Question

我有一个简单的TextView选框（在LinearLayout内）。我需要每个字母都有不同的颜色。有谁知道我怎么能做到这一点？文本是预先定义的，因此如果需要，我可以对所有内容进行硬编码。这是我的TextView

  <TextView
        style="@style/myFont"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_weight="0.45"
        android:ellipsize="marquee"
        android:lines="1"
        android:marqueeRepeatLimit="marquee_forever"
        android:text="@string/my_text" />

说文字是“Hello world！我很高兴！”

Answer 1

使用Html.fromHtml()并设置文字。

randomColor = https://stackoverflow.com/a/4246400/1008278

XML格式列表＆gt;＆gt; https://gist.github.com/VenomVendor/6857539修改为StringArray

    String tempText = "Hello world! I am happy!"
    String[] tempTextArr = string.split("");
    String newText = "";
    String[] colors = getResources().getStringArray(R.array.color_n);

    for(int i = 0; i < tempTextArr.length; i++ )
    {
        if(!tempTextArr[i].equals(" "))
        {
            newText = newText + "<font color='"+colors[i]+"'>"+tempTextArr[i]+"</font>"
            //newText = newText + "<font color='"+randomColor+"'>"+tempTextArr[i]+"</font>"
        }
        else{
            newText = newText + " ";
        }
    }

    tv.setText(Html.fromHtml(newText));

Answer 2

你去：

class ColorSpan extends ReplacementSpan {

    private LinearGradient shader;

    @Override
    public int getSize(Paint paint, CharSequence text, int start, int end, FontMetricsInt fm) {
        float w = paint.measureText(text, start, end - start);
        int num = end - start;
        int[] colors = new int[num];
        float[] positions = new float[num];
        float cx = 0;
        float[] hsv = {
                0, 1, 1
        };
        for (int i = 0; i < num; i++) {
            float cw = paint.measureText(text, start+i, start+i+1);
            positions[i] = cx / w;
            cx += cw;
            hsv[0] = i * 360f / num;
            colors[i] = Color.HSVToColor(255, hsv);
        }
        Log.d(TAG, "getSize c " + Arrays.toString(colors));
        Log.d(TAG, "getSize p " + Arrays.toString(positions));
        Log.d(TAG, "getSize w " + w);
        shader = new LinearGradient(0, 0, w, 0, colors, positions, TileMode.CLAMP);
        return (int) w;
    }

    @Override
    public void draw(Canvas canvas, CharSequence text, int start, int end, float x, int top, int y, int bottom, Paint paint) {
        paint.setShader(shader);
        canvas.drawText(text, start, end, x, y, paint);
    }
}

在onCreate中测试：

    TextView tv = new TextView(this);
    tv.setTextSize(40);
    SpannableStringBuilder b = new SpannableStringBuilder("Hello World!");
    ColorSpan what = new ColorSpan();
    b.setSpan(what, 0, b.length()-1, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
    tv.setText(b);

    setContentView(tv);

Android字幕，每个字母都有不同的颜色

2 个答案: