在 Android 小部件中删除文本的子字符串

Question

我的 android 小部件中有一个文本视图，我只需要删除某些文本行。我在另一个 SO 问题中发现了这个以删除小部件中的文本：

RemoteViews views = new RemoteViews(context.getPackageName(), R.layout.new_app_widget);

// strike through text, this strikes through all text
views.setInt(R.id.appwidget_text, "setPaintFlags", Paint.STRIKE_THRU_TEXT_FLAG | Paint.ANTI_ALIAS_FLAG);

问题是这划掉了文本视图中的所有文本。如何只删除文本视图文本的一部分？

Answer 1

使用SpannableStringBuilder and StrikethroughSpan

例如，要获得以下效果，请参见下面的代码片段：

String firstWord = "Hello";
String secondWord = "World!";

TextView tvHelloWorld = (TextView)findViewById(R.id.tvHelloWorld);

// Create a span that will make the text red
ForegroundColorSpan redForegroundColorSpan = new ForegroundColorSpan(
    getResources().getColor(android.R.color.holo_red_dark));

// Use a SpannableStringBuilder so that both the text and the spans are mutable
SpannableStringBuilder ssb = new SpannableStringBuilder(firstWord);

// Apply the color span
ssb.setSpan(
    redForegroundColorSpan,            // the span to add
    0,                                 // the start of the span (inclusive)
    ssb.length(),                      // the end of the span (exclusive)
    Spanned.SPAN_EXCLUSIVE_EXCLUSIVE); // behavior when text is later inserted into the SpannableStringBuilder
                                       // SPAN_EXCLUSIVE_EXCLUSIVE means to not extend the span when additional
                                       // text is added in later

// Add a blank space
ssb.append(" ");

// Create a span that will strikethrough the text
StrikethroughSpan strikethroughSpan = new StrikethroughSpan();

// Add the secondWord and apply the strikethrough span to only the second word
ssb.append(secondWord);
ssb.setSpan(
    strikethroughSpan,
    ssb.length() - secondWord.length(),
    ssb.length(),
    Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);

// Set the TextView text and denote that it is Editable
// since it's a SpannableStringBuilder
tvHelloWorld.setText(ssb, TextView.BufferType.EDITABLE);

更多炫酷特效here

Answer 2

Xoce 的答案非常正确，但它更像是应用程序文本视图中的一般答案，但通过一些调整，我可以为小部件做到这一点。（也感谢 CommonsWare 将我推向正确的方向。

在updateAppWidget 方法中，您可以使用远程视图向textview 添加文本。要自定义带删除线的 textview 文本的子字符串，请使用 spannable string builder（您还可以使用不同的 span 来实现粗体、下划线、斜体等）

这是我所做的：

static void updateAppWidget(Context context, AppWidgetManager appWidgetManager,
                            int appWidgetId) {
    CharSequence widgetText = NewAppWidgetConfigureActivity.loadTitlePref(context, appWidgetId, NewAppWidgetConfigureActivity.TEXT_KEY);
    // Construct the RemoteViews object
    RemoteViews views = new RemoteViews(context.getPackageName(), R.layout.new_app_widget);

    SpannableStringBuilder spannableStringBuilder = new SpannableStringBuilder(widgetText);
    StrikethroughSpan strikethroughSpan = new StrikethroughSpan();

    spannableStringBuilder.setSpan(strikethroughSpan, startIndex, endIndex, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
    views.setTextViewText(R.id.appwidget_text, spannableStringBuilder);

    ...

}

在 Android 小部件中删除文本的子字符串

Strike through substring of text in Android widget

android

textview

widget

android-widget

strikethrough