Use placeholders in Android strings

The first is that Java can be used String.format(String format, Object... args) to implement

The second is the implementation via Android getResources().getString(int id, Object... formatArgs）

Placeholder syntax can refer to the Java documentation

The second method in a simple demonstration

Strings.xml

1 <stringname= "Boolean_conversion">Boolean:%1$b\n</string>2 <stringname= "String_conversion">String:%1$s\n</string>3 <stringname= "Integer_conversion">Integer:%1$d\n</string>4 <stringname= "Float_conversion">Float:%1$.2f\n</string>5 <stringname= "Date_or_time_conversion">Year:%1$ty, Month:%1$tm, DAY:%1$TD</string>

Mainactivity.java

1  Public classMainactivityextendsactionbaractivity {2 3 @Override4         protected voidonCreate (Bundle savedinstancestate) {5         Super. OnCreate (savedinstancestate);6 Setcontentview (r.layout.ac_main);7 8TextView Text =(TextView) Findviewbyid (r.id.ac_main_text);9StringBuilder Builder =NewStringBuilder ();Ten Builder.append ( OneGetresources (). getString (R.string.boolean_conversion,true)); A  - Builder.append ( -Getresources (). getString (r.string.string_conversion, "Hello World")); the  - Builder.append ( -Getresources (). getString (R.string.integer_conversion, 1234)); -  + Builder.append ( -Getresources (). getString (R.string.float_conversion, 1234.5678)); +  ACalendar Calendar =calendar.getinstance (); at Builder.append ( - getresources (). getString (r.string.date_or_time_conversion, calendar)); -  - Text.settext (builder.tostring ()); -     } -}