android SpannableString使用详解

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;
"WHITE-SPACE: pre"> }
}
/**
* 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() {
SpannableString spanString = new SpannableString(" ");
Drawable d = getResources().getDrawable(R.drawable.ic_launcher);
d.setBounds(0, 0, d.getIntrinsicWidth(), d.getIntrinsicHeight());
ImageSpan span = new ImageSpan(d, ImageSpan.ALIGN_BASELINE);
spanString.setSpan(span, 0, 1, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
tv.append(spanString);
}
}

xml布局文件

[html] view plain copy

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#ff333333"
android:orientation="vertical" >
<EditText
android:id="@+id/tv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:singleLine="false"
android:inputType="none"/>
<GridLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:columnCount="4" >
<Button
android:id="@+id/image_btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/image" />
<Button
android:id="@+id/url_btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/url" />
<Button
android:id="@+id/color_btn1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/color1" />
<Button
android:id="@+id/color_btn2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/color2" />
<Button
android:id="@+id/font_btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/font" />
<Button
android:id="@+id/style_btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/style" />
<Button
android:id="@+id/strike_btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/strike" />
<Button
android:id="@+id/underline_btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/underline" />
GridLayout>
LinearLayout>

要完成这种效果，使用如下方法，传入26.5，让小数点后一位字体变小。记在这里，以后备用。

    private CharSequence getTempStr(String tempStr) {        if (TextUtils.isEmpty(tempStr))            return "";        int len = tempStr.length();        SpannableString spannableString = new SpannableString(tempStr);        AbsoluteSizeSpan span = new AbsoluteSizeSpan(45, true);        spannableString.setSpan(span, len - 1, len, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);        return spannableString;    }

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