核心逻辑在TraceClassAdapter中

private class TraceClassAdapter extends ClassVisitor {

private String className;
private boolean isABSClass = false;
private boolean isMethodBeatClass = false;
private boolean hasWindowFocusMethod = false;

TraceClassAdapter(int i, ClassVisitor classVisitor) {
super(i, classVisitor);
}

@Override
public void visit(int version, int access, String name, String signature, String superName, String[] interfaces) {
super.visit(version, access, name, signature, superName, interfaces);
this.className = name;
//是否是抽象类、接口
if ((access & Opcodes.ACC_ABSTRACT) > 0 || (access & Opcodes.ACC_INTERFACE) > 0) {
this.isABSClass = true;
}
//是否是MethodBeat类
if (mTraceConfig.isMethodBeatClass(className, mCollectedClassExtendMap)) {
isMethodBeatClass = true;
}
}

@Override
public MethodVisitor visitMethod(int access, String name, String desc,
String signature, String[] exceptions) {
//抽象类、接口不插桩
if (isABSClass) {
return super.visitMethod(access, name, desc, signature, exceptions);
} else {
if (!hasWindowFocusMethod) {
//是否是onWindowFocusChange方法
hasWindowFocusMethod = mTraceConfig.isWindowFocusChangeMethod(name, desc);
}
MethodVisitor methodVisitor = cv.visitMethod(access, name, desc, signature, exceptions);
return new TraceMethodAdapter(api, methodVisitor, access, name, desc, this.className,
hasWindowFocusMethod, isMethodBeatClass);
}
}


@Override
public void visitEnd(http://www.amjmh.com/v/BIBRGZ_558768/) {
TraceMethod traceMethod = TraceMethod.create(-1, Opcodes.ACC_PUBLIC, className,
TraceBuildConstants.MATRIX_TRACE_ON_WINDOW_FOCUS_METHOD, TraceBuildConstants.MATRIX_TRACE_ON_WINDOW_FOCUS_METHOD_ARGS);
//如果Activity的子类没有onWindowFocusChange方法，插入一个onWindowFocusChange方法
if (!hasWindowFocusMethod && mTraceConfig.isActivityOrSubClass(className, mCollectedClassExtendMap)
&& mCollectedMethodMap.containsKey(traceMethod.getMethodName())) {
insertWindowFocusChangeMethod(cv);
}
super.visitEnd();
}
}