xUtils3.0框架学习笔记

xUtils是开速开发安卓项目的开源框架，开源项目地址：https://github.com/wyouflf/xUtils3。使用起来非常方便。主要功能包括：

• xUtils 支持超大文件(超过2G)上传，更全面的http请求协议支持(11种谓词)。
• 拥有更加灵活的ORM，更多的事件注解支持且不受混淆影响。
• 图片绑定支持gif(受系统兼容性影响, 部分gif文件只能静态显示), webp; 支持圆角, 圆形, 方形等裁剪, 支持自动旋转等。
• 数据库api简化提高性能, 达到和greenDao一致的性能。
• HTTP实现替换HttpClient为UrlConnection, 自动解析回调泛型, 更安全的断点续传策略等。
  控件及事件注解绑定，方便高效HTTP请求，简单地数据库操作方式，确实是一款非常有助于我们快速开发项目的开源框架。
  参考github上面demo及相关资料，写了一个学习的demo，分别从注解，图片，HTTP及数据库四个方面进行了代码编写。
  首先是在AndroidStudio中配置项目：
  第一步：
  在AndroidStudio项目的build.gradle文件中添加compile ‘org.xutils:xutils:3.3.36’：

dependencies {
    compile fileTree(dir: ‘libs‘, include: [‘*.jar‘])
    testCompile ‘junit:junit:4.12‘
    compile ‘com.android.support:appcompat-v7:23.4.0‘
    compile ‘org.xutils:xutils:3.3.36‘
}

添加好后build下工程即可 。
第二步：
在AndroidManifest.xml中添加对应权限：

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

第三步：在项目中自定义Application，初始化xUtils3.0。

/**
 * description：
 * 作者：ldm
 * 时间：20162016/6/22 09:03
 * 邮箱：1786911211@qq.com
 */
public class BaseApplication extends Application {
    @Override
    public void onCreate() {
        super.onCreate();
        x.Ext.init(this);//在自定义的Application中初始化XUtils3.0
    }
}

记得把我们定义的Application配置到AndroidManifest.xml中。
接下来就可以作用xUtils3.0进行快速开发了。

—– 第一部分：注解示例—–

/**
 * description：xUtils3.0框架注解功能
 * 作者：ldm
 * 时间：20162016/6/22 09:17
 * 邮箱：1786911211@qq.com
 */
@ContentView(R.layout.activity_annotation)
public class AnnotationActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        x.view().inject(this);
        FragmentManager fragmentManager = getFragmentManager();
        FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
        TestFragment fragment = new TestFragment();
        fragmentTransaction.add(R.id.fra_layout, fragment);
        fragmentTransaction.commit();
    }
}

—–注解功能对应地Fragment—–

/**
 * description：xUtils3.0框架注解之：Fragment中注解使用
 * 作者：ldm
 * 时间：20162016/6/22 09:28
 * 邮箱：1786911211@qq.com
 */
@ContentView(R.layout.frag_test)//给Fragment绑定布局文件
public class TestFragment extends Fragment {
    @ViewInject(R.id.test_listview)
    private ListView listView;
    private List<ListBean> datas;

    public TestFragment() {
        super();
    }

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        return x.view().inject(this, inflater, container);//调用x.view().inject()方法返回view
    }

    //onCreateView是创建的时候调用,onViewCreated是在onCreateView后被触发的事件
    @Override
    public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);
        constructDatas();
        listView.setAdapter(new TestAdapter(getActivity(), datas));
    }

    private void constructDatas() {
        datas = new ArrayList<>();
        for (int i = 0; i < 15; i++) {
            ListBean bean = new ListBean("这是第" + i + "个标题", "这里都是相同的内容");
            datas.add(bean);
        }
    }

    //ListView的item点击事件注解操作
    @Event(type = AdapterView.OnItemClickListener.class, value = R.id.test_listview)
    private void onItemClick(AdapterView<?> parent, View view, int position, long id) {
        Toast.makeText(getActivity(), "点击了第" + position + "个item", Toast.LENGTH_LONG).show();
    }

    //长按事件注解操作
    @Event(type = AdapterView.OnItemLongClickListener.class, value = R.id.test_listview)
    private boolean onLongItemClick(AdapterView<?> parent, View view, int position, long id) {
        Toast.makeText(getActivity(), "长按第" + position + "个item", Toast.LENGTH_LONG).show();
        return true;
    }
}

—–第二部分：图片加载示例—–

/**
 * description：xUtils3.0框架图片功能
 * 作者：ldm
 * 时间：20162016/6/22 09:17
 * 邮箱：1786911211@qq.com
 */
@ContentView(R.layout.activity_image)
public class ImageActivity extends Activity {
    @ViewInject(R.id.image_01)
    private ImageView image_01;
    @ViewInject(R.id.image_02)
    private ImageView image_02;
    @ViewInject(R.id.image_03)
    private ImageView image_03;
    @ViewInject(R.id.image_04)
    private ImageView image_04;
    private String url_01 = "";
    private String url_02 = "";
    private String url_03 = "";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        x.view().inject(this);//需要添加这句代码，否则不会关联到布局
    }

