<Bottom; i++)
        {
            int[] appWidgetId = appWidgetIds;
            RemoteViews bottom=new RemoteViews(context.getPackageName(), R.layout.main);
            Intent clickintent=new Intent("android.tristan.widget.digiclock.CLICK_2");
            PendingIntent pendingIntentClick=PendingIntent.getBroadcast(context, 0, clickintent, 0);
            bottom.setOnClickPendingIntent(R.id.BottomRow, pendingIntentClick);
            appWidgetManager.updateAppWidget(appWidgetId, bottom);
        }
}

    public static final class UpdateService extends Service {

       static final String ACTION_UPDATE = "android.tristan.widget.digiclock.action.UPDATE";

        private final static IntentFilter sIntentFilter;

        private final static String FORMAT_12_HOURS = "h:mm";
        private final static String FORMAT_24_HOURS = "kk:mm";

        private String mTimeFormat;
        private String mDateFormat;
        private String mDayFormat;
        private Calendar mCalendar;

        static {
            sIntentFilter = new IntentFilter();
            sIntentFilter.addAction(Intent.ACTION_TIME_TICK);
            sIntentFilter.addAction(Intent.ACTION_TIMEZONE_CHANGED);
            sIntentFilter.addAction(Intent.ACTION_TIME_CHANGED);
        }

        @Override
        public void onCreate() {
            super.onCreate();
            reinit();
            registerReceiver(mTimeChangedReceiver, sIntentFilter);
         }

        @Override
        public void onDestroy() {
            super.onDestroy();
            unregisterReceiver(mTimeChangedReceiver);
        }

        @Override
        public void onStart(Intent intent, int startId) {
            super.onStart(intent, startId);

            if (ACTION_UPDATE.equals(intent.getAction())) {
                update();
            }
        }

        @Override
        public IBinder onBind(Intent intent) {
            return null;
        }


        private void update() {
            mCalendar.setTimeInMillis(System.currentTimeMillis());
            final CharSequence time = DateFormat.format(mTimeFormat, mCalendar);
            final CharSequence date = DateFormat.format(mDateFormat, mCalendar);
            final CharSequence day = DateFormat.format(mDayFormat, mCalendar);

            RemoteViews views = new RemoteViews(getPackageName(), R.layout.main);
            views.setTextViewText(R.id.Time, time);
            views.setTextViewText(R.id.Day, day);
            views.setTextViewText(R.id.Date, date);

            ComponentName widget = new ComponentName(this, DigiClock.class);
            AppWidgetManager manager = AppWidgetManager.getInstance(this);
            manager.updateAppWidget(widget, views);
        }

        private void reinit() {
            mDayFormat = getString(R.string.day_format);
            mDateFormat = getString(R.string.date_format);
            mTimeFormat = is24HourMode(this) ? FORMAT_24_HOURS : FORMAT_12_HOURS;
            mCalendar = Calendar.getInstance();
        }

        private static boolean is24HourMode(final Context context) {
            return android.text.format.DateFormat.is24HourFormat(context);
        }

        private final BroadcastReceiver mTimeChangedReceiver = new BroadcastReceiver() {
            @Override
            public void onReceive(Context context, Intent intent) {
                final String action = intent.getAction();

                if (action.equals(Intent.ACTION_TIME_CHANGED) ||
                    action.equals(Intent.ACTION_TIMEZONE_CHANGED))
                {
                    reinit();
                }

                update();
            }
        };
    }
}

8 个答案:

答案 0 :(得分：60)

我们需要的是将字体渲染到画布上，然后将其传递给位图并将其指定给ImageView。像这样：

public Bitmap buildUpdate(String time) 
{
    Bitmap myBitmap = Bitmap.createBitmap(160, 84, Bitmap.Config.ARGB_4444);
    Canvas myCanvas = new Canvas(myBitmap);
    Paint paint = new Paint();
    Typeface clock = Typeface.createFromAsset(this.getAssets(),"Clockopia.ttf");
    paint.setAntiAlias(true);
    paint.setSubpixelText(true);
    paint.setTypeface(clock);
    paint.setStyle(Paint.Style.FILL);
    paint.setColor(Color.WHITE);
    paint.setTextSize(65);
    paint.setTextAlign(Align.CENTER);
    myCanvas.drawText(time, 80, 60, paint);
    return myBitmap;
}

这是使用字体进行图像处理的部分，这就是如何使用它：

String time = (String) DateFormat.format(mTimeFormat, mCalendar);
RemoteViews views = new RemoteViews(getPackageName(), R.layout.main);
views.setImageViewBitmap(R.id.TimeView, buildUpdate(time));

正如您可能会注意到的，此代码只显示了imageview中的当前时间，但可以轻松调整以满足任何需求。

修改

如documentation

中所述，ARGB_4444已被弃用于ARGB_8888
  

此字段在API级别13中已弃用。由于此配置质量较差，建议使用ARGB_8888。

答案 1 :(得分：14)

