android SpannableString 使用详解(给文本添加效果)

import android.app.Activity;
import android.graphics.Color;
import android.graphics.Typeface;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.text.Spannable;
import android.text.SpannableString;
import android.text.style.AbsoluteSizeSpan;
import android.text.style.BackgroundColorSpan;
import android.text.style.ForegroundColorSpan;
import android.text.style.ImageSpan;
import android.text.style.StrikethroughSpan;
import android.text.style.StyleSpan;
import android.text.style.URLSpan;
import android.text.style.UnderlineSpan;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;

public class SpannableStringActivity extends Activity implements OnClickListener {

private EditText tv;
private Button underline_btn;
private Button strike_btn;
private Button style_btn;
private Button font_btn;
private Button color_btn1;
private Button color_btn2;
private Button url_btn;
private Button image_btn;

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);

tv = (EditText) this.findViewById(R.id.tv);
underline_btn = (Button) this.findViewById(R.id.underline_btn);
strike_btn = (Button) this.findViewById(R.id.strike_btn);
style_btn = (Button) this.findViewById(R.id.style_btn);
font_btn = (Button) this.findViewById(R.id.font_btn);
color_btn1 = (Button) this.findViewById(R.id.color_btn1);
color_btn2 = (Button) this.findViewById(R.id.color_btn2);
url_btn = (Button) this.findViewById(R.id.url_btn);
image_btn = (Button) this.findViewById(R.id.image_btn);

underline_btn.setOnClickListener(this);
strike_btn.setOnClickListener(this);
style_btn.setOnClickListener(this);
font_btn.setOnClickListener(this);
color_btn1.setOnClickListener(this);
color_btn2.setOnClickListener(this);
url_btn.setOnClickListener(this);
image_btn.setOnClickListener(this);
}

@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.underline_btn:
addUnderLineSpan();
break;
case R.id.strike_btn:
addStrikeSpan();
break;
case R.id.style_btn:
addStyleSpan();
break;
case R.id.font_btn:
addFontSpan();
break;
case R.id.color_btn1:
addForeColorSpan();
break;
case R.id.color_btn2:
addBackColorSpan();
break;
case R.id.url_btn:
addUrlSpan();
break;
case R.id.image_btn:
addImageSpan();
break;
<span style="white-space:pre">	</span>}
}

/**
* 超链接
*/
private void addUrlSpan() {
SpannableString spanString = new SpannableString("超链接");
URLSpan span = new URLSpan("tel:0123456789");
spanString.setSpan(span, 0, 3, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
tv.append(spanString);
}

/**
* 文字背景颜色
*/
private void addBackColorSpan() {
    SpannableString spanString = new SpannableString("颜色2");
    BackgroundColorSpan span = new BackgroundColorSpan(Color.YELLOW);
    spanString.setSpan(span, 0, 3, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
    tv.append(spanString);
}

/**
* 文字颜色
*/
private void addForeColorSpan() {
SpannableString spanString = new SpannableString("颜色1");
ForegroundColorSpan span = new ForegroundColorSpan(Color.BLUE);
spanString.setSpan(span, 0, 3, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
tv.append(spanString);
}

/**
* 字体大小
*/
private void addFontSpan() {
SpannableString spanString = new SpannableString("36号字体");
AbsoluteSizeSpan span = new AbsoluteSizeSpan(36);
spanString.setSpan(span, 0, 5, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
tv.append(spanString);
}

/**
* 粗体，斜体
*/
private void addStyleSpan() {
SpannableString spanString = new SpannableString("BIBI");
StyleSpan span = new StyleSpan(Typeface.BOLD_ITALIC);
spanString.setSpan(span, 0, 2, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
tv.append(spanString);
}

/**
* 删除线
*/
private void addStrikeSpan() {
SpannableString spanString = new SpannableString("删除线");
StrikethroughSpan span = new StrikethroughSpan();
spanString.setSpan(span, 0, 3, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
tv.append(spanString);
}

/**
* 下划线
*/
private void addUnderLineSpan() {
SpannableString spanString = new SpannableString("下划线");
UnderlineSpan span = new UnderlineSpan();
spanString.setSpan(span, 0, 3, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
tv.append(spanString);
}

/**
* 图片
*/
private void addImageSpan() {
Drawable drawable = getResources().getDrawable(id);
drawable.setBounds(0, 0, drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight());
//需要处理的文本，[smile]是需要被替代的文本
SpannableString spannable = new SpannableString(getText().toString()+"[smile]");
//要让图片替代指定的文字就要用ImageSpan
ImageSpan span = new ImageSpan(drawable, ImageSpan.ALIGN_BASELINE);
//开始替换，注意第2和第3个参数表示从哪里开始替换到哪里替换结束（start和end）
//最后一个参数类似数学中的集合,[5,12)表示从5到12，包括5但不包括12
spannable.setSpan(span, getText().length(),getText().length()+"[smile]".length(), Spannable.SPAN_INCLUSIVE_EXCLUSIVE);  
setText(spannable);}
}