Featured recommendation: Detailed explanation of the use of xUtils framework

Introduction to xUtils

xUtils was originally derived from the Afinal framework, and has undergone a lot of refactoring, making xUtils support large file uploads, more comprehensive http request protocol support (10 predicates), more flexible ORM, more event annotation support and not affected by confusion...

xUtils is compatible with Android 2.2 (API level 8). Currently xUtils has four main modules:

DbUtils Module

The orm framework in android can add, delete, modify and check with one line of code;

Support transactions, closed by default;

You can customize table names, column names, foreign keys, unique constraints, NOT NULL constraints, CHECK constraints, etc. through annotations (please annotate table names and column names when confusion is required);

Supports binding foreign keys. When saving an entity, the foreign key-associated entity is automatically saved or updated.

ViewUtils Module

The IOC framework in Android can perform UI, resource and event binding completely through annotations;

New event binding method, which can still work normally after being obfuscated by obfuscation tools;

HttpUtils Module

Support synchronous and asynchronous requests;

Support large file upload, no OOM when uploading large files;

Support GET, POST, PUT, MOVE, COPY, DELETE, HEAD, OPTIONS, TRACE, CONNECT requests;

BitmapUtils Module

 When loading a bitmap, you don't need to consider the OOM that occurs during the bitmap loading process and the image misalignment that occurs when the Android container slides quickly; 
 
 Support loading network pictures and local pictures; 
 
 Memory management uses the LRU algorithm to better manage bitmap memory;

2. How to use DbUtils

 DbUtils db = DbUtils.create( this );
 User user = new User(); //It should be noted here that the User object must have an id attribute, or an attribute annotated with @ID  
 user.setEmail( "[email protected]" );
 user.setName( "jerehedu" );
 db.save(user); // When saving an entity using saveBindingId, the entity's id will be assigned a value   
 
 ..
 // Search  
 Parent entity = db.findById(Parent. class , parent.getId());
 List<Parent> list = db.findAll(Parent. class ); //Search by type   
 
 Parent Parent = db.findFirst(Selector.from(Parent. class ).where( "name" , "=" , "test" )); 
 
 // IS NULL  
 Parent Parent = db.findFirst(Selector.from(Parent. class ).where( "name" , "=" , null ));
 // IS NOT NULL  
 Parent Parent = db.findFirst(Selector.from(Parent. class ).where( "name" , "!=" , null )); 
 
 // WHERE id<54 AND (age>20 OR age<30) ORDER BY id LIMIT pageSize OFFSET pageOffset  
 List<Parent> list = db.findAll(Selector.from(Parent. class )
 .where( "id" , "<" , 54 )
 .and(WhereBuilder.b( "age" , ">" , 20 ).or( "age" , " < " , 30 ))
 .orderBy( "id" )
 .limit(pageSize)
 .offset(pageSize * pageIndex)); 
 
 // When op is "in", the first parameter must be an array or an implementation class of Iterable (such as List, etc.)  
 Parent test = db.findFirst(Selector.from(Parent. class ).where( "id" , "in" , new   int []{ 1 , 2 , 3 }));
 // When op is "between", the first parameter must be an array or an implementation class of Iterable (such as List, etc.)  
 Parent test = db.findFirst(Selector.from(Parent. class ).where( "id" , "between" , new String[]{ "1" , "5" })); 
 
 DbModel dbModel = db.findDbModelAll(Selector.from(Parent. class ).select( "name" )); //select("name") only takes out the name column  
 List<DbModel> dbModels = db.findDbModelAll(Selector.from(Parent. class ).groupBy( "name" ).select( "name" , "count(name)" ));
 ... 
 
 List<DbModel> dbModels = db.findDbModelAll(sql); // Custom sql query  
 db.execNonQuery(sql) // Execute custom sql  
 3. How to use HttpUtils 
 
 HttpUtils http = new HttpUtils();
 http.send(HttpRequest.HttpMethod.GET,
 "http://www.jerehedu.com" ,
 new RequestCallBack<String>(){
 @Override  
 public   void onLoading( long total, long current, boolean isUploading) {
 testTextView.setText(current + "/" + total);
 } 
 
 @Override  
 public   void onSuccess(ResponseInfo<String> responseInfo) {
 textView.setText(responseInfo.result);
 } 
 
 @Override  
 public   void onStart() {
 } 
 
 @Override  
 public   void onFailure(HttpException error, String msg) {
 }
 });