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super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

getFragmentManager().beginTransaction().replace(R.id.fragment, new BlankFragment()).commit();

}

}

织入后的代码

public class MainActivity extends AppCompatActivity {

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

this.setContentView(R.layout.activity_main);

FragmentTransaction transaction = this.getFragmentManager().beginTransaction();

BlankFragment fragment = new BlankFragment();

int containerViewId = R.id.fragment;

FragmentInjector.beforeCallFragmentReplace(transaction, containerViewId, fragment);

transaction.replace(containerViewId, fragment).commit();

}

}

@AfterCall

方法调用后织入代码，同上@BeforeCall这里不在累述

@BeforeSuperExecute

父类方法内部执行前织入代码，如果是子类没有重写父类方法的话，将强制实现该方法，且该方法只有只会在直接子类中只会织入一次，子类的子类不在织入，防止多次调用。

@Aspect

public class FragmentInjector {

private static final String TAG = “FragmentInjector”;

@BeforeSuperExecute(clazz = Fragment.class, method = “onCreate”)

public static void beforeFragmentCreate(Fragment fragment, Bundle savedInstanceState) {

Log.e(TAG, "beforeFragmentCreate: fragment = " + fragment + ", savedInstanceState = " + savedInstanceState);

}

@AfterSuperExecute(clazz = Fragment.class, method = “onResume”)

@AfterSuperExecute(clazz = DialogFragment.class, method = “onResume”)

@AfterSuperExecute(clazz = ListFragment.class, method = “onResume”)

public static void afterFragmentResume(Fragment fragment) {

Log.e(TAG, "afterFragmentResume: fragment = " + fragment);

}

}

织入前的代码

public class BlankFragment extends Fragment {

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

}

}

织入后的代码

public class BlankFragment extend

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s Fragment {

@Override

public void onCreate(Bundle savedInstanceState) {

FragmentInjector.beforeFragmentCreate(this, savedInstanceState);

super.onCreate(savedInstanceState);

}

@Override

public void onResume() {

super.onResume();

FragmentInjector.afterFragmentResume(this);

}

}

@BeforeSuperExecute同样适用于interface，如下，且能适配Lambda表达式

@Aspect

public class ClickListenerInjector {

private static final String TAG = “ClickListenerInjector”;

@BeforeSuperExecute(clazz = View.OnClickListener.class, method = “onClick”)

public static void beforeViewOnClick(View.OnClickListener listener, View view) {

Log.e(TAG, "beforeViewOnClick: listener = " + listener + ", view = " + view);

}

}

@AfterSuperExecute

父类方法内部执行后织入代码，同上@BeforeSuperExecute这里不在累述

注解方法定义

这里有朋友可能观察到了注解下面方法定义的规则

1. 方法必须是 public static

2. 第一个参数是切点的this对象，后面的参数分别的切点方法的参数

3. 除this参数外后面的参数类型是严格匹配，顺序和类型必须和切点方法保持一致

butcherknife 集成

在project根目录的build.gradle添加插件

buildscript {

repositories {

mavenLocal()

google()

jcenter()

}

dependencies {

classpath ‘com.android.tools.build:gradle:x.x.x’

classpath “com.littersun.butcherknife:butcherknife-gradle-plugin:1.0.0”

}

}

然后在APP module的build.gradle应用插件

apply plugin: ‘com.littersun.butcherknife’

在需要的module中添加注解的依赖