xUtils3简介

xUtils 包含了orm, http(s), image, view注解, 但依然很轻量级(251K), 并且特性强大, 方便扩展.
官网：https://github.com/wyouflf/xUtils3

xUtils使用方法

使用前准备

第一步：引入

implementation 'org.xutils:xutils:3.8.5' 

第二步：添加权限

<uses-permission android:name="android.permission.INTERNET"/> <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/> <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> 

AndroidManifest.xml文件application 节点里添加

android:requestLegacyExternalStorage="true" android:usesCleartextTraffic="true" 

第三步：MainActivity中添加

x.Ext.init(getApplication()); x.Ext.setDebug(BuildConfig.DEBUG);// 是否输出debug日志, 开启debug会影响性能. x.view().inject(this);//没有用到view注解可以先不用 

功能1：访问网络

不带参数的网络请求

不带缓存

RequestParams params = new RequestParams("https://baidu.com"); x.http().get(params, new Callback.CommonCallback<String>() { @Override public void onSuccess(String result) { } @Override public void onError(Throwable ex, boolean isOnCallback) { } @Override public void onCancelled(CancelledException cex) { } @Override public void onFinished() { } }); 

带缓存

RequestParams params = new RequestParams("https://baidu.com"); x.http().get(params, new Callback.CacheCallback<String>() { @Override public boolean onCache(String result) { return false; } @Override public void onSuccess(String result) {         Log.i("MainActivity", result); } @Override public void onError(Throwable ex, boolean isOnCallback) {         Log.i("MainActivity", ex.getMessage()); } @Override public void onCancelled(CancelledException cex) { } @Override public void onFinished() { } }); 

带参数的请求

RequestParams params = new RequestParams("https://www.baidu.com/s"); // params.setSslSocketFactory(...); // 如果需要自定义SSL params.addQueryStringParameter("wd", "xUtils"); 

功能2：加载网络图片

ImageOptions imageOptions; imageOptions = new ImageOptions.Builder() .setSize(DensityUtil.dip2px(120), DensityUtil.dip2px(120)) .setRadius(DensityUtil.dip2px(5)) // 如果ImageView的大小不是定义为wrap_content, 不要crop. .setCrop(true) // 很多时候设置了合适的scaleType也不需要它. // 加载中或错误图片的ScaleType //.setPlaceholderScaleType(ImageView.ScaleType.MATRIX) .setImageScaleType(ImageView.ScaleType.CENTER_CROP) .setLoadingDrawableId(R.mipmap.ic_launcher) .setFailureDrawableId(R.mipmap.ic_launcher) .build(); 

// 加载网络图片 x.image().bind(imageView, url, imageOptions); // 加载本地assets目录的图片 x.image().bind(imageView, "assets://test.gif", imageOptions); // resources file x.image().bind(imageView, "res://" + R.minimap.test, imageOptions); // local file x.image().bind(imageView, new File("/sdcard/test.gif").toURI().toString(), imageOptions); x.image().bind(imageView, "/sdcard/test.gif", imageOptions); x.image().bind(imageView, "file:///sdcard/test.gif", imageOptions); x.image().bind(imageView, "file:/sdcard/test.gif", imageOptions);  x.image().bind(imageView, url, imageOptions, new Callback.CommonCallback<Drawable>() {...}); x.image().loadDrawable(url, imageOptions, new Callback.CommonCallback<Drawable>() {...}); // 用来获取缓存文件 x.image().loadFile(url, imageOptions, new Callback.CommonCallback<File>() {...}); 

功能3：框架注解

布局文件注解

//替代onCreate方法中的    setContentView(R.layout.activity_main); @ContentView(R.layout.activity_main) public class MainActivity extends AppCompatActivity { } 

控件注解

@ViewInject(R.id.textView) private TextView mTextView; 