    //加载网络图片第一种方法
    @Event(value = R.id.image_01)
    private void loadImageMethodOne(View v) {
        //直接调用 bind(ImageView view, String url)方法，传入对应控件及url即可
        x.image().bind(image_01, url_01);
    }

    //加载网络图片第二种方法
    @Event(value = R.id.image_02)
    private void loadImageMethodTwo(View v) {
        //创建图片参数设置类ImageOptions
        ImageOptions options = new ImageOptions.Builder().build();
        //直接调用bind(ImageView view, String url, ImageOptions options)方法，传入对应参数
        x.image().bind(image_02, url_02, options);
    }

    //加载网络图片第三种方法
    @Event(value = R.id.image_03)
    private void loadImageMethodThree(View v) {
        //调用bind(ImageView view, String url, Callback.CommonCallback<Drawable> callback)
        x.image().bind(image_03, url_03, new Callback.CacheCallback<Drawable>() {
            @Override
            public boolean onCache(Drawable result) {//可以在这里设置图片保存等操作
                return false;
            }

            @Override
            public void onSuccess(Drawable result) {//获取成功

            }

            @Override
            public void onError(Throwable ex, boolean isOnCallback) {//获取失败

            }

            @Override
            public void onCancelled(CancelledException cex) {//取消操作

            }

            @Override
            public void onFinished() {//完成操作

            }
        });
    }

    //加载本地图片
    @Event(value = R.id.image_04)
    private void loadImageMethodFour(View v) {
        ImageOptions options = new ImageOptions.Builder().
                setImageScaleType(ImageView.ScaleType.FIT_CENTER).
                setUseMemCache(true).
                build();//可以设置options各项参数
        // assets下的图片
        // x.image().bind(image_04, "assets://test.png", options);
        // SD卡下图片
        //   x.image().bind(image_04, new File("/sdcard/test.png").toURI().toString(), options);
        x.image().bind(image_04, "/sdcard/test.gif", options);
    }
}

—–第三部分：HTTP请求—–

/**
 * description：xUtils框架之Http请求
 * 作者：ldm
 * 时间：20162016/6/22 09:17
 * 邮箱：1786911211@qq.com
 */
@ContentView(R.layout.activity_http)
public class HttpActivity extends Activity {
    @ViewInject(R.id.get)
    private Button get;
    @ViewInject(R.id.post)
    private Button post;
    @ViewInject(R.id.upload)
    private Button upLoad;
    @ViewInject(R.id.download)
    private Button downLoad;
    private static final String TAG = "HttpActivity";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        x.view().inject(this);
    }

    //HTTP请求之GET请求
    @Event(type = View.OnClickListener.class, value = R.id.get)
    private void httpGetOnClick(View v) {
        String url = "http://www.baidu.com";
        final ProgressDialog dia = new ProgressDialog(this);
        dia.setMessage("加载中....");
        dia.show();
        RequestParams params = new RequestParams(url);
        x.http().get(params, new Callback.CommonCallback<String>() {
            @Override
            public void onSuccess(String result) {
                //加载成功回调，返回获取到的数据
                Log.i(TAG, "onSuccess: " + result);
            }

            @Override
            public void onFinished() {
                dia.dismiss();//加载完成
            }

            @Override
            public void onCancelled(CancelledException cex) {

            }

            @Override
            public void onError(Throwable ex, boolean isOnCallback) {

            }
        });
    }

    //HTTP请求之POST请求
    @Event(type = View.OnClickListener.class, value = R.id.post)
    private void httpPostOnClick(View v) {
        String url = "this is request url for post";
        final ProgressDialog dia = new ProgressDialog(this);
        dia.setMessage("加载中....");
        dia.show();
        RequestParams params = new RequestParams(url);
        params.addParameter("userName", "admin");//添加Post请求参数,如果是get请求，会直接添加到url后面
        params.addBodyParameter("passWord", "123456");
        params.addHeader("head", "给Head添加信息");//addHeader添加Head信息
        x.http().post(params, new Callback.CommonCallback<String>() {
            @Override
            public void onSuccess(String result) {
                //加载成功回调，返回获取到的数据
                Log.i(TAG, "onSuccess: " + result);
            }

            @Override
            public void onFinished() {
                dia.dismiss();//加载完成
            }

            @Override
            public void onCancelled(CancelledException cex) {

            }

            @Override
            public void onError(Throwable ex, boolean isOnCallback) {

            }
        });
    }

    //HTTP请求之文件上传
    @Event(type = View.OnClickListener.class, value = R.id.upload)
    private void upLoadOnClick(View v) {
        String upUrl = "/mnt/sdcard/pic/test.jpg";//指定要上传的文件
        final ProgressDialog dia = new ProgressDialog(this);
        dia.setMessage("加载中....");
        dia.show();
        RequestParams params = new RequestParams(upUrl);
        params.addBodyParameter("file", new File(upUrl));
        x.http().post(params, new Callback.CommonCallback<String>() {
            @Override
            public void onSuccess(String result) {
                //加载成功回调，返回获取到的数据
                Log.i(TAG, "onSuccess: " + result);
            }

