Android TextView Set Colorful text

In the application development often encountered the need to insert several different color text in a paragraph of the needs;

I used to use a number of TextView together, not only feel very stupid, operation is also quite disgusting;

Until the contact with the Spannablestringbuilder, feel the whole person is good;

When I set up the interface layout, there will be some default text with a string placeholder, such as: "The current temperature is:%s", "Today's weather:%1 $ s, High:%2$s, lowest temperature:%3$s, rainfall rate:%4$s,pm2.5:%5$s.";

Then, when the data is obtained, the direct String.Format (string target, string ... data) can insert the data in the corresponding position;

Recently encountered an inserted data to be replaced by another color requirements, think that the need should be more common, so wrote a tool class;

1 /**2 * TextView Color tool class3 * Created by me on 2015-08-10.4  */5  Public classTextviewcolorutil {6 7     /**8 * When the text content is "xxxxx%sxxxx" (a format placeholder) or "xxxx%1$sxxxx%2$x......xxxx%n$sxxxx" (multiple formatting placeholders), complete the formatting and set the newly added text color, At the same time can also set the original text color;9 * <p/>Ten * Note: Be sure to use the%s placeholder when using a single format, and use the%n$s placeholder when using multiple formats ; One * The number of placeholders must be the same as the number of strings you want to fill in; A      * -      * @paramtexts if the variable parameter length is 0, do not process; If the text length is 0, the default is "" -      * @paramDefaultcolorid r.color.xxx If you do not want to change the default color (the text color before the colon), you can fill in null the      * @paramNewcontentcolorid r.color.xxx -      */ -      Public Static voidSetsubcolortext (context context, TextView TV, Integer Defaultcolorid,intNewcontentcolorid, String ... texts) { -  +         if(Texts! =NULL) { -             if(Texts.length = = 1) {//single-format parameter conditions +                 if(Defaultcolorid! =NULL)//1. If you have set the default text color, give the change A Tv.settextcolor (Defaultcolorid); at  -String Text = texts[0]; -                 if(Stringutil.isempty (text))//2. If the text content is null or length 0, the default is "" -Text = ""; -  -String Origintext = Tv.gettext (). toString ();//3. Format, record the starting and ending index of the added string in                 intIndexstart = Origintext.indexof ("%s"); -                 intIndexend = Indexstart +text.length (); toString foo =String.Format (origintext, text); + Tv.settext (foo); -  the                 if(Indexend > Indexstart) {//4. If it is necessary to change color, perform *Spannablestringbuilder style =NewSpannablestringbuilder (foo); $Style.setspan (NewForegroundcolorspan (Context.getresources (). GetColor (Newcontentcolorid)), Indexstart, Indexend, Spannable.span _inclusive_exclusive);Panax Notoginseng Tv.settext (style); -                 } the  +}Else if(Texts.length > 1) {//Multi-format A                 if(Defaultcolorid! =NULL)//1. If you have set the default text color, give the change the Tv.settextcolor (Defaultcolorid); +  -                 int[] Indexesstart =New int[texts.length]; $                 int[] Indexesend =New int[texts.length]; $String Origintext =Tv.gettext (). toString (); -  -                  for(inti = 0; i < texts.length; i++) { theString Text =Texts[i]; -                     if(Stringutil.isempty (text)) {//2. If the text content is null or length 0, the default is ""WuyiText = ""; the                     } -  WuString regular = "%" + (i + 1) + "$s";//3. Format, record the starting and ending index of the added string -Indexesstart[i] =Origintext.indexof (regular); About                     if(I > 0) { $                         intIndexfix = 0; -                          for(intj = 0; J <= I-1; J + +) { -String formerregular = "%" + (j + 1) + "$s"; -Indexfix + = (Indexesend[j]-indexesstart[j])-formerregular.length (); A                         } +Indexesstart[i] + =Indexfix; the                     } -Indexesend[i] = Indexesstart[i] +text.length (); $                 } theString foo =String.Format (Origintext, (object[]) texts); the Tv.settext (foo); theSpannablestringbuilder style =NewSpannablestringbuilder (foo); the                  for(inti = 0; i < texts.length; i++) { -                     if(Indexesend[i] > Indexesstart[i])//4. If it is necessary to change color, perform inStyle.setspan (NewForegroundcolorspan (Context.getresources (). GetColor (Newcontentcolorid)), Indexesstart[i], Indexesend[i], spannable.span_inclusive_exclusive); the                 } the Tv.settext (style); About             } the         } the     } the}

Code

There is currently only one color, if there is a need for a different color for each inserted data ... It's a good change.

Change the incoming parameter int newcontentcolorid to int[] newcontentcolorids and then change the logic slightly to OK.

>_>

Let's take an example from the previous two examples:

1.

1 textview.settext ("The current temperature is:%s"); 2 textviewcolorutil.setsubcolortext (mainactivity.  thisnull, R.color.blue, "3°c");

"The current temperature is:%s"

2.

1 tv.settext ("Today's weather:%1 $ s, High:%2$s, lowest temperature:%3$s, rainfall rate:%4$s,pm2.5:%5$s." ); 2 textviewcolorutil.setsubcolortext (mainactivity.  thisnull, r.color.red, "clear", "22°c", "9°c", "47%", "19");

"Today's weather:%1 $ s, High:%2$s, lowest temperature:%3$s, rainfall rate:%4$s,pm2.5:%5$s."

Android TextView Set Colorful text