如何在android中的文本视图中的文本角中对齐*

Question

通常，当我们在文本之前给出*时，我看起来像（* hai）但是当在文本视图的字符串文件中使用相同的文本时，它看起来不一样。我想在textview的左上角设置*。

普通的setText（＆＃34; *清洁费适用＆＃34;）;不会把星号放在我想要的地方。

我希望输出像附加屏幕截图。请给我解决方案。

Answer 1

我用这个类来创建一个上标：

import android.text.TextPaint;
import android.text.style.MetricAffectingSpan;

/**
 * A Helper class to adjust the alignment in a textview or other text section,
 * used when SpannableStrings sets text dynamically.
 * 
 */
public class SuperscriptSpanAdjuster extends MetricAffectingSpan {
    double ratio = 0.5;

    public SuperscriptSpanAdjuster(double ratio) {
        this.ratio = ratio;
    }

    @Override
    public void updateMeasureState(TextPaint p) {
        p.baselineShift += (int) (p.ascent() * ratio);
    }

    @Override
    public void updateDrawState(TextPaint arg0) {
        arg0.baselineShift += (int) (arg0.ascent() * ratio);
    }
}

然后像这样使用它：

String temp = getString("*Cleaning Fee Applies");
SpannableString s = new SpannableString(temp);
s.setSpan(new SuperscriptSpanAdjuster(3.0/5.0), 0, 1, SpannableString.SPAN_EXCLUSIVE_EXCLUSIVE);
((TextView) this.findViewById(R.id.mytextView)).setText(s);

Answer 2

尝试以下代码：

text.setTransformationMethod(new AsteriskPasswordTransformationMethod());
public class AsteriskPasswordTransformationMethod extends PasswordTransformationMethod {
    @Override
    public CharSequence getTransformation(CharSequence source, View view) {
        return new PasswordCharSequence(source);
    }

    private class PasswordCharSequence implements CharSequence {
        private CharSequence mSource;
        public PasswordCharSequence(CharSequence source) {
            mSource = source; // Store char sequence
        }
        public char charAt(int index) {
            return '*'; // This is the important part
        }
        public int length() {
            return mSource.length(); // Return default
        }
        public CharSequence subSequence(int start, int end) {
            return mSource.subSequence(start, end); // Return default
        }
    }
};