            @Override
            public void onFinished() {
                dia.dismiss();//加载完成
            }

            @Override
            public void onCancelled(CancelledException cex) {

            }

            @Override
            public void onError(Throwable ex, boolean isOnCallback) {

            }
        });
    }

    //HTTP请求之文件下载
    @Event(type = View.OnClickListener.class, value = R.id.download)
    private void downLoadOnClick(View v) {
        String downUrl = "please input download url";
        final ProgressDialog dia = new ProgressDialog(this);
        dia.setMessage("加载中....");
        dia.show();
        RequestParams params = new RequestParams(downUrl);
        x.http().post(params, new Callback.CommonCallback<File>() {
            @Override
            public void onSuccess(File result) {
                //下载成功
                Intent in = new Intent(Intent.ACTION_VIEW);
                in.setDataAndType(Uri.fromFile(result), "application/vnd.android.package-archive");//比如我们下载的apk文件，直接安装
                startActivity(in);
            }

            @Override
            public void onFinished() {
                dia.dismiss();
            }

            @Override
            public void onCancelled(CancelledException cex) {

            }

            @Override
            public void onError(Throwable ex, boolean isOnCallback) {

            }
        });
    }
}

—-第四部分：数据库操作——

/**
 * description：xUtils3.0框架数据库操作
 * 作者：ldm
 * 时间：20162016/6/22 09:17
 * 邮箱：1786911211@qq.com
 */

@ContentView(R.layout.activity_db)
public class DatabaseActivity extends Activity {
    @ViewInject(R.id.create)
    private Button create;
    @ViewInject(R.id.add)
    private Button add;
    @ViewInject(R.id.delete)
    private Button delete;
    @ViewInject(R.id.query)
    private Button query;
    @ViewInject(R.id.update)
    private Button update;
    @ViewInject(R.id.del_db)
    private Button del_db;
    private DbManager.DaoConfig daoConfig;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        x.view().inject(this);
    }

    private void initDataBase() {
        daoConfig = new DbManager.DaoConfig()
                .setDbName("test.db")//数据库名称
                // 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)//设置版本号
                .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() {//数据库升级
                    @Override
                    public void onUpgrade(DbManager db, int oldVersion, int newVersion) {
                        // TODO: ...
                        // db.addColumn(...);
                        // db.dropTable(...);
                        // ...
                        // or
                        // db.dropDb();
                    }
                });
    }

    //创建数据库及表格
    @Event(value = R.id.create)
    private void createOnClick(View v) throws Exception {
        initDataBase();
        DbManager db = x.getDb(daoConfig);
        Teacher t = new Teacher("张三", 28, "English", 1);
        db.save(t);//调用这句话，则可以创建表格，并把数据存入
    }

    //添加数据
    @Event(value = R.id.add)
    private void addOnClick(View v) throws Exception {
        DbManager db = x.getDb(daoConfig);
        Teacher t = new Teacher("李四", 38, "Math", 3);
        db.save(t);//如果表格存在，并把数据存入
        List<Teacher> list = new ArrayList<>();
        list.add(new Teacher("王五", 30, "Engilsh", 2));
        list.add(new Teacher("赵六", 40, "Chinese", 3));
        list.add(new Teacher("陈七", 50, "Math", 4));
        db.save(list);//可以这样保存多条数据到指定表格
    }

    //删除数据
    @Event(value = R.id.delete)
    private void deleteOnClick(View v) throws Exception {
        DbManager db = x.getDb(daoConfig);
        WhereBuilder wb = WhereBuilder.b();
        wb.and("level", "=", 1);
        db.delete(Teacher.class, wb);//删除等级为1的教师
    }

    //修改数据
    @Event(value = R.id.update)
    private void updateOnClick(View v) throws Exception {
        DbManager db = x.getDb(daoConfig);
        db.update(Teacher.class, WhereBuilder.b().and("name", "=", "王五"), new KeyValue("name", "朱八"));//把王五的名字改成朱八
    }

    //查询数据
    @Event(value = R.id.query)
    private void queryOnClick(View v) throws Exception {
        DbManager db = x.getDb(daoConfig);
        WhereBuilder wb = WhereBuilder.b();
        wb.and("level", "=", 2);
        List<Teacher> list = db.selector(Teacher.class).findAll();//查询所有数据
        List<Teacher> list1 = db.selector(Teacher.class).where(wb).findAll();//查询等级数2的教师
    }

    //删除数据库或表格
    @Event(value = R.id.del_db)
    private void delDBOnClick(View v) throws Exception {
        DbManager db = x.getDb(daoConfig);
        db.dropDb();//删除数据库
        db.dropTable(Teacher.class);//删除teacher表格
    }


}

由于时间关系，代码写得比较粗糙，后期使用中再细化。Demo下载地址：http://download.csdn.net/detail/true100/9556471