0 引入包

根目錄下的build.gradle中阅酪，dependencies添加以下兩個依賴，很多網(wǎng)上文章說只需依賴第一個察绷，運(yùn)行時候會報錯：

  classpath 'com.hujiang.aspectjx:gradle-android-plugin-aspectjx:1.1.0'
  classpath 'org.aspectj:aspectjtools:1.8.14'

然后再主項目或者庫的build.gradle中增加AspectJ的依賴：

compile 'org.aspectj:aspectjrt:1.8.14'

同時在build.gradle中加入AspectJX模塊：

apply plugin: 'android-aspectjx'

1 定義切面類

TestAnnoAspect

@Aspect
public class TestAnnoAspect {
    private static final String TAG = "jack";

    @Before("execution(* com.jack.aop.MainActivity.onCreate(..))")
    public void onActivityMethodBefore(JoinPoint joinPoint) throws Throwable {
        String key = joinPoint.getSignature().toString();
        Log.d(TAG, "onActivityMethodBefore: " + key);
    }

    @After("execution(* android.app.Activity.onResume(..))")
    public void onActivityMethodafter(JoinPoint joinPoint) throws Throwable {
        String key = joinPoint.getSignature().toString();
        Log.d(TAG, "onActivityMethodafter: " + key);
    }
}

在類的最開始干签，我們使用@Aspect注解來定義這樣一個AspectJ文件，編譯器在編譯的時候拆撼，就會自動去解析容劳，并不需要主動去調(diào)用AspectJ類里面的代碼。

MainActivity

public class MainActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }
}

經(jīng)過編譯后：MainActivity.class

public class MainActivity
  extends AppCompatActivity
{
  private static final JoinPoint.StaticPart ajc$tjp_0;
    private static final JoinPoint.StaticPart ajc$tjp_1;

    private static void ajc$preClinit()
    {
        Factory localFactory = new Factory("MainActivity.java", MainActivity.class);
        ajc$tjp_0 = localFactory.makeSJP("method-execution",
                localFactory.makeMethodSig("4", "onCreate", "com.jack.aop.MainActivity",
                        "android.os.Bundle", "savedInstanceState", "", "void"), 11);
        ajc$tjp_1 = localFactory.makeSJP("method-execution", 
                localFactory.makeMethodSig("4", "onResume", "com.jack.aop.MainActivity", 
                        "", "", "", "void"), 18);
    }

    protected void onCreate(Bundle savedInstanceState)
    {
        Bundle localBundle = savedInstanceState;
        JoinPoint localJoinPoint = Factory.makeJP(ajc$tjp_0, this, this, localBundle);
        TestAnnoAspect.aspectOf().onActivityMethodBefore(localJoinPoint);
        super.onCreate(savedInstanceState);
        setContentView(2131296283);
    }

    protected void onResume()
    {
        JoinPoint localJoinPoint = Factory.makeJP(ajc$tjp_1, this, this);
        try
        {
            super.onResume();
        }
        catch (Throwable localThrowable)
        {
            TestAnnoAspect.aspectOf().onActivityMethodafter(localJoinPoint);throw localThrowable;
        }
        TestAnnoAspect.aspectOf().onActivityMethodafter(localJoinPoint);
    }

    static {}
}

可以看到在onCreate和onResume中插入了代碼闸度。

完畢