Spanned

常用的常量：

SPAN_EXCLUSIVE_EXCLUSIVE  不包括前面，不包括后面

SPAN_EXCLUSIVE_INCLUSIVE  不包括前面，包括后面

SPAN_INCLUSIVE_EXCLUSIVE  包括前面，不包括后面

SPAN_INCLUSIVE_INCLUSIVE  包括前面，包括后面

但是在实际测试中，上面四种的结果都是一样的，实际上都等于不包括前面，包括后面，而字符串是以1开始的

常用的场合：

Spanned spanned = Html.fromHtml("这是一个<font color='#00ffff'>富文本</font>");
tv9.setText(spanned);

SpannableString

package com.example.teststring;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.SpannableStringBuilder;
import android.text.Spanned;
import android.text.style.AbsoluteSizeSpan;
import android.text.style.BackgroundColorSpan;
import android.text.style.CharacterStyle;
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.Menu;
import android.view.MenuItem;
import android.widget.TextView;public class MainActivity extends Activity {TextView tv1;TextView tv2;TextView tv3;TextView tv4;TextView tv5;TextView tv6;TextView tv7;TextView tv8;TextView tv9;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);tv1 = (TextView) findViewById(R.id.tv1);tv2 = (TextView) findViewById(R.id.tv2);tv3 = (TextView) findViewById(R.id.tv3);tv4 = (TextView) findViewById(R.id.tv4);tv5 = (TextView) findViewById(R.id.tv5);tv6 = (TextView) findViewById(R.id.tv6);tv7 = (TextView) findViewById(R.id.tv7);tv8 = (TextView) findViewById(R.id.tv8);tv9 = (TextView) findViewById(R.id.tv9);addUrlSpan();addBackColorSpan();addForeColorSpan();addFontSpan();addStyleSpan();addStrikeSpan();addUnderLineSpan();addImageSpan();addConbine();}/** * 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);  tv1.setText(spanString);}  /** * 文字背景颜色 */  private void addBackColorSpan() {  SpannableString spanString = new SpannableString("背景色");  BackgroundColorSpan span = new BackgroundColorSpan(Color.YELLOW);  spanString.setSpan(span, 0, 3, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);  tv2.setText(spanString); }  /** * 文字颜色 */  private void addForeColorSpan() {  SpannableString spanString = new SpannableString("字体色"); ForegroundColorSpan span = new ForegroundColorSpan(Color.BLUE);  spanString.setSpan(span, 0, 3, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);  tv3.setText(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);  tv4.setText(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);  tv5.setText(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);  tv6.setText(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);  tv7.setText(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);  tv8.setText(spanString);  }/** * 混合 */private void addConbine() {SpannableStringBuilder spannable = new SpannableStringBuilder("组合运用啊");  CharacterStyle span1 = new BackgroundColorSpan(Color.BLUE);  CharacterStyle span2 = new ForegroundColorSpan(Color.RED);  spannable.setSpan(span1, 0, 2, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);  spannable.setSpan(span2, 2, 4, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);  tv9.setText(spannable); }
}

文字转图片

package com.example.teststring;import android.app.Activity;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.text.Spannable;
import android.text.SpannableString;
import android.text.style.ImageSpan;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;public class Main2Activity extends Activity {TextView textView;EditText editText;Button button;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main2);textView = (TextView)findViewById(R.id.textView1);editText = (EditText)findViewById(R.id.editText1);button = (Button)findViewById(R.id.button1);button.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {Drawable drawable = getResources().getDrawable(R.drawable.ic_launcher);  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 String content = editText.getText().toString();SpannableString spannable = new SpannableString(content + "[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, content.length(), content.length() + "[smile]".length(), Spannable.SPAN_INCLUSIVE_EXCLUSIVE);    textView.setText(spannable);}});}
}

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