android 高级之旅 （二 ）xUtils3 基本用法
xutils功能主要有4部分：注解、网络加载、图片加载、数据库；其他的还有log输出、MD5加密等小功能
总之，xutils3是一款功能强大的框架，更多特性以及简介 移步：点击这里
一、xUtils可以直接从androidstudio中导入依赖，导入成功后需添加权限如下：
二、xutils需要在application中的oncreate方法中初始化，
在activity中：
public class MyApplication extends Application {
@Override
public void onCreate() {
super.onCreate();
x.Ext.init(this);
x.Ext.setDebug(true);
}
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
injected = true;
View view = x.view().inject(this, inflater, container);
return view;
}四大功能：
一、注解 ViewUtils模块：
与很多注解框架用法大同小异（如greendao）
@ViewInject(R.id.image1)
private ImageView image1;@Event(value = R.id.t1)
private void onBtn1ClickListener(View view) { ... }支持同时绑定多个控件id，以数组方式写入注解：
@Event(value = {R.id.t1，R.id.t2,R.id.t3})
private void onBtn1ClickListener(View view) { ... }//在Fragment中注入： @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View view = inflater.inflate(R.layout.bitmap_fragment, container, false); // 加载fragment布局 ViewUtils.inject(this, view); //注入view和事件 ... } //在PreferenceFragment中注入： public void onActivityCreated(Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); ViewUtils.inject(this, getPreferenceScreen()); //注入view和事件 ... }
二、加载图片 BitmapUtils模块
图片加载使用非常简单，只有几个非常容易理解的API，可以很轻松的实现对 图片的载入动画、 图片的缩放、旋转、圆角、圆形等处理，
@Event(value = R.id.t1)
private void onBtn1ClickListener(View view) {
//自定义的缩放动画
ScaleAnimation scaleAnimation = new ScaleAnimation(0f, 1f, 0f, 1f, Animation.RELATIVE_TO_SELF, 0.1f, Animation.RELATIVE_TO_SELF, 0.3f);
scaleAnimation.setDuration(3000);
ImageOptions imageOptions = new ImageOptions.Builder()
.setCircular(true) //是否为圆形
.setAnimation(scaleAnimation) //动画
.setSize(1000, 1500)// 设置尺寸
.setRadius(50) //设置圆角
.setAutoRotate(true) //自动旋转
.build();
x.image().bind(image1, imageUrl,imageOptions, new Callback.CacheCallback() {
@Override
public boolean onCache(Drawable result) {
return false;
}
@Override
public void onSuccess(Drawable result) {
image1.setImageDrawable(result);
}
@Override
public void onError(Throwable ex, boolean isOnCallback) {
}
@Override
public void onCancelled(CancelledException cex) {
}
@Override
public void onFinished() {
}
});
} 三、数据库 DbUtils模块
DbUtils db = DbUtils.create(this);
User user = new User(); //这里需要注意的是User对象必须有id属性，或者有通过@ID注解的属性
user.setEmail("[email protected]");
user.setName("wyouflf");
db.save(user); // 使用saveBindingId保存实体时会为实体的id赋值
...
// 查找
Parent entity = db.findById(Parent.class, parent.getId());
List list = db.findAll(Parent.class);//通过类型查找
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 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));
// op为"in"时，最后一个参数必须是数组或Iterable的实现类(例如List等)
Parent test = db.findFirst(Selector.from(Parent.class).where("id", "in", new int[]{1, 2, 3}));
// op为"between"时，最后一个参数必须是数组或Iterable的实现类(例如List等)
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")只取出name列
List dbModels = db.findDbModelAll(Selector.from(Parent.class).groupBy("name").select("name", "count(name)"));
...
List dbModels = db.findDbModelAll(sql); // 自定义sql查询
db.execNonQuery(sql) // 执行自定义sql
... 四、网络请求HttpUtils模块
@ContentView(R.layout.activity_main)
public class MainActivity extends AppCompatActivity {
@ViewInject(R.id.btn_get)
private Button btnGet;
@ViewInject(R.id.tv_test)
private TextView tvTest;
private static final String jsonPath = "http://ikft.house.qq.com/index.php?guid=866500021200250&devua=appkft_1080_1920_XiaomiMI4LTE_1.8.3_Android19&devid=866500021200250&appname=QQHouse&mod=appkft&reqnum=&pageflag=&act=newslist&channel=71&buttonmore=&cityid=1";
public final static String pathPost = "http://mrobot.pcauto.com.cn/v2/cms/channels/1?";
private Callback.Cancelable cancelable;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
x.view().inject(this);
}
//网路请求 ----get
@Event(value = R.id.btn_get,type = View.OnClickListener.class)
private void onHttpGet(View view){
// org.xutils.http.RequestParams entity, 请求参数
// org.xutils.common.Callback.CommonCallback callback 请求的回调
RequestParams requestParams = new RequestParams(jsonPath);
requestParams.setCacheDirName("httpCache"); //设置缓存路径名;
requestParams.setCacheMaxAge(1000*60*30);//设置缓存最大存活时间
requestParams.setCacheSize(1024*1024*5);//设置缓存的大小
requestParams.setConnectTimeout(3*1000);//设置连接超时
requestParams.setMaxRetryCount(3);//设置重复连接的次数\
requestParams.setPriority(Priority.BG_TOP);//设置网络优先级
requestParams.setCharset("UTF-8");//设置字符编码\
cancelable = x.http().get(requestParams, new Callback.CommonCallback() {
/*
*数据请求成功的回调
* */
@Override
public void onSuccess(String result) {
//在主线程运行
if (!TextUtils.isEmpty(result)) {
tvTest.setText(result);
}
}
/*
*数据请求错误的回调
* */
@Override
public void onError(Throwable ex, boolean isOnCallback) {
}
/*
*数据请求取消的回调
* */
@Override
public void onCancelled(CancelledException cex) {
}
/*
*数据请求完成
* */
@Override
public void onFinished() {
}
});
/* cancelable = x.http().get(requestParams, new Callback.CacheCallback() {
@Override
public boolean onCache(String result) {
return false;
}
@Override
public void onSuccess(String result) {
}
@Override
public void onError(Throwable ex, boolean isOnCallback) {
}
@Override
public void onCancelled(CancelledException cex) {
}
@Override
public void onFinished() {
}
});
*/
}
/*
*post请求
* */
@Event(value = R.id.btn_post,type = View.OnClickListener.class)
private void onHttpPost(View view){
//post测试
//post提交的字段：pageNo=1&pageSize=20&serialIds=2143,3404&v=4.0.0
// public final static String pathPost = "http://mrobot.pcauto.com.cn/v2/cms/channels/1?";
RequestParams requestParams = new RequestParams(pathPost);
//添加post请求参数
requestParams.addBodyParameter("pageNo","1");
requestParams.addBodyParameter("pageSize","20");
requestParams.addBodyParameter("serialIds","2143,3404");
requestParams.addBodyParameter("v","4.0.0");
x.http().post(requestParams, new Callback.CommonCallback() {
@Override
public void onSuccess(String result) {
tvTest.setText(result);
}
@Override
public void onError(Throwable ex, boolean isOnCallback) {
}
@Override
public void onCancelled(CancelledException cex) {
}
@Override
public void onFinished() {
}
});
}
@Override
protected void onDestroy() {
//取消请求
cancelable.cancel();
super.onDestroy();
}
}