[Android基础]Spanned与SpannableString

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;
	
	@Override
	protected 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;
	
	@Override
	protected 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() {
			
			@Override
			public 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);
			}
		});
	}
}