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标题: 文字特效 [打印本页]

作者: admin 时间: 2014-2-13 16:56
标题: 文字特效
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可以考虑给文字加一些特效，这样看起来更酷

package com.asysbang.uidemo;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.EmbossMaskFilter;
import android.graphics.MaskFilter;
import android.graphics.Paint;
import android.os.Handler;
import android.os.Message;
import android.util.AttributeSet;
import android.view.View;

public class TextEffectView extends View {

private Paint textPaint;

   private MaskFilter  mEmboss;

private static final String text = "你好！今天是星期三！";

private static final int MSG_IN = 10;

private static final int EFFECT_SHOW_DELAY = 200;

private static final int TEXT_SIZE_1 = 80;

private static final int TEXT_SIZE_2 = 120;

private static final int START_X = 30;

private static final int START_Y = 400;

private int curPosition = 0;

private Handler mHandler = new Handler() {

      @Override
      public void handleMessage(Message msg) {
         curPosition++;
         if (curPosition <= text.length() * 2) {
            invalidate();
            mHandler.sendEmptyMessageDelayed(MSG_IN, EFFECT_SHOW_DELAY);
         }
      }

};

public TextEffectView(Context context, AttributeSet attrs) {
      super(context, attrs);
      textPaint = new Paint();
      textPaint.setColor(Color.CYAN);
      textPaint.setStyle(Paint.Style.STROKE);
      textPaint.setStrokeJoin(Paint.Join.ROUND);
      textPaint.setStrokeCap(Paint.Cap.ROUND);
      textPaint.setStrokeWidth(2);

      mEmboss = new EmbossMaskFilter(new float[] { 1, 1, 1 },
            0.4f, 6, 3.5f);
      textPaint.setMaskFilter(mEmboss);
}

@Override
protected void onDraw(Canvas canvas) {
      String str = text.substring(0, curPosition / 2);
      System.out.println("==========" + str);
      textPaint.setTextSize(TEXT_SIZE_1);
      canvas.drawText(str, START_X, START_Y, textPaint);
      if (curPosition % 2 > 0) {
         textPaint.setTextSize(TEXT_SIZE_2);
         String str1 = text.substring(curPosition / 2, curPosition / 2 + 1);
         canvas.drawText(str1, START_X / 2 + TEXT_SIZE_2 - TEXT_SIZE_1 + TEXT_SIZE_1 * curPosition / 2, START_Y, textPaint);
      }
}

public void textIn() {
      mHandler.removeMessages(MSG_IN);
      curPosition = 0;
      mHandler.sendEmptyMessage(MSG_IN);
}

}

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