我对测量尺寸做了一点改动，因此位图将支持不同的字体大小。它只支持单行文本。

public static Bitmap getFontBitmap(Context context, String text, int color, float fontSizeSP) {
    int fontSizePX = convertDiptoPix(context, fontSizeSP);
    int pad = (fontSizePX / 9);
    Paint paint = new Paint();
    Typeface typeface = Typeface.createFromAsset(context.getAssets(), "Fonts/Roboto-Regular.ttf");
    paint.setAntiAlias(true);
    paint.setTypeface(typeface);
    paint.setColor(color);
    paint.setTextSize(fontSizePX);

    int textWidth = (int) (paint.measureText(text) + pad * 2);
    int height = (int) (fontSizePX / 0.75);
    Bitmap bitmap = Bitmap.createBitmap(textWidth, height, Bitmap.Config.ARGB_8888);
    Canvas canvas = new Canvas(bitmap);
    float xOriginal = pad;
    canvas.drawText(text, xOriginal, fontSizePX, paint);
    return bitmap;
}

public static int convertDiptoPix(Context context, float dip) {
    int value = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dip, context.getResources().getDisplayMetrics());
    return value;
}

答案 2 :(得分：8)

这会将字体呈现为位图，然后将位图分配给ImageView。

public static RemoteViews buildUpdate(Context context)
{
    RemoteViews views = new RemoteViews(context.getPackageName(), R.layout.main);
    Bitmap myBitmap = Bitmap.createBitmap(100, 50, Bitmap.Config.ARGB_4444);
    Canvas myCanvas = new Canvas(myBitmap);
    Paint paint = new Paint();
    Typeface clock = Typeface.createFromAsset(context.getAssets(),"Clockopia.ttf");
    paint.setAntiAlias(true);
    paint.setSubpixelText(true);
    paint.setTypeface(clock);
    paint.setStyle(Paint.Style.FILL);
    paint.setColor(Color.BLACK);
    paint.setTextSize(15);
    myCanvas.drawText("Test", 0, 20, paint);

    views.setImageViewBitmap(R.id.TimeView, myBitmap);

    return views;
}

答案 3 :(得分：3)

此解决方案将创建一个位图，该位图是拟合文本所需的确切大小。

/**
 * Creates and returns a new bitmap containing the given text.
 */
public static Bitmap createTextBitmap(final String text, final Typeface typeface, final float textSizePixels, final int textColour)
{
    final TextPaint textPaint = new TextPaint();
    textPaint.setTypeface(typeface);
    textPaint.setTextSize(textSizePixels);
    textPaint.setAntiAlias(true);
    textPaint.setSubpixelText(true);
    textPaint.setColor(textColour);
    textPaint.setTextAlign(Paint.Align.LEFT);
    Bitmap myBitmap = Bitmap.createBitmap((int) textPaint.measureText(text), (int) textSizePixels, Bitmap.Config.ARGB_8888);
    Canvas myCanvas = new Canvas(myBitmap);
    myCanvas.drawText(text, 0, myBitmap.getHeight(), textPaint);
    return myBitmap;
}

如其他地方所述，然后可以将位图分配给窗口小部件的ImageView。

final Bitmap textBitmap = createTextBitmap(text,
        FontManager.get().getTypeface("slab-serif", 0),
        context.getResources().getDimension(R.dimen.widget_font_size_large),
        context.getResources().getColor(R.color.widget_text)
);
views.setImageViewBitmap(R.id.widget_cardTextImage, textBitmap);

这样做的好处是可以生成一个永远不会低于或超过应该包含的文本的位图，这对于小部件很重要，因为它们的尺寸因设备和版本而异。

答案 4 :(得分：0)

我现在找不到，但我问了同样的问题并得到谷歌的回复，这是不可能的。您对AppWidgets的操作非常有限，例如，您只能使用某些UI小部件而不能使用自定义字体。

答案 5 :(得分：0)

无法将自定义字体设置为远程视图，因为您无权直接访问它们（它们不是应用程序的视图）。

但是您可以通过编程方式创建一个textView，它将所有您想要的属性，然后将其转换为Bitmap并将其设置为ImageView而不是TextView。

这是我之前使用的示例代码：

private fun createTextBitmap(text: String, typeface: Typeface, textSize: Float, textColour: Int): Bitmap? {

        val textView = TextView(mService)
        textView.isDrawingCacheEnabled = true
        textView.text = text
        textView.typeface = typeface
        textView.setTextColor(textColour)
        textView.textSize = textSize
        textView.layoutParams = LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.MATCH_PARENT)

        textView.measure(View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED),
                View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED))
        textView.layout(0, 0, textView.measuredWidth, textView.measuredHeight)

        return textView.getDrawingCache(true)
    }

答案 6 :(得分：-4)

remoteviews.setTextViewText(textview_id, new SpannableStringBuilder(Html.fromHtml("<b>"+some_text_vaeiable"+"</b>")) );

答案 7 :(得分：-14)

这是我在我的应用程序中执行的操作，也适用于小部件。

Typeface customfont = Typeface.createFromAsset(getAssets(), "fonts/somefont.ttf");
TextView textview = (TextView) findViewById(R.id.textview);
textview.setTypeface(customfont);
textview.setText("Hey custom font!");
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