xUtil3一共分為view、數據庫、網絡和圖片加載四個模塊。

首先下載jar，并且導入as，添加到庫

然后寫一個類集成application，并且在清單文件中配置權限等等。

public class BaseApplication extends Application {    @Override    public void onCreate() {        super.onCreate();        x.Ext.init(this);    }}
寫布局文件，幾乎全是按鈕，線性垂直分布，最后一個顯示圖片的控件。
最后上主程序代碼，各部分都有簡單示例。
public class MainActivity extends AppCompatActivity {    @ViewInject(R.id.img_icon)    ImageView imgIcon;    PRivate DbManager dbManager = null;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        ButterKnife.bind(this);//ButterKnifeioc        x.view().inject(this);//xUtils        createDB();    }    private void createDB() {        //創建數據庫        DbManager.DaoConfig config = new DbManager.DaoConfig()                .setDbName("xutils_db")                .setDbDir(Environment.getExternalStorageDirectory())                .setDbVersion(1);        dbManager = x.getDb(config);    }    @OnClick({R.id.btn_db_save, R.id.btn_db_get, R.id.btn_db_get_first, R.id.btn_db_update, R.id.btn_db_delete, R.id.btn_http_utils, R.id.btn_image})    public void onClick(View view) {        switch (view.getId()) {            case R.id.btn_db_save:                dbSave();                break;            case R.id.btn_db_get:                getAll();                break;            case R.id.btn_db_get_first:                findFirst();                break;            case R.id.btn_db_update:                update();                break;            case R.id.btn_db_delete:                delete();                break;            case R.id.btn_http_utils:                httpRequest();                break;            case R.id.btn_image:                loadImage();                break;        }    }    /**     * 加載圖片     */    private void loadImage() {        //請求地址        final String imgUrl = "http://img1.imgtn.bdimg.com/it/u=1794894692,1423685501&fm=23&gp=0.jpg";        //請求選項        ImageOptions options = new ImageOptions.Builder()                .setIgnoreGif(false)//忽略gif                .setImageScaleType(ImageView.ScaleType.CENTER_CROP)                .setLoadingDrawableId(R.mipmap.ic_launcher)//加載過程中顯示的圖片                .setFailureDrawableId(R.mipmap.ic_launcher)//加載失敗后顯示的圖片                .build();        //回調接口        Callback.CommonCallback<Drawable> callback = new Callback.CommonCallback<Drawable>() {            @Override            public void onSuccess(Drawable drawable) {            }            @Override            public void onError(Throwable throwable, boolean b) {            }            @Override            public void onCancelled(CancelledException e) {            }            @Override            public void onFinished() {            }        };        //請求加載        x.image().bind(imgIcon,imgUrl,options,callback);    }    /**     * 網絡請求     */    private void httpRequest() {        //請求參數        RequestParams params = new RequestParams("https://www.baidu.com");        //回調接口        Callback.CommonCallback<String> callback = new Callback.CommonCallback<String>() {            @Override            public void onSuccess(String s) {                Log.i("請求到的字符串", s);            }            @Override            public void onError(Throwable throwable, boolean b) {            }            @Override            public void onCancelled(CancelledException e) {            }            @Override            public void onFinished() {            }        };        x.http().get(params, callback);//發出請求    }    /**     * 刪     */    private void delete() {        try {            dbManager.delete(User.class, WhereBuilder.b("id", "=", 2));            Toast.makeText(this, "刪除成功", Toast.LENGTH_SHORT).show();        } catch (DbException e) {            e.printStackTrace();        }    }    /**     * 改     */    private void update() {        User user = new User(1, "willchan", 37);//修改id為1的數據        try {            dbManager.update(user, "name", "age");//修改name和age            Toast.makeText(this, "修改成功", Toast.LENGTH_SHORT).show();        } catch (DbException e) {            e.printStackTrace();        }    }    /**     * 查一條,按條件查     */    private void findFirst() {        try {            //User user = dbManager.findFirst(User.class);//查第一條            //帶條件            User user = dbManager.selector(User.class)                    .where("name", "=", "kalychen")                    .and("age", ">", 35)                    .findFirst();            Log.i("查詢到的第一條數據", user.toString());        } catch (DbException e) {            e.printStackTrace();        }    }    /**     * 查所有     */    private void getAll() {        try {            List<User> users = dbManager.findAll(User.class);            for (User user : users) {                Log.i("查詢到的數據", user.toString());            }        } catch (DbException e) {            e.printStackTrace();        }    }    /**     * 增     */    private void dbSave() {        //創建對象        User user = new User("kalychen", 38);        try {            //添加數據            dbManager.save(user);            Toast.makeText(this, "數據寫入成功", Toast.LENGTH_SHORT).show();        } catch (DbException e) {            e.printStackTrace();        }    }}View注入的部分很簡單演示了一下，因為我們有ButterKnife.
運行結果一切OK。