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 classMainActivity extendsAppCompatActivity {

@ViewInject(R.id.pgb)

ProgressBarbar;

@ViewInject(R.id.img_test)

ImageViewimgTest;

@Override

protected voidonCreate(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 voidgetEvent(View v) {

switch(v.getId()) {

caseR.id.btn_get:

getMethod();

break;

caseR.id.btn_post:

postMethod();

break;

caseR.id.btn_download:

download();

break;

caseR.id.btn_upload:

upload();

break;

caseR.id.load_img:

loadImage();

break;

caseR.id.btn_db:

useDb();

break;

}

}

一：get请求：

/**

* get的请求方法

*/

public voidgetMethod() {

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 voidpostMethod() {

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 voiddownload() {

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(newPriorityExecutor(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 voidloadImage() {

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 classPerson {

@Column(name ="id", autoGen =true, isId =true)

private intid;

@Column(name ="age")

private intage;

@Column(name ="name")

privateString name;

@Column(name ="price")

private intprice;

二:初始化DbManager

privateDbManager.DaoConfig getConfig() {

DbManager.DaoConfig config =new DbManager.DaoConfig();

//数据库的路径

config.setDbDir(newFile("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(newDbManager.DbOpenListener() {

@Override

public voidonDbOpened(DbManager db) {

// 开启WAL, 对写入加速提升巨大

db.getDatabase().enableWriteAheadLogging();

}

}).setDbUpgradeListener(newDbManager.DbUpgradeListener() {

@Override

public voidonUpgrade(DbManager db, int oldVersion, intnewVersion) {

}

}).setTableCreateListener(newDbManager.TableCreateListener() {

@Override

public voidonTableCreated(DbManager db, TableEntity<?> table) {

}

});

returnconfig;

}

三：增

List<Person> persons =new ArrayList<>();

for(inti = 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(newObject());

//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, newKeyValue("id",10),new KeyValue("price","999999999"));

}catch (DbException e) {

e.printStackTrace();

}

六：查

try{

longa = 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();

}