点击事件注解

单个点击事件

/**  * 1. 方法必须私有限定,  * 2. 方法参数形式必须和type对应的Listener接口一致.  * 3. 注解参数value支持数组: value={id1, id2, id3}  * 4. 其它参数说明见{@link org.xutils.event.annotation.Event}类的说明.  **/ @Event(value = R.id.btn_test1,         type = View.OnClickListener.class/*可选参数, 默认是View.OnClickListener.class*/) private void onTest1Click(View view) { ... } 

多个点击事件

@Event(value = {R.id.button,R.id.button2},         type = View.OnClickListener.class/*可选参数, 默认是View.OnClickListener.class*/) private void onTest1Click(View view) { switch (view.getId()){ case R.id.button:             Log.i("MainActivity", "button1 click"); break; case R.id.button2:             Log.i("MainActivity", "button2 click"); break; } } 

功能4：数据库映射

下面以单表为例演示xUtils框架怎么对数据库进行增删改查操作
首先添加一个实体类，在实体类上加一个注解

package com.hnu.sqlite.db; import org.xutils.db.annotation.Column; import org.xutils.db.annotation.Table; @Table(name = "user") public class User { @Column(name = "id", isId = true) private int id; @Column(name = "username") private String username; @Column(name = "password") private String password; @Column(name = "age") private int age; public int getId() { return id; } public void setId(int id) { this.id = id; } public String getUsername() { return username; } public void setUsername(String username) { this.username = username; } public String getPassword() { return password; } public void setPassword(String password) { this.password = password; } public int getAge() { return age; } public void setAge(int age) { this.age = age; } @Override public String toString() { return "User{" + "id=" + id + ", username='" + username + ''' + ", password='" + password + ''' + ", age=" + age + '}'; } } 

在对数据库操作前，先创建DaoConfig 对象

    DbManager.DaoConfig daoConfig = new DbManager.DaoConfig() .setDbName("test.db") // 不设置dbDir时, 默认存储在app的私有目录. // .setDbDir(new File("/sdcard")) // "sdcard"的写法并非最佳实践, 这里为了简单, 先这样写了. .setDbVersion(2) .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) { // TODO: ... // db.addColumn(...); // db.dropTable(...); // ... // or // db.dropDb(); } }); 

增加数据

 DbManager db = null; try {      db = x.getDb(daoConfig);      User user = new User();      user.setUsername("test"+System.currentTimeMillis());      user.setPassword("passwd");      user.setAge(30);      db.save(user); } catch (DbException e) {      e.printStackTrace(); return; } 

删除数据

根据id 删除

DbManager db = null; try {     db = x.getDb(daoConfig);     User user = new User();     user.setId(2);     db.delete(user); } catch (DbException e) {     e.printStackTrace(); return; } 

根据条件删除

DbManager db = null; try {       db = x.getDb(daoConfig);     db.delete(User.class,             WhereBuilder.b("username", "=", "test")); } catch (DbException e) {     e.printStackTrace(); return; } 

修改数据

根据id修改

try {       DbManager db = null;      db = x.getDb(daoConfig);      User user = new User();      user.setId(1);      user.setUsername("new user");      user.setPassword("new passwd");      user.setAge(30);      db.saveOrUpdate(user); // db.update(user);或者用这个方法修改 } catch (DbException e) {      e.printStackTrace(); return; } 

根据条件修改

try {    DbManager db = null;  db = x.getDb(daoConfig);  db.update(User.class, WhereBuilder.b("username", "=", "test"), // WhereBuilder.b("id", "=", 1).and("isAdmin", "=", true)., new KeyValue("username", "test_name"), new KeyValue("password", "new pss")); } catch (DbException e) {  e.printStackTrace(); return; } 

查询数据

DbManager db = null; try {// 删除1     db = x.getDb(daoConfig);     List<User> users = new ArrayList<>();     users= db.selector(User.class).orderBy("id", true).limit(1000).where("username","=","test").findAll(); // users= db.selector(User.class).orderBy("id", true).limit(1000).findAll(); // users= db.selector(User.class).findAll(); for (User user : users){         Log.i("testdb","test" + user); } } catch (DbException e) {     e.printStackTrace(); return; }