根目錄下新建一個類繼承application，調用xUtils3初始化方法
public class AtguiguApplication extends Application {
    @Override
    public void onCreate() {
        super.onCreate();
        //xUtils3初始化
        x.Ext.init(this);
        // 是否輸出debug日誌, 開啟debug會影響性能.
        x.Ext.setDebug(true);
    }
}

manifest配置application name
  
 
<application
        android:name=".AtguiguApplication"

@ContentView(R.layout.activity_xutils3_main)
public class XUtils3MainActivity extends Activity {


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

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        
 
super.onCreate(savedInstanceState);
//        setContentView(R.layout.activity_xutils3_main);
//        x.view().inject(XUtils3MainActivity.this);
        x.view().inject(this);

        //設置標題
        textView.setText("xUtils3的使用");
    }


    @Event(value = {R.id.btn_annotation,R.id.btn_net,R.id.btn_image,R.id.btn_image_list})
    
 
private void getEvent(View view){
        switch (view.getId()){
            case R.id.btn_annotation:
//                Toast.makeText(XUtils3MainActivity.this, "註解模塊被點擊了", Toast.LENGTH_SHORT).show();
                Intent intent = new Intent(XUtils3MainActivity.this, FragmentXUtils3Activity.class);
                startActivity(intent);
                break;
            case R.id.btn_net:
                Toast.makeText(XUtils3MainActivity.this, "網絡模塊被點擊了", Toast.LENGTH_SHORT).show();
                break;
            case R.id.btn_image:
                Toast.makeText(XUtils3MainActivity.this, "加載單張圖片被點擊了", Toast.LENGTH_SHORT).show();
                break;
            case R.id.btn_image_list:
                Toast.makeText(XUtils3MainActivity.this, "加載列表圖片被點擊了", Toast.LENGTH_SHORT).show();
                break;
        }



    }

}

@ContentView(R.layout.activity_xutils3_fragment)
public class FragmentXUtils3Activity extends FragmentActivity {

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

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
//        setContentView(R.layout.activity_xutils3_fragment);
        x.view().inject(this);

        textView.setText("在Fragment中使用註解");

        //1.得到FragmentManger
        FragmentManager fm = getSupportFragmentManager();
        //2.開啟事務
        FragmentTransaction tt = fm.beginTransaction();
        //3.替換Fragment
        tt.replace(R.id.fl_content,new DemoFragment());
        //4.提交
        tt.commit();
    }
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".xutils3.annotation.FragmentXUtils3Activity">

    <!--標題欄-->
    <include layout="@layout/titlebar" />

    <FrameLayout
        android:id="@+id/fl_content"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>

</LinearLayout>

@ContentView(R.layout.fragment_demo)
public class DemoFragment extends Fragment {

    @ViewInject(R.id.btn_fragment)
    private Button button;

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

    /**
     * 上下文
     */
    private Context context;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        context =getContext();
    }

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

    @Override
    public void onActivityCreated(@Nullable Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);

        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Toast.makeText(context, "我是按鈕，我在fragment中初始化，並且被點擊了", Toast.LENGTH_SHORT).show();
            }
        });
        textView.setText("我在fragment中初始化了");
    }
}

@ContentView(R.layout.fragment_demo)
public class DemoFragment extends Fragment {

    @ViewInject(R.id.btn_fragment)
    private Button button;

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

    /**
     * 上下文
     */
    private Context context;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        context =getContext();
    }

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

    @Override
    public void onActivityCreated(@Nullable Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);

        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Toast.makeText(context, "我是按鈕，我在fragment中初始化，並且被點擊了", Toast.LENGTH_SHORT).show();
            }
        });
        textView.setText("我在fragment中初始化了");
    }
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <Button
        android:textAllCaps="false"
        android:id="@+id/btn_fragment"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="fragment的按鈕" />

    <TextView
        android:id="@+id/tv_text"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="text" />

</LinearLayout>

xutils3基本使用