Xutils3使用全解析

初始化及注解： x.Ext. init ( this ); //是否开启log，开启后将影响性能 x.Ext. setDebug ( true ); 注解的使用： ①//绑定空间及布局文件 @ContentView (R.layout. activity_main ) public class MainActivity extends AppCompatActivity { @ViewInject (R.id. pgb ) ProgressBar bar ; @ViewInject (R.id. img_test ) ImageView imgTest ; @Override protected void onCreate(Bundle savedInstanceState) { super .onCreate(savedInstanceState); x. view ().inject( this ); } ②//绑定事件 /** * 给每个按钮设置点击事件 */ @Event (value = {R.id. btn_get , R.id. btn_post , R.id. btn_download , R.id. btn_upload , R.id. load_img , R.id. btn_db }) private void getEvent(View v) { switch (v.getId()) { case R.id. btn_get : getMethod(); break ; case R.id. btn_post : postMethod(); break ; case R.id. btn_download : download(); break ; case R.id. btn_upload : upload(); break ; case R.id. load_img : loadImage(); break ; case R.id. btn_db : useDb(); break ; } } 一：get请求： /** * get的请求方法 */ public void getMethod() { RequestParams params = new RequestParams( "https://ss0.bdstatic.com/5aV1bjqh_Q23odCf/static/superman/img/logo/bd_logo1_31bdc765.png" ); x.http().get(params, new Callback.CommonCallback<String>()......} 二：post请求： （上传表单或者上传json） /** * 使用xutils完成post请求 */ public void postMethod() { RequestParams params = new RequestParams( "https://www.baidu.com/?tn=62095104_oem_dg" ); //上传表单 params.addBodyParameter( "age" , "25" ); //上传json数据---------------------------------------------------------------------------------- JSONObject object = new JSONObject(); try { object.put( "name" , "23" ); } catch (JSONException e) { e.printStackTrace(); } params.setAsJsonContent( true ); params.setBodyContent(object.toString()); //-------------------------------------------------------------------------------------------------- x. http ().post(params, new Callback.CommonCallback<String>() {............} 三：断点续传(下载): public void download() { RequestParams params = new RequestParams( "https://github.com/XXApple/AndroidLibs.git" ); //下载文件完成放置的路径 params.setSaveFilePath(Environment. getExternalStorageDirectory () + "/me/a.zip" ); //是否自动命名 params.setAutoRename( false ); //是否断点续传 params.setAutoResume( true ); //开三个子线程进行下载，会更快 params.setExecutor( new PriorityExecutor( 3 , true )); //是否可以停止 params.setCancelFast( true ); x. http ().get(params, new Callback.ProgressCallback<File>() {........} 四：上传文件： //上传的路径 RequestParams params = new RequestParams( "xxxxxxx" ); //是否是上传文件 params.setMultipart( true ); //本地文件的路径 params.addBodyParameter( "file" , Environment. getExternalStorageDirectory () + "sdcard/a.mp4" ); x. http ().get(params, new Callback.CommonCallback<String>() {......} 五：图片加载： public void loadImage() { ImageOptions options = new ImageOptions.Builder(). setCrop( true ). setLoadingDrawableId(R.mipmap. ic_launcher ). setUseMemCache( true ). build(); x. image ().bind( imgTest , "https://ss0.bdstatic.com/5aV1bjqh_Q23odCf/static/superman/img/logo/bd_logo1_31bdc765.png" , options); } 六：数据库： 一：对象中指定表名和列名，如下 @Table (name = "person" ) public class Person { @Column (name = "id" , autoGen = true , isId = true ) private int id ; @Column (name = "age" ) private int age ; @Column (name = "name" ) private String name ; @Column (name = "price" ) private int price ; 二:初始化DbManager private DbManager.DaoConfig getConfig() { DbManager.DaoConfig config = new DbManager.DaoConfig(); //数据库的路径 config.setDbDir( new File( "sdcard/360" )). //是否允许事物 setAllowTransaction( true ). //数据库名 setDbName( "test.db" ). //数据库版本 setDbVersion( 1 ). setDbOpenListener( new DbManager.DbOpenListener() { @Override public void onDbOpened(DbManager db) { // 开启WAL, 对写入加速提升巨大 db.getDatabase().enableWriteAheadLogging(); } }).setDbUpgradeListener( new DbManager.DbUpgradeListener() { @Override public void onUpgrade(DbManager db, int oldVersion, int newVersion) { } }).setTableCreateListener( new DbManager.TableCreateListener() { @Override public void onTableCreated(DbManager db, TableEntity<?> table) { } }); return config; } 三：增 List<Person> persons = new ArrayList<>(); for ( int i = 0 ; i < 5 ; i++) { Person person = new Person(i, 20 + i, "路人" + i, 10 + i); persons.add(person); } try { db .saveBindingId(persons); } catch (DbException e) { e.printStackTrace(); } 四：删 try { //删除所有元素 db .delete(Person. class ); //删除指定ID的元素 db .deleteById(Person. class , 1 ); //删除指定元素 db .delete( new Object()); //删除特定条件的元素 WhereBuilder builder = WhereBuilder. b (); builder.and( "id" , "=" , "2" ); db .delete(Person. class , builder); } catch (DbException e) { e.printStackTrace(); } 五：改 WhereBuilder builder = WhereBuilder. b (); builder.and( "id" , "=" , "1" ); try { db .update(Person. class , builder, new KeyValue( "id" , 10 ), new KeyValue( "price" , "999999999" )); } catch (DbException e) { e.printStackTrace(); } 六：查 try { long a = db .selector(Person. class ).count(); //查个数 Log. e ( "a" , "useDb: " ); //查找所有元素 List<Person> list = db .findAll(Person. class ); Log. e ( "list" , "" + list.size()); //查找指定ID的元素 Person person1 = db .findById(Person. class , 3 ); Log. e ( "person1" , "" + person1.toString()); //按指定条件查找 List<Person> person2 = db .selector(Person. class ).where( "id" , "=" , "4" ).findAll(); Log. e ( "person2" , "" + person2.get( 0 ).toString()); } catch (DbException e) { e.printStackTrace(); }